
TS432/432A/432B
Adjustable Precision Shunt Regulator
Sink Current Capability up to 100mA
General Description
The TS432/432A/432B is a three-terminal adjustable shunt regulator with specified thermal stability. The output voltage
may be set to any value between Vref (approximately 1.24V) and 18V with two external resistors. The TS432/432A/432B
has a typical output impedance of 0.2Ω. Active output circuitry provides a very sharp turn-on characteristic, making the
TS432/432A/432B excellent replacement for zener diode in many applications.
This series is offered in 3-pin TO-92, SOT-89, SOT-23 and 5-pin SOT-25 package.
Features
Precision Reference Voltage
TS432 1.24V±2%
TS432A 1.24V±1%
TS432B 1.24V±0.5%
Minimum Cathode Current for regulation: 150uA(typ)
Equivalent Full Range Temp. Coefficient: 50ppm/
Programmable Output Voltage up to 18V
Fast Turn-On Response
Sink Current Capability of 1.0 to 100 mA
Low Dynamic Output Impedance: 0.2Ω
Low Output Noise
Standard Application
o
C
Ordering Information
Block Diagram
TS432xCT TO-92
TS432xCY SOT-89
TS432xCX SOT-23
TS432xCX5
Note: Where x denotes voltage tolerance.
Blank: ±2%
B: ±0.5%
Part No. Operating Temp.
(Ambient)
o
-20 ~ +85
A: ±1%
C
Package
SOT-25
Pin Assignment
Pin No.
TS432/A/BCT TS432/A/BCY TS432/A/BCX TS432/A/BCX5
1 1 1 4 Reference
2 2 3 5 Anode
3 3 2 3 Cathode
1, 2 Non connect
TS432/A/B 1-7 2003/12 rev. A
Pin
Description

Absolute Maximum Rating
Cathode Voltage (Note 1) Vka 20 V
Continuous Cathode Current Range Ik -10 ~ 200 mA
Reference Input Current Range Iref 10 mA
Power Dissipation (Note 2, 3) TO-92
TO-89
SOT-23 / SOT-25
Operating Junction Temperature Range Tj 0 ~ +125
Storage Temperature Range T
Note 1: Voltage values are with respect to the anode terminal unless otherwise noted.
Note 2: Tj Max = 150
Note 3: Rating apply to ambient temperature at 25
o
C
oC
Pd
-65 ~ +150 oC
STG
0.625
0.5
0.3
W
o
C
Recommend Operating Condition
Cathode Voltage Range Vka Ref ~ 18 V
Cathode Current Range (for regulation) Ik 1 ~ 100 mA
Electrical Characteristics
(Ta=25 oC, unless otherwise specified.)
Parameter Symbo Test Conditions Min Typ Max Unit
Reference
voltage
Deviation of reference input
voltage, over temp. (Note 4)
Reference Input current Iref
Radio of change in Vref to
change in cathode Voltage
Deviation of reference input
current, over temp.
Minimum operating cathode
current
Off-state Cathode Current Ioff Vref=0V (Figure 3) Vka=18V -- 0.5 2.0 uA
Dynamic Output Impedance |Zka|
TS432
TS432A
TS432B
Vref
Vref
∆Vref /
∆Vka
Iref(DEV)
Ika(min) Vka=Vref (Figure 1) -- 60 200 uA
Vka =Vref, Ik=10mA (Figure 1)
Ta = full range
Vka =Vref, Ik=10mA (Figure 1)
R1=10KΩ, R2=
(Figure 2)
Ika=10mA, Vka = 18V to Vref
(Figure 2)
Ta= full range
R1=10KΩ, R2=
(Figure 2)
f<1KHz, Vka=Vref
Ika=100uA to 15mA (Figure 1)
, Ika=10mA
, Ika=10mA
1.215
1.227
1.233
-- 5 20 mV
-- 0.15 4.0 uA
-- -1.0 -2.7 mV/V
-- 0.1 4.0 uA
-- 0.2 0.5 Ω
1.240
1.264
1.252
1.246
V
TS432/A/B 2-7 2003/12 rev. A

Note 4. Deviation of reference input voltage, VDEV, is defined as the maximum deviation of the reference over the full
temperature range.
The average temperature coefficient of the reference input voltage αVref is defined as:
| αVref | = [ V
Where: T2-T1 = full temperature change.
αVref can be positive or negative depending on whether the slope is positive or negative.
Note 5. The dynamic output impedance, Rz, is defined as:
/ Vref(25) ] * 106 / T2 – T1…………………….. (PPM/
DEV
o
C)
| Zka | = ∆Vka / ∆Ika
When the device is programmed with two external resistors R1and R2 (see Figure 2). The dynamic output
impedance of the overall circuit, is defined as :
| Zka | = ∆v / ∆i | ≈ Zka | * ( 1 + R1 / R2)
Test Circuits
TS432/A/B 3-7 2003/12 rev. A

Application Examples
TS432/A/B 4-7 2003/12 rev. A

Typical Performance Characteristics
TS432/A/B 5-7 2003/12 rev. A

TO-92 Mechanical Drawing
A
TO-92 DIMENSION
DIM
B
C
E F
A 4.30 4.70 0.169 0.185
B 4.30 4.70 0.169 0.185
C 14.30(typ) 0.563(typ)
D 0.43 0.49 0.017 0.019
E 2.19 2.81 0.086 0.111
F 3.30 3.70 0.130 0.146
G 2.42 2.66 0.095 0.105
H 0.37 0.43 0.015 0.017
MILLIMETERS INCHES
MIN MAX MIN MAX
H
H
G
D
SOT-89 Mechanical Drawing
A
B
G
E
F
D
I
C
J
DIM
A 4.40 4.60 0.173 0.181
B 1.50 1.7 0.059 0.070
C 2.30 2.60 0.090 0.102
D 0.40 0.52 0.016 0.020
E 1.50 1.50 0.059 0.059
F 3.00 3.00 0.118 0.118
G 0.89 1.20 0.035 0.047
H 4.05 4.25 0.159 0.167
I 1.4 1.6 0.055 0.068
J 0.35 0.44 0.014 0.017
SOT-89 DIMENSION
MILLIMETERS INCHES
MIN MAX MIN MAX
TS432/A/B 6-7 2003/12 rev. A

SOT-23 Mechanical Drawing
A
B
F
SOT-23 DIMENSION
DIM
A 2.88 2.91 0.113 0.115
E
G
D
C
B 0.39 0.42 0.015 0.017
C 1.78 2.03 0.070 0.080
D 0.51 0.61 0.020 0.024
E 1.59 1.66 0.063 0.065
F 1.04 1.08 0.041 0.043
G 0.07 0.09 0.003 0.004
MILLIMETERS INCHES
MIN MAX MIN MAX
SOT-25 Mechanical Drawing
SOT-23 DIMENSION
DIM
A 2.70 3.00 0.106 0.118
B 0.25 0.50 0.010 0.020
C 1.90(typ) 0.075(typ)
D 0.95(typ) 0.037(typ)
E 1.50 1.70 0.059 0.067
F 1.05 1.35 0.041 0.053
H 2.60 3.00 0.102 0.118
L 0.60(typ) 0.024(typ)
MILLIMETERS INCHES
MIN MAX MIN MAX
TS432/A/B 7-7 2003/12 rev. A