1N4255SM

Overview

The Microchip Technology 1N4255SM is a high-voltage standard recovery rectifier diode designed for demanding applications. It features a working peak reverse voltage of 2000 V and an average rectified forward current rating of 0.25 A at 55°C ambient temperature. The device utilizes a voidless hermetically sealed glass package with tungsten slugs, ensuring robust construction and low thermal resistance. Electrical characteristics include a maximum forward voltage of 3.5 V at 100 mA and a minimum breakdown voltage of 2400 V.

Feature Summary

• Hermetically sealed voidless hard glass package with tungsten slugs for extreme durability
• Triple-layer passivation providing the lowest available reverse leakage current
• Absolute high voltage and high temperature stability across operating ranges
• Inherently radiation-hardened construction suitable for harsh environments

Applications

• High-reliability military systems requiring MIL-PRF-19500/279 qualification
• X-ray machines and radar equipment power supplies
• Voltage multipliers and bridge rectifier circuits
• Catch diodes in high-voltage transmitter stages

Procurement Notes

Verify specific ordering suffixes to confirm RoHS compliance status, as commercial versions may differ from non-RoHS variants. Ensure the procurement specification explicitly requests the S package configuration. Confirm that the required reliability level matches the commercial grade specifications provided in the datasheet. Cross-reference the part number against the latest manufacturer documentation to ensure availability of the correct termination finish.

Selection Notes

Select this component when a 2000 V reverse voltage rating is required alongside a 0.25 A forward current capacity. The hermetically sealed glass construction makes it suitable for environments where moisture or radiation could compromise standard plastic packages. Consider the thermal resistance and lead length requirements for heat dissipation in your specific circuit layout. Verify that the 3.5 V forward voltage drop aligns with your efficiency targets.

Part Context

This diode belongs to the 1N4254 through 1N4257 series of high-voltage rectifiers manufactured by Microsemi (now Microchip). These devices are JEDEC registered and share common mechanical and electrical traits within the family, differentiated primarily by their specific working peak reverse voltage ratings. The series is engineered for applications where failure is not an option.

Replacement Considerations

Direct replacements within the same series include 1N4254, 1N4256, and 1N4257, which offer different reverse voltage ratings but identical current handling and package styles. For higher voltage requirements, consider the 1N5181–1N5184 series, though these have lower current ratings. Ensure any substitute maintains the hermetically sealed glass construction if environmental sealing is critical.