Until we find two Tokins with the same number, those numbers should be considered as unique serial numbers and not as lot designation.
I also received from Tomo parts with very close serial numbers. I suppose numbers are not in sequence as he was pulling out some for perfectly matched sets. Or, it could be that they were packed that way from the factory.
I also received from Tomo parts with very close serial numbers. I suppose numbers are not in sequence as he was pulling out some for perfectly matched sets. Or, it could be that they were packed that way from the factory.
I have quite a few with sequential numbers. I don't know what properly constitutes a lot code, but obviously it would be digits on the left. I notice that the leftmost two also use alpha characters. Since it is a big die, it is reasonable to think that the wafer might hold only 100 transistors, and the middle two digits is the wafer number.
I have a suspicion
that every unmatched set one buys from Mr. Watanabe is in fact very roughly matched.
I’ve ordered from him two pairs in two separate shipments, to avoid customs taxes. Today, I’ve curve traced them with improvised method using two variable power supplies at fixed Vds of 25V and Vgs in range of -4 to -2.1 V.
Two close serial numbers were in different boxes (1X6971 & 1X6973). However, their Vgs for the same Ids was very different. But, SITs from the same box were relatively close. Vgs difference for the same current at whole measured range vas 0.1 V for one pair and 0.2 V for second pair.
Vgs difference between two pairs from different boxes was 0.9 V!
I suppose that all SITs he has were first roughly measured and then grouped for further precise matching. We are getting unmatched but still roughly sorted parts.
that every unmatched set one buys from Mr. Watanabe is in fact very roughly matched.
I’ve ordered from him two pairs in two separate shipments, to avoid customs taxes. Today, I’ve curve traced them with improvised method using two variable power supplies at fixed Vds of 25V and Vgs in range of -4 to -2.1 V.
Two close serial numbers were in different boxes (1X6971 & 1X6973). However, their Vgs for the same Ids was very different. But, SITs from the same box were relatively close. Vgs difference for the same current at whole measured range vas 0.1 V for one pair and 0.2 V for second pair.
Vgs difference between two pairs from different boxes was 0.9 V!
I suppose that all SITs he has were first roughly measured and then grouped for further precise matching. We are getting unmatched but still roughly sorted parts.
Your mobile phone does. Mine is smarter than me. 😀
Use Microsoft “Translator” application or Googe’s application. For Google translator, just point camera to the picture and it translates in the real time, even picture from jour PC screen.
Use Microsoft “Translator” application or Googe’s application. For Google translator, just point camera to the picture and it translates in the real time, even picture from jour PC screen.
So it sounds like just getting the unmatched ones may be the way to go. Since most of the builds using these VFETs have a way of adjusting for the unmatched ones. They may also not be that far off from each other either.
Hi, from Japan
I also have 10 TOKINs in the original box.
All of these have sequential numbers(1Z1612 - 1Z1621).
The label on the box says:
Name: SIT
Specifications: 2SK182ES
Lot number: -blank-
Container number: 16/50
Quantity: 10
TOKIN Corporation
I haven't tested these yet, so I'm not sure about matching.
Attachments
So, I shouldn't be too concerned that I had bought a pair of the 2SK182ES? Lol.
Choky,
Other than the data sheet with the matrix showing all the Tokin parts, is their a THF-51 data sheet?
Other than the data sheet with the matrix showing all the Tokin parts, is their a THF-51 data sheet?
Several hoop-jumps later:
From on-PC picture in post #630:
Product name SIT Specifications 2SK182ES
Container number 16/50
Lot number
Quantity 10
Tokin Corporation
Just as yoshida says.
don't thank me, I'm guessing same as you
but, as I said , that's only logical .......
I mean - it's so logical that it's logical even to me
but, as I said , that's only logical .......
I mean - it's so logical that it's logical even to me