TL431/TL431A
Programmable Precision Reference
Features
Programmable output voltage to 36V.
Low dynamic output impedance.
Sink current capability of 1.0 to 100mA.
Low output noise voltage
Fast turn on response
SOT-23
Marking: TL431: 431
TL431A: 431A
Application
2:Cathode (K)
It provides very wide applications, including shunt
1:Reference (R)
regulator,series regulator,switching regulator,voltage
reference and others.
3:Anode(A)
Absolute Maximum Ratings (Ta=25℃ unless otherwise specified)
Symbol
Parameter
Rating
Units
37
V
VKA
Cathode Voltage
IKA
Cathode Current Range(Continuous)
-100 ~ +150
mA
IREF
Reference Input Current Range
-0.05 ~ +10
mA
PD
Power Dissipation
350
mW
TJ
Operating Junction
+150
°C
TOPR
Operating Ambient
-40 ~ +85
°C
TSTG
Storage Temperature
-65 ~ +150
°C
Recommended Operating Conditions
Symbol
Parameter
Min.
Typ.
Max.
Units
VKA
Cathode Voltage
VREF
-
36
V
IKA
Cathode Current
1
-
100
mA
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Revision:1.0 Jun-2018
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TL431/TL431A
Programmable Precision Reference
Electrical Characteristics (Ta=25℃ unless otherwise specified)
Symbol
VREF
∆VREF
∆VREF
∆VKA
IREF
∆IREF
Parameter
Reference Input Voltage
2.44
2.495
2.55
V
TL431A
2.48
2.495
2.51
V
4.5
17
mV
VKA=10V~VREF
-1.0
-2.7
mV/V
VKA=36V~10V
-0.5
-2.0
mV/V
1.5
4
µA
0.4
1.2
µA
VKA=VREF
0.45
1
mA
VKA=36V, VREF=0
0.05
1.0
µA
VKA=VREF, IKA=1~ 100mA,f≤1.0kHz
0.15
0.5
Ω
VKA=VREF,IKA=10mA,
Over Temperature
-40°C ≤TA≤+85°C
Ratio of Change in Reference Input Voltage to
the Change in Cathode Voltage
IKA=10mA
Reference Input Current
IKA=10mA, R1=10kΩ, R2=∞
Deviation of Reference Input Current Over Full
IKA=10mA, R1=10kΩ, R2=∞,
Temperature Range
Minimum Cathode Current for Regulation
IKA(OFF)
Off-State Cathode Current
Dynamic Impedance
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Revision:1.0 Jun-2018
Min. Typ. Max. Unit
TL431
VKA=VREF, IKA=10mA
Deviation of Reference Input Voltage
IKA(MIN)
ZKA
Test Conditions
-25°C ≤TA≤+85°C
2/4
TL431/TL431A
Programmable Precision Reference
Typical Characteristic Curves
Cathode Current vs. Cathode Voltage
Change In Reference Input Voltage (mV)
Cathode Current (μA)
75
50
25
0
-25
-50
-75
-100
-2
0
-5
-1
0
1
2
Cathode Voltage (V)
Change in Reference Input Voltage vs.
Cathode Voltage
IKA=10mA
TA=25°C
-25
-30
-35
15
20
25
30
Cathode Voltage (V)
www.pingjingsemi.com
Revision:1.0 Jun-2018
35
400
IKA(MIN
)
200
0
-1
0
1
2
Cathode Voltage (V)
3
Pulse Response
-20
10
600
7
-15
5
TA=25°C
VKA=VREF
-200
-2
3
-10
-40
0
Cathode Current vs. Cathode Voltage
800
TA=25°C
125 V =V
KA
REF
100
Input and Output Voltage (V)
Cathode Current (mA)
150
40
6
TA=25°C
5
4
3
2
1
0
-1
-1
0
1
2
3
4
Time (µs)
5
6
7
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TL431/TL431A
Programmable Precision Reference
Package Outline
SOT-23
0.8
Max.
A
0.900
1.025
1.150
A1
0.000
0.050
0.100
b
c
D
0.300
0.080
2.800
0.400
0.115
2.900
0.500
0.150
3.000
E
1.200
1.300
1.400
HE
2.250
2.400
2.550
e
1.800
1.900
2.000
0.550REF
L1
L
0.300
0.500
θ
0o
8o
2.2
Typ.
0.8
1.0
Min.
1.0
Dimensions in millimeter
Symbol
1.9
SOT-23 (TO-236)
Recommended soldering pad
Ordering Information
Device
Package
Shipping
TL431/TL431A
SOT-23
3000PCS/Reel&Tape
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Revision:1.0 Jun-2018
4/4
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