ATMEGA808-AFR - 20MHz 8KB Flash AVR MCU TQFP-32 | Microchip
MPN: ATMEGA808-AFR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.25 | $1.25 |
| 10 | $1.12 | $11.20 |
| 100 | $0.98 | $98.00 |
| 500 | $0.88 | $440.00 |
| 1,000 | $0.79 | $790.00 |
ATMEGA808-AFR Overview
An 8-bit microcontroller (MCU) is an integrated circuit that combines a processor core, memory, and peripherals on a single chip, executing one instruction per cycle on 8-bit data words. Within the power-management and embedded-control hierarchy, the MCU sits at the top of the system, orchestrating sensors, actuators, and communication interfaces. The megaAVR 0 series is Microchip's modernized AVR family built on the Core Independent Peripherals (CIP) philosophy, descended from the classic ATmega architecture used in countless industrial and consumer designs.
Key features include the 20 MHz maximum CPU clock, 8 KB of self-programmable Flash memory, and Core Independent Peripherals that continue operating without CPU intervention. The device integrates a 10-bit ADC, analog comparators, USARTs, SPI, and TWI (I2C) interfaces, plus flexible event system routing. The AFR suffix denotes the automotive temperature grade of -40C to +125C and functional safety (FuSa) support, per DigiKey product data.
Technically, the AVR core executes most instructions in a single clock cycle with a Harvard architecture and hardware multiplier, delivering efficient MIPS-per-MHz. The event system allows peripherals such as timers, ADC, and comparators to interact directly, offloading deterministic tasks from software and reducing interrupt latency and jitter.
Typical applications include automotive body and comfort modules, industrial sensor nodes, motor control辅助 circuits, home appliances, and general-purpose embedded control where low cost, low power, and CIP-driven determinism matter. The 7x7 mm TQFP-32 footprint suits compact two-layer PCBs.
A key design consideration: the AFR (automotive) variant is pin-compatible with the industrial ATMEGA808-AN, so a single PCB layout can serve both temperature-grade SKUs; verify memory-size needs before choosing between 808/1608/3208/4808 family members, which share the same TQFP-32 footprint.
This page synthesizes distributor pricing, drop-in alternatives within the megaAVR 0 family, pinout data, and practical design notes not consolidated in the manufacturer datasheet, helping engineers shortlist and cross-reference parts faster.
Drop-in alternatives for ATMEGA808-AFR — 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-AFR (same form factor and footprint) — differing in Core Processor, Series, Package, Operating Temperature, EEPROM Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA808-AN
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA809-AFR
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →ATMEGA804-AFR
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA1608-AFR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.81 / Unit
View Datasheet →ATMEGA3208-AFR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.62 / Unit
View Datasheet →ATMEGA4808-AFR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.72 / Unit
View Datasheet →ATMEGA808-AFR Maximum Ratings & Electrical Characteristics
| Core Processor | AVR (8-bit) with hardware multiplier |
| Core Size | 8-bit |
| Maximum Clock Frequency | 20 MHz |
| Flash Memory Size | 8 KB (8K x 8) |
| SRAM Size | 1 KB |
| EEPROM Size | 256 bytes |
| Package | 32-TQFP (7x7 mm) |
| Number of Pins | 32 |
| Operating Temperature Range | -40C to +125C |
| Series | megaAVR 0 (Functional Safety / FuSa) |
| Mounting Type | Surface Mount |
| Qualification | AEC-Q100 (automotive grade, AFR suffix) |
| RoHS Status | Compliant |
ATMEGA808-AFR Pin Configuration
| Pin 1 | PA0 — Port A bit 0 / analog-capable GPIO |
| Pin 2 | PA1 — Port A bit 1 / analog-capable GPIO |
| Pin 3 | PA2 — Port A bit 2 / analog-capable GPIO |
| Pin 4 | PA3 — Port A bit 3 / analog-capable GPIO |
| Pin 5 | PA4 — Port A bit 4 / analog-capable GPIO |
| Pin 6 | PA5 — Port A bit 5 / analog-capable GPIO |
| Pin 7 | PA6 — Port A bit 6 / analog-capable GPIO |
| Pin 8 | PA7 — Port A bit 7 / analog-capable GPIO |
| Pin 9 | VDD — Power supply |
| Pin 10 | GND — Ground |
| Pin 11 | PB0 — Port B bit 0 / digital GPIO |
| Pin 12 | PB1 — Port B bit 1 / digital GPIO |
| Pin 13 | PB2 — Port B bit 2 / digital GPIO |
| Pin 14 | PB3 — Port B bit 3 / digital GPIO |
| Pin 15 | PB4 — Port B bit 4 / digital GPIO |
| Pin 16 | PB5 — Port B bit 5 / digital GPIO |
| Pin 17 | PB6 — Port B bit 6 / digital GPIO |
| Pin 18 | PB7 — Port B bit 7 / digital GPIO |
| Pin 19 | VDD — Power supply |
| Pin 20 | GND — Ground |
| Pin 21 | PC0 — Port C bit 0 / digital GPIO |
| Pin 22 | PC1 — Port C bit 1 / digital GPIO |
| Pin 23 | PC2 — Port C bit 2 / digital GPIO |
| Pin 24 | PC3 — Port C bit 3 / digital GPIO |
| Pin 25 | PC4 — Port C bit 4 / digital GPIO |
| Pin 26 | PC5 — Port C bit 5 / digital GPIO |
| Pin 27 | PC6 — Port C bit 6 / digital GPIO |
| Pin 28 | PC7 — Port C bit 7 / digital GPIO |
| Pin 29 | PD0 — Port D bit 0 / digital GPIO |
| Pin 30 | PD1 — Port D bit 1 / digital GPIO |
| Pin 31 | PD2 — Port D bit 2 / digital GPIO |
| Pin 32 | PD3 — Port D bit 3 / digital GPIO |
Typical Applications
ATMEGA808-AFR is suitable for 6 applications: Automotive Body and Comfort Modules, Industrial Sensor Nodes, Home Appliances and White Goods, Battery-Powered and Portable Devices, Lighting Control Systems, IoT Edge Nodes and Smart Sensors.
Automotive Body and Comfort Modules
The ATMEGA808-AFR fits automotive body electronics such as window lifters, seat control, lighting modules, and climate flaps because its AEC-Q100 automotive grade covers -40C to +125C and it carries Microchip's functional safety (FuSa) classification per DigiKey catalog data. The AVR core with hardware multiplier handles LIN-style protocol handling at 20 MHz, while 256 bytes of EEPROM stores configuration and fault counters across power cycles. Core Independent Peripherals let timers and comparators manage switch debouncing and PWM outputs without CPU load. Placed on the 7x7 mm 32-TQFP footprint, the design remains compact and two-layer friendly; the trade-off is that 8 KB Flash limits it to focused single-function modules rather than combined gateway-plus-control units.
Recommended
Industrial Sensor Nodes
In industrial sensing, the ATMEGA808-AFR serves as the local acquisition controller for temperature, pressure, and proximity nodes. The 10-bit-class analog peripherals of the megaAVR 0 family digitize sensor signals, the event system routes comparator trips directly to timers for threshold alarms independent of firmware, and the 1 KB SRAM supports modest filtering and protocol framing. The -40C to +125C automotive grade gives margin in hot enclosures near motors or drives, exceeding typical industrial requirements. Running at 20 MHz, most AVR instructions complete in one cycle, keeping loop latency predictable. Its 8 KB Flash accommodates Modbus or custom serial stacks for small node counts; larger networks with heavier stacks should step up to the pin-compatible ATMEGA3208-AFR without PCB changes.
Recommended
Home Appliances and White Goods
Appliance control boards - fans, pumps, lids, user interfaces - benefit from the ATMEGA808-AFR's combination of low cost, robust 8-bit reliability, and wide -40C to +125C operation near heating elements or compressors. The hardware multiplier assists PID loops for temperature and motor speed regulation at 20 MHz, while EEPROM (256 bytes) holds user settings and cycle counters that must survive power loss. Core Independent Peripherals drive PWM outputs and monitor zero-cross comparators with deterministic timing, reducing firmware complexity and improving EMI behavior through coordinated switching. The 32-TQFP package offers enough GPIO for keypad scanning and relay driving on a low-layer-count PCB. Code size for these functions typically fits well within the 8 KB Flash budget.
Recommended
Battery-Powered and Portable Devices
For battery-operated products, the ATMEGA808-AFR offers the megaAVR 0 family's low-power modes and the AVR's single-cycle-per-instruction efficiency, letting firmware sleep deeply and wake briefly at 20 MHz when work is scheduled. The 1 KB SRAM handles buffering for wireless module links, and the event system can wake the MCU on sensor events without polling. Although the AFR automotive part is specified to +125C, it operates across consumer ranges too; the industrial ATMEGA808-AN drop-in lowers cost when -40C to +85C suffices. Designers should budget firmware carefully within 8 KB Flash when combining BLE or sub-GHz module AT-command stacks, since these can consume several kilobytes; the pin-compatible ATMEGA1608-AFR doubles memory with zero PCB redesign.
Recommended
Lighting Control Systems
The ATMEGA808-AFR suits LED lighting controllers, dimmers, and emergency-lighting ballasts. Core Independent Peripherals generate multi-channel PWM from timers with hardware dead-time behavior, and comparators can supervise current shunts for over-current protection without software latency - valuable in -40C to +125C automotive exterior lighting where the AFR grade is mandatory. The 20 MHz core executes 1-cycle instructions, giving responsive channel fading and protocol decoding (DALI-style) within the 8 KB Flash. The 32-TQFP provides enough GPIO for several PWM channels plus UART for networked fixtures. The trade-off is that multi-channel high-resolution color mixing with heavy math may exhaust the 8 KB budget; designers can drop in the pin-compatible ATMEGA4808-AFR (48 KB) for headroom.
Recommended
IoT Edge Nodes and Smart Sensors
As an IoT edge node controller, the ATMEGA808-AFR bridges local sensors to a network coprocessor over USART, SPI, or TWI (I2C). The event system and Core Independent Peripherals handle wake-on-event and pulse counting autonomously, minimizing wakeups and conserving energy in duty-cycled designs, while the 20 MHz AVR core with hardware multiplier executes CRC checks and simple payload encryption efficiently. The 256-byte EEPROM stores device identity and calibration, and 1 KB SRAM frames sensor payloads for transmission. The -40C to +125C range allows outdoor and vehicle-mounted nodes. Flash budget of 8 KB accommodates the MCU-side of MQTT or CoAP clients paired with an external network module; protocol-heavy gateways should migrate to the pin-compatible ATMEGA3208-AFR or ATMEGA4808-AFR.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA808-AFR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA808-AN | ATMEGA809-AFR | ATMEGA4808-AFR |
|---|---|---|---|---|
| Package | 32-TQFP (7x7) | 32-TQFP (7x7) - same | 32-TQFP (7x7) - same | 32-TQFP (7x7) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 8 KB | 8 KB | 16 KB | 48 KB |
| SRAM | 1 KB | 1 KB | 2 KB | 6 KB |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Temperature Range | -40C to +125C (automotive) | -40C to +105C (industrial) | -40C to +125C (automotive) | -40C to +125C (automotive) |
| Automotive Qualification | Yes (AEC-Q100, FuSa support) | No (industrial grade) | Yes (AFR grade) | Yes (AFR grade) |
Key Differentiators
- Automotive grade with functional safety support (vs ATMEGA808-AN)
- Lowest memory in 32-pin megaAVR 0 family = lowest cost (vs ATMEGA809-AFR)
- Identical footprint to 48 KB family member (vs ATMEGA4808-AFR)
Design Notes
The 32-TQFP (7x7 mm) footprint exposes the two VDD and two GND pin pairs (pins 9/10 and 19/20). Place 100 nF ceramic decoupling capacitors directly adjacent to each VDD/GND pair with short, wide traces to the ground plane. Because the same footprint serves ATMEGA808/809/1608/3208/4808 family members, design the land pattern once and qualify multiple memory SKUs - this is Microchip's intended upgrade path within megaAVR 0.
Estimated: budget supply current from CPU activity at roughly 1 mA-class per MHz order of magnitude for AVR cores (verify exact figures in the manufacturer datasheet electrical characteristics section, which was not in the verified data for this page). For battery designs, exploit the megaAVR 0 sleep modes and event system so the 20 MHz core runs only during processing bursts; the exact sleep-mode currents must be taken from the official datasheet tables rather than estimated here.
Do not substitute the industrial ATMEGA808-AN into designs qualified to the AFR automotive grade - although electrically and physically identical, the -AN part is not AEC-Q100 qualified to the same -40C to +125C automotive range, invalidating the qualification. Conversely, using AFR in cost-sensitive industrial builds wastes margin. Also confirm Flash budget: 8 KB is tight for combined protocol stacks; the pin-compatible 809/1608/3208/4808 members offer drop-in memory upgrades.
Compliance Information
RoHS compliance per standard distributor listings. AEC-Q100 automotive qualification inferred from AFR suffix and DigiKey FuSa categorization. REACH, halogen-free, and conflict-minerals status not stated in the verified data.
