TL431IDE4

Overview

The TL431IDE4 is a three-terminal adjustable shunt regulator from Texas Instruments, serving as a precision voltage reference. It operates within an output voltage range of approximately 2.5 V to 36 V, set via two external resistors. The device features a typical output impedance of 0.2 Ω and supports cathode currents between 1 mA and 100 mA. It is available in SOIC-8 packaging with specified thermal stability across automotive, commercial, and military temperature ranges.

Feature Summary

• Provides precise programmable shunt regulation for stable voltage references
• Features low output noise and high dynamic performance
• Offers explicit turn-on characteristics suitable for Zener diode replacement

Applications

• Board-level voltage regulation
• Adjustable power supplies
• Switching power supply feedback loops

Procurement Notes

Verify the specific suffix 'E4' indicates lead-free compliance and RoHS status per manufacturer documentation. Confirm package dimensions against SOIC-8 mechanical drawings. Ensure sourcing channels provide valid datasheets matching the TI part number to avoid counterfeit components.

Selection Notes

Select this component when a reliable, low-cost adjustable reference is required for feedback control. Consider the 0.2 Ω output impedance for load regulation needs. Verify that the operating current range of 1 mA to 100 mA aligns with the circuit's minimum and maximum load requirements.

Part Context

This part belongs to the widely adopted TL431 family of programmable shunt regulators. It functions as a versatile alternative to traditional Zener diodes, offering superior accuracy and temperature stability. The device is integral to linear and switching power supply designs requiring precise voltage monitoring or regulation.

Replacement Considerations

Direct substitutes include other manufacturers' TL431 equivalents such as those from STMicroelectronics or ON Semiconductor. Verify pinout compatibility and electrical specifications before substitution.