The AS432 is a three terminal adjustable shunt regulator utilizing an accurate 1.24V bandgap reference. The AS432 is functionally similar to an AS431 except for its lower reference voltage, making it usable in a wide variety of low voltage applications. Because of its robust bipolar technology, the AS432 handles a wide range of current, and holds off more than 18V so its use is not limited to low power, low voltage systems. Significant care has been taken to provide adequate AC bandwidth to allow the AS432 as an amplifier in control systems and power electronics.
The AS432 is a three‑terminal adjustable shunt regulator that uses an accurate 1.24 V bandgap reference. It offers 0.25 %‑2.0 % bandgap tolerance, an internal amplifier capable of 150 mA, and low‑frequency dynamic output impedance below 150 mΩ. The device is designed for low‑voltage applications but can handle up to 18 V reverse breakdown and operates over a wide temperature range.
The datasheet provides absolute maximum ratings, recommended operating conditions, pin configurations for various packages (TO‑92, SOIC, SOT‑23, SOT‑89), and typical performance curves including voltage regulation, noise, and pulse response.
| Reference Voltage | 1.24 V |
|---|---|
| Temperature Coefficient | 50 ppm/°C |
| Bandgap Tolerance | 0.25 %‑2.0 % |
| Internal Amplifier Current Capability | 150 mA |
| Cathode‑Anode Reverse Breakdown Voltage | 18 V |
| Reference Input Current | 1 mA |
| Power Dissipation (TO‑92) | 775 mW |
The AS432 provides a 1.24 V precision reference voltage.
The device can tolerate up to 18 V reverse breakdown between cathode and anode.
The reference input current is specified as 1 mA.