AS431BRTR-G1

Overview

The AS431BRTR-G1 is an adjustable precision shunt regulator manufactured by Diodes Incorporated, housed in a SOT-89-3 surface-mount package. It provides programmable output voltages ranging from 2.5V to 36V with a guaranteed initial accuracy of ±1%. The device features a typical temperature coefficient of 20PPM/°C and supports a cathode current range from 1mA to 100mA. It operates within an ambient temperature range of -40°C to +125°C and includes RoHS compliance.

Feature Summary

• Offers sharp turn-on characteristics and high stability under capacitive loads
• Provides low equivalent full-range temperature deviation for precise regulation
• Features low output impedance and low output noise performance
• Complies with lead-free and green molding compound standards

Applications

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

Procurement Notes

Verify the specific ordering suffix G1 confirms RoHS compliance and halogen-free status as defined by the manufacturer. Confirm the SOT-89-3 package variant matches the required thermal resistance and pin configuration for the target PCB layout. Ensure the 1% tolerance rating aligns with the circuit's reference voltage requirements before finalizing procurement orders.

Selection Notes

Select this component when a stable, adjustable shunt reference is needed between 2.5V and 36V. The 1% tolerance suits applications requiring moderate precision without the cost of tighter grades. Verify that the maximum cathode voltage of 36V exceeds the system's operating potential and that the 100mA sink capacity meets load current demands across the specified temperature range.

Part Context

This part belongs to the AS431 series of three-terminal adjustable shunt regulators designed to replace Zener diodes in various power management circuits. The BRTR-G1 designation indicates a 1% voltage tolerance version packaged in SOT-89-3 tape and reel format. It serves as a core voltage reference element within broader power supply and regulation subsystems.

Replacement Considerations

• AS431ARTR-G1 (0.5% tolerance)

FAQ

What is the minimum cathode current required for regulation?

The minimum cathode current for regulation is typically 1mA at VKA = VREF.

Is the AS431BRTR-G1 suitable for operation under heavy capacitive loads?

Yes, the device features high stability under capacitive loads, ensuring reliable performance without oscillation.