TL1431MFKB

Overview

The TL1431MFKB is a precision programmable shunt voltage reference from the TL1431 family, manufactured by Texas Instruments. It operates within an output voltage range of approximately 2.5 V to 36 V and supports a cathode current sink capability between 1 mA and 100 mA. The device features a typical dynamic output impedance of 0.2 Ω and an initial voltage tolerance of 0.4%. It is characterized for operation over the full military temperature range of -55°C to +125°C. The component utilizes a 20-pin LCCC package with dimensions of 8.89 mm x 8.89 mm.

Feature Summary

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

Applications

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

Procurement Notes

Verify that the specific suffix 'FK' corresponds to the 20-pin LCCC package configuration as documented in the datasheet. Confirm that the 'M' designation indicates compliance with the full military temperature range (-55°C to +125°C). Ensure the ordering part number matches the exact electrical specifications required for the target application environment.

Selection Notes

Select this component when a high-reliability reference is needed for military or harsh environments requiring the -55°C to +125°C operating range. The 20-pin LCCC package offers a distinct form factor compared to standard SOIC or TO-92 options. Consider the 0.4% initial accuracy and low reference current requirements when designing the feedback network for optimal system precision.

Part Context

The TL1431 series serves as a versatile analog building block combining an accurate voltage reference and an operational amplifier. While commonly used in general power management, the TL1431M variant specifically targets ruggedized applications. The FK package variant provides a ceramic leadless chip carrier option, differing significantly from the more common plastic surface-mount packages found in the broader product line.

Replacement Considerations

TL1431MJG