TL431AMFDT-QR

Overview

The TL431AMFDT-QR is an adjustable precision shunt voltage reference from Nexperia, housed in a SOT-23 (TO-236AB) surface-mount package. It provides a nominal reference voltage of 2.495 V with a tight tolerance of ±1%. The device supports programmable output voltages up to 36 V using two external resistors and operates within an ambient temperature range of -40°C to 125°C. Qualified under AEC-Q101 standards for automotive applications, it features low output noise and a typical output impedance of 0.2 Ω, supporting sink currents from 1 mA to 100 mA.

Feature Summary

• AEC-Q101 qualified for automotive reliability requirements
• Adjustable output voltage ranging from 2.495 V to 36 V
• High precision with ±1% reference voltage tolerance
• Low output noise and stable performance across wide temperature ranges

Applications

• Isolated feedback loops for Switch Mode Power Supplies (SMPS)
• Precision current limiters
• Precision constant current sinks
• Shunt regulators in industrial control systems

Procurement Notes

Verify component authenticity through authorized Nexperia distributors or certified supply chain partners. Confirm the presence of valid AEC-Q101 certification documentation and traceability records prior to integration. Ensure storage conditions comply with moisture sensitivity level specifications to prevent package degradation. Cross-reference ordering suffixes to confirm pinning configuration matches design requirements.

Selection Notes

Select this component when high accuracy and automotive qualification are required. The ±1% tolerance suits precision analog circuits where standard grades are insufficient. Consider the mirrored pinning option if board layout constraints differ from standard configurations. Evaluate thermal management needs given the 125°C operating limit and ensure external resistor selection allows for the desired output voltage range without exceeding current limits.

Part Context

This part belongs to the TL431 family of three-terminal shunt regulators, widely used for voltage referencing and feedback control. The 'AM' designation indicates the specific grade offering 1% tolerance and extended temperature capability compared to standard variants. The 'QR' suffix typically denotes automotive-grade qualification and specific packaging formats intended for high-reliability environments.

Replacement Considerations

Compatible substitutes include TL431AQDBZR and TL431AFDT, which share similar electrical characteristics and pinout configurations. Verify that alternative parts match the required AEC-Q101 qualification status and temperature range. Check for any differences in pinning orientation, such as mirrored versus normal pinning, to ensure mechanical compatibility during replacement.