The WL1801MODGBMOCR is a WiFi 802.11b/g/n and Bluetooth 4.1 combo module from Texas Instruments, based on the WiLink 8 (WL1801) chipset. The module integrates the WiFi transceiver, Bluetooth transceiver, power amplifier (PA), low-noise amplifier (LNA), RF switches, power management, and crystal oscillator in a 13.5×13.5×2.0mm LGA package. The host MCU communicates via SDIO for WiFi data and UART (HCI) for Bluetooth data, with separate enable pins (WL_EN for WiFi, BT_EN for Bluetooth) and a WiFi interrupt pin (WL_IRQ). The WiFi supports 802.11b/g/n in the 2.4GHz band with up to 72.2Mbps PHY rate (single spatial stream, 40MHz channel, short GI). The Bluetooth supports Classic (BR/EDR) and Low Energy (BLE) simultaneously via a shared antenna with time-division multiplexing. The module requires an external antenna connected to the RF_IN pin (typically via a U.FL connector or PCB trace antenna). The coexistence mechanism between WiFi and BT is handled internally by the WL1801 chipset, which time-multiplexes the antenna access and provides packet traffic arbitration (PTA) signals. The module operates from a single 1.8V or 3.3V supply (configurable via VDDIO). The MOCR suffix specifies the industrial temperature version (-40C to +85C) with module certification (FCC, CE, IC). The module is pre-certified for regulatory compliance, saving significant certification cost and time.