ROHM Unveils Low ON-Resistance N-Channel MOSFETs for Automotive Applications

ROHM has introduced a new lineup of N-channel MOSFETs – including the RF9x120BKFRA, RQ3xxx0BxFRA, and RD3x0xxBKHRB models – specifically designed for automotive applications requiring low ON-resistance. These MOSFETs are ideal for a range of uses such as motor control for doors and seat adjustments, as well as LED headlights. Initially, 10 models across three package types have been released, with plans to expand the range in the future.

The automotive industry is experiencing a significant increase in electronic components due to the rising demand for improved safety and convenience features. Simultaneously, there is a growing need for greater power efficiency to help reduce fuel and energy consumption. In the case of MOSFETs, which are crucial for switching applications in vehicles, the trend is towards lowering ON-resistance to minimize energy losses and reduce heat generation.

Building on its expertise in delivering low ON-resistance MOSFETs for both consumer and industrial applications, ROHM has extended its technology to meet the stringent reliability demands of the automotive sector. Using advanced medium voltage processes, ROHM has developed a series of 10 N-channel MOSFET models that deliver low ON-resistance, enhancing efficiency in automotive applications.

These new MOSFETs are available in 40V, 60V, and 100V voltage ratings and feature a split-gate structure that helps achieve lower ON-resistance, thereby improving operational efficiency. All models meet the AEC-Q101 automotive reliability standard, ensuring high durability and reliability in automotive environments.

To accommodate a variety of automotive applications, the MOSFETs are available in three different package types. For space-constrained systems, such as Advanced Driver Assistance Systems (ADAS), compact packages like the DFN2020Y7LSAA (2.0mm x 2.0mm) and HSMT8AG (3.3mm x 3.3mm) are ideal. For power-intensive automotive systems, the widely used TO-252 (DPAK) package (6.6mm x 10.0mm) provides an optimal solution. Additionally, ROHM has incorporated wettable flank technology in the DFN2020Y7LSAA package and gull-wing leads for the TO-252 package, improving mounting reliability.

ROHM has plans to further expand its medium-voltage N-channel MOSFET lineup to support even greater miniaturization and improved efficiency in automotive applications. Mass production of the DFN3333 (3.3mm x 3.3mm) and HPLF5060 (5.0mm x 6.0mm) packages is set to begin in October 2024, with 80V MOSFETs scheduled for release in 2025. In addition, ROHM is planning to introduce P-channel MOSFETs in the future.

Product Lineup & Application Examples

These MOSFETs are suitable for a variety of automotive applications, including:

• Vehicle motors (e.g., door control, seat positioning, power windows)
• LED headlights
• Car infotainment systems and displays
• Advanced Driver Assistance Systems (ADAS)

Availability and Pricing

The MOSFETs are currently available through online distributors such as DigiKey, Mouser, and Farnell, with a sample price of $3.50 per unit (excluding tax). These products will also become available through additional distributors as stock expands.

Key Terminology

• ON resistance (Ron): The resistance between the Drain and Source when the MOSFET is turned on. A lower ON-resistance means reduced power loss during operation.
• N-channel MOSFET: A type of MOSFET that conducts when a positive voltage is applied to the Gate relative to the Source. These MOSFETs are favored in the market due to their lower ON-resistance compared to P-channel MOSFETs, making them more suitable for a wide variety of circuits.
• Split Gate Structure: A technology that divides the MOSFET gate into multiple sections, which optimizes the flow of electrons and ensures fast and reliable switching performance.
• Wettable Flank Technology: A technique used to improve mounting reliability by plating the sides of the lead frame in bottom-electrode packages.
• Gull Wing Leads: A terminal design that extends outward from both sides of the package, providing excellent heat dissipation and enhanced mounting stability.

As ROHM continues to push the boundaries of MOSFET technology, the company’s expanding portfolio will offer more high-efficiency and space-saving solutions for the rapidly evolving automotive electronics market.