LM385BM

Overview

The LM385BM is a micropower shunt voltage reference from Texas Instruments, part of the LM185/LM285/LM385 family. It provides a nominal output voltage of 2.5V with an initial accuracy of ±0.8%. The device operates within a current range of 20µA to 20mA and features a low dynamic impedance of 0.6Ω for A-grade units. It is rated for commercial temperatures from 0°C to +70°C and utilizes SOIC-8 surface-mount packaging.

Feature Summary

• Micropower operation with minimum start-up current as low as 20µA
• High precision with ±0.8% initial accuracy tolerance
• Low dynamic impedance ensuring stable voltage regulation under varying load conditions

Applications

• Precision analog-to-digital converter (ADC) reference sources
• Battery-powered instrumentation requiring low quiescent current
• Temperature measurement circuits and thermocouple cold-junction compensation
• Portable devices utilizing 9V battery power supplies

Procurement Notes

Verify the specific suffix against the official datasheet to confirm package type and temperature grade. Ensure the ordering code matches the required accuracy class, as standard and A-grade variants differ in dynamic impedance specifications. Confirm RoHS compliance status via the manufacturer's documentation before finalizing procurement.

Selection Notes

Select this component when a stable 2.5V reference is needed in space-constrained designs using surface-mount technology. It is suitable for applications where low power consumption is critical but higher precision than the standard LM385 is required. Consider thermal derating if operating near maximum current limits.

Part Context

This device belongs to the LM385 series of two-terminal bandgap voltage references manufactured by Texas Instruments. It shares functional similarities with the LM185 and LM285, differing primarily in temperature ranges and package options. The series is widely used in industrial and consumer electronics for providing reliable voltage standards.

Replacement Considerations

LM385BM/NOPB

FAQ

What is the typical dynamic impedance of the LM385BM?

For A-grade units, the dynamic impedance is typically 0.6Ω.

What is the minimum operating current for the LM385BM?

The device requires a minimum cathode current of 20µA to maintain regulation.