LM185H-2.5/883

Overview

The LM185H-2.5/883 is a micropower shunt voltage reference manufactured by Texas Instruments, designed for high-reliability applications requiring precise voltage regulation. This component provides a stable nominal output voltage of 2.5 V with an initial accuracy tolerance of ±1.5%. It operates within a wide temperature range from -55°C to +125°C (TA), ensuring consistent performance in extreme environments. The device features a load regulation of 10 mV and a temperature coefficient of ±150 ppm/°C, which supports stability under varying thermal conditions. With a maximum output current capability of 20 mA, it serves as a robust reference source for analog circuits.

Feature Summary

• Provides a stable 2.5 V reference voltage with ±1.5% initial accuracy
• Operates reliably across an extended industrial temperature range of -55°C to +125°C
• Features low temperature drift characteristics suitable for precision applications

Applications

• High-reliability military and aerospace electronic systems
• Precision measurement instrumentation requiring stable voltage references
• Industrial control systems operating in extreme environmental conditions

Procurement Notes

Verify that the specific suffix /883 denotes compliance with MIL-PRF-38534 or equivalent military reliability standards, as this significantly impacts qualification requirements. Confirm RoHS status, as historical data indicates potential lead content in standard variants; ensure the procurement specification explicitly matches the required environmental compliance level for your assembly process. Cross-reference the manufacturer's latest datasheet revision to confirm pinout and electrical parameter consistency before finalizing design-in decisions.

Selection Notes

Select this component when designing for harsh environments where standard commercial-grade references may fail due to temperature extremes. The ±1.5% tolerance offers tighter accuracy than basic zener diodes but may require calibration if ultra-high precision is needed. Consider the 20 mA current limit when sizing series resistors to ensure adequate biasing without exceeding power dissipation limits. Evaluate the TO-46 package constraints regarding board space and thermal management compared to surface-mount alternatives.

Part Context

This part belongs to the LM185/LM285/LM385 family of adjustable micropower voltage references originally developed by National Semiconductor and now maintained by Texas Instruments. The LM185 variant specifically targets applications needing a fixed 2.5 V reference. The /883 suffix typically indicates a military-grade version adhering to strict quality and reliability standards, distinguishing it from commercial counterparts like the LM185BXH-2.5 which may have different packaging or qualification levels.

Replacement Considerations

LM185BXH-2.5: Verify if military qualification is strictly required; otherwise, this commercial equivalent may suffice for less demanding environments.