TL431 Programmable Precision References
The TL431 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 Vref to
36 volts with two external resistors. These devices
exhibit a wide operating current range of 1.0 to 100mA
with a typical dynamic impedance of 0.22
Ω.
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 volt reference makes it
convenient to obtain a stable reference from 5.0 volt
logic supplies, and since the TL431 operates as a shunt
regulator, it can be used as either a positive or negative
voltage reference.
FEATURES
l
Programmable Output Voltage to 36 Volts
l
Low Dynamic Output Impedance, 0.22
Ω
Typical
l
Sink Current Capability of 1.0 to 100 mA
l
Equivalent Full-Range Temperature Coefficient of
50 ppm/
o
C Typical
l
Temperature Compensated for operation over
Full Rated Operating Temperature Range
l
Low Output Noise Voltage
PIN ARRANGEMENT
TO-92
DIP-8
Pin: 1. Reference
2. Anode
3. Cathode
Pin: 1. Cathode
6. Anode
8. Reference
Other Pins: NC
SOP-8
CIRCUIT SCHEMATIC
Pin: 1.
2.
3.
4.
Cathode
Anode
Reference
NC
5.
6.
7.
8.
NC
Anode
Anode
Reference
SYMBOL
FUNCTIONAL BLOCK DIAGRAM
This SOP-8 is an internally modified SOP-8 Package.
Pins 2, 3, 6 and 7 are electrically common to the die
attach flag. This internal lead frame modification
decreases package thermal resistance and increases
power dissipation capability when appropriately
mounted on a printed circuit board. This SOP-8
conforms to all external dimensions of the standard
SOP-8 package.
ORDERING INFORMATION
Device
TL431CT
TL431CD
TL431CS
TL431IT
TL431ID
TL431IS
Temperature
Range
0 to +70
o
C
Package
TO-92
DIP-8
SOP-8
TO-92
DIP-8
SOP-8
-40 to +85
o
C
9-1
FCI [ FIRST COMPONENTS INTERNATIONAL ]
