LM431ACZ/LFT3

Voltage Reference Overview

The LM431ACZ/LFT3 is a two-terminal adjustable shunt voltage reference manufactured by Texas Instruments, formerly National Semiconductor. It operates within an output voltage range of 2.495 V to 37 V and provides initial accuracy options of 2%, 1%, or 0.5%. The device features a temperature coefficient of 97 ppm/°C and supports a maximum series input voltage of 37 V with a maximum shunt current of 100 mA. Designed for through-hole mounting in a TO-92-3 package, it functions reliably across a temperature range from -40°C to +85°C.

Voltage Reference Feature Summary

• Two-terminal adjustable shunt regulation architecture
• High precision initial accuracy options available
• Wide operating voltage range capability

Voltage Reference Applications

• Precision voltage references
• Programmable linear regulators
• Battery-operated equipment

Voltage Reference Procurement Notes

Verify the manufacturer designation carefully, as the component was originally produced by National Semiconductor before its acquisition by Texas Instruments. Confirm that the specific suffix matches the required accuracy grade and packaging format. Ensure compatibility with existing through-hole assembly processes and thermal management requirements for the TO-92-3 enclosure.

Voltage Reference Selection Notes

Select this component when a low-cost, high-precision adjustable reference is required for through-hole designs. Consider the 97 ppm/°C temperature coefficient for thermal stability needs. Evaluate the 100 mA shunt current limit against load requirements. Compare against other LM431 variants if different accuracy grades or surface-mount packages are preferred for the specific application constraints.

Voltage Reference Part Context

This part belongs to the LM431 family of programmable shunt regulators. These devices serve as versatile alternatives to Zener diodes, offering superior performance in terms of accuracy and temperature stability. The family is widely used in power supply feedback loops and reference applications due to its simplicity and reliability.

Voltage Reference Replacement Considerations

Direct substitutes include LM431ACZ and LM431BCZ from Texas Instruments. Other compatible parts may include LM431AIMX or equivalent shunt references from manufacturers like ON Semiconductor, provided pinouts and electrical specifications align.