LM185BYH2.5/883

Overview

The LM185BYH2.5/883 is a precision micropower voltage reference diode manufactured by Texas Instruments, belonging to the LM185/LM285/LM385 family. It provides a stable 2.5V output with an initial accuracy of ±1.5% and a maximum temperature coefficient of ±30 ppm/°C. The device supports a maximum output current of 20 mA and operates within a junction temperature range of -55°C to +125°C. Designed for through-hole mounting in TO-46-2 packages, it features low dynamic impedance and requires minimal external components. This component is qualified for military specifications under the /883 suffix, ensuring reliability in harsh environments.

Feature Summary

• Provides a stable 2.5V reference voltage with high initial accuracy
• Features low temperature coefficient for consistent performance across wide thermal ranges
• Designed for micropower applications with low dynamic impedance
• Qualified for military standards with ruggedized TO-46-2 packaging

Applications

• Precision analog-to-digital converter (ADC) reference sources
• High-stability power supply regulation circuits
• Military and aerospace instrumentation systems
• Calibration equipment requiring long-term voltage stability

Procurement Notes

Verify that the /883 suffix confirms MIL-PRF-38534 or equivalent military qualification requirements. Confirm the BYH package variant matches the required TO-46-2 hermetic seal specifications. Ensure the 2.5V output version aligns with circuit design constraints. Check for RoHS compliance status if applicable to specific program regulations. Validate supplier authorization for military-grade semiconductor procurement.

Selection Notes

Select this component when a fixed 2.5V reference is required with strict accuracy tolerances. The ±1.5% initial accuracy suits applications demanding precise baseline voltages without extensive calibration. Consider the TO-46-2 package for radiation-hardened or vibration-resistant environments. Evaluate the 20 mA current capability against load requirements. Compare temperature coefficients against alternative references if extreme thermal stability is critical.

Part Context

The LM185 series represents a legacy line of adjustable and fixed micropower voltage references originally developed by National Semiconductor and continued by Texas Instruments. The LM185BYH2.5/883 specifically denotes the 2.5V fixed version in a military-qualified TO-46-2 package. This part shares architectural similarities with the LM285 and LM385 families but offers distinct accuracy and packaging options tailored for specialized industrial and defense applications.

Replacement Considerations

Direct replacements include LM285BHY-2.5/883 or LM385BHY-2.5/883 from Texas Instruments, which share similar electrical characteristics and package types. Verify pinout compatibility and thermal coefficient specifications before substitution. Alternative non-military equivalents may require redesign due to differences in accuracy and operating temperature ranges.