General > General Technical Chat
Identifying SMD by Code
fanzam:
Mosfet was my first guess however I cannot find any Mosftet that has this package (SC70-5 or SOT353).
Yes, a mosfet can be used as a trigger switch. Mosfet normally are marked as a normal transistor since they are transistor after all (Q), however I have seen many weird markings on PCB, normally I do not pay attention to silkscreen and I just check the schematic but in this case I do not have it.
I have checked the traces on PCB and notice the coils of the 3 relays are going to a 8ch Darlington Sink Driver (ULN2803APG) so this FT1 , 2 and 3 has nothing to do with relays.
I believe this is more something to do with the Coded Magnetic Sensors circuit to stabilize the voltages.
Thanks once again
Mark
fanzam:
Hello ,
I have tried my best to create a schematic without removing any components.
The Coded sensor is 4 wire and 2 of the wires are common.
I have done a Schematic Diagram to understand better the circuit in the hope to get this Part number for FT2.
This FT2 all it does send a signal to the MCU if door is Opened or Closed.
After searching several SMT catalogs I manage to find 1 datasheet with FA part number HD74HCT1G14 however the pinout does not match, my GND is on pin 2 and this one I found is on pin3.
If anyone have any idea what I should do next please let me know since I am stuck with this project.
Thanks in advance
Regards
Mark
shakalnokturn:
I'm relaying the tip learnt from someone else out here:
Try the Taobao website searching with package type(s) and all or part of marking code. Photos help to identify.
fanzam:
Thanks for your suggestion unfortunately I already tried that with no success.
I found this part number NZF220DFT1G which looks promising.
Shall I try this or I will see Magic smoke ?
At this Stage I cannot measure any voltages or signals since I do not have a working circuit but I can only guess.
Regards
Mark
SiliconWizard:
Well, if you're positive pin 2 is connected to GND on your board, and that no voltage exceeds the max rated voltage of this chip, I see no reason for magic smoke. (Well, there could be: pin 3/pin 4 and pin 1/pin 5 will basically get shorted through a ~100 Ohm resistance (approx.) Probably not enough to cause magic smoke at those low voltages though.)
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