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1
FEATURES
LP PACKAGE
(TOPVIEW)
CATHODE
ANODE
REF
FK PACKAGE
(TOPVIEW)
3 2 1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
NC
NC
NC
ANODE
NC
NC
NC
NC
NC
NC
NC
CATHODE
NC
NC
NC
REF
NC
NC
NC
NC
1
2
3
4
8
7
6
5
CATHODE
ANODE
ANODE
NC
REF
ANODE
ANODE
NC
D PACKAGE
(TOPVIEW)
NC – No internal connection
ANODE terminals are connected internally
.
1
2
3
4
8
7
6
5
CATHODE
NC
NC
NC
REF
NC
ANODE
NC
JG OR PW PACKAGE
(TOPVIEW)
NC – No internal connection
KTP PACKAGE
(TOPVIEW)
CATHODE
ANODE
REF
ANODE
DESCRIPTION/ORDERING INFORMATION
TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062L – DECEMBER 1991 – REVISED OCTOBER 2007
www.ti.com
2
• 0.4% Initial Voltage Tolerance • Sink Current Capability … 1 mA to 100 mA
• 0.2- Ω Typical Output Impedance • Low Reference Current (REF)
• Fast Turnon … 500 ns • Adjustable Output Voltage … V
I(ref)
to 36 V
The TL1431 is a precision programmable reference with specified thermal stability over automotive, commercial,
and military temperature ranges. The output voltage can be set to any value between V
I(ref)
(approximately 2.5 V)
and 36 V with two external resistors (see Figure 16 ). This device has a typical output impedance of 0.2 Ω . Active
output circuitry provides a very sharp turnon characteristic, making the device an excellent replacement for Zener
diodes and other types of references in applications such as onboard regulation, adjustable power supplies, and
switching power supplies.
The TL1431C is characterized for operation over the commercial temperature range of 0 ° C to 70 ° C. The
TL1431Q is characterized for operation over the full automotive temperature range of – 40 ° C to 125 ° C. The
TL1431M is characterized for operation over the full military temperature range of – 55 ° C to 125 ° C.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2 PowerFLEX is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Copyright © 1991 – 2007, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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