LM285M-1.2/NOPB

Overview

The LM285M-1.2/NOPB is a micropower shunt voltage reference IC manufactured by Texas Instruments, housed in an 8-SOIC surface-mount package. It provides a fixed output voltage of 1.235 V with an initial accuracy of 1%. The device operates within a temperature range of -40°C to +85°C and features a temperature coefficient of 150 ppm/°C. Maximum shunt current is rated at 20 mA, supporting stable regulation for precision applications requiring low power consumption.

Feature Summary

• Fixed 1.235 V output voltage for precise reference requirements
• Micropower operation suitable for battery-powered systems
• Shunt regulation topology for simple circuit implementation

Applications

• Portable instrumentation reference sources
• Battery-operated measurement devices
• Precision data acquisition systems

Procurement Notes

Verify the complete part number including the NOPB suffix to ensure lead-free compliance and specific packaging configuration. Confirm the SOIC-8 package variant matches your PCB footprint requirements. Check the datasheet for minimum operating current specifications to ensure proper biasing conditions are met during design integration.

Selection Notes

Select this component when a fixed 1.235 V reference is required in a compact surface-mount format. The 1% initial accuracy suits general precision applications, while the 150 ppm/°C temperature coefficient defines thermal stability limits. Ensure the 20 mA maximum current rating accommodates the load and series resistor calculations for the target application environment.

Part Context

This device belongs to the LM285 family of micropower voltage references, which includes adjustable variants like the LM285M/NOPB. Unlike the adjustable version that allows output setting via external resistors, this specific model offers a fixed internal reference voltage. It shares the same SOIC-8 package and operational characteristics as other members of the series but provides a dedicated 1.235 V output without external programming components.

Replacement Considerations

The LM285DR-1.2 serves as a direct pin-compatible alternative within the same series, offering identical 1.235 V output and 8-SOIC packaging. Verify temperature coefficient specifications if higher thermal stability is required, as some variants may differ slightly in performance metrics despite functional equivalence.