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 Post subject: Interesting IC
PostPosted: Fri Feb 03, 2023 9:34 pm 

Joined: Mon Jan 09, 2023 10:08 pm
Posts: 18
Pic #1 I have a few boards with this IC that has it appears almost like a hologram of the letter H. I am new at this so maybe this is common. I was wondering of its significance.

Pic #2 is this high peripheral?
Pic #3 Is this low or high peripheral?
I have a large quantity of each 2 and 3 just wanna make sure they are graded correctly.
Thank you
Ross


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 Post subject: Re: Interesting IC
PostPosted: Fri Feb 03, 2023 11:52 pm 

Joined: Sat Nov 29, 2014 9:44 pm
Posts: 1138
Location: I'm right here :D
ICs like that are fairly common. What you see in the center is the die.

If I remember correctly, ICs can be reset by light (UV I believe) and normally have a sticker over the window to protect whatever has been programed onto the chip.

1) Long boards, at least low telco; I don't think it can go high but if you have a bunch might keep them separate but with your low telco in case they can be upgraded.
Square boards, make sure that silver box I can't read isn't mercury (doubtful, but always good to check), if no mercury, high telco.

2) High peripheral sounds right.

3) As is, I'm leaning low peripheral. Without the transformers probably could make high peripheral.

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My grades are my own opinion and not an official grade from Boardsort


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 Post subject: Re: Interesting IC
PostPosted: Sat Feb 04, 2023 12:53 am 

Joined: Mon Jan 09, 2023 10:08 pm
Posts: 18
Thank you. I greatly appreciate u taking the time to help me


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 Post subject: Re: Interesting IC
PostPosted: Sat Feb 18, 2023 11:24 am 

Joined: Fri Nov 11, 2022 1:15 pm
Posts: 3
So they are called EPROMS for Erasable Programmable Read Only Memory. And as marked141 said. you can erase them with UV light, then you put a sticker over the window so they aren't erased by ambient UV light, and you put it in a ROM programmer and put your data into it.
You can see the bonding wires going to the DIE. In some cases these are gold bonding wires. in your pic I think they are aluminum. These chips are usually socketed, so if you have something similar and there's a sticker on it it's worth scraping the sticker off and seeing if there's a window and if the bonding wires are gold.


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