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Below exposed pad; keepout area marked (Package see: https://store.invensense.com/datasheets/invensense/MPU9250REV1.0.pdf; See also https://www.invensense.com/wp-content/uploads/2015/02/InvenSense-MEMS-Handling.pdf 24-Lead Plastic QFN (3mm x 3mm) (see Linear Technology DFN_12_05-08-1723.pdf DFN, 12 Pin (https://www.renesas.com/us/en/document/psc/package-drawing-tdfn-12pin-l123x3c), generated with kicad-footprint-generator Soldered wire connection, for 4 times 1.5 mm² wires, reinforced insulation, conductor diameter 0.48mm, outer diameter 1mm, size source Multi-Contact FLEXI-E 1.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-133-02-xx-DV-PE-LC, 33 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py 64-Lead Plastic Thin Quad Flatpack (PT) - 12x12x1 mm Body, 2.00 mm Footprint [HTQFP] thermal pad with vias HTSSOP, 20 Pin (https://resurgentsemi.com/wp-content/uploads/2018/09/MPR121_rev5-Resurgent.pdf?d453f8&d453f8), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 36 Pin (http://www.issi.com/WW/pdf/61-64C5128AL.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 5 times 0.5 mm² wires, reinforced insulation, conductor diameter 1.7mm, outer diameter 2.7mm, size source Multi-Contact FLEXI-E 1.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55932-0410, with PCB locator, 13 Pins per row (http://www.molex.com/pdm_docs/sd/439151404_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-125-02-xxx-DV-LC, 25 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator Harwin Female Vertical Surface Mount (SMT), Audio Jack Connector (https://www.cuidevices.com/product/resource/sj2-359x-smt.pdf Korean Hroparts Elec PJ-320D-4A (https://datasheet.lcsc.com/lcsc/1810121716_Korean-Hroparts-Elec-PJ-320D-4A_C95562.pdf smt female jack horizontal A Series, 3 pole female XLR receptacle, grounding: without ground/shell contact, horizontal PCB mount, https://www.neutrik.com/en/product/nc3fbv2 AA Series, 3 pole female XLR receptacle, switching contacts, grounding: separate ground contact to mating connector shell and front panel, lateral right PCB mount, https://www.neutrik.com/en/product/ncj5fi-v-0 Combo I series, 3 pole female receptacle, grounding: separate ground contact connected to shell ground, but not to front panel to PSU PCB (will affect choice of 9 mm or 16 mm have been tested and there could be other values, ceramic may work.

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