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ZR431L

1.24V adjustable Shunt Regulator

Datasheet

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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.

Feature(s)

2.5% and 1% tolerance

Max. temperature coefficient 50 ppm/°C

Temperature compensated for operation over -40 to 85°C

100mA to 25mA current sink capability

Surface mount SOT23 package

Application(s)

Switch mode power supplies

Shunt regulator

Series regulator

Voltage monitor

Over voltage / under voltage protection

Product Specifications

Product Parameters

Type	Shunt regulator
Compliance (Only Automotive supports PPAP)	Standard
AEC Qualified	No
ReferenceVoltage (V)	1.24 V
Tolerance (%)	2.5, 1 %
Maximum Input Voltage (V)	10 V
Sink Current (mA)	25 mA
Minimum Cathode Current for Regulation Typ (µA)	30 µA
Typical Temperature Coefficient (ppm/°C)	26 ppm/°C
Maximum Slope Resistance (Ω)	2 Ω
Operating Ambient Temperature Range (°C)	-40 to 85 °C

Technical Documents

SPICE Model

ZR431L.spice.txt

ICP Reports

SOT23epICP.pdf (1.5 MB)

Recommended Soldering Techniques

TN1.pdf