Diodes ZR431L - Manual

Issue 3 - April 2008 1 www.zetex.com
© Zetex Semiconductors plc 2008
ZR431L
Adjustable precision shunt regulator
Summary
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 50 ppm/°C
• Temperature compensated for operation over -40 to 85°C
• 100mA to 25mA current sink capability
• Surface mount SOT23 package
Applications
• Switch mode power supplies
• Shunt regulator
• Series regulator
• Voltage monitor
• Over voltage / under voltage protection
Ordering information
Device Pack Part mark Status Quantity
per reel
Reel size
(inches)
TOL %
ZR431LF01TA SOT23 43M Active 3000 7 1
ZR431LF02TA SOT23 43L Active 3000 7 2.5
ZR431LC01STOB TO92 ZR431L01 Obsolete 1500 1
ZR431LC02STOB TO92 ZR431L02 Obsolete 1500 2.5
ZR431LC01L TO92 ZR431L01 Obsolete Loose 1
ZR431LC02L TO92 ZR431L02 Obsolete Loose 2.5