1N5285/TR

Overview

The 1N5285/TR is a current regulator diode manufactured by Microchip Technology, designed for through-hole mounting. It operates within the DO-35-2 package and provides a regulated current of 279 µA with a maximum peak working voltage of 100 V. The device dissipates up to 500 mW of power and functions reliably across an extended temperature range from -65 °C to +175 °C. Supplied in tape and reel packaging, this component serves as a stable current source for electronic circuits requiring precise low-current regulation.

Feature Summary

• Maintains constant current output regardless of voltage fluctuations within specified limits
• Operates effectively in extreme thermal environments suitable for harsh conditions
• Utilizes glass-passivated junction technology for enhanced reliability

Applications

• Constant current sources for LED biasing
• Current limiting protection in sensitive circuitry
• Biasing elements for transistor amplifier stages

Procurement Notes

Verify the specific suffix /TR indicates tape and reel packaging configuration before ordering. Confirm that the 279 µA nominal current aligns with design requirements. Ensure the DO-35-2 through-hole footprint matches the PCB layout. Check for any military or aerospace qualification prefixes if higher reliability standards are required for the application.

Selection Notes

Select this component when a fixed low-current regulation is needed without active feedback loops. Compare the 279 µA value against other variants in the 1N528x series if different current levels are acceptable. Consider the 100 V breakdown voltage limit to ensure it exceeds the maximum potential voltage drop across the load in the intended circuit topology.

Part Context

This part belongs to the 1N528x series of current regulator diodes produced by Microchip Technology. These devices are standard replacements for older industry equivalents, offering consistent performance in discrete semiconductor applications. The series covers various current values, with the 1N5285 specifically targeting the 279 µA regulation point.

Replacement Considerations

Direct substitutes include other manufacturers' 1N5285 equivalents. Verify pinout compatibility and thermal characteristics when cross-referencing with generic current regulator diodes from alternative suppliers.