1N5304UR-1/TR

Overview

The Microchip Technology 1N5304UR-1/TR is a surface-mount current regulator diode housed in a DO-213AB (MELF) package. It provides a nominal regulating current of 1.80 mA with a tolerance range of 1.62 mA to 1.98 mA at a voltage of 25 V. The device features a minimum regulator impedance of 0.420 MΩ and a maximum limiting voltage of 1.75 V. It operates within a junction temperature range of -65 °C to +150 °C, supports a working peak voltage of 100 V, and dissipates up to 500 mW.

Feature Summary

• JEDEC registered surface mount equivalent of the 1N5283 through 1N5314 series
• Hermetically sealed leadless glass case with internal metallurgical bond
• Double-plug construction for enhanced reliability
• Inherently radiation hard design

Applications

• Current regulation over broad operating voltage ranges
• Temperature-compensated reference circuits
• Biasing networks for semiconductor devices

Procurement Notes

Verify that the ordering suffix /TR indicates tape and reel packaging per EIA-481-1-A standards. Confirm RoHS compliance status as commercial grade versions are available while military qualifications require specific suffixes. Ensure the mounting surface Coefficient of Expansion matches the device's axial coefficient to prevent mechanical stress during thermal cycling.

Selection Notes

Select this component when a surface-mount solution is required for constant current applications. The DO-213AB package serves as the direct surface-mount replacement for the axial-leaded 1N5304-1. Verify that the 1.80 mA nominal current aligns with circuit requirements and that the 100 V peak operating voltage exceeds the maximum expected reverse bias across the device.

Part Context

This part belongs to the 1N5283UR-1 through 1N5314UR-1 series of 0.5 watt current regulators manufactured by Microchip Technology. These devices function as counterparts to Zener diodes by regulating current rather than voltage. The series offers a wide selection of currents from 0.22 mA to 10.0 mA in standard 10% tolerances.

Replacement Considerations

The axial-leaded 1N5304-1 is the direct functional equivalent. For military specifications, consider JANTX1N5304-1 or JANS1N5304-1 if qualification levels are required.