Diodes Incorporated Unveils Miniature Automotive MOSFETS for Power Management, DC-DC Converters

September 16, 2019 by Gary Elinoff

The 40V-rated DMTH4008LFDFWQ and the 60V-rated DMTH6016LFDFWQ sport space-saving DFN2020 packages.

Diodes Incorporated’s two new automotive-compliant MOSFETs take up only 10% of the board space than do similar devices offered in SOT223 packages. This enables superior power density so critical in ‘under-the-hood’ automotive applications such as DC-DC converters, LED backlighting, and ADAS (advanced driver assistance systems.)


Image from Diodes Incorporated


The new N-channel FETs support continuous drain currents (ID) ranging from 7.6 amps to 11.6 amps. In their DFN2020 packages, both devices take up a scant area space of 2 mm by 2 mm, as compared to the 6.5 mm by 7 mm required by competing devices in SOT223 packages. In addition, the units offer a profile of only 0.6 mm.

Major applications for both units include:

  • Power management functions 
  • DC-DC converters 
  • Backlighting

Critical Specifications


  • Has a VDSS of 40 volts
  • Has a Qg (gate charge) of 14.2 nC
  • At VGS = 10 volts 
    • Has a maximum RDS(ON) of 11.5 mΩ 
    • At 25 °C, maximum ID is 11.6 amps
  • At VGS = 4.5 volts 
    • Has a maximum RDS(ON) of 18 mΩ 
    • At 25 °C, maximum ID is 9.3 amps

According to Diodes Incorporated, the DMTH4008LFDFWQ, when used in a typical application, such as a 12V, 5A buck converter, the unit dissipates 20% less power than comparable competitor MOSFETs.


  • Has a VDSS of 60 volts
  • Has an Qg of 15.2 nC
  • At VGS = 10 volts 
    • Has a maximum RDS(ON) of 18 mΩ 
    • At 25 °C, maximum ID is 9.4 amps
  • At VGS = 4.5 volts 
    • Has a maximum RDS(ON) of 27.5 mΩ 
    • At 25 °C, maximum ID is 7.6 amps

Largely because both of the new MOSFETs are packaged in the sidewall plated DFN2020, each are qualified for operation at 175 °C. This will be a boon to OEMs designing products destined for the automotive environment, with its high ambient temperatures.


Pin-out bottom view and schematic for the DMTH4008LFDFWQ and the DMTH6016LFDFWQ. Image modified from Diodes Incorporated

The DMTH4008LFDFWQ and DMTH6016LFDFWQ are both:

  • Automotive-compliant to AEC-Q101
  • Are totally lead-free and fully RoHS compliant 
  • Supported by PPAP for full traceability
  • Halogen and Antimony Free
  • Rated to a moisture sensitivity: Level 1 per J-STD-020 
  • Possess a UL Flammability Classification Rating 94V-0

Around the Industry

With the ever-increasing electrical and electronic content of today’s automobiles, it’s no surprise that Diodes Incorporated has many competitors in the field of automotive MOSFETs. Here are two similar automotive MOSFET devices.

Nexperia’s BUK6D43-60E is a 60 V, N-channel MOSFET available in a DFN2020MD-6 (SOT1220) package. Maximum drain current is 13 amps. Typical RDS(ON) is 43 mΩ. The device is AEC-Q101 qualified.

Toshiba offers three automotive MOSFETS, the SSM6K818R, SSM6K809R, and SSM6K810R. They feature VDS voltages of 30, 60 and 90 volts, respectively, with RDS(ON) values ranging of 19, 51 and 94 mΩ. They are AEC-Q101 conformed and are offered in a TSOP6F package

  • James Borders September 20, 2019

    You refer to the devices as “diodes” multiple times in this article, instead of calling them MOSFETs.

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    • S
      SR-71 February 04, 2020
      Diodes is the name of the company producing that MOSFESs.
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