LM185BH

Overview

The LM185BH is an adjustable micropower voltage reference manufactured by Texas Instruments, formerly National Semiconductor. It utilizes a shunt regulation architecture housed in a TO-3 metal can package designed for through-hole mounting. The device provides an output voltage range from 1.24 V to 5.3 V with an initial accuracy of 1 percent. It operates within a temperature coefficient of 150 ppm per degree Celsius and supports a maximum shunt current of 20 mA. The component functions reliably across an extended industrial temperature range spanning from -55 °C to +125 °C.

Feature Summary

• Provides stable micropower voltage regulation suitable for precision analog circuits
• Features adjustable output capability allowing flexible design integration
• Constructed in a robust TO-3 metal case for high thermal stability

Applications

• Precision measurement instrumentation requiring stable reference voltages
• Industrial control systems operating in extreme temperature environments
• Data acquisition systems utilizing analog-to-digital conversion

Procurement Notes

Verify the manufacturer designation as Texas Instruments when sourcing this legacy part number. Confirm the specific suffix NOPB indicates lead-free compliance if required by your assembly process. Ensure the TO-3 package dimensions match your existing board layout constraints before finalizing procurement orders.

Selection Notes

Select this component when a wide adjustable voltage range is necessary compared to fixed references. The TO-3 package offers superior heat dissipation capabilities for higher current applications up to 20 mA. Consider the 150 ppm/°C temperature coefficient against stricter requirements that might necessitate bandgap alternatives.

Part Context

This device belongs to the LM185-adj series of adjustable voltage references. It serves as a bridge between older National Semiconductor designs and current Texas Instruments production lines. The TO-3 packaging distinguishes it from modern surface-mount equivalents while maintaining compatibility with traditional through-hole manufacturing techniques.

Replacement Considerations

Check for direct pin-compatible substitutes within the LM185 family. Verify electrical parameters such as output voltage range and temperature coefficients against alternative shunt references. Ensure any replacement maintains the same TO-3 mechanical footprint for seamless integration.