TL431IP

Overview

The TL431IP is a three-terminal programmable shunt regulator diode from the TL431, A, B series manufactured by onsemi. 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 reference input voltage tolerance of ±1.0% 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 rated industrial temperature range
• Low dynamic output impedance ensuring precise regulation performance

Applications

• Feedback control driving optocouplers in power supplies
• Digital voltmeters requiring precision references
• Op amp circuitry utilizing stable voltage references
• Series pass regulators and constant current sources

Procurement Notes

Verify the specific suffix IP indicates the PDIP-8 package and the I grade defines the -40°C to +85°C operating range. Confirm RoHS compliance status if required, noting that Pb-free variants typically carry a G suffix. Ensure the ordering code matches the exact tolerance and package requirements for your design.

Selection Notes

Select this component when a programmable shunt regulator is needed for industrial temperature environments. The PDIP-8 package offers through-hole mounting convenience. Consider the ±1.0% tolerance sufficient for general applications where tighter specifications are not critical. Evaluate stability boundary conditions regarding load capacitance during circuit design.

Part Context

This device belongs to the TL431, A, B series of programmable precision references. It serves as a versatile replacement for standard Zener diodes in various analog and switching applications. The series includes variants with different tolerances and extended temperature ranges, such as the NCV prefix for automotive applications.

Replacement Considerations

Compatible substitutes include TL431AI, TL431BI, and NCV431A. Verify pinout compatibility and thermal characteristics when replacing. Ensure the alternative part meets the same operating temperature and electrical specification requirements.