Search found 82 matches

by siliconGary
Wed Apr 18, 2018 8:14 pm
Forum: Equipment Discussions
Topic: Ultrasonic Cleaner
Replies: 5
Views: 1462

Also forgot to add - specific heating function is not really useful IMO. I find cleaning die for ~3 mins is sufficient, no benefit to running longer. It is not difficult to externally warm bath water.
A good nozzle for an air compressor to blow dry the die is worthwhile.
by siliconGary
Wed Apr 18, 2018 8:08 pm
Forum: Equipment Discussions
Topic: Ultrasonic Cleaner
Replies: 5
Views: 1462

I clean die in a small beaker of acetone sitting in a warm water bath in the ultrasonic cleaner. I think any of the cheap ultrasonic jewelry cleaners will work well. (Make sure you buy one for the correct voltage - my first one I bought on eBay was set for UK voltage, and was not adaptable).
by siliconGary
Tue Feb 20, 2018 7:25 am
Forum: Photography Through the Microscope
Topic: AMI Wafer
Replies: 12
Views: 1620

Nice images! BTW that is not an AMD wafer, your wafer was made by AMI semiconductors. They were bought by ONSemi and they have a wafer fab in Nampa Idaho (Outside of Boise) that is still operational. Which is presumably where yours originally came from (Given the Idaho artwork). Coincidentally the w...
by siliconGary
Wed Feb 07, 2018 3:50 pm
Forum: Photography Through the Microscope
Topic: LCD Display
Replies: 2
Views: 687

LCD Display

This is an LCD display from a portable DVD player (Just the LCD layer after the backplane was removed). I thought it was interesting looking at it with different illumination. First with transmitted light (unusual for me I normally use microscope in metallurgical mode) http://www.photomacrography.ne...
by siliconGary
Wed Feb 07, 2018 8:04 am
Forum: Photography Through the Microscope
Topic: SONY CXA 1579P
Replies: 5
Views: 803

Just large value resistors. In an chip you only have a few layers to work with that you can use to make resistors. Each layer has a specific sheet resistance (Depends on the layer material and doping level) expressed in ohms/square. The value of a resistor is sheet resistance * # of squares or sheet...
by siliconGary
Tue Feb 06, 2018 4:55 pm
Forum: Photography Through the Microscope
Topic: SONY CXA 1579P
Replies: 5
Views: 803

The (Aluminum) metal tracks have been etched out during the decap. You can see the silicon residues that have precipitated out of the Aluminum tracks (The Aluminum typically contains ~1% silicon to improve electromigration.) This doesn't normally happen as the metal is covered with a dielectric pass...
by siliconGary
Sun Feb 04, 2018 7:17 pm
Forum: Equipment Discussions
Topic: Regrinding badly scratched front lens of M plan 20x ELWD?
Replies: 22
Views: 4570

That lens of mine almost looks like some vapours have attacked it. Are there any chemicals known to cause that? Methylene chloride? Maybe a specimen had been etched with hydrogen fluoride and they forgot to wash it all off :D? A bit off topic but back in the 80's I worked in a chip wafer fab in the...
by siliconGary
Fri Jan 12, 2018 1:21 pm
Forum: Photography Through the Microscope
Topic: Graphics from a TCEC ST7CD1SH
Replies: 2
Views: 539

Nice piece from the lost world of silicon art. It is becoming much rarer to find these 'easter eggs' in modern chips, they seem to have died down from the 90's to today where they are very rare. From a processing point of view it is funny how the CD is very precise circles but the 'pick-up arm' is c...
by siliconGary
Tue Dec 26, 2017 3:10 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: InP Test Chip
Replies: 11
Views: 1597

As a old process guy I will admit that I used to be a bit jealous of you cool designers getting to put your initials onto the chips :D (Even though probably only a few dozen people ever saw them normally.) I think high frequency chips alway look interesting, the symmetry and precise layout is so tid...
by siliconGary
Tue Dec 26, 2017 7:35 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: InP Test Chip
Replies: 11
Views: 1597

That's a great image! The thick top metal layer gold? (Or is it Cu) layer on the surface really jumps out. Do I see your initials in the bottom right corner of the chip? :-)
by siliconGary
Sat Nov 25, 2017 11:00 am
Forum: Equipment Discussions
Topic: What to look for in a stereo microscope?
Replies: 14
Views: 2007

Thanks for the feedback, and for your generous offer Ray. I think for my needs I probably want a good working system with reasonable lighting and zoom, without vibration issues, but not necessarily the best or top quality optics possible. With the cost of shipping to Canada (+ duty taxes) and the ri...
by siliconGary
Fri Nov 24, 2017 8:29 am
Forum: Equipment Discussions
Topic: What to look for in a stereo microscope?
Replies: 14
Views: 2007

What to look for in a stereo microscope?

I am considering getting a stereo microscope. At first glance the choice seems a bit overwhelming, so I am seeking advice from the experts here on what is important for a stereo microscope. I want it primarily to aid in plucking bond wires ~25 um diameter gold wire attached to silicon chips using tw...
by siliconGary
Fri Nov 24, 2017 8:29 am
Forum: Equipment Discussions
Topic: What to look for in a stereo microscope?
Replies: 0
Views: 367

What to look for in a stereo microscope?

I am considering getting a stereo microscope. At first glance the choice seems a bit overwhelming, so I am seeking advice from the experts here on what is important for a stereo microscope. I want it primarily to aid in plucking bond wires ~25 ?m diameter gold wire attached to silicon chips using tw...
by siliconGary
Wed Jun 21, 2017 3:20 pm
Forum: Photography Through the Microscope
Topic: CPU compnent
Replies: 2
Views: 498

They're not metal plates, that is the silicon die you are looking at! In a modern CPU the die has hundreds of solder ball connections down to a small PCB (Which has 6-10 layers of interconnect) and has the package solder balls on one side (And the die on the other). In your image you can see the top...
by siliconGary
Sat May 27, 2017 6:35 pm
Forum: Equipment Discussions
Topic: new telecentric lenses at Edmund Optics
Replies: 4
Views: 2219

So who would the customers be for this type of lens and what sort of things would they photograph with it?