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TS431-Z PDF Datasheet - Taiwan Semiconductor

Part Number TS431-Z
Description Adjustable Precision Shunt Regulator
Manufacturers Taiwan Semiconductor 
Logo Taiwan Semiconductor Logo 
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TS431-Z datasheet, circuit
SOT-23
Pin Definition:
1. Reference
2. Cathode
3. Anode
TS431-Z
Adjustable Precision Shunt Regulator
General Description
TS431 integrated circuits are three-terminal programmable shunt regulator diodes. These monolithic IC voltage
references operate as a low temperature coefficient zener which is programmable from VREF to 36 volts with two
external resistors. These devices exhibit a wide operating current range to 250mA with a typical dynamic
impedance of 0.2. The characteristics of these references make them excellent replacements for zener diodes in
many applications such as digital voltmeters, power supplies, and op amp circuitry. The 2.495V reference makes it
convenient to obtain a stable reference from 5.0V logic supplies, and since The TS431 operates as a shunt
regulator, it can be used as either a positive or negative stage reference.
Features
Programmable Output Voltage up to 36V
Fast Turn-On Response
Sink Current Capability: 200mA
Low Dynamic Output Impedance: 0.2(Typ)
Min. Operating Cathode Current: 0.2mA (Typ)
Halogen Free
Block Diagram
Ordering Information
Part No.
Package
Packing
TS431ACX-Z RFG SOT-23
3Kpcs / 7” Reel
TS431BCX-Z RFG SOT-23
3Kpcs / 7” Reel
Note: TS431A – VREF 2.495V ±1%
TS431B – VREF 2.495V ±0.5%
“G” denotes for Halogen free products
Absolute Maximum Rating (Ta = 25oC unless otherwise noted)
Parameter
Symbol
Limit
Cathode Voltage
VKA 36
Continuous Cathode Current Range
IK +250
Reference Input Current Range
IREF 10
Power Dissipation
PD 0.25
Operating Temperature Range
TOPER
-20 ~ +85
Junction Temperature
TJ -40 ~ +125
Storage Temperature Range
TSTG
-40 ~ +125
Thermal Resistance Junction to Ambient
ӨJA 156
Note: ӨJA is measured with the PCB copper area of approximately 1 in2 (Multi-Layer)
Unit
V
mA
mA
W
oC
oC
oC
oC/W
1/10 Version: B11

1 page
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TS431-Z pdf, schematic
TS431-Z
Adjustable Precision Shunt Regulator
Electrical Characteristics (TA=25oC, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Reference
TS431A
voltage
TS431B
Deviation of reference input
voltage
Radio of change in Vref to
change in cathode Voltage
Reference Input current
Deviation of reference input
current, over temp.
VREF
VREF
VREF
/VKA
IREF
IREF
VKA =VREF, IK =10mA (Figure 1)
VKA = VREF, IK =10mA (Figure 1)
TA=-20~85oC
IKA =10mA, VKA = 10V to VREF
(Figure 2) VKA = 36V to 10V
R1=10K, R2= , IKA =10mA
(Figure 2)
R1=10K, R2= , IKA =10mA
TA=-20~85oC (Figure 2)
2.470
2.520
2.495
2.483
2.507
V
-- 6 20 mV
-- -1.2 -2.0
mV/V
-- -1.0 -2.0
-- 1.5 3.5 uA
-- 0.4 1.2 uA
Off-state Cathode Current
IKA (off) VREF =0V (Figure 3), VKA =36V
-- 0.1 1.0 uA
Dynamic Output Impedance
Minimum operating cathode
current
| ZKA | f<1KHz, VKA = VREF (Figure 1)
IKA (min) VKA = VREF (Figure 1)
-- 0.2 0.5
-- 0.2 0.5 mA
* The deviation parameters VREF and IREF are defined as difference between the maximum value and minimum
value obtained over the full operating ambient temperature range that applied.
* The average temperature coefficient of the
reference input voltage, αVREF is defined as:
Where: T2-T1 = full temperature change.
αVREF can be positive or negative depending on whether the slope is positive or negative.
Example: Maximum VREF=2.496V at 30oC, minimum VREF =2.492V at 0oC, VREF =2.495V at 25oC, T=70oC
αVREF | = [4mV / 2495mV] * 106 / 70oC 23ppm/oC
Because minimum VREF occurs at the lower temperature, the coefficient is positive.
* The dynamic impedance ZKA is defined as:
| ZKA | = VKA / IKA
* When the device operating with two external resistors, R1 and R2, (refer to Figure 2) the total dynamic impedance
of the circuit is given by:
| ZKA | = v / i | ZKA | * ( 1 + R1 / R2)
2/10 Version: B11

2 Page
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TS431-Z equivalent
Applications Examples (Continue)
TS431-Z
Adjustable Precision Shunt Regulator
Figure 10: TRIAC Crowbar
Vin Vout
<Vref V+
>Vref 0.74V
Figure 11: SCR Crowbar
Figure 12: Single-Supply Comparator with
Temperature-Compensated Threshold
Figure 13: Constant Current Sink
Figure 14: Delay Timer
5/10
Version: B11

5 Page
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TS431-Z diode, scr
TS431-Z
Adjustable Precision Shunt Regulator
SOT-23 Mechanical Drawing
SOT-23 DIMENSION
DIM
MILLIMETERS
MIN MAX
INCHES
MIN MAX.
A 0.95 BSC
0.037 BSC
A1 1.9 BSC
0.074 BSC
B 2.60 3.00 0.102 0.118
C 1.40 1.70 0.055 0.067
D 2.80 3.10 0.110 0.122
E 1.00 1.30 0.039 0.051
F 0.00 0.10 0.000 0.004
G 0.35 0.50 0.014 0.020
H 0.10 0.20 0.004 0.008
I 0.30 0.60 0.012 0.024
J 5º 10º 5º 10º
Marking Diagram
Rx = Device Code
R1 = TS431A (±1%)
R2 = TS431B (±0.5%)
Y = Year Code
A = 2010
1 = 2011
W = Week Code
01 ~ 26 (A~Z)
27 ~ 52 (a ~ z)
X = Internal ID Code
9/10 Version: B11

9 Page





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