ATMEGA808-XU - 8-Bit AVR MCU 20MHz 8KB Flash | Microchip
MPN: ATMEGA808-XU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.05 | $1.05 |
| 10 | $0.94 | $9.40 |
| 100 | $0.82 | $82.00 |
| 500 | $0.74 | $370.00 |
| 1,000 | $0.68 | $680.00 |
ATMEGA808-XU Overview
A microcontroller (MCU) integrates a processor core, non-volatile program memory, RAM, and peripherals onto a single chip, sitting at the top of the hierarchy that runs from discrete transistors through logic ICs to full system-on-chip devices. The megaAVR 0-series is Microchip's modernized AVR family using the latest Core Independent Peripherals, enabling low-power operation without CPU intervention.
Key features include the AVR RISC core with hardware multiplier executing most instructions in a single cycle, up to 20 MHz operation, 8 KB of self-programmable Flash, and functional-safety (FuSa) support documented by Microchip. Peripherals include Core Independent Peripherals (CIPs) such as configurable timers, USART, and analog comparators that operate without CPU overhead, reducing firmware complexity and interrupt latency.
The 0-series architecture uses a unified address space and single-cycle I/O access. The hardware multiplier accelerates math-intensive loops common in motor control and metering firmware. Multiple sleep modes and peripheral clock gating allow very low average power in battery-operated nodes; the event system routes peripheral signals directly to other peripherals without CPU involvement.
Typical applications include industrial control and sensing nodes, home appliances, consumer electronics, and functional-safety-oriented designs that benefit from Microchip's FuSa documentation package. The 28-SSOP package fits compact 2-layer PCBs where hand or wave soldering of fine-pitch QFN is undesirable.
Designers should verify the exact temperature grade: the -XU suffix indicates the -40C to +125C industrial range, while -XF variants cover -40C to +105C; both share the same SSOP-28 footprint. Supply voltage, peripheral counts, and full electrical characteristics should be confirmed in the official Microchip ATmega808 datasheet before final design freeze.
This page synthesizes distributor listings, drop-in alternative data, and engineering selection guidance not found in the manufacturer datasheet, helping engineers source and qualify the ATMEGA808-XU faster.
Drop-in alternatives for ATMEGA808-XU β 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-XU (same form factor and footprint) β differing in Series, Core Processor, Package, SRAM, Flash Memory.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA808-XFR
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA808-XF
β Drop-Inβ In Stock
$0.72 / Unit
View Datasheet βATMEGA4808-XU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA3208-XU
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$0.84 / Unit
View Datasheet βATMEGA1608-XU
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$0.58 / Unit
View Datasheet βATMEGA4808-MUR
β Drop-Inβ In Stock
$1.22 / Unit
View Datasheet βATMEGA808-XU Maximum Ratings & Electrical Characteristics
| Core Processor | AVR 8-bit with hardware multiplier |
| Core Size | 8-bit |
| Speed | 20 MHz |
| Flash Size | 8 KB (8K x 8) |
| SRAM | 1 KB |
| EEPROM | 256 bytes |
| Series | megaAVR 0-series |
| Safety Feature | Functional Safety (FuSa) |
| Package | 28-SSOP |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +125C |
| Peripherals | Core Independent Peripherals (CIPs) |
| Packaging | Tray |
ATMEGA808-XU 28-ssop Pin Configuration Guide
Pin configuration for ATMEGA808-XU (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-XU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA808-XU is suitable for 6 applications: Industrial Control and Automation, Home Appliances, Sensor Nodes and IoT Endpoints, Consumer Electronics, Functional-Safety-Oriented Designs, Motor Control (Small Drives).
Industrial Control and Automation
Factory nodes, motor-driven actuators, and process-control boards demand reliable 8-bit control with industrial temperature tolerance. The ATMEGA808-XU fits this role with its -40C to +125C grade, 20 MHz AVR core with hardware multiplier for control-loop math, and 8 KB Flash sufficient for typical state-machine firmware. Its Core Independent Peripherals continue running timers and serial links during sleep or fault handling, so watchdog and safety routines stay responsive without constant CPU attention. Placed on a two-layer control PCB with the 28-SSOP hand-solderable footprint, the part simplifies production and field repair compared with fine-pitch QFN alternatives, while Functional Safety (FuSa) support eases qualification of safety-related auxiliary logic.
Recommended
Home Appliances
Washers, cookers, and small appliances need low-cost MCUs with robust I/O handling and temperature resilience near motors and heating elements. The ATMEGA808-XU's -40C to +125C rating tolerates cabinet hot spots, and its 256 bytes of EEPROM store user settings and calibration through power cycles. The 20 MHz core with hardware multiplier handles PWM generation for motor drives and ADC-driven user-interface scans with headroom. Core Independent Peripherals offload timer and communication tasks from the main loop, keeping button response snappy under load. The 28-SSOP package is wave-soldering friendly for cost-sensitive high-volume appliance assembly, and the 8 KB Flash accommodates the compact, well-tested firmware typical of appliance control boards.
Recommended
Sensor Nodes and IoT Endpoints
Battery- and energy-harvesting sensor nodes need an MCU that spends most of its life asleep. The ATMEGA808-XU's megaAVR 0-series architecture provides multiple sleep modes and peripheral clock gating, letting Core Independent Peripherals sample sensors or watch for thresholds while the core sleeps. Its event system routes a comparator or timer output directly to another peripheral without waking the CPU, dramatically extending battery life in periodic-reporting nodes. With 8 KB Flash and 1 KB SRAM, compact LoRa or BLE stack endpoint firmware for simple telemetry fits comfortably. The 20 MHz single-cycle core wakes, processes, and returns to sleep quickly, minimizing active current. The SSOP-28 footprint suits small, low-cost two-layer sensor PCBs.
Recommended
Consumer Electronics
Cost-driven consumer products such as chargers, toys, remote controls, and small displays require a dependable, inexpensive 8-bit controller. The ATMEGA808-XU delivers 20 MHz performance with a hardware multiplier at a commodity price point, and the 28-SSOP surface-mount package assembles reliably on high-volume lines. Its 8 KB Flash and 1 KB SRAM cover the finite-state-machine and user-interface firmware typical of consumer devices, while EEPROM preserves pairing data and user preferences across power cycles. The -40C to +125C industrial grade provides margin against enclosed, poorly ventilated products and shipping extremes, reducing warranty failures. Core Independent Peripherals let one MCU manage LED effects, button debouncing, and serial links to display or radio modules concurrently.
Recommended
Functional-Safety-Oriented Designs
Safety-adjacent functions such as interlock monitoring, over-temperature supervision, and diagnostic channels benefit from Microchip's Functional Safety (FuSa) support for the megaAVR 0-series. According to DigiKey's listing, the ATMEGA808-XU is explicitly described as a Functional Safety (FuSa) microcontroller, meaning Microchip supplies supporting documentation to assist compliance workflows. The Core Independent Peripherals contribute here: a comparator or watchdog operating without CPU involvement provides an independent check path against firmware lockup, a classic safety-architecture technique. The 8 KB Flash keeps the safety kernel small enough for thorough code review, and the 20 MHz core reserves ample cycle margin for self-test routines executed alongside the main application loop.
Recommended
Motor Control (Small Drives)
Fans, pumps, and small BLDC drives need precise PWM and responsive closed-loop control. The ATMEGA808-XU's hardware multiplier accelerates the PI-loop arithmetic that dominates small motor firmware, while its 20 MHz single-cycle AVR core keeps PWM update and current-sampling deadlines comfortably met. Core Independent Peripherals can gate PWM outputs on fault-comparator events without software latency, a valuable protection behavior for drive stages. The -40C to +125C temperature grade suits mounting near drive electronics that dissipate heat, and 256 bytes of EEPROM store motor parameter tables across power cycles. The 8 KB Flash capacity fits well-optimized sensorless or Hall-based control schemes for single-motor applications.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA808-XU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA808-XFR | ATMEGA808-XF | ATMEGA4808-XU | ATMEGA1608-XU | ATMEGA4808-MUR |
|---|---|---|---|---|---|---|
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | QFN package - footprint differs |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Speed | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz |
| Flash | 8 KB | 8 KB | 8 KB | 48 KB | 16 KB | 48 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 6 KB | 2 KB | 6 KB |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Functional Safety (FuSa) | Yes | Yes (same family) | Yes (same family) | Yes (same family) | Yes (same family) | Yes (same family) |
Key Differentiators
- Extended industrial temperature grade (vs ATMEGA808-XF)
- Functional Safety (FuSa) positioning (vs Legacy classic-AVR parts such as ATMEGA48-20AU)
- In-place Flash upgrade path (vs ATMEGA4808-XU)
Design Notes
Verify the temperature suffix before substitution: ATMEGA808-XU is graded to +125C while ATMEGA808-XF is graded to +105C per FindMyChip's equivalents data. Swapping an -XF into a -XU socket in a hot enclosure (near motors, power supplies, or sealed housings) can push the die past its rating and cause field failures. Likewise, -R suffixed parts (e.g., ATMEGA808-XFR) are tape-and-reel packaging variants intended for automated assembly - confirm your assembly process before ordering tray versus reel format.
The 28-SSOP outline (0.65 mm pitch, gull-wing leads) is one of the easiest MCU packages to inspect and rework. Provide a solder-mask-defined land pattern per the Microchip datasheet footprint, add 100 nF ceramic decoupling directly across the VDD pin pair, and keep the reset trace short with a 10 kOhm pull-up for reliable programming. Reserve test points for UPDI programming so firmware can be updated in-circuit; the megaAVR 0-series single-wire UPDI interface needs only one GPIO, preserving I/O count on 28-pin designs.
Estimate: supply-voltage range must be confirmed in the official ATmega808 datasheet before design freeze - the provided web data does not state it. As a family-level practice for megaAVR 0-series designs, budget per-peripheral load (timer, USART, comparator) when sizing the regulator, since Core Independent Peripherals keep running during sleep. Use the event system to gate peripherals off rather than disabling them in firmware so the deep-sleep currents quoted in the datasheet are actually achieved in your application.
Compliance Information
Compliance status was not stated in the provided web data. The related ATMEGA808-XFR listing on FindMyChip mentions 'Green' packaging, suggesting lead-free/halogen-free processing for the family, but this must be confirmed on the official Microchip product page before use in compliance documentation.
