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  1. Any good Substitutes for an NPN Silicon 4-pin Transistor?

  2. What's the story with a BJT that has four pins? I found …

    The transistor is AF138 (PNP, Germanium). I've never seen a fourth pin before on a BJT and the website with the data sheet doesn't indicate what "S" means. …

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    • PC817 Optocoupler Pinout, Datasheet, Equivalent, …

      2020年2月10日 · Optocouplers also called photocouplers & opto isolators, they are IC type looking components available from 4 pins to many numbers of pins, they are mostly used for isolating of two circuits from each other. PC817 is a …

    • PC817 IC Pinout, Features, Equivalent & Datasheet

      2018年5月27日 · PC817 Photocoupler has a transistor which is controlled based on light (photon). So this IC basically has an IR LED and a photo-transistor inside it

    • Transistor Pinouts: A Comprehensive Guide – Flex PCB

      2024年5月22日 · This comprehensive guide has covered the common transistor package types, the pinouts for bipolar junction transistors (BJTs) and field-effect transistors (FETs), and how to interpret transistor datasheets.

    • Wholesale 4 pin transistor And Transistors For Circuits - Alibaba.com