I had to layout a 28-pin SSOP package in EasyPC (a PCB design package) at work today so that I could include it in a PCB for a new instrument we’re designing. To check the layout was correct I printed it out to offer it up against the chip.
Amazed at the teeny tinyness of the thing, I had a shot at taking photographs of it down the microscope in my lunch break. You can see the dots of the printer where the pads will be next to the pins.
(More after the break)
The IC in question is a MAX1402 A2D convertor, this package has a pin spacing of 0.65mm! No wonder you can see the dots from the laser printer next to the pins when magnified enough to get a look at the pins. Looking at the above picture our microscope could do with a clean.
I also managed to get quite a nice shot of the chip as a whole through the microscope, zoomed out as far as it would go and then cropped to remove the black surround.
And here’s a shot without the microscope with a steel rule to give an idea of scale.