タグ: 3D SPI

Straight Talk from the Line: Why I’m Dead-Set on 3D SPI for Fine-Pitch, and 2D Just Doesn’t Cut It

A couple days ago something happened on the line, and it really stung. A batch of 0.4mm QFP boards looked fine to the naked eye right off the printer, but two hours later every single one failed functional test. We cracked open the parts and looked — man, the leads just never got any solder on them. Under the microscope it was obvious: the root was the very first process — the paste on the pad was already 20% short, and before reflow there just wasn’t enough material, so no way it was going to solder right after that. That’s why now I’ll go to bat with the boss to […]