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I am looking for the SMD below. Code "46" and vertical "L".

It is used in a latch circuit and could be a NAND gate or equivalent, something like a flip-flop circuit.

Here is the link to a circuit using this IC.

Any ideas?

enter image description here

ocrdu
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user2053949
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    Hello and welcome. do you have any more information? How old is the equipment and where was it made? Could you post a picture of any of the surrounding circuitry? An image this close up doesn't have very many clues. – jonathanjo Apr 14 '23 at 08:57
  • I just edited the post with a link to Pololu circuit – user2053949 Apr 16 '23 at 08:13

1 Answers1

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It appears to be a MBT3946 NPN-PNP transistor pair. datasheet.

enter image description here

The other transistors on that board appear to be: MUN2211 (8A) transistor with input resistors datasheet. (Found pretty easily through Ultimate SMD Database)

You can confirm by tracing out portions of Pololu board per your link, and comparing with their input circuit descriptions, in particular CTRL to base of an NPN through 4K7 resistor.

enter image description here enter image description here

jonathanjo
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  • Thank you very much ! I didn't know Ultimate DMS Database ! My initial goal was to replace the MUN2211 by BC846 & resistors. For the MBT3946 I was in the fog ! Thank you ! – user2053949 Apr 18 '23 at 10:43