TL1431CDRE4

Overview

The TL1431CDRE4 is a precision programmable shunt voltage reference manufactured by Texas Instruments. It operates in an 8-pin SOIC package and provides an adjustable output voltage ranging from approximately 2.5 V to 36 V using two external resistors. The device features a typical dynamic output impedance of 0.2 Ω and supports a cathode sink current range from 1 mA to 100 mA. It includes fast turn-on characteristics with a time of 500 ns and low reference input current requirements.

Feature Summary

• Precision programmable reference with specified thermal stability across commercial, automotive, and military temperature ranges.
• Active output circuitry provides sharp turn-on characteristics suitable for Zener diode replacement applications.
• Internally compensated for stability without requiring an output capacitor between the cathode and anode pins.

Applications

• Adjustable voltage and current referencing
• Secondary side regulation in flyback switching power supplies (SMPS)
• Voltage monitoring circuits
• Comparators with integrated reference

Procurement Notes

Verify that the ordering suffix E4 indicates compliance with RoHS standards as documented by Texas Instruments. Confirm the specific temperature grade required for the application, as the base TL1431 family includes C (commercial), Q (automotive), and M (military) variants with distinct operating ranges. Ensure the selected package matches the design layout requirements.

Selection Notes

Select this component when high accuracy and wide voltage adjustability are required in a compact surface-mount form factor. Consider the 0.4% initial voltage tolerance and low temperature deviation for precision applications. Evaluate the 100 mA sink capability against load requirements and verify thermal dissipation within the SOIC-8 package constraints.

Part Context

The TL1431CDRE4 belongs to the TL1431 family of precision programmable references. This series serves as a versatile analog building block combining an accurate voltage reference and operational amplifier. It is widely utilized in industrial, automotive, telecommunications, and computing equipment for onboard regulation and power management tasks.

Replacement Considerations

TL1431CDR

FAQ

Is the TL1431 internally compensated?

Yes, the TL1431 is internally compensated to be stable without an output capacitor between the cathode and anode, though external capacitance can be used for transient response improvement if needed.

What is the minimum cathode current required for regulation?

The device requires a minimum cathode current (Imin) of 1 mA to operate in the proper linear region and maintain regulation.