# Mini PCIe [pinout at allpinouts.org](https://allpinouts.org/pinouts/connectors/buses/pci-express-card-and-pci-express-mini-card/) [pinout at pinoutguide.com](https://pinoutguide.com/Slots/mini_pcie_pinout.shtml) [random PDF (1.2, older revision) of the spec)](https://heap.ovh/files/mPCIe-electromechanical.pdf) Labels in Top side/Bottom side column are from spec. Spec labels mostly taken from pinoutguide.com for now, see there for * footnote meanings. "Common in devices" means these pins have been spotted in Helium miners/lorawan gateways. Zero of the observed mPCIe slots had -all- of the observed pins. | Common in devices | Spec label | Top side | Bottom side | Spec label | Common in devices | | ----------------- | ------------ | -------- | ----------- | ----------- | ----------------- | | | WAKE# | 1 | 2 | 3.3V | 3.3V | | | Reserved**** | 3 | 4 | GND | GND | | | Reserved**** | 5 | 6 | 1.5V | | | | CLKREQ# | 7 | 8 | VCC** | SIM_VCC | | GND | GND | 9 | 10 | I/O** | SIM_DATA | | | REFCLK- | 11 | 12 | CLK** | SIM_CLK | | | REFCLK+ | 13 | 14 | RST** | SIM_RST | | GND | N/C or GND | 15 | 16 | VPP** | | | | | key | key | | | | GND or NC | Reserved | 17 | 18 | GND | GND | | GPS_PPS | Reserved | 19 | 20 | Reserved*** | | | GND | GND | 21 | 22 | PERST# | RESET | | | PERn0 | 23 | 24 | +3.3Vaux | 3.3V | | | PERp0 | 25 | 26 | GND | GND | | GND | GND | 27 | 28 | +1.5V | | | GND | GND | 29 | 30 | SMB_CLK | I2C_SCL | | | PETn0 | 31 | 32 | SMB_DATA | I2C_SDA | | | PETp0 | 33 | 34 | GND | GND | | GND | GND | 35 | 36 | USB_D- | USB_D- | | GND | Reserved* | 37 | 38 | USB_D+ | USB_D+ | | 3.3V | Reserved* | 39 | 40 | GND | GND | | 3.3V | Reserved* | 41 | 42 | LED_WWAN# | | | GND | Reserved* | 43 | 44 | LED_WLAN# | | | SPI CLK | Reserved* | 45 | 46 | LED_WPAN# | | | SPI MISO | Reserved* | 47 | 48 | +1.5V | | | SPI MOSI | Reserved* | 49 | 50 | GND | GND | | SPI CE | Reserved* | 51 | 52 | +3.3V | 3.3V |