Esp-Wroom-02D/Esp-Wroom-02U - Espressif Systems ESP8266 Series Hardware Design Manuallines

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For details of ESP-WROOM-S2, please refer to

3.3. ESP-WROOM-02D/ESP-WROOM-02U

The module size of ESP-WROOM-02D is (18±0.2) mm x (20±0.2) mm x (3±0.15) mm. The
type of flash used on this module is an SPI flash with a package size of SOP 8-150 mil. The
gain of the on-board PCB antenna is 3 dBi.
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The module size of ESP-WROOM-02U is (18±0.1) x (14.3±0.1) x (3.2±0.1) mm. The type of
flash used on this module is an SPI flash with a package size of SOP 8-150 mil. ESP-
WROOM-02U integrates a U.FL connector and has no onboard antenna.
Espressif
Figure 3-2. ESP-WROOM-02 Module
ESP-WROOM-02
Figure 3-3. ESP-WROOM-02D Module
28 " /30
3. ESP8266EX Module
Datasheet.
2018.12