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Of http://www.st.com/resource/en/datasheet/stm32f042k6.pdf WLCSP-36, 6x6 raster, 2.5x2.5mm package, pitch 0.4mm; see section 6.3 of http://www.st.com/resource/en/datasheet/stm32f103ze.pdf Lattice caBGA-381 footprint for the Adafruit Feather 32u4 RFM Footprint for Mini-Circuits case CK605 (https://ww2.minicircuits.com/case_style/CK605.pdf) following land pattern PL-035, including GND-vias (https://www.minicircuits.com/pcb/98-pl258.pdf Footprint for Mini-Circuits case TT1224 (https://ww2.minicircuits.com/case_style/TT1224.pdf) following land-pattern PL-258, including GND-vias (https://ww2.minicircuits.com/pcb/98-pl052.pdf Footprint for Mini-Circuits case HF1139 (https://ww2.minicircuits.com/case_style/HF1139.pdf Footprint for Mini-Circuits case QQQ130 (https://ww2.minicircuits.com/case_style/QQQ130.pdf) following land pattern PL-247, including GND-vias (https://ww2.minicircuits.com/pcb/98-pl035.pdf Footprint for Mini-Circuits case MMM168 (https://ww2.minicircuits.com/case_style/MMM168.pdf Footprint for Mini-Circuits case MMM168, Land pattern PL-225, vias.

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