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LOCTITE® ABLESTIK ACP 3122 is an anisotropic epoxy adhesive designed for high throughput microelectronics assembly applications. This adhesive conducts in only one direction, making it suitable for small die and component attachment without the possibility of electrical shorting. ACP-3122 requires pressure during cure to establish a reliable interconnect.
Even though it is listed as an Underfill, LOCTITE® ABLESTIK ACP 3122 can also be used to bond a die, facilitate electrical connections under the bumps and (finally, as an underfill) destress the area around the bumps. So it goes without saying that it is a multi purpose product. Anisotropic pastes & films work well over a limited operating temperature range. If you are looking to operate outside of the range of -40°C/+125°C (or maybe even -40°C/+ 90°C) then there could be some issues with reliability that need to be tested.