TL431AIPG4

Overview

The TL431AIPG4 is a three-terminal adjustable shunt regulator from the Texas Instruments TL431 series. It operates with an input voltage range of 2.5V to 36V and provides an initial accuracy of ±1%. The device supports a maximum cathode current of 100mA and features a temperature coefficient of 92 ppm/°C. Designed for through-hole mounting, it utilizes an 8-pin PDIP package (0.300 inch width). The component functions within a temperature range of -40°C to 85°C and serves as a precision reference in switching power supplies.

Feature Summary

• Adjustable output voltage capability ranging from the internal reference level up to 36V using external resistors
• High precision performance with ±1% initial accuracy tolerance at 25°C
• Stable operation as a shunt regulator with sink-current capability from 1mA to 100mA
• Pin-compatible design facilitating direct replacement for standard Zener diodes in regulation circuits

Applications

• Onboard voltage regulation modules
• Adjustable linear and switching power supplies
• Isolated optocoupler flyback power supply error amplifiers
• Undervoltage monitoring and comparator applications

Procurement Notes

Verify the specific suffix 'PG4' indicates lead-free construction and RoHS compliance per Texas Instruments documentation. Confirm the package type matches the required 8-pin DIP footprint for your PCB layout. Ensure the operating temperature range of -40°C to 85°C meets your environmental specifications. Cross-reference the datasheet for any recent product change notices affecting this specific revision.

Selection Notes

Select the TL431AIPG4 when high accuracy is required compared to standard ±2% variants. The PDIP package is suitable for prototyping or applications requiring through-hole assembly. Consider the 100mA current limit for load requirements. Verify that the 36V maximum input voltage aligns with your circuit's supply rails. This component is ideal for replacing Zener diodes where sharper turn-on characteristics are needed.

Part Context

This component belongs to the industry-standard TL431 family of programmable references. It shares functional similarities with the TLA431 but lacks the latter's all-capacitor stability feature. The TL431 series is widely used in power management for its reliability and cost-effectiveness. The 'A' grade denotes the tighter ±1% tolerance band available in this specific part number.

Replacement Considerations

The TL431IDBZR is listed as a manufacturer-recommended alternative for surface-mount applications. For pin-compatible replacements, verify if the TLA431 series meets stability requirements for capacitive loads. Standard TL431 variants with different accuracy grades may serve as substitutes if tolerance requirements allow.