AP431/AP431A
ADJUSTABLE PRECISION SHUNT REGULATOR
General 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%
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Sink current capability: 200mA
Minimum cathode current for regulation: 300μA
Equivalent full-range temp coefficient: 30 ppm/oC
Fast turn-on response
Low dynamic output impedance: 0.2Ω
Programmable output voltage to 36V
Low output noise
Packages: SOT23, SOT23R, SOT25, SOT89-3L, SC59,
SC59R, SOP-8L and TO92-3L
Lead Free packages: SOT25, SOT89-3L, SC59,
SC59R and TO92-3L
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.
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SOP-8L, SOT23, SOT23R, SC59, SC59R: Available in
“Green” Molding Compound (No Br, Sb) (Note 2)
Lead Free Finish/ RoHS Compliant (Note 3)
Ordering Information
AP431 X XX X X
Package
Lead Free
Reference Voltage
Packing
Tolerance
Blank : +/- 1%
A : +/- 0.5%
SA : SOT23
SR : SOT23R
Q : SOT25
W : SC59
R : SC59R
L : Lead Free (Note 1)
G : Green (Note 2)
-U : Tube
-7/ 13 : Tape & Reel
-A : Ammo Box (Note 4)
Blank : SOP-8L
Y : SOT89-3L
V : TO92-3L
7” Tape and Reel
13” Tape and Reel
Ammo Box
Part Number
Device
(Note 5)
Package Packaging
Part Number
Suffix
Part Number
Suffix
Code
(Note 3, 6)
Quantity
Quantity
NA
Quantity
Suffix
3000/Tape
& Reel
SA
SR
Q
SOT23
SOT23R
SOT25
SC59
-7
NA
NA
NA
NA
NA
-13
NA
NA
AP431(A)SA
AP431(A)SR
AP431(A)Q
AP431(A)W
AP431(A)R
AP431(A)
3000/Tape
& Reel
-7
NA
NA
NA
NA
NA
NA
NA
NA
-A
3000/Tape
& Reel
-7
NA
NA
Lead-free
3000/Tape
& Reel
W
-7
NA
NA
3000/Tape
& Reel
R
SC59R
SOP-8L
-7
NA
NA
2500/Tape
& Reel
NA
NA
NA
2500/Tape
& Reel
Y
V
SOT89-3L
TO92-3L
NA
NA
NA
NA
-13
NA
NA
AP431(A)Y
AP431(A)V
Lead-free
Lead-free
NA
2000/Box
Notes:
1. SOT25, SOT89-3L and TO92-3L are “Lead Free” products only.
2. SOP-8L, SOT23 and SOT23R are available in “Green” product only.
3. RoHS revision 13.2.2003. Glass and high temperature solder exemptions applied, see EU Directive Annex Notes 5 and 7
4. Ammo Box is for TO92-3L Spread Lead.
5. Suffix “A” denotes AP431A device.
6. 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.
AP431/AP431A Rev. 10
1 of 16
APRIL 2008
www.diodes.com
© Diodes Incorporated