TL431CPG

Overview

The TL431CPG is a three-terminal programmable shunt regulator diode manufactured by onsemi. It operates as a low temperature coefficient zener, programmable from Vref to 36 V using two external resistors. The device features a wide operating current range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22 Ω. It provides a stable 2.5 V reference for logic supplies and functions as either a positive or negative voltage reference. The component is housed in a TO-92 package and supports an operating ambient temperature range of 0 °C to +70 °C.

Feature Summary

• Programmable output voltage capability up to 36 V
• Temperature compensated operation over the full rated range
• Low dynamic output impedance for stable regulation
• RoHS compliant and lead-free construction

Applications

• Digital voltmeters
• Power supply feedback control
• Op amp circuitry
• Voltage monitoring systems

Procurement Notes

Verify the specific suffix 'CPG' against the manufacturer's ordering information table to confirm the exact package style (TO-92) and shipping configuration. Ensure the required tolerance class matches the application needs, as the base part number covers multiple accuracy grades. Confirm that the commercial temperature range meets the environmental requirements of the target design.

Selection Notes

Select this component when a precise, adjustable voltage reference is needed within a standard TO-92 footprint. Consider the 0 °C to +70 °C operating range to ensure suitability for the intended environment. Evaluate the sink current capability against the load requirements to maintain regulation within the specified 1.0 mA to 100 mA window.

Part Context

This device belongs to the TL431A, B series of programmable precision references. It serves as a direct replacement for standard Zener diodes in applications requiring higher accuracy and lower temperature drift. The family includes variants with different tolerances and extended temperature ranges, such as the NCV prefix for automotive qualification.

Replacement Considerations

Check the datasheet discontinuation list for legacy packages. Verify if the TL431BCLPRMG or similar updated TO-92 variants are available as direct replacements if the CPG suffix is no longer supported.