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Author Topic: SMD Transistor Identification  (Read 3235 times)

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Offline BskitterTopic starter

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SMD Transistor Identification
« on: August 08, 2017, 11:43:44 am »
Hey Guys I am doing some work on a Computer Power Supply and I need to identify the control transistor for the relay circuit.



Can anyone please help me out ?

Byron
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Offline Kjelt

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Re: SMD Transistor Identification
« Reply #1 on: August 08, 2017, 11:53:16 am »
According to the smd code book (google ;) ) it is probably a FMMT-A42R high voltage transistor.
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Offline perieanuo

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Re: SMD Transistor Identification
« Reply #2 on: August 09, 2017, 07:58:42 pm »
No way, it's nfet or pnp/npn just verify relay wiring. If it's just relay bobbin any nfet or bipolar with Vcc/Ic respect will do

Envoyé de mon HUAWEI NXT-L29 en utilisant Tapatalk

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Offline floobydust

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Re: SMD Transistor Identification
« Reply #3 on: August 09, 2017, 09:01:58 pm »
I got SMD marking code 7E as PNP MMBTA92
I got SMD marking code 3E as NPN FMMTA42

OP should check if the emitter goes to GND, I expect that and an NPN.
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Offline Kjelt

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Re: SMD Transistor Identification
« Reply #4 on: August 10, 2017, 05:46:23 am »
What is the coil voltage of the relay?
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