AS431ANTR-G1

Overview

The AS431ANTR-G1 is a three-terminal adjustable precision shunt regulator manufactured by Diodes Incorporated. It provides programmable output voltage ranging from 2.5V to 36V with an initial accuracy of 0.5%. The device operates within a temperature range of -40°C to +125°C and features a typical low temperature deviation of 4.5mV. It supports a sink current capacity between 1mA and 100mA, ensuring stability under capacitive loads. Packaged in SOT-23 format on tape and reel, it serves as a precise reference for power management circuits.

Feature Summary

• Offers sharp turn-on characteristics and guaranteed thermal stability across the full operating temperature range.
• Provides high stability when driving capacitive loads without oscillation.
• Features low equivalent full-range temperature coefficient and low output impedance.
• Compliant with RoHS standards and utilizes halogen-free green molding compound.

Applications

• Switching power supplies
• Chargers
• Voltage adapters
• Graphic cards
• Precision voltage references

Procurement Notes

Verify that the ordering suffix G1 confirms compliance with RoHS directives and indicates the use of halogen-free green molding compounds. Confirm the package type matches the required SOT-23 footprint and ensure the 0.5% voltage tolerance grade aligns with circuit requirements. Check datasheet notes regarding moisture sensitivity levels and recommended storage conditions prior to assembly.

Selection Notes

Select this component when a precise, adjustable shunt regulator is needed with tight initial accuracy specifications. The 0.5% tolerance distinguishes it from standard 1.0% variants. Ensure the application requires operation within the specified cathode voltage limits and can accommodate the minimum cathode current necessary for regulation. Consider thermal resistance values if high power dissipation is anticipated.

Part Context

This part belongs to the AS431 family of adjustable precision shunt regulators designed to replace Zener diodes in various applications. It shares functional similarities with industry-standard 431 devices but offers specific performance metrics such as improved temperature stability. The product line includes multiple package options and tolerance grades to suit diverse design constraints.

Replacement Considerations

The datasheet identifies AS431ANTR-E1 as an alternative variant offering lead-free construction instead of green molding. Designers should verify pin compatibility and electrical parameter equivalence before substituting components.

FAQ

What is the minimum cathode current required for regulation?

The minimum cathode current for regulation is typically 0.4mA and must not exceed 1.0mA at the reference voltage.

How does the device handle capacitive loads?

The AS431 is designed to maintain high stability under capacitive loads, preventing oscillation within specified boundary conditions.