Compact MOSFETs For Electric Power Steering


Toshiba has started mass production of automotive 40V ultra-low Rds(on) MOSFETs in 5mm x 6mm packages with double-sided cooling for improved heat dissipation

Automotive systems increasingly require innovative electronic components to make them lighter in weight and minimize fuel consumption. This has led to an increase in the number of electronic control units (ECUs) and the demand of MOSFETs as switching components in the ECUs. For instance, there is a transition from traditional steering to electric power steering (EPS) systems that are fuel-efficient and space-saving.

New 40V MOSFETs For Automotive Applications

Toshiba is addressing this demand with the new “TPWR7940PB” and “TPW1R104PB”, 40V N-channel power MOSFETs using DSOP Advance (WF) packages with double-sided cooling capability. The MOSFETs are designed for automotive applications such as electric power steering (EPS), load switches and electric pumps.


The TPWR7940PB is a 40V max 0.79mΩ MOSFET in DSOP Advance(WF)L package, and the TPW1R104PB is a 40V max 1.14mΩ MOSFET in DSOP Advance(WF)M package.

The MOSFETs are built around the latest trench structure U-MOSIX-H process and are AEC-Q101 qualified.

Both DSOP Advance (WF)M and DSOP Advance (WF)L are 5mm x 6mm packages with 8 pins.

The top exposed area is about 8 in DSOP Advance(WF)M and about 12 in DSOP Advance (WF)L.

The maximum channel-to-top-plate thermal impedance is 1.5K/W for the TPW1R104PB and 0.93K/W for TPWR7940PB.

The company says the MOSFETs showcase excellent thermal performance by attaching the top exposed area of the transistors to a heatsink (such as a metal frame) via an insulating layer.

The DSOP Advance (WF)M and DSOP Advance (WF)L packages are footprint-compatible with an SOP Advance (WF) package that has no exposed top metal area.

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The DSOP Advance (WF)M and DSOP Advance (WF)L packages employ a wettable flank terminal structure that enables AOI (Automated Optical Inspection) of solder joints on PCBs. AOI is especially important in automotive applications where verification of soldering quality is required.


– Electric power steering
– Load switches
– Electric pumps


– Qualified for AEC-Q101, suitable for automotive applications
– Double-sided cooling package with top plate[3] and drain
– Improved AOI visibility due to wettable flank structure
– U-MOS IX-H series featuring low On-resistance and low noise characteristics

The mass production of both TPWR7940PB and TPW1R104PB started in August 2018.



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