TL431IPG4

Overview

The TL431IPG4 is a three-terminal adjustable shunt regulator from Texas Instruments, part of the TL431 family. It provides a programmable output voltage ranging from 2.495 V to 36 V using two external resistors. The device features an internal 2.495 V reference with initial accuracy grades including 0.5%, 1%, and 2%. It operates within a temperature range of -40°C to +85°C (TA) for this specific package variant. Key electrical characteristics include a typical output impedance of 0.2 Ω, low output noise, and a cathode current capability between 1 mA and 100 mA. It is housed in an 8-pin PDIP package.

Feature Summary

• Three-terminal adjustable shunt regulator topology
• Internal 2.495 V precision reference source
• Wide operating temperature range specification
• Low output impedance and noise performance

Applications

• Board-level regulation circuits
• Adjustable power supply designs
• Switching power supply feedback loops
• Zener diode replacement applications

Procurement Notes

Verify the specific accuracy grade suffix (e.g., A, B, C) as the base number TL431 covers multiple tolerance levels. Confirm the package type matches the design requirements, as variations exist between DIP and surface-mount options. Check RoHS compliance status for environmental regulations. Ensure the thermal rating aligns with the intended operating environment. Cross-reference the manufacturer's latest datasheet for any pinout or electrical characteristic updates.

Selection Notes

Select based on required voltage accuracy grade and operating temperature range. Consider the PDIP package for through-hole mounting needs. Evaluate the cathode current requirements against the 1 mA to 100 mA operational window. Compare against other TL431 variants if different packaging or tighter temperature coefficients are needed. Verify compatibility with existing circuit resistance values for voltage setting.

Part Context

The TL431 series is a widely used family of programmable shunt regulators known for their stability and versatility. The TL431IPG4 specifically denotes the industrial temperature grade version in an 8-pin PDIP package. It serves as a cost-effective alternative to Zener diodes in precision applications. The 'G4' suffix typically indicates lead-free and RoHS-compliant manufacturing standards.

Replacement Considerations

Compatible substitutes include other TL431 variants with matching package and temperature ratings, such as TL431AIDR or TL431ACLP, provided the accuracy grade and electrical specifications meet the design requirements. Verify pin compatibility and thermal performance before substitution.