TL431BID

Overview

The TL431BID is a three-terminal programmable shunt regulator diode from onsemi, housed in an SOIC-8 package. It operates as a low temperature coefficient Zener reference programmable from Vref to 36 V using two external resistors. The device supports a cathode current range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22 Ω. It features a voltage reference tolerance of ±0.4% at 25°C and an equivalent full-range temperature coefficient of 50 ppm/°C. The component functions within an operating ambient temperature range of -40°C to +85°C.

Feature Summary

• Programmable output voltage capability up to 36 V via external resistor divider
• Temperature compensated for stable operation across the full rated industrial temperature range
• Low dynamic output impedance ensuring precise regulation performance
• Wide sink current capability supporting diverse circuit load requirements

Applications

• Feedback control driving optocouplers in switching power supplies
• Digital voltmeter reference circuits
• Op amp circuitry requiring stable voltage references
• Shunt regulator implementations

Procurement Notes

Verify the specific suffix 'D' confirms the SOIC-8 package configuration required for your PCB layout. Confirm that the 'I' designation aligns with the necessary -40°C to +85°C operating temperature range for your application environment. Ensure compatibility with RoHS compliance standards if applicable to your manufacturing process. Cross-reference the ordering information table to validate shipping formats such as rail or tape and reel availability.

Selection Notes

Select this component when a precision adjustable reference is needed to replace standard Zener diodes in high-stability applications. The ±0.4% tolerance offers tighter accuracy than standard commercial grades. Consider the SOIC-8 package dimensions for surface mount assembly constraints. Evaluate the thermal resistance characteristics if significant power dissipation is expected during continuous operation.

Part Context

This device belongs to the TL431, A, B Series family of programmable precision references manufactured by onsemi. It shares core architectural similarities with other variants like the TL431AID and TL431ID, differing primarily in initial voltage reference tolerance specifications. The series provides a versatile solution for creating non-standard reference voltages from logic supplies.

Replacement Considerations

TL431BIDG