TL431ACP

Overview

The TL431ACP is a three-terminal programmable shunt regulator diode from onsemi, operating within an ambient temperature range of 0°C to +70°C. It provides a reference voltage tolerance of ±1.0% and supports a cathode current range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22 Ω. The device features a low temperature coefficient of 50 ppm/°C and operates as a precision zener equivalent, allowing output voltages to be programmed up to 36 V using two external resistors.

Feature Summary

• Programmable output voltage capability extending up to 36 V via external resistor networks
• Temperature compensated operation ensuring stability across the full rated operating temperature range
• Low dynamic output impedance providing precise regulation characteristics
• Wide sink current capability supporting operation from 1.0 mA to 100 mA

Applications

• Feedback control for driving optocouplers in power supply circuits
• Voltage monitoring systems requiring stable reference thresholds
• Constant current source and constant current sink implementations
• Series pass regulators and linear ohmmeter designs

Procurement Notes

Verify that the ordering suffix matches the required package type and temperature rating. Confirm RoHS compliance status if halogen-free requirements are specified. Ensure the selected variant aligns with the specific application's thermal management needs and regulatory standards. Cross-reference the datasheet revision to confirm electrical parameter consistency before finalizing procurement.

Selection Notes

Select the TL431ACP when an industrial temperature range of 0°C to +70°C is sufficient for the design. Choose this part over wider temperature variants if cost optimization is prioritized and extreme thermal conditions are not expected. Verify that the ±1.0% tolerance meets the circuit's accuracy requirements compared to tighter tolerance options.

Part Context

This component belongs to the TL431, A, B series of programmable precision references manufactured by onsemi. It serves as a direct replacement for standard Zener diodes in applications requiring higher accuracy and lower temperature drift. The family includes various packages and temperature grades to support diverse industrial and consumer electronics designs.

Replacement Considerations

Compatible substitutes include TL431ACDR2 (SOIC-8) and TL431ACP (PDIP-8). Ensure pinout compatibility and verify that the replacement maintains the same operating temperature range and electrical tolerances for the specific application.

FAQ

What is the maximum programmable output voltage for the TL431ACP?

The output voltage can be programmed up to 36 V using two external resistors.

Does the TL431ACP operate as a positive or negative voltage reference?

It can be used as either a positive or negative voltage reference since it operates as a shunt regulator.