TL1431CDE4

Overview

The TL1431CDE4 is a precision programmable shunt voltage reference manufactured by Texas Instruments, housed in an 8-pin SOIC package. It features a typical output impedance of 0.2 Ω and a fast turn-on time of 500 ns. The device supports a sink current capability ranging from 1 mA to 100 mA with a low reference input current. The adjustable output voltage spans from approximately 2.5 V to 36 V, set via two external resistors. It exhibits a 0.4% initial voltage tolerance at 25°C and operates within the commercial temperature range of 0°C to 70°C.

Feature Summary

• Precision programmable reference with specified thermal stability over commercial temperature ranges
• Active output circuitry provides sharp turn-on characteristics for effective Zener diode replacement
• Internally compensated for stability without requiring an output capacitor between cathode and anode

Applications

• Adjustable voltage and current referencing
• Secondary side regulation in flyback switching mode power supplies (SMPS)
• Voltage monitoring systems
• Comparator applications with integrated reference

Procurement Notes

Verify that the ordering suffix 'E4' corresponds to lead-free packaging specifications as defined by Texas Instruments. Confirm the specific package variant matches the required PCB footprint. Ensure the component grade aligns with the intended commercial operating temperature range requirements.

Selection Notes

Select this component when a high-precision shunt regulator is needed for industrial or commercial environments. The 0.4% initial accuracy suits applications demanding tight voltage tolerances. Consider the 8-pin SOIC package for surface-mount assembly constraints and verify compatibility with the system's thermal management strategy.

Part Context

The TL1431 series serves as a versatile analog building block combining an accurate voltage reference with an operational amplifier. It functions as a single voltage reference, error amplifier, or comparator. The device is widely utilized across industrial, automotive, telecommunications, and computing sectors due to its broad adjustability and robust performance characteristics.

Replacement Considerations

Direct substitutes include TL1431CDR and TL1431CDRE4. Verify pinout compatibility and electrical parameter alignment before substitution.