Electronicdesign 6227 0716diodesinc

Small-Signal Bipolars Help Shrink Portable Designs

July 19, 2013
Two complementary pairs of small-signal bipolar NPN and PNP transistors in miniature DFN0806-3 package.

Two complementary pairs of small-signal bipolar NPN and PNP transistors from Diodes, the MMBT390xFA and BC8x7BFA are initially provided in the miniature DFN0806-3 package, with pre-biased (digital) transistors to follow. With a footprint of 0.48 mm² and an off-board profile of 0.4 mm, the transistors are 20% smaller than equivalent DFN1006, SOT883 and SOT1123 parts. The bipolar’s size advantage, coupled with a 400 mW power dissipation capability, assures that it will benefit smartphone, tablet and other space-critical portable product designs. The NPN MMBT3904FA and PNP MMBT3906FA transistors are 40 V VCE rated, handle a continuous current of 200 mA, and support a 500 mA peak pulse current. The NPN BC847BFA and PNP BC857BFA devices are 45 V rated and have continuous current and pulse current handling capabilities of 100 mA and 200 mA, respectively. The MMBT3904FA, MMBT3906FA, BC847BFA and BC857BFA bipolar transistors are priced at $0.08 each/10,000.

DIODES INC.

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