LM385Z-2.5/LFT2

Overview

The LM385Z-2.5/LFT2 is a micropower two-terminal band-gap voltage reference diode manufactured by National Semiconductor. It provides a fixed output voltage of 2.5 V with a tolerance of ±3%. The device operates within a current range of 20 µA to 20 mA and is housed in a TO-92-3 package. It features a maximum operating temperature of 70 °C, with an output voltage range spanning from 2.425 V to 2.575 V.

Feature Summary

• Micropower two-terminal band-gap voltage regulation
• Fixed 2.5 V output reference
• Wide operating current range

Applications

• Low-cost isolation amplifier circuits
• Instrumentation applications requiring galvanic isolation
• Microcontroller reference sources

Procurement Notes

Verify the specific suffix LFT2 against official National Semiconductor documentation to confirm pinout and packaging details. Ensure compliance requirements are checked as some listings indicate leaded construction. Confirm the manufacturer source is National Semiconductor or its successor entity for accurate technical specifications.

Selection Notes

Select this component when a stable 2.5 V reference is required in space-constrained designs using TO-92 packages. Consider the ±3% tolerance and 70 °C operating limit for environmental constraints. Evaluate the 20 µA to 20 mA current range against circuit load requirements to ensure proper shunt operation.

Part Context

This part belongs to the LM185/LM285/LM385 family of micropower voltage references. The 'Z' suffix typically denotes a plastic package variant, while 'LFT2' specifies the tape and reel packaging format. These devices share core band-gap technology across the series, differing primarily in temperature grades and packaging options.

Replacement Considerations

LM385BZ-2.5/NOPB offers tighter ±1.5% tolerance. LM385Z-2.5/NOPB is a lead-free version of the same electrical specification. Verify pin compatibility and thermal characteristics when substituting.