TL431BCDE4

Overview

The TL431BCDE4 is a precision adjustable shunt regulator from Texas Instruments, housed in an SOIC-8 surface-mount package. It provides an output voltage range of 2.495V to 36V with an initial accuracy tolerance of ±0.5%. The device supports a maximum cathode current of 100 mA and operates within a commercial temperature range of 0°C to 70°C. It features a typical dynamic impedance of 0.2 ohms and a maximum input voltage rating of 37V.

Feature Summary

• Offers high-precision voltage regulation with a tight initial tolerance of ±0.5% at 25°C.
• Provides wide programmable output voltage capability ranging from the internal reference level up to 36V.
• Delivers robust current handling with a maximum sink capability of 100 mA for stable load regulation.

Applications

• Precision voltage references in power supply circuits
• Programmable linear regulators
• Comparator applications requiring accurate threshold levels

Procurement Notes

Verify that the suffix E4 indicates compliance with RoHS standards and absence of halogen substances. Confirm the SOIC-8 package designation matches the target PCB footprint requirements. Ensure the BC grade selection aligns with the required ±0.5% accuracy specification for the design. Check for any specific automotive or military qualification needs if operating outside the standard commercial temperature range.

Selection Notes

Select this component when a low-cost, high-accuracy shunt regulator is required for commercial temperature environments. The SOIC-8 package facilitates automated surface-mount assembly. Consider the 100 mA current limit when designing feedback networks. For wider temperature ranges, alternative grades such as I or Q series should be evaluated instead.

Part Context

This part belongs to the widely adopted TL431 family of programmable reference sources. It serves as a direct replacement for traditional Zener diodes in many control loop applications. The DE4 suffix specifically denotes the lead-free and RoHS-compliant variant of the standard TL431BCD device, ensuring environmental regulatory compliance for modern electronics manufacturing.

Replacement Considerations

Compatible substitutes include the TL431ACD and TL431IDRE4. Verify that substitute parts match the required accuracy grade and operating temperature range before implementation.