The AP431/AP431A are 3-terminal adjustable precision shunt regulators with guaranteed temperature stability and an extended commercial temperature range. The output voltage can be set to 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 0.2Ω. 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 variable resistors.
The document provides technical specifications for the AP431 and AP431A series of 3-terminal adjustable precision shunt regulators. These devices offer guaranteed temperature stability over an extended commercial range and allow the output voltage to be set between 2.495V and 36V using two external resistors.
| Reference Voltage (AP431) | 2.495V + 1% |
|---|---|
| Reference Voltage (AP431A) | 2.495V + 0.5% |
| Sink Current Capability | 200mA |
| Minimum Cathode Current for Regulation | 300uA |
| Programmable Output Voltage Range | 2.495V to 36V |
The device has a typical output impedance of 0.20 ohms.
Yes, these devices are excellent improved replacements for Zener diodes in many applications.
Available packages include TO92, SOT89, SOT23, SOT25 and SOP.