I was browsing around and came across a chip with three transistors that I cannot understand. PMD9050D mosfet driver – an npn transistor and high-speed switching diode supplemented by an npn/pnp transistor pair connected as a silicon-controlled switch in a SOT457 (SC-74). Features include: General-purpose transistor and high-speed switching diode as driver Silicon-controlled switch to bypass ...
Read full article: What the heck is: PMD9050D
from Electronics Weekly http://www.electronicsweekly.com/blogs/engineer-in-wonderland/what-the-heck-is-pmd9050d-2016-09/
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