This note outlines the features, benefits and applications of the Zetex PNP SuperSOT series, plus some additional NPN applications, and follows on from application note AN11 which covered the low voltage variant NPN types FMMT618 and FMMT619.

Since AN11 (Features and Applications of the FMMT618 and FMMT619) detailed how Zetex achieved the exceptional current and saturation voltage performance given by the SuperSOT range, package characteristics and chip design will not be repeated in this note.

The first feature to note is that these SOT23 transistors are capable of dissipating 625mW - around twice the industry standard for SOT23 packaged products. Achieved using a custom lead frame, this means that for a given power dissipation a Zetex SuperSOT chip will run cooler than any competitors’ SOT23 devices. This gives improved reliability and the option to reduce PCB area if desired.

Secondly, the saturation voltages are the lowest of any SOT23 of comparable BVCEO in the market place today and lower than many competitors SOT89 and SOT223 types. This translates to lower power dissipation in switching applications, again giving improved reliability and smaller PCB areas.

Read and download: http://www.zetex.com/3.0/appnotes/apps/an12.pdf

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