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© Semiconductor Components Industries, LLC, 2009
April, 2009 − Rev. 29
1 Publication Order Number:
TL431/D
TL431, A, B Series,
NCV431A, B
Programmable
Precision References
The TL431, A, B 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 V
ref
to 36 V with two external resistors. These
devices exhibit a wide operating current range of 1.0 mA to 100 mA
with a typical dynamic impedance of 0.22 W. 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 2.5 V reference makes it convenient to obtain a
stable reference from 5.0 V logic supplies, and since the TL431, A, B
operates as a shunt regulator, it can be used as either a positive or
negative voltage reference.
Features
• Programmable Output Voltage to 36 V
• Voltage Reference Tolerance: ±0.4%, Typ @ 25°C (TL431B)
• Low Dynamic Output Impedance, 0.22 W Typical
• Sink Current Capability of 1.0 mA to 100 mA
• Equivalent Full−Range Temperature Coefficient of 50 ppm/°C Typical
• Temperature Compensated for Operation over Full Rated Operating
Temperature Range
• Low Output Noise Voltage
• Pb−Free Packages are Available
(Top View)
3
1
Reference
N/C
N/C
N/C
2
4
8
7
6
5
N/C
Anode
N/C
Cathode
Anode Anode
TO−92 (TO−226)
LP SUFFIX
CASE 29
PDIP−8
P SUFFIX
CASE 626
SOIC−8
D SUFFIX
CASE 751
Pin 1. Reference
2. Anode
3. Cathode
(Top View)
3
1
Reference
N/C
2
4
8
7
6
5
N/C
Cathode
Micro8E
DM SUFFIX
CASE 846A
8
1
8
1
8
1
1
2
3
This is an internally modified SOIC−8 package. Pins 2, 3, 6 and
7 are electrically common to the die attach flag. This internal
lead frame modification increases power dissipation capability
when appropriately mounted on a printed circuit board. This
modified package conforms to all external dimensions of the
standard SOIC−8 package.
http://onsemi.com
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
ORDERING INFORMATION
See general marking information in the device marking
section on page 16 of this data sheet.
DEVICE MARKING INFORMATION
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