ROHM Semiconductor Unveils 100 V Dual MOSFETs for Communication Base Stations and Industrial Applications

ROHM Semiconductor announced new dual MOSFETs that integrate two 100 V chips in a single package - ideal for fan motor drives applied in communication base stations and industrial equipment. Five models have been added as part of the HP8KEx/HT8KEx (Nch+Nch) and HP8MEx (Nch+Pch) series.

Recent years have seen a transition to higher voltages from conventional 12 V/24 V to 48 V systems in communication base stations and industrial equipment, intending to achieve higher efficiency by reducing current values. In these situations, switching MOSFETs requires a withstand voltage of 100 V to account for voltage fluctuations, as 48 V power supplies are also used in the fan motors for cooling these applications. However, increasing the breakdown voltage raises ON resistance (R_DS(on)) (which is in a trade-off relationship), leading to decreased efficiency, and making it difficult to achieve both lower R_DS(on) and higher breakdown voltage. Moreover, unlike multiple individual drive MOSFETs normally applied in fan motors, dual MOSFETs that integrate two chips in one package are increasingly being adopted to save space.

In response, ROHM developed two new series, the HP8KEx/HT8KEx (Nch+Nch) and the HP8MEx (Nch+Pch), that combine Nch and Pch MOSFET chips using the latest processes. Both series achieve the industry’s lowest R_DS(on) by adopting new backside heat dissipation packages with excellent heat dissipation characteristics. As a result, R_DS(on) is reduced by up to 56% compared with standard dual MOSFETs (19.6mΩ for the HSOP8 and 57.0mΩ for the HSMT8 Nch+Nch), contributing to significantly lower set power consumption. At the same time, combining two chips in a single package provides greater space savings by reducing area considerably. For example, replacing two single-chip TO-252 MOSFETs with one HSOP8 decreases footprint by 77%.

Next, ROHM will continue to expand its dual MOSFET lineup to withstand voltages ideal for industrial equipment while also developing low-noise variants. This is expected to contribute to solving social issues such as environmental protection by saving space and reducing power consumption in various applications.