AP431

Series VREF - Input Voltage (Min) :
Product : Voltage References
Topology : Shunt References
Maximum Operating Temperature : + 85 C
Initial Accuracy : 1 %
Series VREF - Input Voltage (Max) : 36 V
Reference Type : Adjustable
Package / Case : SOP-8
Average Temperature Coefficient (Typ) : 30 PPM / C
Packaging : Bulk
Shunt Current (Max) : 200 mA
Output Voltage : +/- 1 %


Features:

• Precision reference voltage
AP431 : 2.495V ± 1%
AP431A : 2.495V ± 0.5%
• Sink current capability: 200mA
• Minimum cathode current for regulation: 300A
• Equivalent full-range temp coefficient: 30 ppm/oC
• Fast turn-on response
• Low dynamic output impedance: 0.2
• Programmable output voltage to 36v
• Low output noise.
• Packages: TO92, SOT89, SOT23, SOT25 and SOP




Specifications

Cathode Voltage .....................................36V
Continuous Cathode Current ....................... -10mA ~ 250mA
Reference Input Current Range ........................ 10mA
Operating Temperature Range (AP431)...................- 20oC ~ 85oC
(AP431I).................... -40oC ~ 85oC
Lead Temperature............................... 260oC
Storage Temperature ............................ 65oC ~ 150oC
Power Dissipation (Notes 1. 2) SOT89 Package .............. 0. 80W
TO92 Package ................ .0.78W
SOT23 package ................ .0.25W
SOT25 Package...................0.25W
SOP Package.................. 0.6W

Part Number	AP431
Reference Voltage (V)	2.495
Accuracy (%)	1
Max Input Voltage (V)	36
Sink Current (mA)	250
Minimum Cathode Current for Regulation (uA) typ	190
Maximum Slope Resistance (Ohm's)	0.5
Operating Ambient Temp Range (°C)	-20 to +85

Description

The AP431/AP431A are 3-terminal adjustable precision shunt regulators with guaranteed temperature stability over the applicable extended commercial temperature range. The output voltage may be set at any level greater than 2.495V(VREF) up to 36V merely by selecting two external resistors that act as a voltage divider network. These devices have a typical output impedance of 0.2. Active output circuitry provides very sharp turn-on characteristics, making these devices excellent improved replacements for Zener diodes in many applications.

The precise (+/-) 1% Reference voltage tolerance of the AP431/431A make it possible in many applications to avoid the use of a variable resistor, consequently saving cost and eliminating drift and reliability problems associated with it.