onsemi

S3N

S3N Description

The S3N from onsemi is a general-purpose diode designed for high-voltage applications, offering a 1200V reverse voltage (Vr) and 3A average rectified current (Io). Packaged in a surface-mount SMC (TO-277A) form factor, it features a low forward voltage drop (1.2V @ 3A) and minimal reverse leakage (5µA @ 1200V), ensuring efficient power handling with reduced losses. Its 60pF capacitance @ 4V and 2.5µs reverse recovery time (trr) make it suitable for medium-speed switching. Though classified as "Not For New Designs," it remains a reliable choice for legacy systems requiring high-voltage rectification or freewheeling diode functions.

S3N Features

• High Voltage Rating: 1200V DC reverse voltage (Vr) for robust performance in demanding circuits.
• Low Power Loss: 1.2V forward voltage (Vf) at 3A minimizes heat generation.
• Fast Recovery: 2.5µs trr balances speed and efficiency for switching applications.
• Surface-Mount SMC Package: Compact and compatible with automated assembly (Tape & Reel).
• Compliance: ROHS3 and REACH unaffected, with ECCN EAR99 for global usability.
• Low Leakage: 5µA reverse leakage ensures stability in high-voltage blocking.

S3N Applications

• Power Supplies: AC-DC rectification in industrial SMPS or UPS systems.
• Energy Management: Freewheeling diodes in motor drives or inverters.
• Legacy Electronics: Maintenance or repair of older high-voltage equipment.
• Automotive Systems: Auxiliary circuits requiring 1200V isolation.
• Renewable Energy: Solar inverter clamping or protection circuits.

Conclusion of S3N

The S3N is a cost-effective, high-voltage diode optimized for efficiency and reliability in medium-speed applications. While not recommended for new designs, its low Vf, high Vr, and SMC packaging make it ideal for retrofitting or sustaining existing systems. Its compliance with environmental standards and balanced performance ensure longevity in industrial, automotive, and energy sectors. For engineers seeking a proven solution for 1200V rectification, the S3N remains a pragmatic choice.