This was my first design using a lot of 0201 passives and this was my first use of an LGA. The LGA is a small one. Its a 0.62 mm X 0.62 mm N-Channel Mosfet by On-Semiconductor.
The Mosfet has three pads as you would expect. The drain is a big pad and the gate and source are small pads. Getting the footprint right is always important. It’s even more critical when you have asymmetric pads like this part. The part being so small only adds to it.
The end result of making that big pad too small is that there isn’t enough copper for the solder paste to spread evenly during reflow and most of the Mosfets ended up tilted a bit. Fortunately, the tilt isn’t enough to lift one of the small pads, but it might be when I make the production run of these boards. It’s possible that I might have a little bit more fall out requiring rework.
Eink, E-paper, Think Ink – Collin shares six segments pondering the unusual low-power display technology that somehow still seems a bit sci-fi – http://adafruit.com/thinkink
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.