ROHM Introduces SiC Schottky Barrier Diodes with High Surge Resistance

Significantly improves efficiency in a variety of PFC circuits

ROHM has recently announced the availability of 3^rd generation SiC Schottky Barrier Diodes (SBDs) optimized for power supply PFC circuits in servers and high performance PCs.

The SCS3 series adopts a new structure that improves upon the industry-low VF characteristics of ROHM’s 2^nd Generation SiC SBDs (1.35V @ 25C) while providing increased surge resistance. This contributes to greater application efficiency, enabling support for power supply PFC circuits in servers, high-performance PCs, and the like.

In recent years, power components that provide higher efficiencies are being required in order to improve power conversion efficiency and energy savings in the power electronics market, which includes industrial power supplies, solar power systems, electric vehicles, and home appliances. Compared to conventional silicon products, SiC devices feature superior material characteristics, making them the preferred choice in power applications. In particular, in equipment such as servers where maximum power supply efficiency is demanded, the high-speed recovery characteristics of SiC SBDs have proven effective in increasing device efficiency when used in PFC circuits. Surge current resistance is also an important consideration in high power applications.

ROHM’s 1^st and 2^nd generation SiC SBDs continue to be well-received and regarded in the industry, but to expand applicability a new device structure was adopted that allowed ROHM to improve the industry-leading Vf characteristics of its 1^st and 2^nd generation products while also significantly increase surge resistance.

Key Features

1. High surge current resistance

ROHM’s new 3^rd generation SiC SBDs adopt a JBS (Junction Barrier Schottky) structure that provides higher surge current resistance with excellent leakage characteristics.

2. Industry’s lowest forward voltage (V_F=1.35V@25°C, 1.44V@150°C)

Optimized processes and device structure have made it possible to improve upon the industry’s lowest VF characteristics of ROHM’s 2^nd generation SiC SBDs, reducing conduction loss for greater efficiency and performance.

3. Low current leakage

Generally, as forward voltage is reduced reverse current leakage increases. However, ROHM’s new JBS structure minimizes leakage current along with forward voltage characteristics, resulting in 20x less leakage compared to 2^nd Generation SiC SBDs at the same rated voltage (650V、Tj=150℃).Lineup

ROHM’s 3^rd Generation SiC SBDs are currently available in the TO-220ACP package. A surface mount type (TO-263AB) is scheduled for future release based on market demands.

Applications

Power supply PFC circuits for PCs, servers, AC, and more.