TL431CDBVTE4

Overview

The TL431CDBVTE4 is a low-voltage adjustable precision shunt regulator manufactured by Texas Instruments. It operates within an output voltage range of 1.24 V to 6 V and supports a maximum cathode current of 15 mA. The device features a typical initial accuracy of ±1.5% at 25°C, with a temperature coefficient of 6 mV over the commercial temperature range. It functions as a three-terminal reference with an output impedance of approximately 0.2 Ω. The component is housed in a SOT-23-5 package and is rated for operation between 0°C and 70°C.

Feature Summary

• Adjustable output voltage capability spanning from 1.24 V to 6 V using external resistors
• Precision voltage reference performance with ±1.5% initial accuracy at 25°C
• Low output noise and typical output impedance of 0.2 Ω for stable regulation

Applications

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

Procurement Notes

Verify the specific suffix 'E4' against the manufacturer's official documentation to confirm compliance with RoHS3 standards and lead-free specifications. Confirm that the SOT-23-5 package matches the design footprint requirements. Ensure the commercial temperature rating of 0°C to 70°C aligns with the operational environment constraints before finalizing procurement.

Selection Notes

Select this component when a compact, low-cost adjustable reference is required for voltages up to 6 V. The ±1.5% tolerance suits general-purpose applications where high precision is not critical. Consider the 15 mA current limit for load requirements. For automotive or extended temperature needs, verify alternative part numbers such as the TLV431BQ series which offer wider operating ranges.

Part Context

This device belongs to the TLV431 family of low-voltage adjustable precision shunt regulators. Unlike the standard TL431 series which supports outputs up to 36 V, the TLV431 variants are optimized for lower voltage applications ranging from 1.24 V to 6 V. The TL431CDBVTE4 specifically represents the commercial grade version with standard accuracy, packaged in a small outline transistor case suitable for surface mount assembly.

FAQ

What is the minimum cathode current required for proper regulation?

The datasheet specifies a minimum cathode current of 80 µA for the device to maintain regulation.

Does the E4 suffix indicate a change in electrical function?

No, the E4 suffix typically denotes environmental compliance (RoHS) and packaging variations without altering the core electrical characteristics or pinout.