1N5304UR-1

Overview

The 1N5304UR-1 is a current regulator diode manufactured by Microchip Technology, designed for surface-mount applications. It utilizes the DO-213AB (MELF) glass package to provide stable current regulation in compact circuits. The device supports a maximum voltage of 100V and operates within an extended junction temperature range from -65°C to +175°C. Key electrical parameters include a maximum regulator current of 1.98mA and a peak operating voltage of 100V. The component features a minimum dynamic impedance of 420 uohms and a maximum regulator voltage of 1.75V, ensuring consistent performance under varying load conditions.

Feature Summary

• Provides stable current regulation using a round-end surface-mount design suitable for automated assembly.
• Operates reliably across an extended industrial and military-grade temperature range up to 175°C.
• Utilizes a hermetically sealed glass MELF package for environmental protection and durability.

Applications

• Constant current sources for LED driving circuits
• Biasing networks for transistor amplifiers
• Current limiting protection in sensitive electronic loads

Procurement Notes

Verify the specific suffix UR-1 against the official Microchip datasheet to confirm the exact package type and manufacturing lot details. Ensure that the procurement channel provides valid traceability documentation, as this component may be subject to export controls or restricted distribution channels depending on the final application and destination region.

Selection Notes

Select the 1N5304UR-1 when a fixed current of approximately 1.98mA is required in a space-constrained surface-mount layout. Compare the 1.75V maximum regulator voltage against the available headroom in the circuit design. Ensure the power dissipation capabilities align with the thermal management strategy, considering the 500mW typical rating associated with this family.

Part Context

This component belongs to the 1N53xx series of current regulator diodes produced by Microchip Technology. These devices are engineered to replace traditional Zener-based constant current solutions, offering superior stability and lower noise. The UR-1 designation typically indicates a specific surface-mount variant within the broader MIL-PRF-19500/463 qualified product line.

Replacement Considerations

Direct substitutes include other 1.98mA current regulator diodes in the DO-213AB package, such as the JANTX1N5304-1/TR. Verify pinout compatibility and thermal characteristics before substitution. Cross-referencing with the manufacturer's official replacement guide is recommended to ensure functional equivalence.