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ZR431L
Document number: DS33256 Rev. 4 - 2
1 of 9
www.diodes.com
April 2015
© Diodes Incorporated
ZR431L
ADJUSTABLE PRECISION SHUNT REGULATOR
Description
The ZR431L is a three terminal adjustable shunt regulator offering
excellent temperature stability and output current handling capability
up to 25mA. The output voltage may be set to any chosen voltage
between 1.24 and 10 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 ZR431L is particularly used in the feedback control loop of
switch mode power supplies. In this application the device 1.24 volt
reference enables the generation of low voltage supplies, typically
3.3 volts or 3 volts.
Features
2.5% and 1% Tolerance
Max. Temperature Coefficient 50ppm/°C
Temperature Compensated for Operation over The Full
Temperature Range
Programmable Output Voltage
100μA to 100mA Current Sink Capability
Surface Mount SOT23 Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
Applications
Shunt Regulator
Series Regulator
Voltage Monitor
Over Voltage/ Under Voltage Protection
Switch Mode Power Supplies
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.
Typical Applications Circuit
V
REF
2R
1R
1
V
OUT
SHUNT REGULATOR
V
REF
2R
1R
1
V
OUT
HIGHER CURRENT SHUNT REGULATOR
V+ V
OUT
V
REF
R1
R2
V+
V
OUT
R1
R2
V
REF
GND
V
REF
V
Z
1
2
3
SOT23
(Top View)
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