1N5291UR-1

Overview

The JAN1N5291UR-1 is a current regulator diode manufactured by Microchip Technology, designed for surface-mount applications. It operates within the DO-213AB-2 package and provides a regulated current of 616 µA with a maximum voltage rating of 100 V. The device dissipates up to 500 mW of power and is qualified under MIL-PRF-19500/463 standards. It functions as a constant current source over a broad voltage range, serving as an alternative to Zener diodes in specific circuit configurations.

Feature Summary

• Provides stable current regulation across a wide operating voltage range
• Hermetically sealed glass MELF package for environmental durability
• Qualified for military specifications ensuring high reliability

Applications

• Constant current sources for LED driving circuits
• Biasing elements for transistor amplifier stages
• Current limiting protection in sensitive electronic systems

Procurement Notes

Verify the specific suffix UR-1 indicates the surface-mount MELF configuration distinct from axial leaded variants. Confirm MIL-PRF-19500/463 qualification status if required for aerospace or defense projects. Check RoHS compliance documentation as military parts may differ from commercial equivalents. Ensure the DO-213AB-2 footprint matches the design layout before procurement.

Selection Notes

Select this component when a fixed current sink is needed independent of voltage fluctuations. Compare the 616 µA regulation point against circuit requirements to ensure proper biasing. Consider the 100 V maximum voltage limit to prevent breakdown during transient events. Evaluate the thermal dissipation capabilities within the enclosed space to maintain safe operating temperatures.

Part Context

This part belongs to the 1N5283-1 through 1N5314-1 series of 0.5 watt current regulators. The series offers various current values from 0.22 mA to 4.7 mA in standard tolerances. The UR-1 suffix specifically denotes the surface-mount version, contrasting with the through-hole 1N5291-1 variant which uses a DO-7 package.

Replacement Considerations

• JAN1N5291UR
• JANTX1N5291UR-1

FAQ

What is the difference between 1N5291 and JAN1N5291UR-1?

The JAN1N5291UR-1 is the military-qualified surface-mount version in a DO-213AB package, whereas the standard 1N5291 is typically a through-hole axial leaded device.

Does the device regulate voltage or current?

It regulates current, maintaining a constant output regardless of voltage changes within its specified operating range, unlike Zener diodes which regulate voltage.