Diodes AZ431A User Manual

AZ431-A

Document number: DS36721 Rev. 4 – 2

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AZ431-A

A Product Line of

Diodes Incorporated

Description

The AZ431-A is a three-terminal adjustable shunt regulator with
guaranteed thermal stability over a full operation range. It features
sharp turn-on characteristics, low temperature coefficient and low
output impedance, which make it ideal substitute for Zener diode in
applications such as switching power supply, charger and other
adjustable regulators.

The output voltage of AZ431-A can be set to any value between V

REF

(2.5V) and the corresponding maximum cathode voltage (36V).

The AZ431-A precision reference is offered in two voltage tolerance:

0.4% and 0.8%.

This IC is available in 4 packages: TO92 (bulk or ammo packing),
SOT23, SOT25 and SOT89.

Applications

 Charger
 Voltage Adapter
 Switching Power Supply
 Graphic Card
 Precision Voltage Reference

Features

 Programmable Precise Output Voltage from 2.5V to 36V
 High Stability under Capacitive Load
 Low Temperature Deviation: 4.5mV Typical
 Low Equivalent Full-range Temperature Coefficient with

20PPM/oC Typical

 Sink Current Capacity from 1mA to 100mA
 Low Output Noise
 Wide Operating Range of -40 to +125oC
 Lead-Free Packages: TO92, SOT23, SOT25, SOT89

 Totally Lead-Free; RoHS Compliant (Notes 1 & 2)

 Lead-Free Packages, Available in “Green” Molding Compound:

TO92, SOT23, SOT25, SOT89

 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)

3

2

1

ANODE

REF CATHODE

1

2

3

REF

ANODE

CATHODE

1

2

3

REF

ANODE

CATHODE

ADJUSTABLE PRECISION SHUNT REGULATORS

Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.

Pin Assignments

(Top View) (Top View) (Top View)

(SOT23/ N Package) (SOT89 Option 1/ R Package) (SOT89 Option 2/ R Package)

AZ431-A

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1

2

3 4

5

REF

ANODENC

*

CATHODE

(Note 4)

1

2

3

ANODE

REF

CATHODE

1

2

3

CATHODE

ANODE

REF

Pin Assignments (Cont.)

(SOT25/ K Package) (TO92 (Bulk Packing)/ Z Package) (TO92 (Ammo Packing)/ Z Package)

Note: 4. * Pin 2 is attached to substrate and must be connected to ANODE or open.

(Top View) (Top View) (Top View)

Typical Applications Circuit

Shunt Regulator

High Current Shunt Regulator

AZ431-A

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Typical Applications Circuit (Cont.)

Current Source or Current Limit

Precision 5V 1A Regulator

PWM Converter with Reference

AZ431-A

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AZ431-A

A Product Line of

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Symbol

Parameter

Rating

Unit

VKA

Cathode Voltage

40

V

IKA

Cathode Current Range (Continuous)

-100 to 150

mA

I

REF

Reference Input Current Range

10

mA

PD

Power Dissipation

Z, R Package: 770

mW

N, K Package: 370

TJ

Junction Temperature

+150

ºC

T

STG

Storage Temperature Range

-65 to +150

ºC

ESD

ESD (Human Body Model)

2000

V

Symbol

Parameter

Min

Max

Unit

VKA

Cathode Voltage

V

REF

36

V

IKA

Cathode Current

1.0

100

mA

TA

Operating Ambient Temperature Range

-40

+125

ºC

Functional Block Diagram

Absolute Maximum Ratings (Note 5)

Note: 5. Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.

Recommended Operating Conditions

AZ431-A

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Symbol

Test

Circuit

Parameter

Conditions

Min

Typ

Max

Unit

V

REF

4

Reference Voltage

0.4%

V

KA

= V

REF

, I

KA

= 10mA

2.490

2.500

2.510

V

0.8%

2.480

2.500

2.520

V

REF

4

Deviation of Reference Voltage
Over Full Temperature Range

V

KA

= V

REF

I

KA

= 10mA

0 to +70oC

–

4.5

8

mV

-40 to +85oC

–

4.5

10

-40 to +125oC

–

4.5

16

V

REF

VKA

5

Ratio of Change in Reference
Voltage to the Change in
Cathode Voltage

I

KA

= 10mA

V

KA

=

10V to V

REF

–

-1.0

-2.7

mV/V

V

KA

=

36V to 10V

–

-0.5

-2.0

I

REF

5

Reference Current

I

KA

= 10mA, R1 = 10KΩ, R2 =

∞

–

0.7 4 µA

I

REF

5

Deviation of Reference Current
Over Full Temperature Range

I

KA

= 10mA, R1 = 10KΩ

R2 = ∞, TA = -40 to +125oC

–

0.4

1.2

µA

IKA

(Min)

4

Minimum Cathode Current for
Regulation

V

KA

= V

REF

–

0.4

1.0

mA

IKA

(Off)

6

Off-state Cathode Current

V

KA

= 36V, V

REF

= 0

–

0.05

1.0

µA

ZKA

4

Dynamic Impedance

V

KA

= V

REF

, I

KA

= 1 to 100mA,

f ≤ 1.0KHz

–

0.15

0.5

Ω

θ

JC

–

Thermal Resistance

SOT23

–

135.48

–

o

C/W

–

SOT25

–

135.48 – –

TO92

–

81.63 – –

SOT89

–

29.80

–

Electrical Characteristics (@T

= +25°C, unless otherwise specified.)

A

AZ431-A

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Electrical Characteristics (Cont.)

Test Circuit 4 for V

= V

KA

REF

Test Circuit 5 for V

KA

> V

REF

Test Circuit 6 for I

OFF

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-60 -40 -20 0 20 40 60 80 100 120 140

2.485

2.490

2.495

2.500

2.505

2.510

Reference Voltage (V)

Ambient Temperature (oC)

VKA = V

REF

IKA = 10mA

-60 -40 -20 0 20 40 60 80 100 120 140

0.0

0.5

1.0

1.5
R1=10K,R2=Infinite

IKA=10mA

Reference Current (

A)

Ambient Temperature (0C)

-2 -1 0 1 2 3

-100

-50

0

50

100

150

Cathode Current (mA)

Cathode Voltage (V)

VKA=V

REF

TA=250C

-1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5

-200

0

200

400

600

800

Cathode Current (

A)

Cathode Voltage (V)

VKA=V

REF

TA=250C

-40 -20 0 20 40 60 80 100 120

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

Off-State Cathode Current (

A)

Ambient Temperature (oC)

VKA=36V
V

REF

=0

-40 -20 0 20 40 60 80 100 120

-1.4

-1.3

-1.2

-1.1

-1.0

-0.9

VKA=3.5V to 36V

V

REF

/ V

KA

(mV/V)

Ambient Temperature (oC)

Performance Characteristics

Reference Voltage vs. Ambient Temperature Reference Current vs. Ambient Temperature

Cathode Current vs. Cathode Voltage Cathode Current vs. Cathode Voltage

Off-State Cathode Current vs. Ambient Temperature Ratio of Delta Reference Voltage to the

Ratio of Delta Cathode Voltage

AZ431-A

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1k 10k 100k 1M

-10

0

10

20

30

40

50

60

70

Voltage Gain (dB)

Small Signal Frequency (Hz)

TA=250C
IKA=10mA

1K 10K 100K 1,000K

0.1

1

10

Reference Impedance (

)

Frequency (Hz)

IKA=10mA
TA=25oC

1E-3 0.01 0.1 1 10 100

0

10

20

30

40

50

60

70

80

90

100

VKA=V

REF

VKA= 5V
VKA=10V

VKA=15V: No Oscillation

Stable

Stable

Cathode Current (mA)

Load Capacitance (F)

Performance Characteristics (Cont.)

Small Signal Voltage Gain vs. Frequency

Reference Impedance vs. Frequency

Stability Boundary Conditions vs. Load Capacitance

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0 2 4 6

0

1

2

3

4

5

Input

Input and Output Voltage (V)

Time (S)

Output

Performance Characteristics (Cont.)

Pulse Response of Input and Output Voltage

AZ431-A

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AZ431 X X- X XX XX

Packing

Package

TR : Tape & Reel

N : SOT23
K : SOT25

Product Name

E1/G1

Blank : Bulk

E1 : Lead Free
G1 : Green

R : SOT89
Z : TO92

Voltage Tolerance

A: 40V

Cathode Voltage

A : 0.4%
B : 0.8%

or Ammo

Package

Temperature

Range

Voltage

Tolerance

Part Number

Marking ID

Packing
Lead- Free

Green

Lead-Free

Green

SOT23

-40 to +125C

0.4%

AZ431AN­ATRE1

AZ431AN­ATRG1

EA1

GA1

3000/

Tape & Reel

0.8%

AZ431BN­ATRE1

AZ431BN­ATRG1

EA2

GA2

3000/

Tape & Reel

SOT25

-40 to +125C

0.4%

AZ431AK­ATRE1

AZ431AK­ATRG1

E3A

G3A

3000/

Tape & Reel

0.8%

AZ431BK­ATRE1

AZ431BK­ATRG1

E3B

G3B

3000/

Tape & Reel

TO92

-40 to +125C

0.4%

AZ431AZ-AE1

AZ431AZ-AG1

AZ431AZ-AE1

AZ431AZ-AG1

1000/

Bulk

0.4%

AZ431AZ­ATRE1

AZ431AZ­ATRG1

AZ431AZ-AE1

AZ431AZ-AG1

2000/

Ammo

0.8%

AZ431BZ-AE1

AZ431BZ-AG1

AZ431BZ-AE1

AZ431BZ-AG1

1000/

Bulk

0.8%

AZ431BZ­ATRE1

AZ431BZ­ATRG1

AZ431BZ-AE1

AZ431BZ-AG1

2000/

Ammo

SOT89

-40 to +125C

0.4%

AZ431AR­ATRE1

AZ431AR­ATRG1

E43A

G43A

1000/

Tape & Reel

0.8%

AZ431BR­ATRE1

AZ431BR­ATRG1

E43B

G43B

1000/

Tape & Reel

Pb

Lead-Free

Pb

Lead-Free

Pb

Lead-Free

Pb

Lead-Free

Ordering Information

Diodes IC's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
Products with "G1" suffix are available in green packages.

AZ431-A

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3

XXXXX
XZ-XX1
YWWAXX

XXX

: Logo

XXX: Marking ID
(See Ordering Information)

First and Second Line: Logo and Marking ID
(See Ordering Information)
Third Line: Date Code
Y: Year
WW: Work Week of Molding
A: Assembly House Code
XX: 7th and 8th Digits of Batch Number.

Marking Information

(1) TO92

(2) SOT23

(Top View)

(Top View)

AZ431-A

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XXXX

: Logo

XXXX: Marking ID
(See Ordering Information)

XXX

: Logo

XXX: Marking ID
(See Ordering Information)

Marking Information (Cont.)

(3) SOT25

(4) SOT89

(Top View)

(Top View)

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2.420(0.095)

2.660(0.105)

0.360(0.014)

0.760(0.030)

Φ

1.600(0.063)
MAX

12.500(0.492)

15.500(0.610)

1.270(0.050)
TYP

3.300(0.130)

3.700(0.146)

4.300(0.169)

4.700(0.185)

1.000(0.039)

1.400(0.055)

4.400(0.173)

4.800(0.189)

3.430(0.135)
MIN

0.320(0.013)

0.510(0.020)

0.000(0.000)

0.380(0.015)

Package Outline Dimensions

(1) Package Type: TO92 (Bulk Packing)

AZ431-A

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4.300(0.169)

4.700(0.185)

1

2.500(0.492)14.500(0.571)

2.540(0.100

)

Ty

p

1.270(0.050

)

Typ

0.

(0.015)

0.

550

(0.022

)

4.400(0.173
)

4.

800

(

0.

189

)

3.430(0.135

)

MIN

0.320(0.013

)

0

.510(0.020

)

0.000(0.000

)

0.380(0.015

)

MAX

1.100(0.043

1.400(0.055

)

3.300(0.130)

3.800(0.150)

Φ

1.600(0.063)

)

380

2.500(0.098
)

4.

000

(

0.

157

)

13.000(0.512
)

15.

000

(

0.

591

)

Package Outline Dimensions (Cont.)

(2) Package Type: TO92 (Ammo Packing)

AZ431-A

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2.300(0.091)

2.500(0.098)

1.200(0.047)

1.400(0.055)

0.890(0.035)

1.030(0.041)

0.300(0.012)

0.510(0.020)

1.900(0.075)REF

2.800(0.110)

3.000(0.118)

2.0°

3.0°

0.500(0.020)

0.700(0.028)

1.050(0.041)REF

0.010(0.0004)

0.100(0.004)

0.900(0.035)

1.100(0.043)

4×

R0.100(0.004)

7.0°

7.0°

0.550(0.022)REF

0.200(0.008)MIN

0.100(0.004) GAUGE PLANE

0.080(0.003)

0.180(0.007)

R0.100(0.004)

0.0°~10.0°

Package Outline Dimensions (Cont.)

(3) Package Type: SOT23

AZ431-A

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2.820(0.111)

2.650(0.104)

1

.

500

(

0

.

059

)

0

.

000

(

0

.

000

)

0.300(0.012)

0.950(0.037)

0

.

900

(

0

.

035

)

0.100(0.004)

0.200(0.008)

0

.

300

(

0

.

012

)

8°

0°

3.100(0.122)

1

.

700

(

0

.

067

)

3

.

000

(

0

.

118

)

0.500(0.020)

0

.

150

(

0

.

006

)

1

.300(

0.051

)

0.200(0.008)

0

.

600

(

0

.

024

)

1.800(0.071)

2.000(0.079)

0

.

700

(

0

.

028

)

REF

TYP

1

.

450

(

0

.

057

)

MAX

Package Outline Dimensions (Cont.)

(4) Package Type: SOT25

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45

1.550(0.061)REF

4.400(0.173)

4.600(0.181)

0.900(0.035)

1.200(0.047)

3.950(0.156)

4.250(0.167)

3.000(0.118)
TYP

0.480(0.019)

2.300(0.091)

2.600(0.102)

0.320(0.013)

0.540(0.021)

3

10

2.060(0.081)REF

1.400(0.055)

1.600(0.063)

0.350(0.014)

0.450(0.018)

R0.150(0.006)

3

10

1.500(0.059)

0.320(0.013)REF

1.620(0.064)REF

2.210(0.087)REF

0.320(0.013)

0.540(0.021)

1.800(0.071)

Option 1 Option 2

0.620(0.024)

1.030(0.041)REF

R 0.200(0.008)

1.620(0.064)

1.830(0.072)

2.630(0.104)

2.930(0.115)

Option 1

Package Outline Dimensions (Cont.)

(5) Package Type: SOT89

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Y

G

Z

Y

X E

Grid placement courtyard

Dimensions

Z

(mm)/(inch)

G

(mm)/(inch)

X

(mm)/(inch)

Y

(mm)/(inch)

E

(mm)/(inch)

Value

2.900/0.114

1.100/0.043

0.800/0.031

0.900/0.035

0.950/0.037

Suggested Pad Layout

(1) Package Type: SOT23

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E2

E1

Y

X

G

Z

Dimensions

Z

(mm)/(inch)

G

(mm)/(inch)

X

(mm)/(inch)

Y

(mm)/(inch)

E1

(mm)/(inch)

E2

(mm)/(inch)

Value

3.600/0.142

1.600/0.063

0.700/0.028

1.000/0.039

0.950/0.037

1.900/0.075

Suggested Pad Layout (Cont.)

(2) Package Type: SOT25

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X1

X2

Y1

E

X

Y

Z

Dimensions

Z

(mm)/(inch)

X

(mm)/(inch)

X1

(mm)/(inch)

X2

(mm)/(inch)

Y

(mm)/(inch)

Y1

(mm)/(inch)

E

(mm)/(inch)

Value

4.600/0.181

0.550/0.022

1.850/0.073

0.800/0.031

1.300/0.051

1.475/0.058

1.500/0.059

Suggested Pad Layout (Cont.)

(3) Package Type: SOT89

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DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.

Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.

Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.

This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.

Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:

A. Life support devices or systems are devices or systems which:

1. are intended to implant into the body, or

2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the

labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the

failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and

acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.

Copyright © 2012, Diodes Incorporated

www.diodes.com

IMPORTANT NOTICE

LIFE SUPPORT