LM285D-1.2R2

Overview

The LM285D-1.2R2G is a micropower two-terminal bandgap voltage reference diode manufactured by onsemi. It provides a fixed output voltage of 1.25 V with an initial tolerance of 1%. The device operates within a current range of 10 µA to 20 mA and features a dynamic impedance of 1 Ω. It is housed in a surface-mount SOIC-8 package and is rated for operation over an extended temperature range from -40°C to +85°C.

Feature Summary

• Micropower two-terminal bandgap voltage regulator design
• Exceptionally low dynamic impedance for stable regulation
• Tight voltage tolerances achieved via on-chip trimming
• Stable operation across wide temperature and time variations

Applications

• Portable instrumentation requiring extended battery life
• Analog circuitry serving as precision reference sources
• Voltage regulators utilizing shunt reference topology

Procurement Notes

Verify the complete part number, including suffixes such as 'G' or 'R2', against official onsemi documentation to ensure correct packaging and tolerance grades. Confirm that the SOIC-8 package type matches the target PCB footprint and that the -40°C to +85°C industrial temperature rating aligns with the operational environment requirements.

Selection Notes

Select this component when a low-cost, micropower shunt reference is required for analog signal conditioning. The 1.25 V output is suitable for low-voltage ADC references. Ensure the series resistor limits current to the 20 mA maximum while maintaining at least 10 µA for proper regulation. Consider the SOIC-8 package for automated assembly processes.

Part Context

This device belongs to the LM285/LM385 series of micropower voltage references. While the LM385 is rated for commercial temperatures (0°C to +70°C), the LM285 variant extends the operating range to -40°C to +85°C. The series utilizes bandgap technology to provide temperature-stable voltage references in both through-hole and surface-mount packages.