AS431ARTR-E1

Overview

The AS431ARTR-E1 is a three-terminal adjustable precision shunt regulator manufactured by Diodes Incorporated. It operates within a cathode voltage range of VREF to 36V and supports a sink current capacity from 1mA to 100mA. The device features a typical reference voltage deviation of 4.5mV over the full temperature range and maintains a low equivalent full-range temperature coefficient of 20PPM/°C. It utilizes an SOT89 surface-mount package with Tape & Reel packaging and offers a 0.5% voltage tolerance.

Feature Summary

• Provides programmable precise output voltage between 2.5V and 36V
• Ensures high stability under capacitive load conditions
• Features sharp turn-on characteristics and low output impedance

Applications

• Switching power supply regulation
• Charger circuit design
• Voltage adapter applications
• Graphic card power management
• Precision voltage reference circuits

Procurement Notes

Verify that the ordering suffix E1 corresponds to RoHS compliance and lead-free status as defined in the manufacturer's documentation. Confirm the specific package variant matches the required SOT89 footprint and pinout configuration for the target PCB layout. Ensure the component status aligns with long-term availability requirements, noting any recommended alternatives if the part is not recommended for new designs.

Selection Notes

Select this component when a low-impedance, adjustable shunt regulator is required to replace Zener diodes in precision applications. Consider the SOT89 package for its thermal dissipation capabilities relative to smaller packages. Evaluate the 0.5% initial accuracy against system tolerance requirements. Verify compatibility with operating temperatures ranging from -40°C to +125°C.

Part Context

The AS431 series consists of three-terminal adjustable shunt regulators designed for thermal stability across a wide operating range. This family serves as a direct substitute for Zener diodes in various power management topologies. The AS431ARTR-E1 specifically denotes the SOT89 package variant with 0.5% tolerance and standard lead-free manufacturing specifications.

Replacement Considerations

AS431ARTR-G1 is listed as a parameter-equivalent alternative offering Green molding compound compliance.