At first sight the performance of the FMMT618 and FMMT619 transistors may appear unbelievable for SOT23 packaged devices, however the following note describes how this has been achieved. The note also discusses a number of applications where they are ideally suited, which until now were often forced to utilise the larger SOT89 or SOT223 packaged devices.

No other manufacturer in the world offers similar performance parts to the FMMT618 and FMMT619 in SOT23. Even in the larger SOT89 and SOT223 packages, few devices are available that can match the current handling and low saturation voltage of the new Zetex range. This level of performance has been achieved by a unique combination of package and chip development.

Designed with heavy duty battery powered applications in mind, the 20V FMMT618 handles 2.5A continuously, giving a typical saturation voltage of only 130mV at this current. With a minimum hFE at 2A of 200 and at 6A of 100, this transistor is an ideal driver of heavy loads such as motors, lamps, IR LEDs etc. It is also very useful in saturation voltage critical applications such as supply switching and low voltage DC-DC converters.

Read more: http://www.zetex.com/3.0/appnotes/apps/an11.pdf

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