TL431A

Overview

The EVVO TL431A is a three-terminal adjustable shunt regulator housed in an SOT-23 package. It features a reference voltage of 2.5V with a maximum initial accuracy of 0.4%. The device supports an output voltage range from 2.5V to 36V and operates within a temperature range of -40°C to +125°C. Minimum cathode current for regulation is 1.0mA, with a continuous current range up to 100mA. Dynamic impedance is specified at 0.5Ω maximum.

Feature Summary

• Adjustable output voltage capability between 2.5V and 36V using external resistors
• High precision reference voltage with 0.4% tolerance option
• Fast turn-on response suitable for active output circuitry applications

Applications

• Shunt regulator circuits
• Precision current limiters
• Replacement for Zener diodes

Procurement Notes

Verify the specific manufacturer designation as EVVO may represent a distributor or secondary source label rather than the original silicon fabricator. Confirm the datasheet revision matches the required electrical characteristics. Ensure the SOT-23 package dimensions align with the target PCB footprint. Validate that the 0.4% tolerance variant corresponds to the 'A' suffix requirement.

Selection Notes

Select this component when a low-cost, high-precision programmable reference is needed in a small surface-mount package. The 0.4% tolerance makes it suitable for applications requiring tighter voltage accuracy than standard Zener diodes. Consider the thermal resistance and power dissipation limits if operating near the upper end of the current range.

Part Context

The TL431 family serves as a widely adopted programmable shunt regulator alternative to fixed voltage references. This specific iteration utilizes the SOT-23 form factor to minimize board space while maintaining robust performance across industrial temperature ranges. It provides a stable reference point for feedback loops in power supply designs.

Replacement Considerations

Compatible replacements include the TL431A and JTL431A which share identical pinouts and electrical specifications. Verify that substitute parts maintain the same 0.4% reference voltage tolerance and SOT-23 package outline to ensure direct interchangeability without circuit modification.