Datasheet AS431 Datasheet (Silicon Link)

Page 1

AS431

DESCRIPTION

The AS431 is a three-terminal adjustable shunt regulator providing a highly accurate bandgap reference. The adjustable shunt regulator is ideal for a wide variety of linear applications that can be implemented using external components to obtain adjustable currents and voltages.

In the standard shunt configuration, the combination of low temperature coefficient (TC), sharp turn-on characteristics, low output impedance and programmable output voltage make this precision reference a perfect zener diode replacement.

The AS431 precision adjustable shunt reference is offered in four bandgap tolerances: ±0.25%, ±0.5%, ±1.0% and ±2.0%.

FEATURES

♦ Temperature-compensated: 30 ppm/°C ♦ Trimmed bandgap reference ♦ Internal amplifier with 150 mA capability ♦ Multiple temperature ranges ♦ Low frequency dynamic output impedance: < 150 m ♦ Low output noise ♦ Robust ESD protection ♦ Available in Lead Free (RoHS Compliant) version.

PIN CONFIGURATION – Top View

SOT-89

Reference 2 Anode 3 Cathode

3L SOT-23/

Anode

3L SOT-23/

Anode

Reference

Cathode

Anode

Cathode

8L SOIC

Cathode

Anode

Note: Top marking for 1.0% 431 is A431 (applies to SOT-89, TO-92 and SO IC packages). Refer to Silicon Link Device Marking Guidelines.

PACKAGE TOP MARKING: (For SOT-89)

AS431 YMXXXS

5L SOT-23

Anode

Reference

Anode

Line 1: Device Line 2: Lot No. Code YMXXX – 5 Character Lot No. mark excluding 1 character of lot no. S – Split Code

Reference

†

Cathode

TO-92

1 2 3

Anode

Reference

Precision Adjustable Shunt Reference

letter

PACKAGE TOP MARKING: (For 3L/5L SOT-23)

Line 1: # BBB

# BBB

PACKAGE TOP MAR (For both TO-92 & 8L SOIC)

FYMXXXS GYYWW

Cathode

# – Device Number (single letter code) BBB –Sequential Number

Note:

1. # is based on Silicon Link Device Marking Guidelines (refer to SLI form no. FM-40217)

2. BBB is based on Silicon Link Logbook Code

ING:

S431

Line 1: Device Line 2: Lot No. Code F – Foundry Code (S) YMXXX – 5 Character Lot No. S – Split Code Line 3: Date Code G – Assembly Vendor Code YY – Year WW – Workweek

Silicon Link Inc. 1 September 2013 Rev. 8 www.silicon-link.com

Page 2

AS431

(

ORDERING INFORMATION

AS431 B R5 D8 13

Circuit Type:

Precision Adjustable Shunt Reference

Temperature Range:

A = 0°C to 70°C B = 0°C to 125°C C = -40°C to +85°C D = -40°C to +125°C

Bandgap Tolerance:

2 = ±2% V 1 = ±1% V R5 = ±0.5% V R25 = ±0.25% V R5W = ±0.5% W

FUNCTIONAL BLOCK DIAGRAM

ABSOLUTE MAXIMUM RATINGS

Parameter Symbol Rating Units

Cathode-Anode Reverse Breakdown VKA 37 V Anode-Cathode Forward Current IAK 1 A Operating Cathode Current IKA 150 mA Reference Input Current I Continuous Power Dissipation at 25°C PD TO-92 775 mW 8L SOIC 750 mW SOT-89 1000 mW SOT-23/3L 200 mW SOT-23/5L 200 mW Junction Temperature TJ 150 °C Storage Temperature T

Lead Temperature, Soldering 10 Seconds TL 300 °C Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.

Silicon Link Inc. 2 September 2013 Rev. 8 www.silicon-link.com

Precision Adjustable Shunt Reference

Packaging Option:

A = Ammo Pack B = Bulk T = Tube 7 = Tape and Reel (7” Reel Dia) 13 = Tape and Reel

Package Style:

LP = TO-92 S = SOT-89 VS = SOT-23/3L (Standard Pin) VF = SOT-23/3L (Reverse Pin) DBV = SOT-23/5L D8 = SOIC/8L

10 mA

REF

-65 to 150 °C

STG

13” Reel Dia)

Page 3

AS431

RECOMMENDED CONDITIONS TYPICAL THERMAL RESISTANCES

Parameter Symbol Rating Unit

Cathode Voltage VKA V

Cathode Current IK 10 mA

to 20 V

REF

ELECTRICAL CHARACTERISTICS

Electrical Characteristics are guaranteed over full junction temperature range (0 to 125°C). Ambient temperature must be derated based on power dissipation and package thermal characteristics. The conditions are: V unless otherwise noted.

Parameter Symbol Test Condition

Reference Voltage V

V

with Temp* TC 0.07 0.20 0.07 0.20

REF

Ratio of Change in V

to Cathode Voltage

Reference Input Current I

Temp Deviation I

REF

Min IK for Regulation I

Off State Leakage I

Dynamic Output

Impedance

REF

V

REF

K(min)

K(off)

TA = 25°C

REF

Over Temp. 2.475 2.530 2.496 2.536 V 1

to 10V

REF

36V to 10V

0.7 4 0.7 4 µA 2

Over Temp. 0.4 1.2 0.4 1.2 µA 2

REF

0.4 1 0.4 1 mA 1

= 0V,

REF

= 36V

F  1 kHz

= 1 to 150mA

Parameter Symbol Test Condition

TA = 25°C

Reference Voltage V

REF

Over Temp.

V

with Temp* TC 0.07 0.20 0.07 0.20

REF

Ratio of Change in V

to Cathode Voltage

REF

Reference Input Current I

Temp Deviation I

REF

Min IK for Regulation I

Off State Leakage I

Dynamic Output

Impedance

to 10V

V

REF

K(min)

K(off)

REF

10V to 36V

0.7 4 0.7 4 µA 2

Over Temp. 0.4 1.2 0.4 1.2 µA 2

0.4 1 0.4 1 mA 1

= 0V,

REF

= 36V

F  1 kHz I

= 1 to 150mA

*Calculating Average Temperature Coefficient (TC). Refer to following page.

Silicon Link Inc. 3 September 2013 Rev. 8 www.silicon-link.com

Precision Adjustable Shunt Reference

Package θJA θJC Typical Derating

TO-92 160°C/W 80°C/W 6.3 mW/°C

SOIC 175°C/W 45°C/W 5.7 mW/°C

SOT-89 110°C/W 8°C/W 9.1 mW/°C

SOT-23/3L 575°C/W 150°C/W 1.7 mW/°C

SOT-23/5L 575°C/W 150°C/W 1.7 mw/°C

= VREF and IK = 10 mA

AS431 (0.25%) AS431 (0.5%)

MIN TYP MAX MIN TYP MAX

UNIT

2.496 2.503 2.509 2.490 2.503 2.515 V 1

mV/

-1.0 -2.7 -1.0 -2.7

-0.4 -2.0 -0.4 -2.0

mV/V 2

0.04 250 0.04 250 nA 3

0.15 0.5 0.15 0.5  1

AS431 (1.0%) / (2.0%) AS431 (0.5%) W

MIN TYP MAX MIN TYP MAX

2.470 2.495 2.520

2.440 2.490 2.550

2.449 2.541

2.430 2.569

2.510 2.522 2.535 V 1

2.488 2.556 V 1

UNIT

mV/

-1.0 -2.7

-0.4 -2.0

-1.0 -2.7

-0.4 -2.0

mV/V 2

0.04 250 0.04 250 nA 3

0.15 0.5 0.15 0.5  1

°C

TEST

CUIRCUIT

TEST

CUIRCUIT

Page 4

AVERAGE TEMPERATURE COEFFICIENT

TEST CIRCUITS

AS431

Precision Adjustable Shunt Reference

Silicon Link Inc. 4 September 2013 Rev. 8 www.silicon-link.com

Page 5

TYPICAL PERFORMANCE CURVES

AS431

Precision Adjustable Shunt Reference

Silicon Link Inc. 5 September 2013 Rev. 8 www.silicon-link.com

Page 6

TYPICAL PERFORMANCE CURVES

AS431

Precision Adjustable Shunt Reference

Silicon Link Inc. 6 September 2013 Rev. 8 www.silicon-link.com

Page 7

AS431

TYPICAL PERFORMANCE CURVES

Silicon Link Inc. 7 September 2013 Rev. 8 www.silicon-link.com

Precision Adjustable Shunt Reference

Page 8

AS431

TYPICAL PERFORMANCE CURVES

Silicon Link Inc. 8 September 2013 Rev. 8 www.silicon-link.com

Precision Adjustable Shunt Reference

Page 9

AS431

APPLICATION INFORMATION

The AS431 is a low-cost Precision Temperature Compensated Reference IC that is well-suited for many applications in linear and power electronics. A direct replacement for the industry standard TL431, this IC offers improved AC performance, near zero Temperature Coefficient (TC), trimmed 0.5% tolerance and is available in standard grades from 0 to 105°C and an extended temperature version, the AS1431, from -55 to 125°C.

When used with a minimum of external components, this device is ideal for a wide variety of applications including precision programmable voltage references, high speed amplifiers, comparators, linear series or shunt regulators, current sources or limiters, delay timers, voltage monitors, alarm circuits, and oscillators.

This application note demonstrates the versatility of the AS431 in typical applications and presents data useful for gaining a complete understanding of its application.

Figure 1 shows the schematic symbol and functional block diagram for the AS431. As indicated by the schematic symbol, the device can be thought of as a programmable zener diode. The functional block diagram, however, reveals a versatile IC consisting of a trimmed 2.5V precision band gap reference, a high speed amplifier (Gain BW Product  3 MHz), ESD protection and a low impedance output stage. It is capable of shunting from 1 to 150 milliamps and has an output voltage range of 2.5 to 30 volts.

Silicon Link Inc. 9 September 2013 Rev. 8 www.silicon-link.com

Figure 1. AS431 A) Schematic Symbol

B) Functional Block Diagram

Precision Adjustable Shunt Reference

TYPICAL APPLICATIONS

Precision Voltage Reference

The most common application of the AS431 is a precision temperature compensated voltage reference as shown in Figure 2. Note that only one external resistor is required for an output voltage equal to V than V

Fixed 2.5 Volt Reference

For an output voltage equal to V is connected directly to the cathode. A single resistor R is used to set the cathode current (I depend primarily on V impedance that the circuit output will see (similar to selecting the series resistor for an ordinary zener diode). Generally, R should be chosen to give about 10 mA of cathode current. This will keep the power dissipation low.

Example: Determine the value of R for V

The voltage across R is 20 – 2.5 = 17.5 V. For a desired I of 10mA, R = 17.5/0.01 = 1.75 k. Thus, an R of 1.8 k will give an I

Programmable Output

To program the output of desired value between V 30 volts, a simple resistor voltage divider is used as shown in Figure 2B.

Figure 2. AS431 Precision Voltage Reference

, a simple resistor divider network is used.

REF

and the characteristics of the load

of about 10 mA.

A) Fixed B) Programmable

. For output voltages other

REF

, the reference input pin

REF

). The value of R will

= 20 volts.

REF

and

Page 10

AS431

is determined by the formula:

Silicon Link Inc. 10 September 2013 Rev. 8 www.silicon-link.com

OUT

= V

OUT

To ensure precise regulation, low TC precision 1% resistors should be used for R1 & R2. Its values should not be so low as to cause excessive power dissipation, nor too high that an error is introduced due to changes in I temperature (I over the full temperature range). A good compromise is to always keep R2 at around 2 to 5 k and then select R1 to obtain the desired output voltage. The circuit can be made variable by using a potentiometer for R1.

The AS431 As An Error Amplifier

The AS431 can be used in both linear and switch mode power supplies as high gain error amplifier with a built-in temperature compensated voltage reference.

Linear Voltage Regulator

Figure 3 shows a simple linear voltage regulator. This circuit converts an unregulated DC source (rectified AC or battery) to a low-noise, low-ripple precision-regulated DC output. The output voltage can be set to any desired value between 2.5 to 28 volts, and the out- put current is limited only by the series pass element.

The high gain of the AS431 allows this circuit to achieve a line/load regulation of typically 0.03% or better, depending on the application.

Switch Mode Power Supply

The AS431 can be similarly used in switch mode power supplies as shown Figure 4. The only difference is the AS431 does not control the output voltage directly as in the linear regulator.

Figure 3. Linear Regulator Using the AS431 as a

(1 + R1/R2) + I

REF

is typically 0.7 µA and deviates 0.4 µA

REF

Reference/ Error Amplifier

REF

 R1.

Precision Adjustable Shunt Reference

Instead, it provides an amplified error signal to the PWM circuitry that in turn controls the on/off ratio of the switching device(s), thereby regulating the output voltage. Also, because of the phase shifts and delays associated with the modulator and filter components in switching power supplies, a more elaborate compensation network is required in the control loop to optimize the gain/phase characteristics of system. The network type and values are chosen so as to ensure stability and proper transient response.

Note that there are many different types of switching power supply topologies having different compensation, isolation and PWM configurations. The AS431 and associated circuitry, however, are essentially the same in all cases except for component values, the type of compensation network used and location (it may be located on the primary side in some applications).

The AS431 may also be used for other functions in a switch mode power supply. For example, it can be used as a reference or a comparator in the housekeeping, input/output monitoring, temperature control, or alarm circuitry. Or, as the reference/error amplifier in a MagAmp or linear auxiliary output regulator. Figure 6 illustrates several of these applications.

Frequency Compensation

Frequency compensation of a power supply control loop is achieved with an external compensation network, typically connected between the reference and cathode pins of the AS431. The type of network used can be as simple as a single capacitor, or as elaborate as a dual zero-pole pair network, depending on the power supply’s topology. A typical single zero-pole pair compensation network is shown in Figures 4 and 5.

The AS431 typically has 55 dB of gain from DC to 6 kHz, where it rolls off at a 6 dB per octave rate, reaching 0 dB at 3 MHz. Further information characterizing the performance of the AS431 over frequency can be found in the AS431 Data Sheet. Due to the complexity of frequency compensation network design and the vast number of power supply topologies possible, a detailed discussion is beyond the scope of this application note. However, the information provided is useful in determining the compensation needed for a particular application.

The AS431 as a MagAmp Controller

Post regulation is required in many cases for one or more outputs of a switch-mode power supply. Linear regulators incorporating the AS431 are adequate for most low current outputs. When high current outputs are required, a MagAmp (saturable-core) regulator is usually used because of its high efficiency.

REF

over

Page 11

AS431

Generally speaking, a MagAmp is a pulse-width modulated buck regulator circuit that uses a saturable core inductor as the switching element. The inductor initially has a high inductance that blocks a predetermined number of volt-seconds. Upon saturation, the induction reverts to a very low impedance, which allows current to flow to the output with little loss. The number of volt-seconds blocked in each cycle is defined by the control circuitry and varies in accordance with changes in line and load, providing tight regulation at the output.

The AS431 is an ideal low-cost MagAmp controller, for it contains all the necessary control functions needed (precision reference, high gain error amplifier and an output stage) in a small package.

Silicon Link Inc. 11 September 2013 Rev. 8 www.silicon-link.com

Figure 4. A Switch-Mode Power Supply Using the AS431 as a Reference/ Error Amplifier

Figure 5. An AS431 Controlled MagAmp Post Regulator

Precision Adjustable Shunt Reference

A schematic diagram of a typical MagAmp post regulator using the AS431 is shown in Figure 5. Since this circuit constitutes a closed loop system, frequency compensation of the error amplifier is necessary.

Other Applications

The AS431 also can replace an ordinary zener diode in any circuit where a higher accuracy and temperature stability is required. Viewing the AS431 as a high gain transistor with a V possibilities. Applications for this device are limited only by the imagination.

Several practical applications are illustrated in Figure 6.

of 2.5 V increases usage

Page 12

AS431

SECONDARY SIDE ERROR AMPLIFIER USING THE AS431

I. Introduction

One of the most important safety regulations to which an off-line power supply must conform is input to output electrical isolation. This isolation requirement prevents the power supply control IC from directly sensing both the input line and output voltages. In the case of primary side control the output regulation information, an error voltage, must be transferred from the secondary side. This application note discusses a simple way of transmitting regulation information across the electrical isolation using an AS431 and a conventional 4N27 opto-coupler.

Silicon Link Inc. 12 September 2013 Rev. 8 www.silicon-link.com

Figure 6. Typical AS431 Applications

Precision Adjustable Shunt Reference

II. Power Supply Circuit

Figure 1 illustrates a simple flyback regulator. The AS3842, a low-cost current mode control IC, is configured to regulate the power supply from the primary side. The AS431 acts as a reference and a feedback error amplifier to sense the output voltage and generate a corresponding error voltage. This error voltage is then converted to an error current and coupled to the primary side through a 4N27 optocoupler.

Page 13

AS431

III. Opto-Coupler

Recently, opto-coupler manufacturers have made major improvements in opto-coupler processing and packaging technologies, resulting in tighter current transfer ratio (CTR) tolerances and better long-term reliability.

When designing the opto-coupler feedback circuitry, the designer should note the opto-coupler forward diode current. The forward diode current sets the device’s CTR and effects the long-term reliability of the device. Similar to a lamp filament, the opto-coupler diode can be worn out or degraded more quickly if it is subjected to higher current.

IV. Design Example

Figure 2 shows the amplifier feedback section of the flyback power supply. To keep the 5V output regulated, the V output voltage is first divided down by two 2.5 k resistors, and its result is fed into an AS431 error amplifier network. The error amplifier output, V is then converted to a proportional opto-coupler diode current. The opto-coupler bridges the isolation barrier and generates an output collector current proportional to the input diode current. Since the opto-coupler output is connected to the V current is the I operating condition, a higher output voltage causes V

CATHODE

COMP

A lower V therefore decreases the regulator output voltage. The result is a regulated output. A determination of the optocoupler diode operating current and small signal loop gain follows.

voltage must track the output voltage. The

COMP

pin, the opto-coupler output

COMP

source current. In a normal

COMP

to drop and results in a high diode current and

source current and consequently a lower V

decreases the PWM duty cycle and

COMP

Silicon Link Inc. 13 September 2013 Rev. 8 www.silicon-link.com

Figure 1. A 40W Flyback Power Regulator

CATHODE

COMP

Precision Adjustable Shunt Reference

Also, the opto-coupler’s unity gain bandwidth increases with forward diode current. The modulation of the gain bandwidth is caused by variations in the transconductance of the output transistor. In addition, the Miller capacitor from the base to collector of the output transistor damps out the effects of the optocoupler’s gain variance. A properly designed optocoupler circuit not only increases long-term reliability of the regulator but also ensures a superior loop response.

IVa. Opto-Coupler Operating Current

This design example shows the diode operating current as determined by the maximum I order for V I

source current, I

COMP

region slightly above the maximum I

current. The linear is depicted in Figure 3.

Since the I coupler output current, the opto-coupler output current also modulates in the same I known opto-coupler output current, the input diode current, I current versus diode current curve on the opto-coupler data sheet. Figure 4 illustrates the output current versus diode current curve of the 4N27 opto-coupler.

The 4N27 data sheet guarantees a minimum of 0.1 CTR at 10 mA diode current.

The typical AS3842 maximum I 800 µA. Using Figure 4, and assuming 0.1 CTR at 10 mA diode current, the forward diode current required to generate 800 µA of opto-coupler current is 8 mA.

to decrease linearly with increasing

COMP

source current is equal to the opto-

COMP

, can then be obtained from the output

DIODE

has to operate in a linear

COMP

source current. In

COMP

linear region. With a

COMP

source current is

COMP

source

Page 14

AS431

Silicon Link Inc. 14 September 2013 Rev. 8 www.silicon-link.com

Figure 3. V

Precision Adjustable Shunt Reference

Figure 2.

COMP

VS I

COMP

Page 15

IVb. AC Gain Analysis

Once the opto-coupler diode current is determined, the current limiting resistor R1 of Figure 2 can ten be chosen to guarantee good output regulations and proper dynamic loop response. The AS431 cathode voltage, V I

DIODE

greater than 2.5V for proper operation.

= 5.0V – 1.2V – (8 mA · R1) > 2.5V = 3.8 – (8 mA · R1) > 2.5V R1 < 162  = 82  (chosen)

R1 also plays a significant role in controlling the open loop gain of the power supply. The following equations derive the small signal AC gain from V

COMP

(V = • CTR R1

∆ I = ∆V

At the steady state condition, V region,

∆ v

∆V

From figure 3:

∆v R

= 509 kΩ

Applying equation (4):

∆ v = • (509 kΩ) ∆ V

= 620 = 55.9 dB

is a function of the diode operating current,

CATHODE

, and the value of R1. Also, V

= VO – VD – (I

= 3.14 V

· R1) > 2.5V (1)

CATHODE

= ID • CTR (2)

– VK)

CTR (3)

COMP

is in the linear

COMP

∆ I

COMP

= •

K ∆VK

CTR = • R R1

COMP =

∆ I

5.6 V

COMP

∆ V

COMP

∆ I

COMP

(822 – 810) µA

0.1

COMP

82 Ω

must be

to V

COMP

(4)

AS431

Precision Adjustable Shunt Reference

IVc. Other Considerations

R2, a 2 k resistor in parallel with the opto-coupler diode and R1, provides the minimum cathode current required to keep the AS431 operating when a minimum opto-coupler diode current is required. In addition, a small filter capacitor is placed close to the V the control IC to attenuate high frequency switching noise being picked up by the metal trace from the optocoupler to the control IC. Since the location of the pole in the opto-coupler small signal response varies significantly with the dc operating point of the optocoupler, a resistor can be added from the V pin to supply additional bias current to stabilize the loop.

REG

COMP

to V

pin of

COMP

Silicon Link Inc. 15 September 2013 Rev. 8 www.silicon-link.com

Page 16

AS431

TO-92 PACKAGE DIMENSION

3-Lead TO-92 Plastic Package

SLI Package Code: LP

Silicon Link Inc. 16 September 2013 Rev. 8 www.silicon-link.com

SYMBOL

A 0.176 0.180 0.184

b 0.015 0.018 0.022 c 0.014 0.015 0.020

øD 0.176 0.180 0.184

e 0.098 0.100 0.102

e1 0.048 0.050 0.052

E 0.136 0.140 0.144

j 0.166 0.170 0.174

L 0.530 0.550 0.570

S1 0.031 0.035 0.039

NOTES:

1. ALL DIMENSIONS IN INCHES.

2. A MECHANICAL TOLERANCE OF ±0.002” APPLIES TO ALL DIMENSIONS WHERE NO TOLERANCE IS EXPLICITLY GIVEN.

3. BASED FROM JEDEC T0-226 VARIATION AA OUTLINE.

Precision Adjustable Shunt Reference

INCHES

MIN NOM MAX

Page 17

AS431

SOT-89 PACKAGE DIMENSION

3-Lead SOT-89 Plastic

Surface Mounted Package

SLI Package Code: S

NOTES:

1. TOP PACKAGE ANGLE IS 9° +1°/-2° TOLERANCE. BOTTOM PACKAGE ANGLE IS 3° MAX.

2. PACKAGE CORNER RADIUS IS 5 MILS MAX ON ALL CORNERS.

3. SHINNY PACKAGE FINISH ON ALL SIDES EXCEPT TOP SIDE FINISH IS MINIMUM MATTE OF 10-14VDI.

Silicon Link Inc. 17 September 2013 Rev. 8 www.silicon-link.com

Precision Adjustable Shunt Reference

INCHES

SYM MIN NOM

A 0.055 0.063 B 0.017 0.022

B1 0.014 0.019

C 0.014 0.017 D 0.173 0.181

D1 0.066 0.070

E 0.090 0.099

E1 0.084 0.086

e 0.059

e1 0.118

H 0.155 0.167 L 0.029 0.041

NOTE: ALL DIMENSION ARE IN INCHES

Page 18

3L-SOT23 PACKAGE DIMENSION

3-Lead SOT-23Plastic Surface Mounted Package SLI Package Code: VS/ VF

AS431

Precision Adjustable Shunt Reference

Silicon Link Inc. 18 September 2013 Rev. 8 www.silicon-link.com

Page 19

AS431

5L-SOT23 PACKAGE DIMENSION

5-Lead SOT23 Plastic

Surface Mounted Package

SLI Package Code: DBV

8L-SOIC PACKAGE DIMENSION

8-Lead SOIC Plastic

Surface Mounted Package

SLI Package Code: D8

Silicon Link Inc. 19 September 2013 Rev. 8 www.silicon-link.com

Precision Adjustable Shunt Reference

DIMENSION IN INCHES DIMENSION IN MM

SYM MIN NOM MAX MIN NOM MAX

A 0.045 0.049 0.053 1.14 1.24 1.35

A1 0.002 0.004 0.006 0.05 0.10 0.15

A2 0.043 0.045 0.047 1.09 1.14 1.19

b 0.012 0.014 0.016 0.30 0.35 0.40

c 0.003 0.006 0.009 0.08 0.15 0.22

D 0.113 0.115 0.117 2.87 2.92 2.97

E1 0.061 0.064 0.066 1.55 1.63 1.68

E 0.105 0.110 0.115 2.67 2.79 2.92

e 0.037 0.95

e1 0.075 1.90

L 0.014 0.016 0.018 0.35 0.40 0.45

L1 0.021 0.023 0.025 0.53 0.58 0.64

Ø 0* - 8* 0* - 8*

NOTE:

1. DIMENSION D DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. DIMENSION E1 DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.

NOTES:

1. DIMENSION D DOES NOT INCLUDE MOLD FLASH,

2. COPLANARITY APPLIES TO THE TERMINALS.

3. BASED FROM JEDEC NS-012 VARIATION AA.

DIMENSION IN

SYM MIN NOM MAX MIN NOM MAX

A 0.059 0.062 0.065 1.50 1.57 1.65

A1 0.004 0.008 0.010 0.10 0.20 0.25

A2 0.051 0.054 0.057 1.30 1.37 1.45

b 0.013 0.016 0.020 0.33 0.41 0.51

c 0.007 0.008 0.010 0.18 0.20 0.25

D 0.191 0.193 0.195 4.85 4.90 4.95

E1 0.151 0.153 0.155 3.84 3.89 3.94

E 0.228 0.234 0.240 5.79 5.94 6.10 e 0.050 1.27

L 0.020 0.024 0.032 0.51 0.61 0.81

L1 0.039 0.041 0.043 0.99 1.04 1.09

Ø 0* - B* 0* - B*

h 0.011 0.015 0.019 0.28 0.38 0.48

PROTRUSIONS OR GATE BURRS. DIMENSION E1 DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.

COPLANARITY SHALL NOT EXCEED 0.003” [0.08 mm].

INCHES

DIMENSION IN MM

Page 20

Precision Adjustable Shunt Reference

TO-92 AMMO PACK SPECIFICATIONS

SYMBOL DESCRIPTION

D Feed Hole Diameter 4.0 0.157 3.8 0.150 4.2 0.165

T1 (POD) Component Lead Thickness 0.405 0.016 0.36 0.014 0.45 0.018

F1/F2 Lead Pitch (Left / Right) 2.54 0.100 2.4 0.094 2.8 0.110

C Bottom of Component to Seating Plane 2.50 0.098 1.50 0.059 4.00 0.157

W1 Edge to Sprocket Hole Center 9.0 0.354 8.50 0.335 9.50 0.374 H2A Deflection (Left or Right) 0.50 0.020 0 0 0.50 0.020 H2B Deflection (Front or Rear) 1.0 0.039 0 0 1.0 0.039

H2 (H + C) Feed Hole to Bottom of Component 18.5 0.728 17.00 0.669 20.50 0.087

H Height of Seating Plane 16 0.630 15.5 0.610 16.5 0.650

H3 Feed Hole Center to Overall Transistor Height 27.75 1.092 23.5 0.925 32.0 1.260

L Defective Unit Clipped Dimension - - - - 11.0 0.433

L1 Leadwire Enclosure 2.50 0.098 2.50 0.098 - -

P Feed Hole Pitch 12.7 0.500 12.40 0.488 13.0 0.512

P2 Center of Feed Hole to Center Lead 6.35 0.250 6.0 0.234 6.75 0.266

P3 (P2-F1) First Lead Spacing Dimension 3.75 0.148 3.6 0.142 3.95 0.156

P1 Center Lead to Center Lead 12.7 0.500 12.2 0.500 13.2 0.520

t1 Adhesive Tape Thickness 0.18 0.007 0.16 0.006 0.20 0.008

T (t+t1+T1) Overall Taped Package Thickness - - - - 1.55 0.061

T Carrier Strip Thickness 0.37 0.015 0.27 0.011 0.47 0.018

W Carrier Strip Width (18mm) 18.00 0.709 17.5 0.689 19.0 0.748 W3 Adhesive Tape Width (6mm) 6.00 0.236 5.5 0.217 6.3 0.248 W2 Adhesive Tape Position 0.25 0.010 0 0 0.50 0.020

VALUE

mm inch mm inch mm inch

TOLERANCES NOMINAL

min max

TO-92 Ammo Pack Requirement

Components

TO92 3L 18 2000

Tape Width

(W) mm

Fan Fold Box

AS431

Silicon Link Inc. 20 September 2013 Rev. 8 www.silicon-link.com

Page 21

AS431

PACKAGE MECHANICAL DRAWING

Surface Mountable Tape & Reel Specifications in mm (inch)

(SOIC, SOT-23 and SOT-89)

- - - - - - - - - - - - - - - - - - - -

User direction of feed

Tape Size

(W)

8, 12, 16,

24mm

D E P0 T (Max) A0, B0, K0

1.55±0.05

(.061±.002)

1.75±0.10

(.069±.004)

(.157±.004)

Tape

Size (W)

8 mm

12 mm

Max.

4.2

(.165)

8.2

(.323)

Min.

1.0

(.039)

1.5

(.059)

3.5±0.05

(.138±.002)

5.5±0.05

(.217±.002)

Per Package Requirement

Components

SOIC 8L 12 8 - 2500

SOT-23 3L 8 4 3000 -

SOT-23 5L 8 4 3000 -

SOT-89 3L 12 8 - 2500

Tape Width

(W) mm

Note: Ao Bo Ko are determined by component size. The clearance between the component and the cavity must be within 0.05 [.002] min. to 0.50 [.020] max. for 8mm tape, 0.05 [.002] min to 0.65 [.026] max for 12mm tape.

Precision Adjustable Shunt Reference

4.0±0.10

0.400 (.016)

Max.

2.4

(.094)

4.5

(.177)

Cavity Pitch

(P) mm

(Max)

See Note

2.0±.05

.079±.002

Devices per Reel

7” Reel 13” Reel

0.100

(.004)

Variable

Dimensions

Constant

Dimensions

Silicon Link Inc. 21 September 2013 Rev. 8 www.silicon-link.com

Page 22

AS431

Precision Adjustable Shunt Reference

REEL DIMENSIONS

Tape Size

8mm

12mm

Max. B Min.

330

(12.992)

330

(12.992)

(.059)

1.5

13.0±0.20

(.152±.008)

13.0±0.20

(.152±.008)

Min.

20.2

(.795)

20.2

(.795)

Min.

(1.973)

8.4±1.5

0.0

(.331±.059)

0.0

12.4±2.0

0.0

(.488±.078)

0.0

Max.

14.4

(.567)

14.4

(.567)

MECHANICAL POLARIZATION

SOIC-8L DEVICE

User direction of feed - - - - - - - - - - - - - - - - - - - -

User direction of feed

SOT-89 DEVICE

- - - - - - - - - - - - - - - - - - - -

Silicon Link Inc. 22 September 2013 Rev. 8 www.silicon-link.com

Page 23

AS431

SOT-23 3L DEVICE

User direction of feed

SOT-23 5L DEVICE

User direction of feed

Precision Adjustable Shunt Reference

- - - - - - - - - - - - - - - - - - - -

Silicon Link Inc. 23 September 2013 Rev. 8 www.silicon-link.com

Page 24