ATMEGA808-XF - 20MHz 8KB Flash AVR MCU 28-SSOP | Microchip
MPN: ATMEGA808-XF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.1 | $1.10 |
| 10 | $0.99 | $9.90 |
| 100 | $0.88 | $88.00 |
| 500 | $0.79 | $395.00 |
| 1,000 | $0.72 | $720.00 |
ATMEGA808-XF Overview
A microcontroller (MCU) is a single-chip computer that integrates a processor core, program memory (Flash), data memory (SRAM), non-volatile EEPROM, and peripherals such as timers, USARTs, and ADCs on one die. Microcontrollers sit at the lowest level of the embedded-computing hierarchy - below application processors and system-on-chip devices - and are the workhorses of industrial control, appliances, and IoT sensor nodes.
Key features of the ATMEGA808-XF include the latest AVR Core Independent Peripherals (CIPs), which allow peripherals such as timers and communication blocks to operate without CPU intervention; a hardware multiplier that accelerates math-heavy code; operation up to 20 MHz; and a memory configuration of 8 KB Flash, 1 KB SRAM, and 256 B EEPROM. The megaAVR 0-series architecture also brings modern peripherals and single-cycle I/O typical of the AVR family.
Technically, the megaAVR 0-series uses the enhanced 8-bit AVR RISC core with a two-stage pipeline, executing most instructions in a single clock cycle. The Core Independent Peripherals offload real-time tasks from software, improving determinism - a key reason the family carries Functional Safety documentation support. Peripheral Event System routing allows analog comparators, timers, and custom logic blocks to interconnect without CPU loading.
Typical applications include industrial automation nodes, home appliances, IoT sensor endpoints, motor-control辅助 logic, and general-purpose embedded control where a 5 V-tolerant, robust 8-bit MCU in a compact 28-SSOP footprint is preferred.
When designing with the ATMEGA808-XF, use the single-pin UPDI interface for programming and debugging to conserve board pins, and verify supply-range, peripheral count, and temperature-grade details against the official Microchip datasheet before finalizing the design.
This page synthesizes distributor availability, same-family drop-in alternatives (ATmega809/1608/3208/4808 in the same 28-SSOP XF package), and practical design guidance not consolidated in the manufacturer datasheet.
Drop-in alternatives for ATMEGA808-XF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATMEGA808-XF (same form factor and footprint) — differing in SRAM, Series, Core Processor, Flash Memory, EEPROM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA809-XF
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA1608-XFR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.66 / Unit
View Datasheet →ATMEGA3208-XF
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.19 / Unit
View Datasheet →ATMEGA4808-XF
✅ Drop-In ⚠️ 参数待验证✓ In Stock
Contact for price
View Datasheet →ATMEGA808-XF Maximum Ratings & Electrical Characteristics
| Core | 8-bit AVR |
| Core Architecture | megaAVR 0-series with hardware multiplier |
| Maximum Clock Frequency | 20 MHz |
| Flash Memory | 8 KB (8K x 8) |
| SRAM | 1 KB |
| EEPROM | 256 B |
| Package | 28-SSOP |
| Mounting Type | Surface Mount |
| Series | megaAVR 0, Functional Safety (FuSa) |
| Peripherals | Core Independent Peripherals (CIPs) |
| Programming Interface | UPDI (Unified Program and Debug Interface) |
| Pin Count | 28 |
ATMEGA808-XF 28-ssop Pin Configuration Guide
Pin configuration for ATMEGA808-XF (28-ssop package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATMEGA808-XF.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA808-XF is suitable for 6 applications: Industrial Automation Nodes, Home Appliances, IoT Sensor Endpoints, Motor Control Support Logic, Test and Measurement Accessories, Prototyping and Education with Arduino Ecosystem.
Industrial Automation Nodes
The ATMEGA808-XF fits industrial automation nodes because its megaAVR 0-series core runs deterministic single-cycle instructions at 20 MHz and its Core Independent Peripherals allow timers and communication blocks to service real-time tasks without CPU loading - a key requirement for sequenced machine control. With 8 KB Flash and 1 KB SRAM, it comfortably hosts Modbus-style UART protocols and state machines for relay, valve, and sensor-signal routing. In a typical node, the MCU polls digital inputs, drives outputs via timer-assisted PWM, and reports over RS-485 through a USART. Because Microchip markets the family with Functional Safety (FuSa) support, designers gain documentation resources that simplify reliability assessments in factory equipment.
Recommended
Home Appliances
Appliance control boards - washers, dishwashers, coffee machines - need a low-cost MCU that sequences loads, reads buttons, and handles user-interface timing. The ATMEGA808-XF's 8 KB Flash is typically sufficient for such state-machine code, while 256 B EEPROM stores calibration and user settings across power cycles without external NVM. The Core Independent Peripherals let hardware timers manage motor PWM and button debouncing autonomously, so the 20 MHz AVR core spends its cycles on application logic rather than bit-banging. The 28-SSOP package suits compact single-sided control PCBs, and the robust AVR I/O structure tolerates the noisy electromechanical environment typical of appliance designs, reducing external protection componentry.
Recommended
IoT Sensor Endpoints
For battery-conscious IoT sensor endpoints, the ATMEGA808-XF offers an efficient 8-bit AVR core whose peripheral set can capture sensor data with minimal CPU wake-ups via Core Independent Peripherals. The 8 KB Flash stores sensing firmware plus a compact protocol stack (UART-to-radio bridges are common), and 1 KB SRAM handles buffering and packet assembly. Programming and field updates run through the single-pin UPDI interface, freeing package pins for sensor I/O. Designers typically pair the MCU with a low-power radio module and sleep the core between samples, waking on timer or pin-change interrupts. Its 28-SSOP footprint keeps node PCBs small for enclosure-constrained sensor housings.
Recommended
Motor Control Support Logic
While dedicated motor-control MCUs handle complex FOC algorithms, the ATMEGA808-XF serves effectively as supervisory and support logic in motor-driven products: sequencing start/stop relays, generating PWM for simple DC or stepper drives, monitoring current via the analog peripherals, and shutting down on fault conditions. The hardware multiplier accelerates scaling math in speed calculations, and Core Independent timers keep PWM output glitch-free even while software handles communication. With 8 KB Flash, simple closed-loop fan or pump controllers fit entirely on-chip, and EEPROM retains fault logs and run-hour counters. The Functional Safety positioning of the megaAVR 0-series aids documentation for motor-safety interlock assessments.
Recommended
Test and Measurement Accessories
Bench accessories - dongle testers, calibration jigs, fixture controllers - benefit from the ATMEGA808-XF's predictable 20 MHz single-cycle core and abundant timers for precise pulse generation and measurement. The 8 KB Flash accommodates test-sequence scripting, while the USART bridges to a host PC or higher-level controller. Because megaAVR 0-series parts share one pinout across the 808 through 4808 Flash ladder, fixture designers can build one PCB and populate the memory size that matches each tester SKU, simplifying logistics. The single-pin UPDI interface also allows firmware updates in the field without exposing a full programming header, keeping fixtures sealed and ESD-protected.
Recommended
Prototyping and Education with Arduino Ecosystem
The ATMEGA808-XF is fully supported by the community MegaCoreX Arduino hardware package (ATmega4809/4808/3209/3208/1609/1608/809/808), which makes it an excellent low-cost target for prototyping and embedded-systems education. Students and makers can use familiar Arduino APIs while learning a modern AVR peripheral architecture - Event System, configurable custom logic, and UPDI single-wire programming. The 8 KB Flash is adequate for most teaching examples, and designs can later migrate to the pin-compatible ATMEGA4808-XF without board changes when projects outgrow the memory. The inexpensive 28-SSOP package also suits breadboard-adapter workflows and low-volume student PCB runs, keeping per-unit cost minimal for classroom budgets.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA808-XF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA809-XF | ATMEGA1608-XF | ATMEGA3208-XF | ATMEGA4808-XF |
|---|---|---|---|---|---|
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 8 KB | 16 KB | 16 KB | 32 KB | 48 KB |
| SRAM | 1 KB | 1 KB | 2 KB | 4 KB | 6 KB |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Core | 8-bit AVR (megaAVR 0-series) | 8-bit AVR (megaAVR 0-series) | 8-bit AVR (megaAVR 0-series) | 8-bit AVR (megaAVR 0-series) | 8-bit AVR (megaAVR 0-series) |
| Programming Interface | UPDI (single-pin) | UPDI (single-pin) | UPDI (single-pin) | UPDI (single-pin) | UPDI (single-pin) |
Key Differentiators
- Lowest-cost entry point of the 28-pin megaAVR 0-series (vs ATMEGA4808-XF)
- Identical footprint across the Flash ladder (vs ATMEGA1608-XF)
- Functional Safety (FuSa) positioning (vs ATMEGA48PA-AUR)
Design Notes
The ATMEGA808-XF programs and debugs over the single-pin UPDI interface; route this pin to a compact 1x3 header (UPDI, VDD, GND) rather than a full ISP header to conserve board space. Keep the UPDI trace short and away from high dv/dt nodes such as relay drivers, since a corrupted UPDI line can block production programming. Per Microchip's megaAVR 0-series design guidance, each VDD pin should have a 100 nF ceramic decoupling capacitor placed within a few millimeters of the pin, with a solid ground plane underneath the 28-SSOP footprint.
Confirm that your application fits within 8 KB Flash and 1 KB SRAM with margin before locking the bill of materials. Compiled C code with floating-point math and printf-style formatting can consume several kilobytes quickly; the AVR hardware multiplier helps math-heavy loops but does not eliminate library overhead. A common mistake is selecting the 808 and later needing a Flash upgrade - mitigate by designing the PCB around the shared 28-SSOP megaAVR 0-series footprint so the pin-compatible ATMEGA1608-XF/3208-XF/4808-XF can be substituted without respin.
Verify the operating supply voltage range and temperature grade from the official megaAVR 0-series datasheet before finalizing the power tree, as the verified web data retrieved for this page does not include the electrical limits for the XF suffix specifically. In 5 V industrial designs, add local bulk capacitance (at least 4.7 uF) alongside per-pin 100 nF decoupling, and protect inputs that connect to off-board wiring with series resistors and clamp diodes, since relay and solenoid environments commonly inject transients that exceed AVR absolute-maximum pin ratings.
Estimated: an 8-bit MCU running at 20 MHz with modest I/O loading typically dissipates only tens of milliwatts, so the 28-SSOP package needs no heatsink or thermal via array in standard designs. The main thermal consideration is trace current through output pins driving loads such as LEDs or transistor bases - keep continuous sink/source current per pin within datasheet limits (verify the exact mA rating in the electrical characteristics section) and provide adequate copper for shared ground return to avoid localized heating at the package leads.
Compliance Information
Compliance status not explicitly stated in the retrieved web data; verify on Microchip's official product page or distributor environmental datasheets.
