TL431BQD

Overview

The TL431BQD is an adjustable precision shunt regulator manufactured by Texas Instruments. It operates within a voltage range of 2.5 V to 36 V and provides an initial accuracy of ±0.5%. The device features a maximum output current of 100 mA and a temperature coefficient of 92 ppm/°C. It supports a maximum input voltage of 37 V and functions within a temperature range of -40°C to 125°C. Packaged in a surface-mount SOT-23-5 configuration with three active pins, it serves as a high-performance reference for power management applications.

Feature Summary

• Provides adjustable precision shunt regulation with high initial accuracy
• Supports wide operating temperature range suitable for industrial environments
• Features low temperature coefficient for stable reference performance

Applications

• Precision voltage references in power supply circuits
• Feedback control loops in switching regulators
• Comparator reference sources in analog signal processing

Procurement Notes

Verify the specific suffix (e.g., QDBVR, QDBVT) for tape and reel packaging details when ordering. Confirm RoHS compliance status and lead times directly with authorized distributors. Ensure the selected variant matches the required thermal and electrical specifications for the target application environment.

Selection Notes

Select this component when ±0.5% initial accuracy is required over a wide temperature range. Compare against standard TL431 variants if higher precision or automotive qualification is needed. Consider package size constraints and thermal dissipation requirements relative to the 100 mA output capability.

Part Context

This part belongs to the TL431 family of adjustable shunt regulators. It offers improved accuracy compared to standard versions while maintaining compatibility with common circuit topologies. The device is widely used in offline and DC-DC converters where precise voltage referencing is critical for regulation stability.

Replacement Considerations

Compatible substitutes include TL431BQDBVR and TL431BQDBVT. Verify pinout compatibility and electrical parameters before substitution.