Diodes AP431_A - Manual

AP431/AP431A
Document number: DS31002 Rev. 21 - 2
1 of 17
www.diodes.com
June 2013
© Diodes Incorporated
AP431/AP431A
ADJUSTABLE PRECISION SHUNT REGULATOR
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 2.495V (V REF ) up to 36V merely by
selecting two external 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.
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: 30ppm/°C

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 SO-8 and
TO92
 Totally Lead-Free; RoHS Compliant (Notes 1 & 2)

SOT23, SOT23R, SOT25, SC59, SC59R, SO-8, SOT89, TO92:
Available in “Green” Molding Compound (No Br, Sb). See
“Ordering Information”
 Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(1) SOT25 (2) SO-8
4 REF
5 ANODE NC 1
CATHODE 3
NC 2
(Top View)
NC 5 4
1 8
6
7
3
2
ANODE
ANODE
CATHODE
NC
ANODE
REF
ANODE
(Top View)
(3) SC59 (4) SC59R
(5) SOT23 (6) SOT23R
(Top View)
ANODE
1
2
CATHODE
3
REF
(7) SOT89 (8) TO92
1 2 3
Anode Cathode REF
(Top View) (Top View)
1 REF
2 Anode
+
+
+
3 Cathode
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 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.