have you tried to read the datasheet?
The datasheet normally shows a picture of the chip and the pins relative to the orientation of either (a) the text, or, (b) a dot molded into one corner, or (c) a bevel molded into one of the longer edges on the top of the chip. Read the datasheet. The datasheet will tell you exactly how it works for that specific chip.Hi all,
I'm using an INA193 current sense amp soldered onto a SOT23 to DIP adapter board. However I'm unsure as to which pin is number one? And in what order?
Picture attached. Please don't judge the soldering, rough and ready but it does the job for prototyping.
Thanks,
Jim
Good advice...much better than just asking "Have you read the manual" which accomplishes nothing. Here's a snip from a datasheet I found with Google.The datasheet normally shows a picture of the chip and the pins relative to the orientation of either (a) the text, or, (b) a dot molded into one corner, or (c) a bevel molded into one of the longer edges on the top of the chip. Read the datasheet. The datasheet will tell you exactly how it works for that specific chip.
If it is not listed on the datasheet, you should buy chips from a different manufacturer.
The TI drawing for this part specifies that the Pin 1 Index Area is optional. Presumably this is because the missing pin makes the orientation unambiguous.Good advice...much better than just asking "Have you read the manual" which accomplishes nothing. Here's a snip from a datasheet I found with Google.
View attachment 106060
Although I don't see a dot in the OPs photo, I assume that the part is oriented with pin1 at the lower left. If so, the blob of solder on pin 4 doesn't extend to pin 5 and does no harm.
When the part has three pins on one side, and two on the other, how do you suppose the part is oriented, even without having the #1 pin specifically marked?Thanks all, bar DannyF. What a daft thing to say. Of course I checked the data sheet, otherwise I wouldn't be asking in the first place. Christ!
The dot shown on the data sheet does not exist on the chip as Tracecom pointed out. Jpanhalt was spot on with his answer.
Thanks
Not as daft as you might think -- the sad reality is that a very high fraction of people that ask these questions have not bothered to read the data sheet (in some cases they don't even know that such things as data sheets exist, which shows the extreme range of backgrounds that people come here with).Thanks all, bar DannyF. What a daft thing to say. Of course I checked the data sheet, otherwise I wouldn't be asking in the first place. Christ!
The dot shown on the data sheet does not exist on the chip as Tracecom pointed out. Jpanhalt was spot on with his answer.
Thanks
As per the data sheet information. There's really no getting around that.When the part has three pins on one side, and two on the other, how do you suppose the part is oriented, even without having the #1 pin specifically marked?
What I meant was when the datasheet says pin one mark is at the top left corner when the three pins are on the left side, how could you get lost when that mark is missing? It´s still the same three pins with or without the pin 1 mark.As per the data sheet information. There's really no getting around that.
Ah. I thought you were asking the generic question of how you would determine which pin is pin 1 on an IC that has three pins on one side and two on the other.What I meant was when the datasheet says pin one mark is at the top left corner when the three pins are on the left side, how could you get lost when that mark is missing? It´s still the same three pins with or without the pin 1 mark.
A point that can be (and does get) pointed out to many of us around here from time to time.A bit of humility gets you a long way.
And pin 1 as well! A happy end.Sorry chaps, yes you seem to be right.
Thanks for the help, point noted
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