TL431BIDR2

Overview

The onsemi TL431BIDR2 is a three-terminal programmable shunt regulator diode in an SOIC-8 package. It operates as a low temperature coefficient zener, programmable from Vref to 36 V using two external resistors. The device features a voltage reference tolerance of ±0.4% at 25°C and a typical dynamic output impedance of 0.22 Ω. It supports a sink current range of 1.0 mA to 100 mA with a full-range temperature coefficient of 50 ppm/°C. Maximum ratings include a cathode-to-anode voltage of 37 V and continuous cathode current up to 150 mA.

Feature Summary

• Programmable precision reference utilizing internal 2.5 V reference for stable operation
• Temperature compensated design ensuring consistent performance across the rated operating range
• Low dynamic output impedance providing effective regulation under varying load conditions

Applications

• Feedback control circuits driving optocouplers in power supplies
• Digital voltmeters requiring precise voltage references
• Op amp circuitry serving as stable reference sources
• Voltage monitor applications with defined threshold limits

Procurement Notes

Verify that the ordering suffix matches the required package type and shipping configuration. Confirm the specific tolerance grade aligns with circuit requirements. Ensure compliance with RoHS standards if lead-free packaging is mandated. Check automotive qualification status if NCV prefix variants are needed for unique site control. Validate thermal dissipation capabilities against ambient temperature constraints during integration.

Selection Notes

Select this component when a high-precision, adjustable shunt regulator is required for feedback loops or reference generation. The ±0.4% tolerance suits applications demanding tight voltage accuracy. Consider the wide operating current range for flexibility in biasing designs. Evaluate stability boundary conditions regarding load capacitance to prevent oscillation. Choose this device over fixed zeners for superior temperature compensation and lower dynamic impedance characteristics.

Part Context

This part belongs to the TL431, A, B series of programmable precision references manufactured by onsemi. It serves as a monolithic IC replacement for traditional zener diodes in various analog and power management applications. The device integrates multiple transistors to achieve its regulation functions within a compact surface-mount footprint.

Replacement Considerations

TL431BIDG is a tube-packaged equivalent offering identical electrical specifications and pinout compatibility.