PCI express Mini map (also known as Mini PCI Express, Mini PCIe, and Mini PCI-E) is a replacement for the Mini PCI kind factor based upon PCI Express. The is emerged by the PCI-SIG. The host maker supports both PCI Express and also USB 2.0 connectivity, and each card uses whichever the designer feel most suitable to the task. Most laptop computers constructed after 2005 are based upon PCI Express and can have several Mini card slots.
| Top side | Bottom side | ||
| 1 | WAKE# | 2 | 3.3V |
| 3 | Reserved**** | 4 | GND |
| 5 | Reserved**** | 6 | 1.5V |
| 7 | CLKREQ# | 8 | VCC** |
| 9 | GND | 10 | I/O** |
| 11 | REFCLK- | 12 | CLK** |
| 13 | REFCLK+ | 14 | RST** |
| 15 | N/C or GND | 16 | VPP** |
| Mechanical key | |||
| 17 | Reserved | 18 | GND |
| 19 | Reserved | 20 | Reserved*** |
| 21 | GND | 22 | PERST# |
| 23 | PERn0 | 24 | +3.3Vaux |
| 25 | PERp0 | 26 | GND |
| 27 | GND | 28 | +1.5V |
| 29 | GND | 30 | SMB_CLK |
| 31 | PETn0 | 32 | SMB_DATA |
| 33 | PETp0 | 34 | GND |
| 35 | GND | 36 | USB_D- |
| 37 | Reserved* | 38 | USB_D+ |
| 39 | Reserved* | 40 | GND |
| 41 | Reserved* | 42 | LED_WWAN# |
| 43 | Reserved* | 44 | LED_WLAN# |
| 45 | Reserved* | 46 | LED_WPAN# |
| 47 | Reserved* | 48 | +1.5V |
| 49 | Reserved* | 50 | GND |
| 51 | Reserved* | 52 | +3.3V |
*Reserved for future second PCI Express lane (if needed).Pin 51 has changed to it is in W_DISABLE2#**Reserved for future Subscriber identity Module (SIM) user interface (if needed)***Reserved for future wireless disable signal (if needed)****Reserved for future wireless coexistence control interface (if needed)