Achieving the same current handling capability as very much larger SOT223 equivalents, a new series of SOT23
packaged bipolar transistors from Zetex Semiconductors will significantly reduce PCB size. A move from SOT223’s
6.7mm x 7.3mm footprint to the 2.5mm x 3.05mm footprint of SOT23 provides a space saving of more than 80%.
Capable of switching loads of up to 400W, the initial offering of six
miniature devices comprises three NPN
and three PNP transistors, rated
at 50, 60 and 100V. The miniature ZXTN and ZXTP high power
transistors dissipate up to 1.2W of power, and support a continuous
collector current up to 5A,
combined with peak collector current up to
12A. These devices are ideal drivers of power MOSFETs, IGBTs,
motors, relays, solenoids and high power LEDs.
A very low saturation voltage also
ensures that power losses and circuit efficiency are optimised by the transistors. As an illustration, the 100V
ZXTN2020F is characterised by a VCE(sat) of just 50mV for a collector current of 1A.