ESP32-C3-WROOM-02-H4

ESP32-C3-WROOM-02-H4 is the high-temperature ordering code of the Espressif ESP32-C3-WROOM-02 Wi-Fi and Bluetooth module: a single-core RISC-V ESP32-C3 at up to 160 MHz with 4 MB of in-package flash, 400 KB SRAM, 2.4 GHz Wi-Fi 4 (802.11b/g/n) and Bluetooth 5.0 LE with mesh, an on-board PCB antenna, and a compact 18 x 20 mm SMD footprint. The H4 code is rated for ambient temperatures from -40 °C to +105 °C, against -40 °C to +85 °C for the standard N4 code, with identical pinout, RF performance and firmware image. The selection point is thermal headroom at zero redesign cost: enclosed products whose internal ambient passes 85 °C — smart lighting, appliances mounted near heat sources, sealed outdoor enclosures in direct sun — can stay on the same qualified module footprint by changing only the ordering code. Selection advice: order the H4 when the worst-case ambient inside the enclosure can exceed 85 °C and stay with the N4 code (also listed) for ordinary indoor designs, since the two are drop-in equivalents; designs that need an external antenna should look at the WROOM-02U variants instead.