{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MC68HC705C8AFU","brand":"NXP Semiconductors","brandSlug":"nxp","productSlug":"MC68HC705C8AFU","canonicalUrl":"https://icboms.com/nxp/MC68HC705C8AFU","factsUrl":"https://icboms.com/api/mcp/products/MC68HC705C8AFU","rawCanonicalId":null},"summary":{"shortDescription":"NXP / Freescale MC68HC705C8AFU, 8-bit OTP MCU, HC05 series, M68HC05 core, 2.1 MHz, 31 I/O, SCI/SPI, POR, WDT, 0°C to 70°C, PQFP64 through-hole.","salesMarkdown":"The MC68HC705C8AFU is an 8-bit microcontroller from the HC05 family, built around the M68HC05 core and clocked at 2.1 MHz. Its program memory is one-time programmable (OTP), which means the firmware is locked at the factory and cannot be updated in the field. This is a deliberate design choice for applications where the code is finalised before production and where field reprogramming introduces unacceptable risk or cost — think appliance controllers, remote sensors, or simple motor drives that ship with a fixed behaviour and never see a firmware update for their service life. ## 31 I/O with SCI and SPI — peripheral fit With 31 general-purpose I/O lines and on-chip SCI and SPI serial interfaces, this MCU can handle moderate pin-count control tasks and communicate with serial peripherals like EEPROMs, ADCs, or simple displays. On-chip POR (power-on reset) and WDT (watchdog timer) provide basic supervisory functions without an external reset supervisor. If your application lives inside a building with a controlled climate, this temperature grade is a good fit. For a legacy 8-bit OTP MCU that has been in the market for decades, this is a welcome signal for long-life designs or service-replacement contracts.","metaTitle":"MC68HC705C8AFU 8-bit OTP MCU, 2.1 MHz, M68HC05 core","metaDescription":"MC68HC705C8AFU 8-bit OTP MCU from the HC05 series with M68HC05 core at 2.1 MHz, 31 I/O, SCI/SPI, POR/WDT, commercial temp.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"series":"HC05","has_mpn":"MC68HC705","cpu_core":"M68HC05","frequency":"2.1 MHz","frame_size":"8-Bit","fuse_speed":"2.1 MHz","connectivity":"SCI, SPI","package_type":"Bulk","Number Of I/O":"31","mounting_type":"Through Hole","product_status":"Active","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","peripheral_types":"POR, WDT","supply_voltage_v":"3.0","Program Memory Type":"OTP","Operating Temperature High":"0°C to 70°C (TA)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$8.48","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/MC68HC705C8AFU/alternatives.json"},"ai":{"faq":[{"question":"Can MC68HC705C8AFU be soldered with a standard reflow process?","answer":"The part is listed with a through-hole mounting type, not surface-mount. It is intended for wave soldering or hand-soldering into plated through-holes, not reflow. Bulk packaging confirms it ships in tubes or trays, not tape-and-reel."},{"question":"What are the differences between MC68HC705C8AFU and MC68HC705P6A?","answer":"Both are 8-bit OTP MCUs from the HC05 family with the M68HC05 core. The C8 variant offers 31 I/O and SCI/SPI interfaces, while the P6A is a lower-pin-count device with fewer I/O and no SPI. The C8 runs at 2.1 MHz and comes in a 64-pin package; the P6A is typically in a 28-pin DIP or SOIC. The C8 is better suited for designs needing more I/O and serial communication."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/nxp/MC68HC705C8AFU","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/nxp/MC68HC705C8AFU 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}}