TL431SQ/TL431ASQ
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
SOT-89
1:Reference
2:Anode
3:Cathode
Fast turn on response
Marking: TL431SQ: TL431
TL431ASQ: TL431A
Application
It provides very wide applications, including shunt
regulator, series regulator, switching regulator,
voltage reference and others.
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
770
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
www.pingjingsemi.com
Revision:1.0 Jun-2018
1/4
TL431SQ/TL431ASQ
Programmable Precision Reference
Electrical Characteristics (Ta=25℃ unless otherwise specified)
Symbol
VREF
∆VREF
∆VREF
∆VKA
IREF
∆IREF
Parameter
Reference Input Voltage
Deviation of Reference Input Voltage
Over Temperature
Ratio of Change in Reference Input Voltage to
the Change in Cathode Voltage
2.44
2.495
2.55
V
TL431ASQ
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,
-40°C ≤TA≤+85°C
IKA=10mA
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
www.pingjingsemi.com
Revision:1.0 Jun-2018
Min. Typ. Max. Unit
TL431SQ
VKA=VREF, IKA=10mA
Reference Input Current
IKA(MIN)
ZKA
Test Conditions
-25°C ≤TA≤+85°C
2/4
TL431SQ/TL431ASQ
Programmable Precision Reference
Typical Characteristic Curves
Cathode Current vs. Cathode Voltage
Change In Reference Input Voltage (mV)
Cathode Current (μA)
TA=25°C
125 V =V
KA
REF
100
75
50
25
0
-25
-50
-75
-100
-2
0
-5
-1
2
0
1
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
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
3/4
TL431SQ/TL431ASQ
Programmable Precision Reference
Package Outline
SOT-89
Dimensions in mm
Ordering Information
Device
Package
Shipping
TL431SQ/TL431ASQ
SOT-89
1000PCS/Reel&Tape
www.pingjingsemi.com
Revision:1.0 Jun-2018
4/4
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