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AP432/AP432A

Document number: DS31003 Rev. 18 - 2

1 of 15

www.diodes.com

September 2012

AP432/AP432A

ADJUSTABLE PRECISION SHUNT REGULATOR

Description

The AP432 and AP432A are 3-terminal adjustable precision shunt

regulators with guaranteed stable temperature over the applicable

extended commercial temperature range. The output voltage may be

set at any level greater than 1.24V (V

REF

) up to 20V 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.

The precise +/- 1% reference voltage tolerance of the

AP432/AP432A 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

 AP432 : 1.24V ± 1%

 AP432A : 1.24V ± 0.5%

• Sink Current Capability: 200mA

• Minimum Cathode Current for Regulation: 150μA

• Equivalent Full-Range Temp Coefficient: 30 ppm/°C

• Fast Turn-On Response

• Low Dynamic Output Impedance: 0.2Ω

• Programmable Output Voltage to 20V

• Low Output Noise

• Lead Free packages: SOT25, SC59, SC59R, SOT89-3 and

TO92

 Lead-Free Finish; RoHS Compliant (Notes 1 & 2)

• SOT23, SOT23R, SOT25, SC59, SC59R, SO-8, SOT89 and

TO92: Available in “Green” Molding Compound (No Br, Sb)

 Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

(1) SOT25 (2) SO-8

4REF

5 ANODE

CATHODE

(Top View)

ANODE

CATHODE

ANODE

REF

ANODE

(Top View)

(3) SC59 (4) SC59R

(Top View)

ANODE 1

REF

2 CATHODE

ANODE 1

2REF

3 CATHODE

(Top View)

(5) SOT23 (6) SOT23R

(Top View)

ANODE 1

2CATHOD

3REF

(Top View)

ANODE

CATHODE3

REF

(7) SOT89-3 (8) TO92

Anode Cathode

REF

(Top View)

1 REF

2 Anode

3 Cathode

Notes: 1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.

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.

Typical Applications Circuit

OUTVIN

V OUT = (1+R 1/R 2)VREF

Precision R egulator

in C out

AP432

Summary of content (15 pages)

PAGE 1
AP432/AP432A ADJUSTABLE PRECISION SHUNT REGULATOR Description Pin Assignments The AP432 and AP432A are 3-terminal adjustable precision shunt (1) SOT25 regulators with guaranteed stable temperature over the applicable (2) SO-8 (Top View) (Top View) extended commercial temperature range. The output voltage may be set at any level greater than 1.24V (VREF) up to 20V merely by NC 5 ANODE 1 selecting two external resistors that act as a voltage divider network.
PAGE 2
AP432/AP432A Functional Block Diagram REF (R) + Cathode (C) VREF Anode (A) Functional Block Diagram Cathode (C) REF (R) Anode (A) Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.
PAGE 3
AP432/AP432A Electrical Characteristics (@TA = +25°C, unless otherwise specified.) Symbol Parameter Test Conditions VREF Reference voltage VKA = VREF, I KA = 10mA (Figure 1) VREF Deviation of reference input voltage over temperature (Note 4) VKA = VREF, IKA = 10mA, Ta = Full range (Figure 1) ΔVREF ΔVKA Ratio of the change in reference voltage to IKA = 10mA (Figure 2) the change in cathode voltage Min AP432 AP432A VKA = 20 ~ VREF Typ Max Unit 1.227 1.233 1.24 1.252 1.246 V ⎯ 3.
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AP432/AP432A Test Circuits Input IN VKA IN IKA IKA VKA R1 VREF R2 VKA IREF VREF IZ(OFF) Note:VKA=VREF(1+R1/R2)+IREFxR1 Fig 1. Test Circuit for VKA= VREF Fig 2. Test Circuit for VKA > VREF Fig 3. Test Circuit for Off-State Current Typical Performance Characteristics AP432/AP432A Document number: DS31003 Rev. 18 - 2 4 of 15 www.diodes.
PAGE 5
AP432/AP432A Typical Performance Characteristics (cont.) Sm all-Signal Voltage Am plification vs Frequency I KA =10m A T A =25 o C 50 O utput 15KΩ 40 + 9μF I KA - AV-Small Signal Voltage Amplification (dB) 60 232Ω + 30 - 8.25KΩ G ND 20 Test C ircuit for Voltage Am plification 10 0 10K 1K 100K 1M 10M f-Frequency-H z Reference Impedance vs Frequency ∣ZKA∣ Reference Impedance (Ω) 100 I KA=10mA o TA =25 C 1KΩ Output I KA 10 50Ω + GND 1 Test Circuit for Reference Impedance 0.
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AP432/AP432A Application Examples VIN V IN RCL R R1B R1A ON R2A R2B I OUT VIN + OFF LED on when Low Limit
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AP432/AP432A Ordering Information AP432 X XX X X Reference Voltage Tolerance Package SA : SOT23 SR : SOT23R Q : SOT25 W : SC59 R : SC59R Blank : SO-8 Y : SOT89-3 V : TO92 Blank : ± 1% A : ± 0.
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AP432/AP432A Marking Information (1) SC59 and SC59R ( Top View ) 3 XX : Identification code Y : Year 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : A~Z : Green a~z : Lead Free XX Y W X 1 2 (2) SOT23 and SOT23R ( Top View ) 3 XX : Identification code Y : Year 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : A~Z : Green XX Y W X 1 2 (3) SOT25 ( Top View ) 4 7 5 XX : Identification code Y : Year 0~9 W : Week : A~Z : 1~26 week;
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AP432/AP432A Marking Information (cont.) (5) SOT89-3 ( Top View ) XX Y W X 1 2 3 XX : Identification code Y : Year : 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : Internal code A~Z : Green a~z : Lead Free (6) TO92 ( Top View ) Accuracy Blank: 2.495 + 1% A: 2.495 + 0.
PAGE 10
AP432/AP432A Package Outline Dimensions (All dimensions in mm.) Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version. (1) SOT25 SOT25 Dim Min Max Typ A 0.35 0.50 0.38 B 1.50 1.70 1.60 C 2.70 3.00 2.80 D ⎯ ⎯ 0.95 H 2.90 3.10 3.00 J 0.013 0.10 0.05 K 1.00 1.30 1.10 L 0.35 0.55 0.40 M 0.10 0.20 0.15 N 0.70 0.80 0.75 0° 8° α ⎯ All Dimensions in mm A B C H K M N J L D SC59 Min Max Typ 0.35 0.50 0.38 B 1.50 1.70 1.60 C 2.70 3.00 2.80 D 0.95 G 1.90 H 2.90 3.10 3.00 J 0.
PAGE 11
AP432/AP432A Package Outline Dimensions (cont.) (All dimensions in mm.) Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version. 0.254 (4) SO-8 E1 E A1 L Gauge Plane Seating Plane Detail ‘A’ 7°~9° h 45° Detail ‘A’ A2 A A3 b e SO-8 Dim Min Max A 1.75 A1 0.10 0.20 A2 1.30 1.50 A3 0.15 0.25 b 0.3 0.5 D 4.85 4.95 E 5.90 6.10 E1 3.85 3.95 e 1.27 Typ h 0.35 L 0.62 0.82 0° 8° θ All Dimensions in mm D (5) SOT89-3 D1 0 .20 R0 SOT89 Dim Min Max A 1.40 1.60 B 0.44 0.
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AP432/AP432A Package Outline Dimensions (cont.) (All dimensions in mm.) Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version. (6) TO92 B A EJECTION MARK E EJECTION MARK E L2 L3 b L L1 e e c e2 e2 TO92 Dim Min Max Typ A 3.45 3.66 B 4.27 4.78 b 0.38 c 0.38 D 3.87 E 4.32 4.83 e 1.27 e2 2.40 2.90 L 12.98 15.00 L1 12.80 15.00 L2 0.80 L3 2.00 3.00 N 1.22 1.37 All Dimensions in mm TAPED PRODUCT LOOSE PRODUCT D N AP432/AP432A Document number: DS31003 Rev.
PAGE 13
AP432/AP432A Suggested Pad Layout Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. (1) SOT25 C2 Z C2 Dimensions Value (in mm) Z 3.20 G 1.60 X 0.55 Y 0.80 C1 G C1 C2 Y 2.40 0.95 X (2) SC59 and SC59R Y Z Dimensions Value (in mm) Z 3.4 X 0.8 Y 1.0 2.4 C 1.35 E C X E (3) SOT23 and SOT23R Y Z Dimensions Value (in mm) Z 2.9 X 0.8 Y 0.9 2.0 C 1.35 E C X E (4) SO-8 X Dimensions X Y C1 C2 C1 Value (in mm) 0.60 1.55 5.4 1.
PAGE 14
AP432/AP432A Suggested Pad Layout (cont.) Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. (5) SOT89-3 X1 Dimensions Value (in mm) X 0.900 X1 1.733 X2 0.416 Y 1.300 Y1 4.600 Y2 1.475 Y3 0.950 Y4 1.125 C 1.500 X2 (2x) Y1 Y3 Y4 Y2 Y C X (3x) (6) TO92 for Ammo Pack AP432/AP432A Document number: DS31003 Rev. 18 - 2 14 of 15 www.diodes.
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AP432/AP432A IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).