LM385BM-1.2/NOPB

Overview

The LM385BM-1.2/NOPB is a micropower voltage reference diode manufactured by Texas Instruments, designed for applications requiring stable and precise voltage regulation in compact surface-mount configurations. Housed in an 8-pin SOIC package, this component operates within a commercial temperature range of 0°C to +70°C. It provides a nominal output voltage of 1.235 V with an initial accuracy of ±1%. The device features a low temperature coefficient of 20 ppm/°C, ensuring minimal drift over varying thermal conditions. It supports a maximum shunt current of 20 mA and functions as a two-terminal reference suitable for precision measurement systems.

Feature Summary

• Provides a fixed 1.235 V reference output with high initial accuracy
• Features a low temperature coefficient for stable performance across temperature variations
• Designed for micropower applications with wide operating current range
• Utilizes an 8-pin SOIC surface-mount package for space-constrained designs

Applications

• Precision analog-to-digital converter (ADC) reference sources
• Battery-powered instrumentation circuits
• Portable measurement devices requiring stable voltage references
• Data acquisition systems needing low-drift voltage standards

Procurement Notes

Verify the complete part number including the /NOPB suffix to ensure lead-free compliance and specific manufacturing lot details. Confirm the SOIC-8 package type matches your PCB footprint requirements. Check the datasheet for the latest revision history to ensure compatibility with your design specifications. Ensure the operating temperature range aligns with your system's environmental conditions. Validate that the 20 mA maximum shunt current meets your circuit's power budget constraints.

Selection Notes

Select this component when a fixed 1.235 V reference is required in a surface-mount format. The ±1% initial accuracy makes it suitable for moderate precision applications. Consider the 20 ppm/°C temperature coefficient for environments with significant thermal fluctuations. Compare against adjustable variants if flexible voltage settings are needed. Ensure the 8-pin SOIC package fits within the available board space constraints.

Part Context

This component belongs to the LM385 family of micropower voltage references from Texas Instruments. It shares functional similarities with the LM185 and LM285 series but offers improved accuracy and lower temperature coefficients. The LM385BM variant specifically denotes the B-grade accuracy level. It serves as a drop-in replacement for older National Semiconductor versions with compatible pinouts and electrical characteristics.

Replacement Considerations

LM385M-1.2/NOPB is listed as an alternate model with similar specifications. Verify package compatibility and exact accuracy grades before substitution. Cross-reference with LM385BMX-1.2 for reel packaging options. Ensure thermal performance matches the original design requirements.