The ESP32-D2WD is a dual-core Wi-Fi and Bluetooth 4.2 combo MCU from Espressif Systems, integrating a 2.4 GHz radio with a 32-bit processor in a single 48-QFN (5x5 mm) package. It carries 16 Mb of embedded flash, 448 kB ROM, and 520 kB SRAM — enough for a full TCP/IP stack and a moderate application image without external memory. With 34 GPIOs and serial interfaces including I²C, I²S, SPI, and UART, it connects to sensors, displays, and actuators typical in IoT edge nodes, smart home controllers, and industrial wireless bridges.
Memory and radio parametrics that matter for BOM fit
The 16 Mb flash (2 MB) is shared between program storage and OTA update staging — budget ~1.2 MB for the firmware image if you plan a dual-slot OTA scheme. The 520 kB SRAM is split between instruction and data caches; a typical FreeRTOS + LwIP application leaves 80–100 kB free for heap after the kernel and Wi-Fi stack. Transmit power is rated at 20 dBm with a receive sensitivity of -98 dBm for 802.11b, giving a link budget that reaches through two interior walls in a residential setting. Current draw is 240 mA during transmit and 100 mA during receive — factor this into the 2.3 V to 3.6 V supply rail design and the regulator's thermal budget.
Espressif has marked the ESP32-D2WD as Obsolete. No further production runs are planned. If your BOM still calls out this order code, you are on a last-time-buy window or already past it — every unit sourced from here is pulled from remaining distributor inventory, not fresh fab output. The base product number is ESP32-D2; the 'WD' suffix indicates the die variant with embedded flash. No official successor part number is listed in the available lifecycle records, so a pin-compatible drop-in replacement is not guaranteed. Sourcing is per RFQ against the quantity you need — confirm availability and pricing at quote time.