TL431CPWG4

Overview

The TL431CPWG4 is a three-terminal adjustable precision shunt regulator manufactured by Texas Instruments. It operates within an output voltage range of 2.495 V to 36 V, set via two external resistors. The device features a typical reference voltage tolerance of ±2% at 25°C and supports cathode currents from 1 mA to 100 mA. It utilizes an SOIC-8 surface-mount package and is designed for applications requiring stable voltage referencing in commercial environments.

Feature Summary

• Provides precise programmable shunt regulation with specified thermal stability across operating temperatures.
• Features low dynamic output impedance for effective noise filtering and stable performance.
• Offers defined turn-on characteristics suitable as a direct replacement for Zener diodes.

Applications

• Board-level voltage regulation circuits
• Adjustable linear and switching power supplies
• Portable equipment power management

Procurement Notes

Verify the specific suffix 'G4' indicates RoHS compliance and lead-free construction per Texas Instruments standards. Confirm the SOIC-8 package dimensions match the target PCB footprint. Ensure the ±2% initial accuracy meets the circuit requirements, as tighter tolerances require different grade suffixes such as 'A' or 'B'.

Selection Notes

Select this component when a standard ±2% accuracy is sufficient for the application. The SOIC-8 package is appropriate for automated surface-mount assembly processes. Consider higher accuracy grades if the design requires tighter voltage control margins than the standard commercial grade provides.

Part Context

This part belongs to the widely adopted TL431 family of programmable references. It serves as a fundamental building block for feedback loops in power conversion systems. The device replaces discrete Zener diodes to improve regulation efficiency and temperature stability in compact electronic designs.

Replacement Considerations

Direct pin-compatible substitutes include other TL431 variants with matching SOIC-8 packaging. Verify that alternative manufacturers offer equivalent electrical characteristics and thermal ratings before substitution.

FAQ

What is the minimum operating current required for proper regulation?

The device requires a minimum cathode current of 1 mA to maintain accurate regulation within its specified parameters.

How is the output voltage determined?

The output voltage is adjusted between 2.495 V and 36 V using a resistor divider network connected to the reference pin.