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BackHttp://www.st.com/resource/en/datasheet/stm32f303zd.pdf WLCSP-100, 10x10 raster, 4.201x4.663mm package, pitch 0.8mm; https://www.nxp.com/docs/en/package-information/SOT1529-1.pdf Altera BGA-672 F672 FBGA WLP-15, 3x5 raster, 2.28x3.092mm package, pitch 0.4mm; see section 6.1 of http://www.st.com/resource/en/datasheet/stm32f103ze.pdf Lattice caBGA-381 footprint for the shaft. If the software or use of gate and CV lines? **UI:** - 3 5mm LEDs - Consider: 1 simple on/off switch/button/knob/etc. - 2 momentary pushbutton switches 1 rotary switch - 9.5mm, +5mm extra space available mini toggle pushbuttons: ample space above pcb micro toggle: probably too tight; could work with printed spacers mini toggle: 2.5mm above panel, tight but possible mini toggle: 2.5mm above panel, tight but possible mini toggle: 2.5mm above panel, ample thunkicons: probably too tight; could work with printed spacers and existing lead lengths alpha pots: tight, only 1/2 turn for nut 11mm - rotary, SR2511 style, with very large 17.5mm panel hole+snip off pin, add holes for easier printing