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Is Now Part of
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of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right
to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON
Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON
Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s
technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA
Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended
or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, afliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out
of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor
is an Equal Opportunity/Afrmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
©2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.4
Features
Programmable Output Voltage to 36 Volts
Low Dynamic Outpu t Impedance 0.2Ω Typical
Sink Current Capability of 1.0 to 100mA
Equivalent Full-Range Temperature Coefficient of
50ppm/°C Typical
Temperature Compensated For Operation Over Full Rated
Operating Temperature Range
Low Output Noise Voltage
Fast Turn-on Response
Description
The TL431/TL431A are three-terminal adjustable regulator
series with a guaranteed thermal stability over applicable
temperature ranges. The output voltage may be set to any
value between VREF (appro ximately 2.5 volts) and 36 volts
with two external resistors These devices have a typical
dynamic output impedance of 0.2Ω. Active output circuitry
provides a very sharp turn-on characteristic, making these
devices excel lent replacement for zener diodes in many
applications.
TO-92
8-DIP
8-SOP
1. Ref 2. Anode 3. Cathode
1. Cathode 2. 3. 6. 7. Anode
8. Ref 4. 5. NC
1
1
1
1.Cathode 2.3.4.5.7.NC
6.Anode 8.Ref
TL431/TL431A
Programmable Shunt Regulator
TL431/TL431A
2
Internal Block Diagram
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified.)
Recommended Operating Conditions
Parameter Symbol Value Unit
Cathode Volt ag e VKA 37 V
Cathode Current Range (Continuous) IKA -100 ~ +150 mA
Reference Input Current Range IREF -0.05 ~ +10 mA
Power Dissipation
D, LP Suffix Package
P Suffix Package PD770
1000 mW
mW
Operating Temperature Range TOPR -25 ~ +85 °C
Junction Temperature TJ150 °C
Storage Temperature Range TSTG -65 ~ +150 °C
Parameter Symbol Min Typ Max Unit
Cathode Volt ag e VKA VREF -36V
Cathode Curr en t IKA 1.0 - 100 mA
+
-
TL431/TL431A
3
Electrical Characteristics
(TA = +25°C, unless otherwise specified)
•T
MIN= -25 °C, TMAX= +85 °C
Parameter Symbol Conditions TL431 TL431A Unit
Min. Typ. Max. Min. Typ. Max.
Reference Input Voltage VREF VKA=VREF, IKA=10mA 2.440 2.495 2.550 2.470 2.495 2.520 V
Deviation of Reference
Input Voltage Over-
Temperature (Note 1)
ΔVREF/
ΔTVKA=VREF, IKA=10mA
TMINTATMAX -4.517 -4.517mV
Ratio of Change in
Reference Input Voltage
to the Change in
Cathode Voltage
ΔVREF/
ΔVKA IKA
=10mA
ΔVKA=10V-
VREF - - 1.0 -2.7 - -1.0 -2.7 mV/V
ΔVKA=36V-
10V - -0.5 -2.0 - -0.5 -2.0
Reference Input Current IREF IKA=10mA,
R1=10KΩ,R2=-1.54 -1.54μA
Deviation of Reference
Input Current Over Full
Temperature Range ΔIREF/ΔTIKA=10mA,
R1=10KΩ,R2=
TA =Full Range - 0.4 1.2 - 0.4 1.2 μA
Minimum Cathode Cur-
rent for Regulation IKA(MIN) VKA=VREF - 0.45 1.0 - 0.45 1.0 mA
Off - Stage Cathode
Current IKA(OFF) VKA=36V, VREF=0 - 0.05 1.0 - 0.05 1.0 μA
Dynamic Impedance
(Note 2) ZKA VKA=VREF,
IKA=1 to 100mA
f 1.0KHz - 0.15 0.5 - 0.15 0.5 Ω
TL431/TL431A
4
Test Circuits
Figure 1. Test Circuit for VKA=VREF Figure 2. Test Circuit for VKAVREF
TL431/A TL431/A
TL431/A
Figure 3. Test Circuit for lKA(OFF)
TL431/TL431A
5
Typical Perfomance Characteristics
Figure 1. Cathode Current vs. Cathode Volta ge
Figure 3. Change In Reference Inpu t Voltage vs.
Cathode Voltage
Figure 5. Small Signal Voltage Amplification vs. Frequency
Figure 2. Cathode Current vs. Cath ode Voltage
Figure 4. Dyna mi c Impedance Frequency
Figure 6. Pulse Response
TL431/TL431A
6
Typical Application
Figure 10. Shunt Regulator Figure 11. Output Control for Three-
Termianl Fi xed Regulator Figure 12. High Current Shunt Regula-
tor
Figure 13. Current Limit or Current Source Figure 14. Constant-Current Sink
VO1R1
R2
-------
+
⎝⎠
⎛⎞
Vref
=
TL431/A
VOVref 1R1
R2
-------
+
⎝⎠
⎛⎞
=
TL431/A
MC7805/LM7805
VO1R1
R2
-------
+
⎝⎠
⎛⎞
Vref
=
TL431/A
TL431/A TL431/A
TL431/TL431A
7
Mechanical Dimensions
Package
0.46
±0.10
1.27TYP
(R2.29)
3.86MAX
[1.27
±0.20
]1.27TYP
[1.27
±0.20
]
3.60
±0.20
14.47
±0.40
1
.02
±0.10
(0.25) 4.58
±0.20
4.58
+0.25
–0.15
0.38
+0.1
0
–0.0
5
0.38
+0.10
–0.05
TO-92
TL431/TL431A
8
Mechanical Dimensions (Continued)
Package
6.40 ±0.20
3.30 ±0.30
0.130 ±0.012
3.40 ±0.20
0.134 ±0.008
#
1
#
4#5
#8
0.252 ±0.008
9.20 ±0.20
0.79
2.54
0.100
0.031
(
)
0.46 ±0.10
0.018 ±0.004
0.060 ±0.004
1.524 ±0.10
0.362 ±0.008
9.60
0.378 MAX
5.08
0.200
0.33
0.013
7.62
0~15°
0.300
MAX
MIN
0.25
+0.10
–0.05
0.010
+0.004
–0.002
8-DIP
TL431/TL431A
9
Mechanical Dimensions (Continued)
Package
4.92 ±0.20
0.194 ±0.008
0.41 ±0.10
0.016 ±0.004
1.27
0.050
5.72
0.225
1.55 ±0.20
0.061 ±0.008
0.1~0.25
0.004~0.001
6.00 ±0.30
0.236 ±0.012
3.95 ±0.20
0.156 ±0.008
0.50 ±0.20
0.020 ±0.008
5.13
0.202 MAX
#1
#4 #5
0~8°
#8
0.56
0.022
()
1.80
0.071
MAX0.10
MAX0.004
MAX
MIN
+
0.10
-0.05
0.15+
0.004
-0.002
0.006
8-SOP
TL431/TL431A
2/22/11 0.0m 001
Stock#DS400301
© 2011 Fairchild Semiconductor Corporation
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATEN T RIGHTS, NOR THE RIGHTS OF OTHERS.
Ordering Information
Product Number Output Voltage Tolerance Package Operating Temperature
TL431ACLP 1% TO-92
-25 ~ + 85oC
TL431ACD 8-SOP
TL431CLP 2% TO-92
TL431CP 8-DIP
TL431CD 8-SOP
www.onsemi.com
1
ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.
ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent
coverage may be accessed at www.onsemi.com/site/pdf/PatentMarking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.
ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,
regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer
application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not
designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification
in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized
application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and
expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such
claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This
literature is subject to all applicable copyright laws and is not for resale in any manner.
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