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JohnA
Joined: 29 Jan 2018
Posts: 418
Location: Geelong Australia
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 Posted: Sun Mar 11, 2018 10:18 pm Post subject: Marking on back of Intel DIP's |
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Hi,
I was wanting to know if D8749H Microcontrollers should normally have markings on the back?
The D8749H shown looks like it has an FPO number L6260237, >> Malaysia - week 26 1986, do all IC's with an FPO then not have marking on the back?
I just wanted to make sure this is genuine, but I am thinking it would be really hard to forge the MCU under the window!
I just really want to know more about marking in the back of intel IC's in general. Did they stop marking the backs of DIP's and when did this stop. Was it when FPO markings started?
Thanks. |
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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| Posted: Mon Mar 12, 2018 12:26 am Post subject: |
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They usually do, though some late chips don't, yours may very well be a 1996 production chips rather which would explain the lack of marking on the back.
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JohnA
Joined: 29 Jan 2018
Posts: 418
Location: Geelong Australia
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| Posted: Mon Mar 12, 2018 2:02 am Post subject: |
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Thank you john,
Like a lot of these things, it looks to be a bit of an enigma except for those at the controls of Intel at the time! |
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crusty_dog
Joined: 03 Apr 2015
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Location: Australia / Singapore
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| Posted: Mon Mar 12, 2018 2:29 am Post subject: |
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by the copyright ('80) the FPO will be for 1986
to be 1996 the copyright have to be 1980 |
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CPUShack
Joined: 16 Jun 2003
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Location: State of Jefferson, USA
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| Posted: Mon Mar 12, 2018 2:50 am Post subject: |
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| crusty_dog wrote: | by the copyright ('80) the FPO will be for 1986
to be 1996 the copyright have to be 1980 |
ahh yup, def 1986 then. Possible the markings got rubbed off, or they just got forgotten, when ya make millions of chips it happens.
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JohnA
Joined: 29 Jan 2018
Posts: 418
Location: Geelong Australia
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| Posted: Mon Mar 12, 2018 4:04 am Post subject: |
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Or it is remarked... from some similar MCU or EPROM?
sourced from Chinese parts supplier..
It is hard to verify the die, at least you can see it... |
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JohnA
Joined: 29 Jan 2018
Posts: 418
Location: Geelong Australia
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| Posted: Mon Mar 12, 2018 5:37 am Post subject: |
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Here is a closer picture of the die.
I am not sure what it should look like, if anyone has one of these and can compare it for similarity that would be appreciated.
Picture taken with iphone X. |
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CPUShack
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