{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ESP32-MINI-1U-H4","brand":"Espressif Systems","brandSlug":"espressif","productSlug":"ESP32-MINI-1U-H4","canonicalUrl":"https://icboms.com/espressif/ESP32-MINI-1U-H4","factsUrl":"https://icboms.com/api/mcp/products/ESP32-MINI-1U-H4","rawCanonicalId":null},"summary":{"shortDescription":"Espressif Systems ESP32 series, ESP32-MINI-1U-H4 RF & Wireless IC, 2.4 GHz 802.11b/g/n + Bluetooth v4.2, 4 MB Flash, 536 kB SRAM, 55-SMD Module, -40°C to +105°C.","salesMarkdown":"## 4 MB flash, 536 KB SRAM — the memory budget for a connected edge node The ESP32-MINI-1U-H4 carries 4 MB of embedded flash, 448 kB of ROM, and 536 kB of SRAM on the ESP32-U4WDH die. For a typical IoT application running an RTOS with a WiFi stack and TLS, the SRAM leaves roughly 200–250 kB free for the application heap after the protocol buffers and the Bluetooth controller are allocated — enough for a JSON parser and a modest sensor buffer without external PSRAM. The 4 MB flash is the same footprint used by Espressif's ESP-IDF OTA example — a full application image plus a fallback partition fits within 2 MB, leaving the other half for a second-stage bootloader and a small file system. If your firmware image exceeds 3 MB, you will need to compress the partition table or move to a module with external flash. ## Dual-protocol radio: 802.11b/g/n at 150 Mbps plus Bluetooth v4.2 The radio covers 2.4 GHz WiFi at a data rate of 150 Mbps and Bluetooth v4.2 with EDR, supporting Class 1, 2, and 3 transmit power levels. The 19.5 dBm max output power means the module can push a usable signal through two interior walls in a residential setting — the link budget at -97 dBm sensitivity gives roughly 116 dB of path loss margin at 1 Mbps, which translates to about 50–60 meters line-of-sight with the on-board trace antenna (antenna not included in this variant; the U.FL connector expects an external antenna). Modulation includes 8DPSK and DQPSK for Bluetooth, and the standard OFDM/CCK for WiFi. The module handles concurrent WiFi and Bluetooth operation via a shared antenna port — the coexistence algorithm in the ESP32 firmware arbitrates the RF front-end, so a BLE beacon scan does not drop the WiFi association as long as the beacon interval is above 100 ms. ## Active production — no last-time-buy window to manage For a BOM that requires a second-source hedge, the ESP32-MINI-1U-H4 shares the same footprint and pinout as the ESP32-MINI-1U (non-H4 variant) — the difference is the flash die inside. The H4 suffix indicates a specific flash vendor and temperature grade; swapping to the base variant requires firmware re-validation of the flash timing parameters but no board spin. The 105°C ceiling puts it in the industrial-plus band — suitable for outdoor enclosures, engine-bay-adjacent telematics, or a sealed IoT gateway that sees solar loading. At 105°C the internal regulator's dropout margin shrinks; the 3 V minimum supply must be held within ±2% at the module pin, not at the board input. Current consumption during receive is 112–118 mA; during transmit it ranges from 260 mA to 379 mA depending on the output power setting and the protocol in use. A 3.3 V rail feeding the module should be rated for at least 500 mA to cover the peak transmit current plus the inrush from the on-chip buck converter's startup sequence. ## 55-SMD module — reflow profile and antenna routing The package is a 55-SMD module, surface-mount, with a castellated edge for the RF and I/O pads. The land pattern is a standard 0.8 mm pitch; the module's own PCB substrate has a ground plane underneath the ESP32 die, so the board-level ground pour should extend at least 3 mm beyond the module footprint to maintain the RF reference plane. The U.FL connector sits on the module edge — keep the 50-ohm trace from the connector to the antenna feed point as short as possible, ideally under 10 mm, to minimise insertion loss.","metaTitle":"Espressif ESP32-MINI-1U-H4, 2.4 GHz WiFi/BT Module","metaDescription":"ESP32-MINI-1U-H4 module: 2.4 GHz 802.11b/g/n + BT v4.2, 4 MB flash, 536 KB SRAM, -40 to +105°C. Active production. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["RF & Wireless ICs"],"specifications":{"Mfr":"Espressif Systems","Series":"ESP32","Package":"Tape & Reel (TR) Cut Tape (CT)","Protocol":"802.11b/g/n, Bluetooth v4.2 +EDR, Class 1, 2 and 3","Data Rate":"150Mbps","Frequency":"2.4GHz","Modulation":"8DPSK, DQPSK","Memory Size":"4MB Flash, 448kB ROM, 536kB SRAM","Sensitivity":"-97dBm","Antenna Type":"Antenna Not Included, U.FL","Mounting Type":"Surface Mount","Package / Case":"55-SMD Module","Power - Output":"19.5dBm","Product Status":"Active","lifecycle_stage":"eol_hot","Voltage - Supply":"3V ~ 3.6V","Serial Interfaces":"ADC, GPIO, I²C, I²S, SDIO, SPI, PWM, UART","RF Family/Standard":"Bluetooth, WiFi","Utilized IC / Part":"ESP32-U4WDH","Base Product Number":"ESP32","Current - Receiving":"112mA ~ 118mA","Operating Temperature":"-40°C ~ 105°C (TA)","Current - Transmitting":"260mA ~ 379mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.3800","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/a186d96780983a433664f9f67b8113f8.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/ESP32-MINI-1U-H4/alternatives.json"},"ai":{"faq":[{"question":"What serial interfaces does the ESP32-MINI-1U-H4 support?","answer":"The module brings out ADC, GPIO, I²C, I²S, SDIO, SPI, PWM, and UART interfaces from the ESP32-U4WDH die. The pin mapping is the same as the standard ESP32-MINI-1U footprint — the SDIO interface runs at 4-bit width and supports external flash or SRAM over the SPI bus."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/espressif/ESP32-MINI-1U-H4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/espressif/ESP32-MINI-1U-H4 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}