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Transistors claim to reduce PCB space by half

Posted: 13 Mar 2014 ?? ?Print Version ?Bookmark and Share

Keywords:ROHM Semiconductor? transistor? portable device? smartphone?

ROHM Semiconductor has unleashed what it describes as the smallest transistors in the industry. The VML0604 package, according to the company, reduces board space by 50 per cent compared with similar devices, making it suitable for smartphones and other devices requiring smaller, thinner form factors.

The high precision package and transistor processes, combined with internal structure optimization, have allowed the company to develop, the VML0604, measuring just 0.6 x 0.4 x 0.36mm. As a result, mounting area is cut by half, making it ideal for high density applications in portable devices of all types. This package will be expanded to small-signal MOSFETs, contributing to increased space-savings in a variety of offerings, added ROHM.


As devices become smaller substrate mounting becomes increasingly difficult. In response, ROHM has maintained a 0.2mm terminal gap that facilitates mounting using existing equipment. Decreasing package dimensions places a limit on element size. As the transistor size decreases, ON resistance increases dramatically, making it difficult to maintain the performance of conventional small-signal transistors.

However, adopting the latest process from ROHM makes it possible to develop ultra-compact transistors featuring a maximum voltage of 30V along with 0.25? ON resistance (VGS=4.5V). Higher breakdown voltages in the 40-60V range are possible, even while maintaining low ON resistance.

The devices can be had for $0.84 per piece. Samples are available.

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