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Product Detailed Parameters
- Description：IC VREF SHUNT 2.495V SOT23-3
- Series：-
- Mfr：Nexperia USA Inc.
- Package：Tape & Reel (TR)
- Output Type：Adjustable
- Voltage - Output (Min/Fixed)：2.495V
- Voltage - Output (Max)：36 V
- Current - Output：100 mA
- Operating Temperature：-40°C ~ 125°C (TA)
- Mounting Type：Surface Mount
- Package / Case：TO-236-3, SC-59, SOT-23-3
- Supplier Device Package：TO-236AB
- Grade：Automotive
- Qualification：AEC-Q100
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Overview
The TL431AFDT-QR is a three-terminal adjustable precision shunt regulator from the Nexperia TL431 family, designed for surface-mount applications in the TO-236AB (SOT-23) package. It features an A-grade reference voltage tolerance of 1.0% and operates within an ambient temperature range of -40°C to 125°C. The device provides a programmable output voltage ranging from the internal reference of 2.495 V up to 36 V, set by two external resistors. It supports a sink current capability between 1 mA and 100 mA with a typical output impedance of 0.2 Ω. This component holds AEC-Q101 qualification for automotive reliability.
Feature Summary
- AEC-Q101 qualified for automotive electronics environments
- Programmable output voltage up to 36 V via external resistors
- Low output noise and low output impedance
- Wide operating temperature range suitable for harsh conditions
Applications
- Shunt regulator circuits
- Precision current limiter designs
- Isolated feedback loops for Switch Mode Power Supplies (SMPS)
Procurement Notes
Verify the specific suffix 'QR' against the official Nexperia datasheet to confirm packaging details and availability status. Confirm that the AEC-Q101 qualification aligns with project requirements. Check for alternative grades if stricter tolerance or different temperature ranges are needed. Ensure the TO-236AB footprint matches the PCB layout constraints.
Selection Notes
Select this part when a 1.0% reference voltage tolerance is required alongside extended high-temperature operation up to 125°C. The mirrored pinning configuration of the MFDT variant must be verified against schematic requirements. Consider the B-grade (0.5%) or C-grade (2.0%) variants if cost or specific tolerance levels differ from the A-grade specification.
Part Context
This component belongs to the widely used TL431 family of adjustable precision shunt regulators. It serves as a direct replacement for legacy Zener diodes in many linear regulation contexts. The device integrates a bandgap reference, error amplifier, and output transistor into a compact SMD package, enabling precise voltage control in power management systems.
Replacement Considerations
Compatible substitutes include the TL431AMFDT for standard non-automotive use and the TL431AQDBZR for automotive applications with normal pinning. Verify pinout compatibility, as the MFDT series utilizes mirrored pinning compared to the DBZR series.
