A bag full of chips! (PWJ229)
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- เผยแพร่เมื่อ 14 เม.ย. 2024
- From our collection at work, there was a box full of chip manufacturing stuff and I thought that's something for an interesting video.
We have 74LS04 TDA2030C and some unknown chips. If YOU know what they are, please write it in the comments... - วิทยาศาสตร์และเทคโนโลยี
the lead frames that are intended for ceramic packages might need thermal expansion coefficient matching, they could be made from a Fe-Ni-Co alloy like kovar
That is also possible... I think I will have to use some sandpaper to find out if it's solid or plated.
I like the Art Deco vibe.
Yeah, these things have a kind of unique aestethics ... 🙂
I e been wanting to set nice looking chips into a ring or earrings. They really are beautiful in the sun.
Very interesting! I remember them "bonding girls" at Siemens wiring up chips with gold wires back in 1976. Later Sony mass produced ccd chips and someone turned up the bonding speed and the result was some millions of chips where the wires were falling off. I still have heaps of such chips but they are of course so old for interlaced scanning that is no longer a topic. Nowadays we carry 2nm chips in our pocket and and worry about deleting messages...
Yeah true! What a problem if the emoji has the wron color...
It is interesting that in the early computer years, it was alway the women who had to handle the delicate wire work. Apollo rope-memory, CRAY backplanes and even the assembly of radio tubes.
@@PlaywithJunk Some women painted watch faces duped to be the uranium girls. But the tide had changed, Linda Ham insisted on some beauty insulation for no scientific reason and on the start that was the reason to bring the 2nd shuttle accident. The first accident was of course the ignorance of the rubber specification.
@@LawpickingLocksmith You mean the Radium girls....
Never heard of Linda Ham before but it seems to be an interesting story... there is much to read about her.
It's always a problem when management decisions are taken more seriously than engineering. You can save a few dollars in the beginning but you will end up in a desaster that costs you millions. (Like the CNA Plaza Chicago accident in 1999, interesting story)
I think these were all put on the wrong frames by error. A TDA2030 with only 3 pins, a 74LS04 with 20 pins. Does not match. So they had to get rid of them.
Maybe some practise material... or they cut away one pair of pins on each side... hmm that's still 16 but we need 14... well cut two more off. 🙂
Or a sample run of some kind to test an assembly machine. I've also seen space grade PCBs at a trade show that were populated with plastic 74HC logic that made no sense at all - a quad NAND, an HC123 monostable, and one more simple chip were all that was there - just dmmies to fill the space.
I don't think it has been done by error. But some of the chips look a bit "blurred". Traces and letters are not as crisp as usual. So it may be possible that this was just a calibration run or an apprentices job 🙂
@@PlaywithJunk Of course, totally possible. We wil never find out why they were made like that.
Really cool find
Cool chips
The 74LS04's are odd. 74LS04 is a 14 pin IC, but yours are on 20 pin lead frames. I guess they just throw away some of the outer pins.
Saves the effort of needing to decap them. ;)
Always fun to see a chip with it's pant's down. We used to get chips in as die's and wire bond then ourselves. Only ever got to see the process on samples as when the real chips were being bonded the area was cleaned and turned back in to a clean room.
Interesting... I just wonder how those bonding wires are actually attached to the chip? Is it only pressure or some ultrasonic?
@@PlaywithJunk it looked more like a spot welder. just the machine just touch's the wire to the pad and joint is done.
@@TheEmbeddedHobbyist But a spot welder would need a second electrode. You can't run the welding current through the chip...
I have seen many microscope videos about placing those bond wires but it was never explained how they attach them. Maybe it's just pressure as gold is very soft.
@@TheEmbeddedHobbyist Or we just read this Wikipedia article: en.wikipedia.org/wiki/Wire_bonding
(with video)
@@PlaywithJunk Now we know, watching them practice they just seemed to program where the two ends were going to be. And it went and just placed the wire, they had a microscope I was just looking over their shoulders. My job was working on the design of the chip doing all the signal processing of the voltages coming off the sensor. I didn't get in to the device assembly area that much, only when they were making changes inside the clean room. So it had lost it clean room status.
I would love some of that to put on the wall. Looks like Egyptian art or something.
Feel free to copy the pattern of whatever you like. 🙂
@@PlaywithJunk Thanks. I sent you email. Happy to pay. Tried to find some on internet to buy but not sure my terminology right I searched for integrated circuits frame.
10:31 The Eprom is something like a 2716 with 16Kbit of memory.
per side 8 colums wit 16 bits and 64 rows =8 Kbit x 2
Tanks for this content
I would love to find some of these in a closet at my work 😉 Interesting that the pin count does not match the ic's.
Those metal thingies are called "Leadframes"
Yes thank you. I should have known that 🙂 But sometimes the right word just hides behind the brain.
Amazing 🤗
Interesting what you have around at your company. Did somebody pay from 1980 to now to keep these things?
No 🙂 This was in a closet of a long-term colleague. He was a teacher for the apprentices and somehow he got these parts and kept them all the time. Now he moved to a new office room and the closed had to be cleaned up...
No início do vídeo parecia o Josiah Trelawny falando
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