RS431/ RS432

RS431/ RS432 Precision Programmable Reference
1 FEATURES

3 DESCRIPTIONS•

Reference Voltage Tolerance at 25°C
0.5% (A Grade)
1% (B Grade)•Programmable Output Voltage to 36 V•

Low Dynamic Output Impedance 0.2 Ω•

Sink Current Capability of 0.5mA to 100mA•

Equivalent Full-Range Temperature
Coefficient of 50ppm/°C Typical•

Temperature Compensated for Operation
Over Full Rated Operating Temperature
Range

Both the RS431 and RS432 devices are offered in twogrades, with initial tolerances (at 25°C) of 0.5% and 1%,for A and B grade.

•

Low Output Noise Voltage•

Fast Turn on Response•

Operation Junction Temperature from -40°C
to 150°C•Device Information (1)PART NUMBER

PACKAGE(PIN)

RS431

SOT23(3)

BODY SIZE(NOM)
1.30mm×2.92mm

RS432

SOT23(3)1.30mm×2.92mm

Lead-Free Packages: SOT23

2 APPLICATIONS•

Adjustable Voltage and Current
Referencing•

Power Supply•

Zener Replacement•

Voltage Monitoring•

Comparator with Integrated Reference•

The RS431 and RS432 device are three-terminal
adjustable shunt regulators, with a guaranteed thermal
stability over applicable temperature ranges. The output
voltage can be set to any value between V REF(approximately 2.5V) and 36V with two externalresistors. These devices have provided a very sharp
turn-on characteristic, making these devices excellent
replacement for Zener diodes in many applications.

(1)

For more detail information packages, see the order sheet.

4 Function Block Diagram
CATHODE

REFERENCE

REFERENCE(R)

2.5V Vref

As Precision Voltage Reference

CATHODE(K)

ANODE(A)ANODE

REV A.5

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RS431/ RS432
Table of Contents
1 FEATURES .......................................................................................................................................................12 APPLICATIONS ................................................................................................................................................13 DESCRIPTIONS ................................................................................................................................................14 Function Block Diagram .................................................................................................................................15 Revision History ..............................................................................................................................................36 PACKAGE/ORDERING INFORMATION (1) ......................................................................................................47 Pin configuration and Functions (Top View) ................................................................................................58 SPECIFICATIONS ............................................................................................................................................68.1 Absolute Maximum Ratings ........................................................................................................................68.2 ESD Ratings................................................................................................................................................68.3 Recommended Operating Conditions .........................................................................................................68.4 Thermal Information ....................................................................................................................................78.5 Electrical Characteristics .............................................................................................................................88.6 TYPICAL APPLICATIONS CIRCUIT ..........................................................................................................98.7 TYPICAL PERFORMANCE CHARACTERISTICS .................................................................................. 109 PACKAGE OUTLINE DIMENSIONS ............................................................................................................. 12
10 TAPE AND REEL INFORMATION .............................................................................................................. 132 / 14

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RS431/ RS432
5 Revision History
Note: Page numbers for previous revisions may different from page numbers in the current version.
VersionChange Date

Change Item

A.1

2018/11/03

A.2

2020/03/25

A.3

2021/10/28

A.4

2022/07/01

Initial version completed(1) Change part-number to ordering information table for production management.
(2) Added Figure 8 Reference Voltage vs. Ambient Temperature(1) Update parameters in Electrical Characteristics on Page 5@A.2 Version(2) Update parameters in Typical Performance Characteristics on Page 7, 8@A.2 Version
Update PACKAGE MARKING on Page 4@RevA.3

A.5

2023/05/11

Add RS431AYSF3-C and RS432AYSF3-C ORDERING NUMBER on Page 4@RevA.4

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RS431/ RS432
6 PACKAGE/ORDERING INFORMATION (1)PRODUCT

RS431

RS432

ORDERING
NUMBERVOLTAGETOLERANCEPACKAGELEAD

PACKAGEMARKING (2)PACKAGE OPTION

RS431AYSF30.5%

SOT23431A
XXXXX

Tape and Reel,3000

RS431AYSF3-C

0.5%

SOT23431A
XXXXX

Tape and Reel,3000

RS431BYSF31%

SOT23431B
XXXXX

Tape and Reel,3000

RS432AYSF3

0.5%

SOT23432AXXXXXTape and Reel,3000

RS432AYSF3-C

0.5%

SOT23432AXXXXXTape and Reel,3000

RS432BYSF31%

SOT23432B
XXXXX

Tape and Reel,3000

NOTE:(1) This information is the most current data available for the designated devices. This data is subject to change without notice and revisionof this document. For browser-based versions of this data sheet, refer to the right-hand navigation.
(2) Package marking:Line1: Product modelLine2：Assembly code(1-bit) + date code (1-bit year + 2-bit week) +1-bit LOT code

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RS431/ RS432
7 Pin configuration and Functions (Top View)
Cathode 1

Ref 13 AnodeRef 23 Anode
Cathode 2

RS431

RS432

Pin Description
PIN
NAME

DESCRIPTION
RS431

RS432

Cathode1

2

Shunt Current/ Voltage input

Ref2

1Threshold relative to common anode

Anode

3

3Common pin, normally connected to ground5 / 14www.run-ic.com

RS431/ RS432
8 SPECIFICATIONS
8.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)(2)
CharacteristicsSymbol

Cathode Voltage

VKA-0.337V

Cathode Current Range (Continuous)

IKA-100+155mA

Reference Input Current Range

IREF-0.05+10mA

Operating junction temperatureTopr-40

Power Dissipation

PDStorage temperature

Tstg

(1)

(2)

MIN

MAX

UNIT°C+150mW

370
-55°C

150

Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stressratings only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect devicereliability.
All voltages are with respect to the GND pin.

8.2 ESD Ratings
The following ESD information is provided for handling of ESD-sensitive devices in an ESD protected area only.

V(ESD)

Electrostatic
discharge

VALUE

UNIT

Human-Body Model (HBM), per ANSI/ESDA/JEDEC JS-001(1)

±4000

V

Charge Device Model (CDM), per ANSI/ESDA/JEDEC JS-002(2)±1000

VMachine Model (MM)±200V(1) JEDEC document JEP155 states that 500 V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250 V CDM allows safe manufacturing with a standard ESD control process.

ESD SENSITIVITY CAUTION
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small parametric changes could cause the device not to meet its
published specifications.

8.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
Characteristics

SymbolMINMAXUNIT

Cathode Voltage

VKAVREF36VCathode Current Range (Continuous)

IKA

0.5100mA

Operating Ambient Temperature Range

TA-40+125°C

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RS431/ RS432
8.4 Thermal Information
RS431/ RS432
THERMAL METRIC (1)

SOT23UNIT

3 PINS
RθJA

Junction-to-ambient thermal resistance

185.6°C/W

RθJC (top)Junction-to-case (top) thermal resistance

104.3°C/W

RθJB

Junction-to-board thermal resistance

54.5°C/W

ψJT

Junction-to-top characterization parameter

31.0°C/WψJB

Junction-to-board characterization parameter

54.5°C/W

RθJC (bot)Junction-to-case (bottom) thermal resistance

N/A°C/W(1) Thermal resistance varies with operating conditions.

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RS431/ RS432
8.5 Electrical Characteristics(Over recommended operating conditions, Full= -40°C to +125°C, typical values are at TA= +25°C, unless otherwise noted.)
PARAMETERSYMBOL

MIN

TYP

MAX

UNIT

0.5%

2.488

2.50

2.512

V

1%

2.475

2.50

2.525

V-2060mV

ΔVKA=10V~VREF--1.2-2.0

CONDITIONS

Reference Input Voltage

VREF

VKA=VREF,
IKA=10mA

Deviation of reference Input Voltage
Over temperature

ΔVREF

VKA=VREF, IKA=10mA
TA= -40°C ~ +125°C

Ratio of Change in Reference Input
Voltage to the Change in CathodeVoltage

ΔVREF/ΔVKA

IKA=10mA

ΔVKA=36V~10V--1.5-2.0

Reference Input Current

IREF

IKA=10mA, R1=10kΩ, R2=∞

-1.7

4.0uA

ΔIREF

IKA=10mA, R1=10kΩ, R2=∞
TA= -40°C ~ +125°C-25uA

Minimum cathode current for regulation IKA (min)VKA=VREF

-0.3

0.5mA

Off-state Cathode Current

IKA (OFF)

VKA=36V, VREF=0V-0.05

0.5uADynamic Impedance

ZKA

VKA=VREF, IKA=1mA to100mAf≤1.0KHz-0.20.5

ΩDeviation of Reference Input Current
Over Full Temperature Range

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RS431/ RS432
8.6 TYPICAL APPLICATIONS CIRCUIT
R3

VIN

VOUT
VOUT= (1+R1/R2)*VREF

R1

VREF

RS431

R2

Figure 1. Shunt Regulator
VIN

VOUT
R3
R4

VOUT= (1+R1/R2)*VREF

R1

VREF

RS431

R2

Figure 2. High Current Shunt Regulator
VIN
R2

IOUT

R1

IOUT= V REF/R2+IKA

RS431

Figure 3. Current Source or Current Limit

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RS431/ RS432
8.7 TYPICAL PERFORMANCE CHARACTERISTICS

1401201008060
40200-20-40-60

VKA=VREF
TA=25℃-1

Cathode Current(μA)

Cathode Current(mA)

NOTE: The graphs and tables provided following this note are a statistical summary based on a limited number of samples
and are provided for informational purposes only.

0121200
1000
800
600
400
2000-200-400-600

VKA=VREF
TA=25℃

IKA(min)-130123

Cathode Voltage (V)Cathode Voltage (V)Figure 4. Cathode Current vs Cathode Voltage

Figure 5. Cathode Current vs Cathode Voltage

TA=25℃Input
2V/ div

IKA=10mA
TA=25℃-5-10-15-20-25Output
1V/ div

Change In Reference Input
Voltage (mV)0-30-35-4005101520253035100us/ div

40

Cathode Voltage (V)Figure 6. Change in Reference Input Voltagevs Cathode voltage

Figure 7. Pulse Response

10070Voltage Amplification (dB)

Impedance (Ω)

IKA=1mA~100mA
TA=25℃

1010.1

IKA=10mA
TA=25℃

6050403020100-101K

10K

100K

1M

10M

1K

Frequency (Hz)Figure 8. Dynamic Impedance vs Frequency

10K

100K

1M

10M

Frequency (Hz)Figure 9. Small Signal Voltage Amplification
vs Frequency
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RS431/ RS432
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

100
90 A VKA=VREF
B V =5V
80 C VKA =10VKA
70 D VKA=15V
60
50
A
40
30
Stable201000.001
0.01

2.505

Reference Voltage VREF (V)IKA-Cathode Current (mA)

NOTE: The graphs and tables provided following this note are a statistical summary based on a limited number of samples
and are provided for informational purposes only.

TA=25℃
BCStable

D

2.495
2.49
2.485
2.48
2.475

0.1

1-40 -20

10020 40 60 80 100 120 140
Temperature (℃)

CL-Load Capacitance (uF)

Figure 10. Cathode Current vs Load
Capacitance
Reference Input Current IREF (uA)VKA=VREF
IKA= 10mA

2.5

Figure 11. Reference Voltage vs Ambient
Temperature

4
VKA=VREF
IKA= 10mA

3.5
3
2.5
2

1.5
1
0.5
0-40 -20020 40 60 80 100 120 140
Temperature (℃)

Figure 12. Reference Input Current vs Ambient
Temperature

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RS431/ RS432
9 PACKAGE OUTLINE DIMENSIONS
SOT23
D

1.90

b2.29

E1E
0.76
0.95

0.76

ee1

RECOMMENDED LAND PATTERN (Unit: mm)

0.2
A A2c

θ
L

A1Dimensions In Millimeters

Dimensions In Inches

SymbolMinMax

Min

Max

A

0.900

1.150

0.035

0.045

A1

0.000

0.100

0.000

0.004

A2

0.900

1.050

0.035

0.041

b0.300

0.500

0.012

0.020

c

0.080

0.150

0.003

0.006

D

2.800

3.000

0.110

0.118

E

1.200

1.400

0.047

0.055

E12.250

2.550

0.089

0.100

e0.950 (BSC)

0.037 (BSC)

e1

1.8002.000

0.071

0.079

L

0.300

0.500

0.012

0.020

θ

0°

8°

0°8°

NOTE:
A. All linear dimension is in millimeters.
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion. Mold flash and protrusion shall not exceed 0.15 per side.
D. BSC: Basic Dimension. Theoretically exact value shown without tolerances.

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RS431/ RS432
10 TAPE AND REEL INFORMATIONREEL DIMENSIONSTAPE DIMENSION

ReelDiameter

Reel Width(W1)

DIRECTION OF FEEDNOTE: The picture is only for reference. Please make the object as the standard.

KEY PARAMETER LIST OF TAPE AND REEL
Package Type
SOT23

ReelDiameter
7’’

Reel Width(mm)9.5

A0(mm)
3.15

B0(mm)
2.77

K0(mm)
1.22

P0(mm)
4.0

P1(mm)
4.0

P2(mm)
2.0

W(mm)
8.0

Pin1
Quadrant
Q3

NOTE:
1. All dimensions are nominal.
2. Plastic or metal protrusions of 0.15mm maximum per side are not included.

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RS431/ RS432
IMPORTANT NOTICE AND DISCLAIMER
Jiangsu RUNIC Technology Co., Ltd. will accurately and reliably provide technical and reliability data (includingdata sheets), design resources (including reference designs), application or other design advice, WEB tools,
safety information and other resources, without warranty of any defect, and will not make any express or implied
warranty, including but not limited to the warranty of merchantability Implied warranty that it is suitable for a
specific purpose or does not infringe the intellectual property rights of any third party.
These resources are intended for skilled developers designing with RUNIC products You will be solely
responsible for: (1) Selecting the appropriate products for your application; (2) Designing, validating and testing
your application; (3) Ensuring your application meets applicable standards and any other safety, security orother requirements; (4) RUNIC and the RUNIC logo are registered trademarks of RUNIC INCORPORATED. All
trademarks are the property of their respective owners; (5) For change details, review the revision history
included in any revised document. The resources are subject to change without notice. Our company will not
be liable for the use of this product and the infringement of patents or third-party intellectual property rights due
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