LM185BYH-1.2

Overview

The LM185BYH-1.2 is a micropower voltage reference diode manufactured by Texas Instruments, belonging to the LM185 series. It provides a fixed output voltage of 1.24 V with an initial accuracy of 1%. The device operates within a temperature range of -55°C to +125°C and features a temperature coefficient of 150 ppm/°C. Designed for through-hole installation in TO-3 packages, it supports a maximum shunt current of 20 mA. This component serves as a precision reference source for analog circuits requiring stable voltage levels under varying thermal conditions.

Feature Summary

• Provides a stable 1.24 V reference output with 1% initial accuracy
• Operates reliably across extended industrial temperatures from -55°C to +125°C
• Utilizes TO-3 through-hole packaging for robust mechanical mounting

Applications

• Precision analog signal conditioning circuits
• Data acquisition systems requiring stable reference voltages
• Industrial control equipment operating in extreme environments

Procurement Notes

Verify the specific suffix 'BYH' against the official Texas Instruments datasheet to confirm package type and electrical tolerances. Ensure the procurement channel sources genuine components to avoid counterfeit devices. Confirm RoHS compliance status if required by your manufacturing standards, as older variants may differ. Cross-reference the manufacturer part number with authorized distributors to ensure authenticity and traceability before finalizing orders.

Selection Notes

Select this component when a fixed 1.24 V reference is required in high-reliability applications. The TO-3 package offers superior thermal dissipation compared to smaller surface-mount options. Consider the 150 ppm/°C temperature coefficient for circuit stability over wide temperature ranges. Verify that the 20 mA maximum shunt current meets the power budget of your design. Ensure the through-hole form factor aligns with your PCB layout constraints.

Part Context

The LM185 series represents a family of micropower voltage references designed for precision applications. The LM185BYH-1.2 variant specifically delivers a fixed 1.24 V output, distinguishing it from adjustable versions like the LM185BH. Manufactured by Texas Instruments following their acquisition of National Semiconductor, these devices are known for long-term stability and low noise characteristics suitable for sensitive measurement systems.

Replacement Considerations

Publicly confirmed substitute part numbers include LM185BYH-1.2/NOPB. Verify pinout compatibility and thermal performance when substituting. Ensure the replacement maintains the same 1.24 V output and TO-3 package dimensions.