Identifying Transistors for Power Supply

[vanel]

I have a power supply I'm trying to fix. I've narrowed it down to 2 bad transistors. They are marked ALG and BKD. They are smd sot23 package. Does anyone know what these are or how I can Identify them? Thank You!

[stj]

Re: Identifying Transistors for Power Supply

ALG - LM4040BEX3-2.1-T
BKD - AME8570AEETBF31Z
maybe
but they arent transistors - so you may be looking at them wrongly

[jiroy]

Re: Identifying Transistors for Power Supply

For the ALG :

[jiroy]

Re: Identifying Transistors for Power Supply

For the BKD : KTC8050S-D Bipolar Transistor

[stj]

Re: Identifying Transistors for Power Supply

contradicive answers.
welcome to the world of smd markings

[vanel]

Re: Identifying Transistors for Power Supply

Is having the schematic the only way to know for sure?

[PeteS in CA]

Re: Identifying Transistors for Power Supply

contradicive answers.
welcome to the world of smd markings

I blame the CIA and Mossad.

More seriously, even with a laser it's hard to mark much info on an ant dropping sized SMT component.

[stj]

Re: Identifying Transistors for Power Supply

Is having the schematic the only way to know for sure?

you can look at how a part is connected to the circuit to determine if for example, it's a transistor or a voltage regulator

[jiroy]

Re: Identifying Transistors for Power Supply

What I gave you is the 100% ... Read the "Marking code" in the datasheet , and so in any datasheet of the BDK ..

Hard luck stj ;

[stj]

Re: Identifying Transistors for Power Supply

nice try but you could read the datasheets of the part numbers i gave too.
truth is a lot of codes are used more than once.
my databook shows some codes relate to as many as 10 or more devices.
it's a total shitshow

[jiroy]

Re: Identifying Transistors for Power Supply

Show me something like this and it's no problem stj;

[stj]

Re: Identifying Transistors for Power Supply

why dont you just get yourself a book of smd markings?
i have a thread on the forum with a torrent for one.

[jiroy]

Re: Identifying Transistors for Power Supply

I Have hundreds of them , real books , online , companies original CDs , you just name it , lol ...

[stj]

Re: Identifying Transistors for Power Supply

yes.
well i used "Turuta SMD Databook 2014"

[harp]

Re: Identifying Transistors for Power Supply

Show me something like this and it's no problem stj;