Ancestors

Toot

Written by jaseg on 2025-01-14 at 13:59

That's some expensive tape right there. This is anisotropic conductive film that cures under heat and pressure, resulting in a permanent bond. I think I'll pass and go for the cheaper (~100 USD/roll) stuff that works just like normal sticky tape and doesn't require heat, but requires larger pad size (~1x2mm vs. ~0.5x0.75mm IIRC).

For added fun, these ACF tapes have a shelf life that's only between six months and two years, and the heat-curing type even needs to be refrigerated.

[#]electronics

=> View attached media

=> More informations about this toot | More toots from jaseg@chaos.social

Descendants

Written by Cato, registered Lynx Ⓛ on 2025-01-14 at 14:01

@jaseg ah it's that thing that only conducts through the tape and not sideways basically right? :D

=> More informations about this toot | More toots from cato@chaosfurs.social

Written by jaseg on 2025-01-14 at 14:04

@cato Yeah, the way it works is really simple: It's just very thin double-sided tape that has little conductive spheres of a precisely-controlled diameter embedded (think 50µm). The amount of these spheres is well-controlled so you have them nicely spaced out throughout the tape, and they rarely touch. When you apply the tape, the spheres are harder than the glue, and they just get squished between the contacts to create a connection.

=> More informations about this toot | More toots from jaseg@chaos.social

Written by jaseg on 2025-01-14 at 14:05

@cato I want to use this stuff with some PCBs. AFAICT the main obstacle is that both contact areas have to be really flat, so ENIG is a must, and you have to remove soldermask around the whole contact area because soldermaks is too thick for the tolerancese this tape requires.

=> More informations about this toot | More toots from jaseg@chaos.social