1N5285UR-1/TR

Overview

The Microchip Technology 1N5285UR-1/TR is a current regulator diode in the MIL-PRF-19500/463 qualified series. It provides a nominal regulating current of 0.27 mA with a maximum limiting voltage of 1 V and a steady-state power dissipation of 500 mW. The device operates within a junction temperature range of -65°C to +175°C and utilizes a hermetically sealed DO-213AB (MELF) surface-mount package.

Feature Summary

• Hermetically sealed glass case with internal metallurgical bond for radiation hardness
• JEDEC registered surface mount equivalent of axial-leaded 1N5283 series
• Regulates current over a broad operating voltage and temperature range

Applications

• Military and aerospace circuits requiring MIL-PRF-19500/463 qualification
• Current limiting applications in harsh environments
• High source impedance biasing networks

Procurement Notes

Verify the specific reliability level required, as the base part number covers JAN, JANTX, JANTXV, and JANS qualifications. Confirm RoHS compliance status, as commercial versions are available while military grades may not be compliant. Ensure the ordering suffix matches the desired packaging and qualification tier before procurement.

Selection Notes

Select this component when a stable current source is needed across varying voltages rather than a fixed voltage reference. Consider the 0.27 mA nominal current and 1 V knee voltage limits. Verify that the DO-213AB package dimensions fit the PCB layout and that the thermal resistance requirements are met for the intended power dissipation.

Part Context

This device belongs to the 1N5283UR-1 through 1N5314UR-1 series of 0.5 watt current regulators. The series offers a selection from 0.22 mA to 4.7 mA in standard 10% tolerances. It serves as a counterpart to Zener diodes by regulating current over a broad voltage range instead of voltage over a broad current range.

Replacement Considerations

Direct replacements include other members of the 1N5283UR-1 to 1N5314UR-1 series if different current values are acceptable. Axial equivalents such as the 1N5285-1 are available but require different mounting considerations.