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Components: Help with Photo

Discussion in 'Electronic Basics' started by Caliban, Sep 12, 2003.

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  1. Caliban

    Caliban Guest

    Can anyone identify the two (literally) black boxes in the bottom photo of
    site ?

    This is a photo of the "guts" of a 1991 Honda Civic ignitor (a.k.a. ignition
    module and igniter).

    My guess is that one of the black boxes is an NPN transistor. The other may
    be a signal converter. But I could be way off. These guesses are based on a
    lot of reading about car ignitors and the following two schematics:

    That at .

    And that at the bottom of .
    The latter is a General Motor car's ignitor etc. schematic. It may at least
    resemble the Honda's and be helpful.

    Comments on the other parts are welcome. :)
  2. Ben Weaver

    Ben Weaver Guest


    The top one looks like a BUB941ZT made by ST. It's an NPN power
    darlington high voltage ignition coil driver. Datasheet is at:

    The bottom chip seems to be an application specific one. Not sure who
    it's made by, but the part number is U2226B. It comes from a family of
    ignition transitor drivers: U2225B is controlled by an inductive sensor,
    U2226B is allegedly driven by a microcontroller, and the U2227B is
    controlled by a phototransistor.

    Hope that helps a bit!

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