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New packaging for power electronics

John Day

John Day

Posted Jan 30, 2012

Infineon Technologies notes that higher performance power electronics components contribute to the primary automotive industry goals of better fuel efficiency and lower emissions. The firm suggests that power MOSFETs with current capability above 200A and R DS(on) below 1mΩ are needed to reduce conduction losses and improve overall efficiency, but it says that MOSFETs to fulfill these needs have not been available in the automotive market – until now.

To help achieve the needed efficiency, Infineon has introduced a new package technology compliant with JEDEC standard H-PSOF (Heatsink Plastic Small Outline Flat lead). It says the new package decreases package resistance and increases current capability compared with D 2PAK (TO-263). The new package’s footprint is also about 20 percent smaller and its height almost half that of the D 2PAK.

According to Infineon, its H-PSOF package is better suited for high-current applications such as battery management for hybrid vehicles, electric power steering (EPS), active alternators, and other heavy load applications. Strategy Analytics predicts that the market for EPS and start/stop systems will grow from about 47 million units in 2011 to about 110 million in 2016 – a compound annual growth rate of about 19 percent.

The first products using the H-PSOF package technology are 40V OptiMOS™ T2 power transistors offering up to 300A current capability and R DS(on) values of 0.76mΩ. Infineon describes those specifications as a new milestone. The IPLU300N04S4-R7, a member of the 40V OptiMOS T2 automotive power transistor family, offers a continuous drain current (I D) of 300A with R DS(on) of 0.76mΩ. Additional 40V and 30V automotive MOSFETs in H-PSOF packages are in the works.

The H-PSOF package design is said to ensure a good wetting for reliable soldering, and Infineon says it’s possible to control soldered leads by using Automatic Optical Inspection (AOI), which is usually part of a Surface Mount Technology (SMT) production line.

Power devices in the H-PSOF package are AEC-Q101-qualified.

electric power steering, Infineon Technologies, D2PAK (TO-263), Strategy Analytics, JEDEC standard H-PSOF, power MOSFETs

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John DayJohn Day recently launched John Day’s Automotive Electronics News ( to provide news and feature coverage of the automotive electronics industry. Earlier he wrote for Auto Electronics magazine, Auto E-lectronics, EE Times, and other business and engineering publications. Visit John Day

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