RS 4FS

Single Diodes Overview

The RS4FS is a discontinued silicon mesa-type rectifier diode manufactured by Sanken Electric. It features an axial through-hole package with a maximum repetitive peak reverse voltage of 1500 V and a standard recovery time of 1 µs at the 90% recovery point. The device supports a maximum average forward current of 2.5 A with a heatsink or 1.5 A without one, and handles a 50 A peak surge forward current. Key electrical limits include a maximum forward voltage drop of 1.5 V at 3.0 A and a junction temperature range from -40 °C to +150 °C.

Single Diodes Feature Summary

• High-voltage capability with a 1500 V repetitive peak reverse voltage rating for robust blocking performance.
• Standard recovery characteristics suitable for general-purpose rectification and damper circuit applications.
• Robust thermal design allowing operation up to a 150 °C junction temperature.

Single Diodes Applications

• Damper circuits
• General purpose rectification

Single Diodes Procurement Notes

This component is officially discontinued and not recommended for new designs. Verification of availability requires checking authorized distributors for existing stock or obsolete inventory. Procurement should focus on identifying verified surplus sources rather than direct manufacturing orders. Ensure that any sourced units match the original Sanken specifications and marking requirements before integration into legacy systems.

Single Diodes Selection Notes

Designers must account for the derating curves provided in the datasheet when selecting operating conditions. The average forward current decreases significantly as ambient temperature rises above 60 °C without a heatsink. Thermal resistance between the junction and lead is limited to 8 °C/W. Selection should prioritize applications where high voltage blocking and standard recovery times align with system requirements, acknowledging the part's obsolete status.

Single Diodes Part Context

The RS4FS belongs to the Sanken Electric rectifier diode family, specifically designed as a silicon mesa-type device. It utilizes a resin-molded axial package compliant with UL94-V0 flammability standards. The component is marked with the type number and lot information in yellow ink, indicating production date codes. This specific part represents a legacy solution for high-voltage rectification tasks previously supported by the manufacturer.

Single Diodes Replacement Considerations

The BY228GP-E3/54 from Vishay General Semiconductor is documented as a similar replacement part. Users should verify pin compatibility and electrical parameters against the original RS4FS specifications before substitution.

Single Diodes FAQ

What is the reverse recovery time specification for the RS4FS?

The reverse recovery time (trr) is specified as a maximum of 1.0 µs at the 90% recovery point with IF=IRP=100mA, and 0.4 µs at the 75% recovery point under different test conditions.

How does the average forward current rating change with temperature?

The average forward current is rated at 2.5 A at 60 °C with a heatsink and 1.5 A at 60 °C without a heatsink. The current must be derated as the ambient temperature increases beyond these points.