LM185-2.5 MD8

Overview

The LM185-2.5 MD8 is a micropower two-terminal bandgap voltage reference diode manufactured by Texas Instruments. It provides a stable 2.5V reference output with an initial accuracy of ±0.8% (±20mV) and a low dynamic impedance of 0.6Ω for A-grade devices. The component operates within a wide current range of 20μA to 20mA, ensuring excellent regulation across varying load conditions. Designed for military specifications, it supports a junction temperature up to 150°C and functions reliably in temperatures from -55°C to +125°C. The device features low noise and long-term stability, making it suitable for precision analog applications requiring high reliability.

Feature Summary

• Micropower two-terminal bandgap design utilizing transistors and resistors for low noise and long-term stability
• Wide dynamic operating current range from 20μA to 20mA for versatile power supply compatibility
• High tolerance to capacitive loads, facilitating easy integration into various reference circuits
• Military-grade construction with strict voltage tolerances achieved through on-chip trimming

Applications

• Battery-powered portable instruments requiring extended battery life
• Precision analog circuits and general-purpose voltage references
• Thermocouple cold-junction compensation systems
• High-reliability military and aerospace electronic systems

Procurement Notes

Verify the specific suffix 'MD8' against official Texas Instruments documentation to confirm package type and military qualification status. Ensure compliance with RoHS and REACH standards if required by your application. Check for lead-free availability and confirm that the component meets the necessary environmental testing standards for your operational temperature range. Always refer to the latest datasheet for absolute maximum ratings and handling precautions regarding ESD sensitivity.

Selection Notes

Select this component when military-grade reliability and wide temperature operation are critical. The LM185 series offers superior performance compared to standard commercial variants like the LM385. Consider the TO-46 metal can package for hermetic sealing requirements. Evaluate the 2.5V fixed output against adjustable versions if flexibility is not needed. Ensure the circuit design accommodates the minimum 20μA operating current to maintain regulation.

Part Context

The LM185 belongs to the broader family of micropower voltage references including the LM285 and LM385. While sharing similar electrical characteristics, the LM185 is distinguished by its extended temperature range (-55°C to +125°C) and military-grade construction. This places it above the industrial LM285 and commercial LM385 in terms of environmental robustness. The family is known for replacing older Zener diodes with more stable bandgap references.

Replacement Considerations

• LM285-2.5
• LM385-2.5

FAQ

What is the typical dynamic impedance of the LM185-2.5?

For A-grade devices, the dynamic impedance is typically 0.6Ω.

Does the LM185-2.5 require external components for basic operation?

No, it is a two-terminal device that requires only a series resistor to limit current within the 20μA to 20mA operating range.

How does the LM185 handle capacitive loads?

The device is specifically designed to be highly tolerant of capacitive loads, allowing it to drive capacitive circuits without instability.