General > General Technical Chat
Identifying SMD by Code
Yansi:
--- Quote from: ataradov on November 17, 2019, 07:44:24 pm ---
--- Quote from: Yansi on November 17, 2019, 07:37:02 pm ---It is not SOT23-5. Look at the real SOT23 near it.
This is a SC70, or thereof.
--- End quote ---
The package nomenclatures confuse me a lot. I just use parts that I've used personally as a reference. I have never seen a part that would be of the same size as your typical 3-pin SOT-23 with 5 pins.
The LDO I use all the time MIC5504-3.3YM5-TR comes in the same small package. The datasheet calls it SOT-23-5. On the digikey it is described as "Package / Case: SC-74A, SOT-753", "Supplier Device Package: SOT-23-5".
But calling those smaller packages "SOT-23-5" for search purposes was more useful than not, so I personally will continue to do so.
--- End quote ---
It is not that useful, especially when you know it is not true.
SOT23 is always SOT23 size, and there are 3, 5, 6 and even 8 pin variant of it. The plastic body is still the same size (3mm wide). 4 pin variant of SOT23 exists too, but it is called SOT143 and one of the leads is wider.
Do not confuse SOT143 (3mm) with SOT343, that is the smaller brother of it (2mm wide body).
SC70 (2mm wide body also called SOT323) is the smaller brother of SOT23 (3mm wide body).
SC88 is I think a 5pin variant of SC70, and SOT363 is sometimes what a 6pin SC70 is called as.
If not enough confusion already, I think there is even smaller variant of all those, the SOT416 (1.6mm wide body). And all derivates of it.
//EDIT: There is indeed a metric crap ton of SOT23-5 devices sized exactly as SOT23. For example: MCP6001T-I/OT, 74LVC1G14DBV, .. etc. ... Just look around.
Also please account for manufacturing tolerance of couple tenths of milimeter, with these devices. The sizes mentioned above shall be the nominal ones.
fanzam:
Hi all ,
Thanks for your kind reply.
Yansi Is correct this matches my dimensions since 100% it is not sot23-5.
From datasheet I can confirm it is SC70-5 well done to spot that from the image.
Other hint I have is the silkscreen, FT for me stands for Mosfet but once again I am guessing.
I was hoping that these codes are unique, Trail and error is possible but what I should order to narrow this down.
I have 3 of these that are working fine so I can match with the new part.
Regards
Mark
SiliconWizard:
The LDO I pointed to was the only one I found with a "FAJ" marking, but I got ahold of its datasheet, and only the SOT23-5 package has a FAJ marking. The datasheet shows this same LDO exists in SC70/SC88 package, so it could have been, but with completely different markings... so, likely nope.
The best candidate so far appears to be what flolic pointed to above: ELM7SH14TB Schmitt Inverter (vendor: ELM technology). It's a single-gate inverter with Schmitt trigger input. Found the datasheet, and they come in SC-70-5 package, with FA marking, and the J being the lot number (possible values: A to Z), which is why it's marked at 90° probably. Of course it may also be something else. Looking at the circuit around may help figuring if it could at least stand a chance of being this single-gate (from its pin-out).
Datasheet: http://www.elm-tech.com/en/products/logic-ic-hs/elm7sh14xb/elm7sh14xb.pdf
Now I'm trying to figure out what the "FT" in the "FT1" reference could stand for if the part is the above.
fanzam:
Schmitt Inverter makes more sense then a Mosfet since I am not seeing any application for high amperage on this circuit since all it does control power to switch a relay.
This uses a Coded Magnetic Sensors in order to switch on / off the relay.
This PCB was designed by a small Company in Italy however all the markings on the PCB are correct , R = Resistor , U = IC and so on, I have never seen FT on a PCB but I am sure it mean something.
Regards
Mark
amyk:
FET ? If it's driving the relay, it could be one.
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