AP431/AP431A

ADJUSTABLE PRECISION SHUNT REGULATOR

AP431/AP431A

Document number: DS31002 Rev. 15 - 2

1 of 16

www.diodes.com

June 2010

© Diodes Incorporated

Features

•

Precision reference voltage

•

AP431: 2.495V ± 1%

•

AP431A: 2.495V ± 0.5%

•

Sink current capability: 200mA

•

Minimum cathode current for regulation: 300

μA

•

Equivalent full-range temp coefficient: 30 ppm/oC

•

Fast turn-on response

•

Low dynamic output impedance: 0.2

Ω

•

Programmable output voltage to 36V

•

Low output noise

•

Lead Free packages: SOT25, SC59, SC59R, SOT89-3L

and TO92-3L

•

SOT23, SOT23R, SOT25, SC59, SC59R, SOP-8L,

SOT89-3L, TO92-3L: Available in “Green” Molding

Compound (No Br, Sb)

•

Lead Free Finish/ RoHS Compliant (Note 1)

Description

The AP431 and AP431A are 3-terminal adjustable precision

shunt regulators with guaranteed temperature stability over

the applicable extended commercial temperature range.

The output voltage may be set at any level greater than

resistors that act as a voltage divider network. These

devices have a typical output impedance of 0.2

Ω. Active

output circuitry provides very sharp turn-on characteristics,

making these devices excellent improved replacements for

Zener diodes in many applications.

The precise (+/-) 1% Reference voltage tolerance of the

AP431/AP431A make it possible in many applications to

avoid the use of a variable resistor, consequently saving

cost and eliminating drift and reliability problems associated

with it.

Notes:

1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html.

Typical Application Circuit

+

+

R2

R1

Precision Regulator

AP431