LM185BYH-1.2/NOPB

Overview

The LM185BYH-1.2/NOPB is a micropower voltage reference diode manufactured by Texas Instruments, belonging to the LM185-adj series. It operates in a TO-3 through-hole package and functions as a shunt adjustable reference. The device provides an output voltage range of 1.24 V to 5.3 V with an initial accuracy of 1%. It features a temperature coefficient of 150 ppm/°C and supports a maximum shunt current of 20 mA. The component is rated for operation between -55°C and +125°C.

Feature Summary

• Provides stable micropower voltage reference functionality using shunt regulation topology.
• Offers adjustable output voltage capability within a specified wide range.
• Designed for high reliability with extended industrial temperature operating limits.

Applications

• Precision analog circuit voltage referencing
• Data acquisition system reference sources
• Radiation-hardened electronic testing environments

Procurement Notes

Verify the specific suffix 'BYH' against the manufacturer's latest documentation to confirm pinout and mechanical dimensions match the intended TO-3 footprint. Ensure the NOPB designation confirms lead-free compliance if required by assembly specifications. Cross-reference the datasheet revision date to validate electrical parameters against current production standards before finalizing procurement.

Selection Notes

Select this component when a ruggedized, through-hole voltage reference is required for harsh environments. The TO-3 package offers superior thermal dissipation compared to smaller surface-mount alternatives. Consider the 150 ppm/°C temperature coefficient and 1% initial accuracy to ensure they meet the precision requirements of the target application circuit design.

Part Context

This part belongs to the LM185 family of micropower voltage references originally developed by National Semiconductor and continued by Texas Instruments after acquisition. The LM185 series is known for its robustness and stability, often utilized in applications requiring reliable performance under varying thermal conditions or radiation exposure scenarios.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Verify compatibility with LM285 or LM385 series variants only if their specific electrical characteristics and package configurations align precisely with the design requirements.

FAQ

How does the LM185 behave under total ionizing dose radiation?

The LM185 degrades through total ionizing dose radiation but begins to recover at approximately 70 krad, with recovery curves differing based on dose rates and bias conditions.

What is the maximum shunt current rating?

The maximum shunt current rating for the LM185BYH-1.2/NOPB is 20 mA.