2SK1529_2SJ200 markings - diyAudio
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Old 28th January 2011, 09:28 AM   #1
DaveG is offline DaveG  United States
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Default 2SK1529_2SJ200 markings

I'm not clear on the Vgs classification markings on these. Data sheet shows 2 versions: O & Y.
Sellers mostly seem to only list these devices as 2SJ200 or 2SK1529 with no mention of the O or Y. Also, no mention of the "P" on the data sheet.

What do the 3 different markings in the photos represent?
Is the "PY" the same as "Y"?
The middle photo must be the "O" version, correct?
thanks-
Attached Images
File Type: jpg J200 P Y_K1529 P Y.jpg (45.0 KB, 126 views)
File Type: jpg K1529_J200.jpg (71.7 KB, 125 views)
File Type: jpg K1529Y_J200Y.jpg (62.5 KB, 121 views)
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Old 28th January 2011, 06:31 PM   #2
HighTec is offline HighTec  Croatia
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Hi Dave,

yes, according to Toshiba's datasheet, there is only Y and O on VGS classification. The 1st picture looks suspicious and smells nasty, probably fakes. On the second pic are definitely counterfeits but on the 3rd are probably genuine transistors. Anyways, I would avoid those transistors with PY markings.

Click the image to open in full size.
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Old 28th January 2011, 07:03 PM   #3
DaveG is offline DaveG  United States
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Hello, and thanks for the reply. I was not suspecting fake parts, but I guess it could be possible. I have several from a reliable source with the PY markings, so I’ll assume it is some other variation or grading for now.
I assume they were also manufactured at a few different plants with many different date codes, so there is all sorts of room for small marking variations.
Dave
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Old 28th January 2011, 07:31 PM   #4
HighTec is offline HighTec  Croatia
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Hi,

if you have a reliable source, then it's OK.
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Old 28th January 2011, 08:19 PM   #5
DaveG is offline DaveG  United States
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So the original question is still unanswered. What do the markings equal.
thanks
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Old 28th January 2011, 08:28 PM   #6
WuYit is offline WuYit  Sweden
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Hi,
P sometimes appears on the P-channel devices. The Vgs classification marking should always be there.
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Old 28th January 2011, 08:30 PM   #7
DaveG is offline DaveG  United States
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yes-but it is on both parts
Dave
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Old 28th January 2011, 11:50 PM   #8
DaveG is offline DaveG  United States
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anyone know what the P equals?
thanks
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Old 29th January 2011, 12:33 AM   #9
WuYit is offline WuYit  Sweden
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Dave,
look I`m not sure. The line indicates lead-free device. I`m especially suspicious about the ones in the second picture, the circles should be blank, the dot should be there, the leg tooling is different as well.
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Old 31st January 2011, 08:45 AM   #10
DaveG is offline DaveG  United States
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Hi WuYit, and thanks for your information,
I'm not sure about the lead-free designation. Could it be just the P? It is difficult to find older catalogs of Toshiba devices that show the markings used, and I could not find an older lead-free standard that gave me any new information. I looked at photos of about 20 older similar Toshiba devices, and many did not have a "P", or a line. If the P equals an older lead-free marking, I would think it would show up on other devices.

I am also not sure how the "O" version is marked, only because I have never seen one. I was hoping the center photo was an example, thinking maybe Toshiba only marked the "Y" devices.

Maybe this whole thing is just a stupid question , but I like to know the details.

I am going to email some brick and mortar businesses with the question. I just want to insure that all the devices I purchase are the same classification.
Dave
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