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I am hoping someone can help me figure out a part number for this component or something else that might be compatible. Unfortunately, I do not have the schematic and the original component has a bit of a burn mark on it. All I could read was V108 on the top line. The second line which perhaps was a date code was not legible. After trying to clean the burn make with Iso, even the top line is not quite readable anymore in the photo .
There was a dot to mark identify pin 1 (bottom right corner of the sketch). The dimensions of this component are approx. 2.85mm wide x 2.35mm high.The package appears to be flat with no gap between the PCB and the component and I do see some solder but no real legs sticking out the sides. It is 8 positions (4 on top and 4 on the bottom).
Vin in this application is 5VDC and Vout is 3.3VDC. Any of the pins that I have identified as Vin could actually be an enable or other type of input that expects the same voltage as Vin for the converter to put out the 3.3V.
I have tried to search for this at the following sites with no luck so far:
smd.yooneed.one
This is a sketch of what I have been able to figure out as to how it is connected in the circuit:
Vince1,
I need to know the case type of chip.
To do this, you need to unsolder the chip and show the bottom.
I also need a photo of the contact pads on the board after unsoldering the chip.
Thanks.
Vince1,
The task is very difficult, we do not know what the marking was and how many lines there were in the marking.
Therefore, we need to find out the purpose of the microcircuit.
What is it, a DC-DC Converter, a Power Distribution Switch, and so on?
To do this, you need to draw the most correct diagram with elements around the microcircuit.
Only then will we be able to choose the right option.
P.S. Take a photo of the chip with a large number of surrounding elements.
Thanks for identifying the package type Adam. It certainly seems to look right. I had tried to look up the package but was unable to find it. Is there some document or website that you use to find the package type?
I will post photos as requested and also sketch out the schematic better. To answer some of your other questions in the mean time:
-There were two lines in the marking, top line was V108. Second line is what was burnt off.
-The purpose of this component is definitely to supply 3.3VDC using the incoming 5VDC.
I had another board for a similar device but built at a slight different time. In this other board, the manufucturer replaced this one components as well as some of the adjoining components but it is identified with the same identification of IC122 and so probably serves the same purpose and I was able to verify that it is supplied 5V and puts out 3.3VDC. The marking on this alternate component which has a different package is:
D9A
300
ZR
The closest datasheet I was able to pull up for the above is
As this is a different package and is working, I was not looking for a replacement for it so did not try to find the accurate part number and datasheet for it. However the Rohm datasheet above matches many of the pins that I did check on that board. Interestingly, when I search for components using the TSMT8 package, Rohm pulls up quite a bit.
Very interesting case.
I can’t find any microchips in TSMT8 package.
TSMT8 package contains only MOSFETs.
Maybe I made a mistake in defining the package?
Definitely need to sketch out a diagram.
I am pretty sure your identification of the package is accurate. I checked the thickness as well just now and it is 0.8mm so in line with the dimensions you provided. This PCB was manufactured in July of 2014. The second board that I have with a different component and layout was manufactured in April of 2018. So my guess is the original component is an older component, possibly from Rohm because of the package type and because the newer one is most likely also from Rohm. However the older one I am looking for is perhaps too old and out of production.
.
