TL431CTA

Overview

The TL431CTA is a three-terminal programmable precision shunt regulator manufactured by Tae Jin Technology. It provides an adjustable output voltage ranging from the reference voltage of 2.495V up to 40V using two external resistors. The device features a guaranteed 0.5% reference voltage tolerance and operates with a cathode current range of 0.5mA to 100mA. It is characterized for operation over a full temperature range of -40°C to +125°C, offering low dynamic output impedance and fast turn-on response.

Feature Summary

• Programmable output voltage capability extending up to 40V via external resistor networks
• Guaranteed 0.5% initial reference voltage tolerance for high precision applications
• Temperature compensated design ensuring stability across the full operating temperature range
• Low dynamic output impedance and low output noise voltage characteristics

Applications

• Shunt Regulator
• Precision High-Current Series Regulator
• High-Current Shunt Regulator
• Crowbar Circuit
• PWM Converter With Reference

Procurement Notes

Verify the specific ordering suffix TA indicates tape and ammo pack packaging in TO-92 format. Confirm the 'C' designation corresponds to the 0.5% tolerance grade as documented in the manufacturer's ordering information table. Ensure compatibility with the specified operating temperature range of -40°C to +125°C for your application environment.

Selection Notes

Select this component when a precise, adjustable shunt regulator is required with tight initial accuracy. The 0.5% tolerance makes it suitable for applications demanding higher precision than standard 1% or 2% variants. Consider the TO-92 package constraints regarding thermal dissipation and board space requirements compared to surface mount alternatives like SOT-23 or SOT-89.

Part Context

This device belongs to the TL431 series of programmable precision shunt regulators. It serves as a direct replacement for Zener diodes in many circuits due to its sharp turn-on characteristic and adjustable nature. The family includes various tolerance grades and package options, with the TL431CTA specifically denoting the 0.5% tolerance version in tape-and-reel TO-92 packaging.

Replacement Considerations

Direct substitutes include other manufacturers' TL431 devices with matching 0.5% tolerance (e.g., TI TL431C). Verify pinout compatibility (Reference-Anode-Cathode) and ensure the alternative part supports the required 40V maximum cathode voltage and -40°C to +125°C operating temperature range.