LM185H-2.5

Overview

The LM185H-2.5 is a micropower shunt voltage reference from Texas Instruments, providing a fixed nominal output of 2.5 V. It operates within a wide temperature range of -55°C to +125°C (TA). The device features an initial accuracy tolerance of ±1.5% and a maximum temperature coefficient of ±30 ppm/°C. It supports a maximum shunt current of 20 mA with a load regulation of 10 mV. Packaged in a TO-46-2 metal can for through-hole mounting, it is classified as an active component in the power management category.

Feature Summary

• Fixed 2.5 V output via bandgap reference technology
• High reliability sealed metal package suitable for harsh environments
• Wide industrial temperature rating extending to -55°C

Applications

• Precision measurement systems requiring stable references
• Industrial control circuits operating in extreme temperatures
• Battery-powered instrumentation with low quiescent current needs

Procurement Notes

Verify RoHS compliance status carefully, as historical data indicates this specific variant may be non-compliant or contain lead. Confirm the exact suffix 'H' corresponds to the TO-46-2 package and military-grade temperature range in the latest official datasheet before ordering. Ensure the supplier provides traceability documentation if used in regulated applications.

Selection Notes

Select this part when a fixed 2.5 V reference is required alongside high thermal stability and ruggedness. The TO-46 package offers superior environmental protection compared to plastic packages. Consider the ±1.5% initial tolerance against tighter requirements; if higher precision is needed, verify if other variants in the LM185 series offer better accuracy grades.

Part Context

This component belongs to the LM185/LM285/LM385 family of adjustable micropower voltage references. While the LM285 covers commercial/industrial ranges (-40°C to 85°C) and LM385 covers extended commercial (0°C to 70°C), the LM185 is specifically designed for the full military/industrial temperature range (-55°C to 125°C).

Replacement Considerations

LM185BXH-2.5 shares identical electrical specifications and package type. LM285BYMX-2.5 is a surface-mount alternative but differs in package and temperature range. Verify pinout compatibility and thermal performance when substituting.