AP431/AP431A
ADJUSTABLE PRECISION SHUNT REGULATOR
Description
Features
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 (VREF) up to
36V merely by selecting two external resistors that act as a
voltage divider network. These devices have a typical output
impedance of 0.2Ω. Active output circuitry provides very sharp
turn-on characteristics, making these devices excellent improved
replacements for Zener diodes in many applications.
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Precision reference voltage
AP431 : 2.495V ± 1%
AP431A : 2.495V ± 0.5%
Sink current capability: 200mA
Minimum cathode current for regulation: 300µA
Equivalent full-range temp coefficient: 30 ppm/oC
Fast turn-on response
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Low dynamic output impedance: 0.2Ω
Programmable output voltage to 36V
Low output noise
The precise (+/-) 1% Reference voltage tolerance of the
Packages: SOT-23 and SC-59. SOT-25, PowerDITM5,
SOP-8L, and DFN under development
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.
Ordering Information
A P 4 3 1 A X X X
Packing
Reference Voltage
Package
Lead-Free
SA
SB
SN
PB
SM
FB
: SOT23
: SOT25
: SC-59
: PowerDI™5
: SOP-8L
: DFN
Tolerance:
Blank : +/- 1%
F : Lead-Free
G : Green
Blank : Tube or bulk
-7/-13 : Taping
A
: +/- 0.5%
7” Tape and Reel
13” Tape and Reel
Device
Package Packaging
Quantity
Part
Quantity
Part
(Note 1)
Code
(Note 2)
Number
Number
Suffix
Suffix
AP431(A)SA
AP431(A)SB
AP431(A)SN
AP431(A)PB
AP431(A)SM
AP431(A)FB
SA
SOT-23
SOT-25
SC-59
PowerDI™5
SOP-8L
DFN
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
NA
3000/Tape & Reel
3000/Tape & Reel
-7
-7
10,000/Tape & Reel
10,000/Tape & Reel
10,000/Tape & Reel
5000/Tape & Reel
10,000/Tape & Reel
10,000/Tape & Reel
-13
SB
SN
PB
SM
FB
-13
-13
-13
-13
-7
NA
-7
-7
-13
Typical Application Circuit
VIN
VOUT
+
+
R1
R2
Cin
Cout
DP431
VOUT = (1+R1/R2)VREF
Precision Regulator
Notes: 1. Suffix “A” denotes AP431A device.
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
DS30714 Rev. 2 - 2
1 of 12
AP431/AP431A
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