TL431ILPG

Overview

The onsemi TL431ILPG is a three-terminal programmable shunt regulator diode housed in a TO-92 package. It operates as a low temperature coefficient zener, providing a reference voltage 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 reference input voltage tolerance of ±2.2% and an equivalent full-range temperature coefficient of 50 ppm/°C. The component functions effectively as a positive or negative voltage reference and is designed for operation within an ambient temperature range of −40 °C to +85 °C.

Feature Summary

• Programmable output voltage capability extending up to 36 V via external resistor networks
• Temperature compensated design ensuring stable performance across the full rated operating temperature range
• Low dynamic output impedance characteristic suitable for precision regulation applications

Applications

• Digital voltmeters requiring stable reference voltages
• Power supply feedback control circuits driving optocouplers
• Op amp circuitry serving as voltage references
• Shunt regulators and series pass regulators

Procurement Notes

Verify the specific suffix ILP confirms the TO-92 package and ±2.2% tolerance grade. Confirm the operating temperature range matches system requirements of −40 °C to +85 °C. Check for RoHS compliance status if environmental regulations apply. Ensure the ordering code aligns with the desired shipping configuration such as bag quantities.

Selection Notes

Select this component when a programmable precision reference is needed in a through-hole TO-92 package. The ±2.2% tolerance offers a balance between cost and accuracy compared to tighter grades. Verify that the required cathode current stays within the 1.0 mA to 100 mA operational window. Consider stability boundary conditions if load capacitance is present in the circuit design.

Part Context

This device belongs to the TL431A, B Series family of programmable precision references manufactured by onsemi. It serves as a monolithic IC replacement for traditional Zener diodes in various analog and digital applications. The TL431ILPG specifically denotes the industrial temperature grade variant packaged in TO-92 format.

Replacement Considerations

Direct substitutes include other TL431 variants with compatible pinouts and electrical characteristics. Verify that alternative parts match the TO-92 package style and the specified operating temperature range.