TL431BILPRAG

Overview

The onsemi TL431BILPRAG is a three-terminal programmable shunt regulator diode in the TL431B series. 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 supports a cathode current range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22 Ω. It includes an equivalent full-range temperature coefficient of 50 ppm/°C and is designed for operation over an ambient temperature range of −40 °C to +85 °C.

Feature Summary

• Programmable output voltage capability up to 36 V via external resistors
• High precision voltage reference with ±0.4% tolerance at 25 °C
• Low dynamic output impedance for stable regulation performance
• Temperature compensated operation across the full rated industrial range

Applications

• Digital voltmeters requiring stable reference sources
• Power supply feedback control loops
• Op amp circuitry needing precise biasing
• Voltage monitor circuits with defined thresholds

Procurement Notes

Verify the specific suffix 'LPRA' corresponds to the TO-92 tape and reel packaging configuration before procurement. Confirm that the B-series designation aligns with the required ±0.4% initial accuracy specifications for the target application. Ensure the operating environment falls within the specified −40 °C to +85 °C range to maintain guaranteed electrical characteristics.

Selection Notes

Select this component when high precision is required alongside wide programmability. The B-series offers tighter tolerance than standard variants. Consider the TO-92 package for through-hole mounting requirements. Verify stability boundary conditions if significant load capacitance is present in the design to ensure loop stability without additional compensation components.

Part Context

This part belongs to the TL431A, B series of programmable precision references manufactured by onsemi. These monolithic ICs serve as direct replacements for traditional Zener diodes in many applications. The series provides flexibility in setting reference voltages while maintaining low noise and high stability characteristics suitable for sensitive analog and digital systems.

Replacement Considerations

Direct substitutes include other TL431B series devices from onsemi or cross-manufacturer equivalents like the TL431BIP from Texas Instruments, provided pinouts and electrical tolerances match.