STM32F767 Development Board Upgrade

The board to design is really simple and straightforward.  I'm going to put down a footprint for the MT25QL512ABB and an 0805 capacitor.  The bottom will have the 2x4 1.27mm SMD female socket.  Also by adding some 1x4 1.27mm pin header on each side this guy could double as a tiny general purpose MT25QL breakout.  The WPDFN-8 footprint is not included in the KiCAD library, but I already one that I had made from a project past.  SnapEDA has one, but I've not tested it, so YMMV.  All in all it's an incredibly easy board to lay out the only thing worth mentioning is that since the WPDFN-8 has a large EP pad on the bottom, I added a large via to that pad that will allow me to flow some solder under there to ensure a good thermal and electrical connection.  The board is tiny and even with OSHPark's Super Swift service, it only costs 3.20USD delivered!  Here's what the render of the board looks like:

The Samtech female connector will be much shorter than pictured here.

Here's the BOM

U1 - MT25QL512ABB Digikey 557-1786-ND

C1 - 0805 0.1uF 16V X7R (any will do) (not strictly necessary)

J2 (bottom connector) - Digikey SAM13109CT-ND

J1, J3 (top pin header) - Digikey 952-3600-ND (not necessary)

Mating connector for J2 - Digikey SAM13898CT-ND

Here's the board file on OSHPark:

Order from OSH Park

Next up, build it when everything comes in!

The first step is to remove the existing W25Q128 flash device and replace it with some pin header to connect up a custom board.  The 1.27mm pitch SOIC-8 package is pretty easy to remove.  First start by cutting each of the eight pins with a pair of sharp flush cutters.  Then fire up the soldering iron and bits left over by heating them up and swiping them off.  Careful not to heat up the pads to much because you can lift them if you're not careful.  I selected the Samtech FTS header because the width of it matched what I expected the distance to be between the 2 rows of pads for the SOIC8.  The Samtech FTS-104-03-F-DV-TR can be found on Digikey (P/N SAM13898CT-ND).  After removing the leftovers of the flash chip, clean off the pads with some solder wick and tin one of the corner pads.  Line up the connector and tack it down onto that tinned pad.  Tack down the opposite corner and if everything lines up solder the remaining pins.  When you're done you should have something like this:

Next step is design and build a board to mount there