TL431AILPRM

Overview

The TL431AILPRM is a three-terminal programmable shunt regulator diode from onsemi, operating within the TL431 series. It functions as a low temperature coefficient Zener reference, adjustable 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 ±1% and an equivalent full-range temperature coefficient of 50 ppm/°C. Designed for industrial applications, it operates over an 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 operation across the full rated industrial temperature range
• Low dynamic output impedance ensuring stable regulation under varying load conditions
• Pb-free package construction compliant with RoHS standards

Applications

• Digital voltmeters requiring precise reference voltages
• Power supply feedback control loops driving optocouplers
• Op amp circuitry serving as stable voltage references
• Constant current sources and sinks in linear circuits

Procurement Notes

Verify the specific suffix 'RM' corresponds to the TO-92 (TO-226) package configuration with tape and ammo box shipping information. Confirm that the ordering code matches the required 1.0% tolerance specification for the A-grade device. Ensure compatibility with the specified -40°C to +85°C operating temperature range for your application environment before finalizing procurement.

Selection Notes

Select this component when a precision, adjustable shunt regulator is needed for industrial environments. The 1.0% tolerance offers higher accuracy than standard B-grade devices. Consider the TO-92 package for through-hole mounting requirements. Evaluate stability boundary conditions regarding load capacitance and cathode current to ensure loop stability in your specific circuit topology.

Part Context

This part belongs to the TL431, A, B Series and NCV431A, B family of programmable precision references manufactured by onsemi. These monolithic ICs replace traditional Zener diodes in various analog and power management applications. The series includes variants with different tolerances and temperature ranges, such as the C-grade for commercial use and BV-grade for extended automotive temperatures.

Replacement Considerations

Direct substitutes include other TL431AILPRM units or compatible parts like the LM431BIZX from onsemi. Verify pinout compatibility and electrical specifications against the original datasheet requirements. Ensure any replacement maintains the required 1.0% tolerance and industrial temperature rating.