Diodes ZTL432 User Manual

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ZTL431/ZTL432

COST EFFECTIVE ADJUSTABLE PRECISION SHUNT REGULATOR

Description

The ZTL431 and ZTL432 are three terminal adjustable shunt

regulators offering excellent temperature stability and output current

handling capability up to 100mA. The output voltage may be set to

any chosen voltage between 2.5 and 20 volts by selection of two

external divider resistors.

The devices can be used as a replacement for zener diodes in many

applications requiring an improvement in zener performance.

The ZTL432 has the same electrical specifications as the ZTL431 but

has a different pin out in SOT23 (F-suffix) and SOT23F (FF-suffix).

Both variants are available in 2 grades with initial tolerances of 1%

and 0.5% for the A and B grades respectively.

These are functionally equivalent to the TL431/ TL432 except for

maximum operation voltage, and have an ambient temperature range

of -40°C to +125°C as standard.

Features

 Temperature Range ................ -40°C to +125°C

 Reference Voltage Tolerance at +25°C

 0.5%.......................................B grade

 1% .........................................A grade

 0.2 typical output impedance

 Sink Current Capability…….. 1mA to 100mA

 Adjustable Output Voltage……V

 Qualified to AEC-Q100 Standards for High Reliability

 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

 Halogen and Antimony Free. “Green” Device (Note 3)

REF

to 20V

Applications

 Opto-Coupler Linearization

 Linear Regulators

 Improved Zener

 Variable Reference

Pin Assignments

ZTL431_F SOT23, ZTL431_FF SOT23F

Cathode

Ref

ZTL432_F SOT23, ZTL432_FF SOT23F

Ref

Cathode

ZTL431_H6, SOT363

Cathode

N/C

Ref

†Connected internally to substrate;

should be left floating or connected to Anode

ZTL431ASE5 SOT25

Cathode

Anode

Ref

ZTL431_E5 SOT25

N/C

N/C*

Cathode

(Top View)

†

Anode

N/C

(Top View)

must be left floating or

connected to pin 5

Anode

†

N/C

Anode

Ref

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.

ZTL431/ZTL432

Document number: DS33263 Rev. 16 - 2

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Absolute Maximum Ratings (Voltages specified are relative to the ANODE pin unless otherwise stated.)

Parameter Rating Unit

Cathode Voltage (VKA)

Continuous Cathode Current (IKA)

Reference Input Current Range (I

REF

)

20 V

150 mA

-50µA to +10mA

Operating Junction Temperature -40 to +150 °C

Storage Temperature -55 to +150 °C

Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum ratings, for extended periods, may reduce device reliability.

Package Thermal Data

Package



= +25°C, TJ = +150°C

SOT23 380°C/W 330mW

SOT23F 138°C/W 900mW

SOT25 250°C/W 500mW

SOT363 380°C/W 330mW

Recommended Operating Conditions (@T

DIS

= +25°C, unless otherwise specified.)

ZTL431/ZTL432

Symbol Parameter Min Max Unit

Cathode Voltage

VKA

Cathode Current 1 100 mA

IKA

Operating Ambient Temperature Range -40 +125 °C

Electrical Characteristics (@T

REF

= +25°C, unless otherwise specified.)

20 V

Symbol Parameter Conditions Min Typ Max Units

REF

DEV

V

REF

VKA

REF

I

REF

KA(MIN)

KA(OFF)

Reference Voltage

Deviation of Reference Voltage Over Full Temperature Range

Ratio of Change In Reference Voltage To the Change In Cathode Voltage

Reference Input Current

Deviation Over Full Temperature Range

REF

Minimum Cathode Current for Regulation

Off State Current

Dynamic Output Impedance

= V

REF

IKA = 10mA

= V

REF

= 10 mA

= 10mA

IKA = 10mA, R1 = 10k, R2 = OC

= 10mA

= 10k

= OC

VKA = V

REF

= 20V, V

REF

VKA = V

, f = 0Hz

REF

ZTL43_A 2.475 2.5 2.525

ZTL43_B 2.487 2.5 2.513

= 0 to 70°

TA = -40 to 85°C

TA = -40 to 125°C

= V

REF

to 10

VKA = 10V to 20V

6 16

14 34

-1.4 -2.7

-1.0 -2.0

mV/V

2 4 µA

= 0 to 70°C

TA = -40 to 85°C

TA = -40 to 125°C

0.8 1.2

0.8 2.5

µA

0.4 0.6 mA

0.1 0.5 µA

0.2 0.5 

ZTL431/ZTL432

Document number: DS33263 Rev. 16 - 2

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Typical Characteristics

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ZTL431/ZTL432

IKA=10mA

Reference Voltage vs. Temperature

REF=VKA

Dynamic Impedance vs. Frequency

1000

SOT23F

900

800

700

600

SOT23-5

500

400

300

SOT23

SC70-6

200

100

Power Dissipation (

0 255075100125

Ambient Temperature (°C)

Power Dissipation Derating

ZTL431/ZTL432

Document number: DS33263 Rev. 16 - 2

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