LM385BXMX-1.2/NOPB

Overview

The LM385BXMX-1.2/NOPB is a fixed shunt voltage reference IC manufactured by Texas Instruments, originally part of the National Semiconductor portfolio. It provides a precise output voltage of 1.235V with an initial tolerance of ±1%. The device operates within a current range of 10μA to 20mA and features a dynamic impedance of 1Ω. Designed for surface-mount applications, it utilizes an 8-SOIC package and functions over a temperature range of 0°C to +70°C.

Feature Summary

• Provides a stable fixed reference voltage of 1.235V with high initial accuracy.
• Features exceptionally low dynamic impedance for improved regulation stability.
• Operates efficiently with a wide operating current range from microamps to milliamps.

Applications

• Precision analog-to-digital converter (ADC) reference sources
• Data acquisition systems requiring stable voltage references
• Battery-powered instruments due to low power consumption

Procurement Notes

Verify that the component is sourced as a Texas Instruments product, as National Semiconductor was acquired. Confirm the suffix NOPB indicates lead-free and RoHS compliance. Ensure the specific -1.2 variant matches the required 1.235V output specification rather than adjustable versions. Check packaging details to confirm tape-and-reel format for the MX suffix.

Selection Notes

Select this component when a fixed 1.235V reference is required in an 8-SOIC surface-mount package. It is suitable for designs needing ±1% initial accuracy and operation up to 20mA load current. Consider the 0°C to +70°C temperature range limits for environmental compatibility. Compare against adjustable variants if circuit flexibility for voltage setting is needed.

Part Context

This component belongs to the LM385 family of shunt voltage references, which includes both adjustable and fixed output versions. The LM385 series is widely used in industrial and consumer electronics for providing stable reference voltages. The BXMX-1.2 designation specifically identifies the fixed 1.235V output version in the SOIC-8 package, distinguishing it from adjustable counterparts like the LM385M.

Replacement Considerations

The LM385BDR-1.2/NOPB is a documented substitute offering similar electrical characteristics in a different package configuration. Verify pinout compatibility and thermal performance when swapping between SOIC-8 variants. Ensure the replacement maintains the required ±1% tolerance and 1Ω dynamic impedance specifications.