1
ASTEC Semiconductor
AS1431
Precision Adjustable Shunt Reference
Features
¥
Temperature-compensated: 30 ppm/¡C
¥
Trimmed 0.4% bandgap reference
¥
Internal amplifier with 150 mA capability
¥
Temperature range: Extended to Ð55
to125¡C
¥
Low frequency dynamic output
impedance: < 150 m½
¥
Low output noise
¥
Robust ESD protection
Description
The AS1431 is a three-terminal adjustable shunt regulator providing a
highly accurate 0.4% bandgap reference. The adjustable shunt regulator
is ideal for a wide variety of linear applications that can be implemented
using external components to obtain adjustable currents and voltages.
In the standard shunt configuration, the combination of low temperature
coefficient (TC), sharp turn-on characteristics, low output impedance and
programmable output voltage make this precision reference a perfect
zener diode replacement.
The AS1431 is characterized to operate over the full automotive tem-
perature range of Ð55 to 125¡C and is now available in the SOT-23 (5L)
package.
SEMICONDUCTOR
Pin Configuration Ñ Top view
Ordering Information
CATHODE
TO-92 (LP) SOIC (D)
ANODE
REFERENCE
CATHODE
REFERENCE
ANODE
ANODE
N/C
CATHODE
ANODE
ANODE
N/C
SOT-89 (S)
SOT-23/5L (DBV)
ANODE
REFERENCE
1
2
3
4
8
7
6
5
REFERENCE
ANODE
N/C
N/C
CATHODE
Circuit Type:
Precision Adjustable
Shunt Regulator
Temperature Range:
D = –55°C to +125°C
Bandgap Tolerance:
R4 = – 0.4%
AS1431 D R4 D 7
Packaging Option:
A
B
T
7
13
Package Style:
D
DBV
LP
S
= SOIC
= SOT-23/5L
= TO-92
= SOT-89
= Ammo Pack
= Bulk
= Tube
= Tape and Reel (7" Reel Dia)
= Tape and Reel (13" Reel Dia)