ELM0431AxA Adjustable precision shunt regulator
http://www.elm-tech.com■General description

ELM0431AxA series are three-terminal adjustable regulators with guaranteed thermal stability over applicabletemperature range. The output voltage may be set to any value between Vref (Typ.2.495V) and 40V with two
external resistors. These devices have a typical dynamic output impedance of 0.2Ω. Active output circuitry
provides a very sharp turn-on characteristic, making these devices excellent replacement for zener diodes inmany applications.
ELM0431AxA shunt regulator is available in a SOT-89 package.

■Features• Programmable output voltage• Temperature coefficient is 50ppm/°C typical• Temperature compensated for operation over full temperature range• Low output noise voltage• Fast turn on response• Package: SOT-89■Application• Linear regulator• Precision voltage reference• Switching power supplies• Battery operating equipment• Instrumentation■Classification
RankVrefA
2.495V±0.5%

B2.495V±1%■Maximum absolute ratings

C2.495V±2%(Operating temperature range applies unless otherwise specified)ParameterSymbol
VkaIk
Iref

Cathode voltage
Cathode current range (Continuous)
Reference input current range
Power dissipation (Ta=25℃ )PdJunction temperature
Operationg temperature range (Tj<150℃ )Storage temperature range

TjTopTstg

Limit
42-100 to +150-0.05 to +10500 (*1)
1000 (*2)
150-40 to +125-65 to +150

Unit
VmA
mA
mW°C°C°C* 1. No mounted, IC alone.
* 2. When mounted on glass epoxy 2-layers PCB (EIJ/JEDEC standard size: 76.2 mm×114.3 mm×1.6 mm), Cu thickness 35 μm,copper foil area ratio 20% on the front side, back side 100% .

■Selection guide
ELM0431AxA-S
SymbolaPackagebRankcd

Product version
Taping direction

A: SOT-89
A: 2.495V±0.5%
B: 2.495V±1%
C: 2.495V±2%
A
S: Please refer to page 6

ELM0431 A x A - S
↑↑↑ ↑
abc d

* Taping direction is one way.

Rev.1.11/7

ELM0431AxA Adjustable precision shunt regulator
http://www.elm-tech.com■Pin configuration(TOP VIEW)
Pin No.
123

Pin name
Reference
Anode
Cathode■Circuit
Cathode

Reference
Anode■Block diagram
CathodeReference
VREF+Anode

■MarkingMark431
a to dContentProduct ID
Assembly lot No.

Rev.1.1
2/7

ELM0431AxA Adjustable precision shunt regulator
http://www.elm-tech.com■Electrical characteristics

Vka=Vref, Ik=10mA, Top=25°C, unless otherwise statedCondition
Min. Typ. Max. Unit Note*1A-rank
2.483 2.495 2.507
Reference input voltage B-rank
2.470 2.495 2.520 V
1
Vref Vka=Vref, Ik=10mAC-rank
2.445 2.495 2.545
Vka=Vref, Ik=10mA
Deviation of reference input voltageΔVref
417mV1over-temperature (Note)
Tmin≤Top≤Tmax *2
Ik=10mA,-1.4 -2.7
Ratio of change in reference input
ΔVref ΔVka=10V~Vrefvoltage to the changemV/V 2ΔVka Ik=10mA,
in cathode voltage-1.0 -2.0
ΔVka=36V to 10V
Ik=10mA, R1=10kΩ,
Reference input current
Iref
1.1
4.0
μA
2
R2=∞
Deviation of reference input current
Ik=10mA, R1=10kΩ,
ΔIref
0.4
1.2μA
2
over full temperature range
R2=∞, Tmin≤Top≤Tmax *2
Minimum cathode current
Ik(min) Vka=Vref
0.33 0.50 mA1for regulation
Off-state cathode current
Istandby Vka=36V, Vref=0V
0.17 1.00 μA
3Vka=Vref, f≤1.0KHz
Dynamic impedance
Zout
0.20.5
Ω1Ik=1 to 100mA*1) : test circuit No.
*2) : Tmin=0°C, Tmax=70°C
Parameter

Symbol■Test circuits
IFig1. Test circuit for Vka=Vref

IFig2. Test circuit for Vka>Vref
Note: Vka=Vref(1+R1/R2)+Iref×R1

Fig3. Test circuit for Off-Statecurrent

Rev.1.1
3/7

ELM0431AxA Adjustable precision shunt regulator
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Rev.1.1
4/7

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ELM0431AxA Adjustable precision
shuntregulator

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Typical Characteristics(Cont.)� �� �� � � � � � � � � �� � � � �������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� � � � �� � � � � � � � � � � � � � � � � � � �■Testcircuit
forforstability
boundary
Test
Circuit
Stability
Boundaryconditions
Conditions
Vka=VrefVKA=VREF

Vka=5V,10V,10V,15V
15V
VKA=5V,ll� CL : MLCC capacitor

Rev.1.1
5/7

ELM0431AxA Adjustable precision shunt regulator
http://www.elm-tech.com■Reel & carrier tape dimension
Reel Dimension
Reel• Reel Dimension

Carrier Tape Dimension
Tape Dimension•Carrier
Carrier tape

Rev.1.1
6/7

ELM0431AxA Adjustable precision shunt regulator
http://www.elm-tech.com■SOT-89 dimension
SOT-89 Dimension

A21

3H

C

D

B

F

E

I

G

InchesMin.
Max.
0.1732 0.1811
0.1551 0.1673
0.0610 REF
0.0906 0.1024
0.0126 0.0205

DIM
A
B
C
DE

Millimeters
Min.
Max.
4.40
4.60
3.94
4.25
1.55 REF
2.30
2.60
0.32
0.52

DIM
FGH
I

Inches
Min.
Max.
0.0591 TYP
0.1181 TYP
0.0551 0.0630
0.0138 0.0173

Millimeters
Min.
Max.
1.50 TYP
3.00 TYP
1.40
1.60
0.35
0.44

Notes: 1.Controlling dimension: millimeters.

2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material.

Material:• Lead: Pure tin plated.
• Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0.

Rev.1.1
7/7