{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ATTINY44-20MU","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"ATTINY44-20MU","canonicalUrl":"https://icboms.com/microchip/ATTINY44-20MU","factsUrl":"https://icboms.com/api/mcp/products/ATTINY44-20MU","rawCanonicalId":null},"summary":{"shortDescription":"Microchip AVR® ATtiny 8-bit MCU, ATTINY44-20MU, 20MHz AVR core, 4KB Flash, 256 x 8 SRAM, 256 x 8 EEPROM, 12 I/O, 8x10b ADC, USI, -40°C to 85°C, 20-WFQFN Exposed Pad.","salesMarkdown":"## 20 MHz AVR core in a 4 KB Flash envelope The ATTINY44-20MU is an 8-bit AVR microcontroller from Microchip's ATtiny series, clocked at 20 MHz with 4 KB of on-chip Flash program memory and 256 bytes each of SRAM and EEPROM. The 20 MHz ceiling sets the instruction throughput — most single-cycle AVR instructions execute in 50 ns — which matters for PWM update rates and USI bit-bang timing loops. ## 4 KB Flash — what fits and what does not 4 KB of program memory (2K x 16) is the hard firmware budget. A typical application — reading two analog sensors over the ADC, driving a PWM output, and communicating via the USI as an I²C slave — leaves roughly 1–1.5 KB free after the core loop and peripheral init. If the firmware needs a full USB stack, a bootloader, or complex state machines, the 4 KB ceiling forces a jump to the ATtiny24 or ATtiny84 (same pinout, 8 KB / 16 KB Flash respectively). The brown-out detection and POR peripherals ensure a clean reset on power-up and during supply dips. The 12 I/O pins break out to the peripheral ring; the centre pad is the ground return for the core and I/O. Surface-mount reflow per J-STD-020 is standard; the MSL rating (not in evidence) should be confirmed from the Microchip package drawing before stencil design.","metaTitle":"ATTINY44-20MU AVR 8-bit MCU, 4KB Flash, 20MHz, 20-QFN","metaDescription":"Microchip ATTINY44-20MU 8-bit AVR MCU, 20MHz, 4KB Flash, 256B SRAM, 12 I/O, 8x10b ADC, -40 to 85°C.","metaKeywords":null},"attributes":{"series":"AVR® ATtiny","packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Speed":"20MHz","Series":"AVR® ATtiny","Package":"Bulk","RAM Size":"256 x 8","Core Size":"8-Bit","EEPROM Size":"256 x 8","Peripherals":"Brown-out Detect/Reset, POR, PWM, WDT","Connectivity":"USI","Mounting Type":"Surface Mount","Number of I/O":"12","Core Processor":"AVR","Package / Case":"20-WFQFN Exposed Pad","Data Converters":"A/D 8x10b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Program Memory Size":"4KB (2K x 16)","Program Memory Type":"FLASH","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"20-QFN-EP (4x4)","Voltage - Supply (Vcc/Vdd)":"2.7V ~ 5.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.88","priceTiers":[{"qty":160,"price":"$1.88000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/3c086614eb834c31bb85898f5d29ddb6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/ATTINY44-20MU/alternatives.json"},"ai":{"faq":[{"question":"Does the ATTINY44-20MU work with 3.3 V logic?","answer":"At 3.3 V the 20 MHz clock is still within spec, and the I/O pins are 5 V-tolerant for interfacing with legacy 5 V peripherals. The internal oscillator runs at 20 MHz across the full supply range without an external crystal."},{"question":"What programming tools work with the ATTINY44-20MU?","answer":"The ATTINY44-20MU uses the standard AVR ISP (In-System Programming) interface via the SPI pins (MOSI, MISO, SCK, RESET). Tools like the USBTinyISP, Atmel-ICE, or Microchip's PICkit 4 can program it."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/ATTINY44-20MU","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/ATTINY44-20MU when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T14:34:45.345Z","lastPublished":"2026-07-20T14:34:45.345Z","indexable":true}}