LM431AIM3X Rectifier Diode Adjustable Precision Zener Shunt Regulator

LM431 Adjustable Precision Zener Shunt Regulator

General Description

The LM431 is a 3-terminal adjustable shunt regulator with guaranteed temperature stability over the entire temperature range of operation. It is now available in a chip sized package (4-Bump micro SMD) using National’s micro SMD package technology. The output voltage may be set at any level greater than 2.5V (V_REF) up to 36V merely by selecting two external resistors that act as a voltage divided network. Due to the sharp turn-on characteristics this device is an excellent replacement for many zener diode applications.

Features

• Average temperature coefficient 50 ppm/˚C

• Temperature compensated for operation over the full temperature range

• Programmable output voltage

• Fast turn-on response

• Low output noise

• LM431 in micro SMD package

Absolute Maximum Ratings (Note 2)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Storage Temperature Range −65˚C to +150˚C

Operating Temperature Range

Industrial (LM431xI) −40˚C to +85˚C

Commercial (LM431xC) 0˚C to +70˚C

Soldering Information

Infrared or Convection (20 sec.) 235˚C

Wave Soldering (10 sec.) 260˚C (lead temp.)

Cathode Voltage 37V

Continuous Cathode Current −10 mA to +150 mA

Reference Voltage −0.5V

Reference Input Current 10 mA

Internal Power Dissipation (Notes 3, 4)

TO-92 Package 0.78W

SO-8 Package 0.81W

SOT-23 Package 0.28W

micro SMD Package 0.30W

Operating Conditions

Min Max

Cathode Voltage V_REF 37V

Cathode Current 1.0 mA 100 mA

Connection Diagrams

Symbol and Functional Diagrams

DC Test Circuits

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