1N5285

Overview

The Microchip Technology 1N5285 is a silicon current regulator diode designed for through-hole mounting in the DO-7 axial package. It provides a regulated current of 279 µA with a maximum knee impedance of 1,950,000 Ω and a maximum limiting voltage of 1 V. The device supports a peak operating voltage of 100 V and dissipates up to 500 mW. It operates within a junction temperature range of -55 °C to 175 °C. This component is classified as a single-element current regulator diode.

Feature Summary

• Maintains stable current regulation across varying load conditions
• Supports high-temperature operation suitable for demanding environments
• Utilizes glass encapsulation for robust physical protection

Applications

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

Procurement Notes

Verify compliance requirements before procurement, as this specific part number is noted as not RoHS compliant in available documentation. Confirm availability status directly with authorized distributors or the manufacturer, as supply may be restricted or subject to long lead times. Ensure the DO-7 axial package matches the target PCB footprint and that the 279 µA regulation value meets circuit design specifications.

Selection Notes

Select the 1N5285 when a precise low-current regulation of approximately 279 µA is required without active components. Consider the 100 V maximum voltage rating and 500 mW power dissipation limits during thermal analysis. Verify that the axial DO-7 package fits the mechanical constraints. For applications requiring different current levels, review other variants within the 1N528x series.

Part Context

The 1N5285 belongs to the 1N528x family of current regulator diodes manufactured by Microchip Technology. This series includes various models with different regulated current values, such as the 1N5283 (242 µA) and 1N5285-1 (297 µA). These devices share similar electrical characteristics and packaging options, serving as passive alternatives to active current sources in analog circuit designs.

Replacement Considerations

The 1N5285-1 serves as a related variant with a slightly higher regulated current of 297 µA. Direct substitution requires verifying if the increased current tolerance aligns with the application's requirements. Other members of the 1N528x series offer different current ratings but maintain similar voltage and power specifications.