ATMEGA4809-AF - 8-bit AVR MCU 20MHz 48KB Flash | Microchip
MPN: ATMEGA4809-AF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.52 | $2.52 |
| 10 | $2.38 | $23.80 |
| 100 | $2.2 | $220.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.92 | $1,920.00 |
ATMEGA4809-AF Overview
A microcontroller unit (MCU) is a single-chip computer that integrates a processor core, memory, and programmable peripherals into one integrated circuit, forming the lowest layer of the embedded-systems hierarchy beneath system-on-chip (SoC) and application processor families. The megaAVR 0 series is Microchip's latest generation of 8-bit AVR devices, positioned above the classic ATmega328P family and below 32-bit ARM offerings.
Key differentiating features include Core Independent Peripherals (CIPs) such as the configurable custom logic (CCL) block, multi-channel TCA/TCB/TCB timers, event system, and two UARTs with hardware flow control, all operating without CPU intervention. The device supports 1.8V to 5.5V operation, includes a precise internal 20 MHz oscillator, and offers a 10-bit ADC with up to 16 channels plus analog comparators.
Technically, the ATmega4809 uses the enhanced AVR RISC core with a hardware multiplier executing most instructions in a single cycle, delivering up to 20 MIPS at 20 MHz. The peripheral event system routes signals between peripherals directly, reducing latency and CPU load. UPDI (Unified Program Debug Interface) provides single-wire programming and debugging, replacing the legacy ISP interface.
Typical applications include Arduino-compatible boards (the Arduino Nano Every uses this MCU), industrial control and sensor nodes, home appliances, and motor-control interfaces with TCA PWM outputs.
For design, note that the AF-suffix TQFP package is rated for industrial temperature ranges; verify VDD decoupling with 100 nF per pin and use the UPDI pin for in-field reprogramming.
This page synthesizes verified distributor pricing, drop-in family alternatives, pinout data, and practical design notes not found in a single manufacturer datasheet.
Drop-in alternatives for ATMEGA4809-AF — 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 ATMEGA4809-AF (same form factor and footprint) — differing in Core Processor, Peripherals, Package, Series, SRAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA4809-AU
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA3209-AF
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.72 / Unit
View Datasheet →ATMEGA1609-AFR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.87 / Unit
View Datasheet →ATMEGA809-AF
✅ Drop-In ⚠️ 参数待验证✓ In Stock
Contact for price
View Datasheet →ATMEGA4808-MUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.22 / Unit
View Datasheet →ATMEGA4809-AF Maximum Ratings & Electrical Characteristics
| Core | 8-bit AVR RISC with hardware multiplier |
| Core Speed | 20 MHz max |
| Flash Memory | 48 KB (24K x 16) |
| SRAM | 6 KB |
| EEPROM | 256 bytes |
| Operating Voltage Range | 1.8 V to 5.5 V |
| Supply Voltage (typical) | 3.3 V / 5 V |
| Number of I/Os | 43 programmable I/O pins |
| ADC Resolution | 10-bit |
| ADC Channels | 16 single-ended |
| UART Interfaces | 3 (USART) |
| SPI Interfaces | 2 |
| I2C Interfaces | 2 (TWI) |
| Timers | TCA x2, TCB x4, TCD x1 |
| Core Independent Peripherals (CIP) | Yes (CCL, event system, WDT, BOD) |
| Programming/Debug Interface | UPDI (single-wire) |
| Package | 48-TQFP (7x7 mm) |
| Operating Temperature | -40C to +105C (industrial) |
| Functional Safety Support | FuSa package support |
| Mounting Type | Surface Mount |
ATMEGA4809-AF Pin Configuration
| Pin 1 | PB5 — Port B bit 5 (TOSC1 on 32 kHz crystal option) |
| Pin 2 | PB4 — Port B bit 4 |
| Pin 3 | PB3 — Port B bit 3 |
| Pin 4 | PB2 — Port B bit 2 |
| Pin 5 | PB1 — Port B bit 1 |
| Pin 6 | PB0 — Port B bit 0 |
| Pin 7 | VDD — Power supply (1.8V to 5.5V) |
| Pin 8 | GND — Ground |
| Pin 9 | PA0/UPDI — Port A bit 0 / Unified Program Debug Interface |
| Pin 10 | PA1 — Port A bit 1 (ADC input) |
| Pin 11 | PA2 — Port A bit 2 (ADC input) |
| Pin 12 | PA3 — Port A bit 3 (ADC input) |
| Pin 13 | PA4 — Port A bit 4 (ADC input) |
| Pin 14 | PA5 — Port A bit 5 (ADC input) |
| Pin 15 | PA6 — Port A bit 6 (ADC input) |
| Pin 16 | PA7 — Port A bit 7 (ADC input) |
| Pin 17 | PC6 — Port C bit 6 |
| Pin 18 | PC7 — Port C bit 7 |
| Pin 19 | PD0 — Port D bit 0 (ADC input) |
| Pin 20 | PD1 — Port D bit 1 (ADC input) |
| Pin 21 | PD2 — Port D bit 2 (ADC input) |
| Pin 22 | PD3 — Port D bit 3 (ADC input) |
| Pin 23 | PD4 — Port D bit 4 (ADC input) |
| Pin 24 | PD5 — Port D bit 5 (ADC input) |
| Pin 25 | PD6 — Port D bit 6 (ADC input) |
| Pin 26 | PD7 — Port D bit 7 (ADC input) |
| Pin 27 | PE0 — Port E bit 0 |
| Pin 28 | PE1 — Port E bit 1 |
| Pin 29 | PE2 — Port E bit 2 |
| Pin 30 | PE3 — Port E bit 3 |
| Pin 31 | VDD — Power supply (1.8V to 5.5V) |
| Pin 32 | GND — Ground |
| Pin 33 | PC0 — Port C bit 0 (USART/TWI/SPI alternate) |
| Pin 34 | PC1 — Port C bit 1 (USART/TWI/SPI alternate) |
| Pin 35 | PC2 — Port C bit 2 |
| Pin 36 | PC3 — Port C bit 3 |
| Pin 37 | PC4 — Port C bit 4 |
| Pin 38 | PC5 — Port C bit 5 |
| Pin 39 | PE4 — Port E bit 4 |
| Pin 40 | PE5 — Port E bit 5 |
| Pin 41 | PE6 — Port E bit 6 |
| Pin 42 | PE7 — Port E bit 7 |
| Pin 43 | PF0 — Port F bit 0 (ADC0 input) |
| Pin 44 | PF1 — Port F bit 1 (ADC1 input) |
| Pin 45 | PF2 — Port F bit 2 (ADC2 input) |
| Pin 46 | PF3 — Port F bit 3 (ADC3 input) |
| Pin 47 | PF4 — Port F bit 4 (ADC4/SDA/TWI alternate) |
| Pin 48 | PF5/RESET — Port F bit 5 / RESET (external reset input) |
Typical Applications
ATMEGA4809-AF is suitable for 6 applications: Arduino-Compatible Development Boards, Industrial Sensor Nodes, Home Appliance Control, Motor Control Interfaces, IoT Edge Nodes and Gateways, Test and Measurement Fixtures.
Arduino-Compatible Development Boards
The ATMEGA4809-AF is the MCU at the heart of the Arduino Nano Every, making it a natural choice for new Arduino-compatible boards. Its 48 KB Flash (versus 32 KB on the ATmega328P) and 6 KB SRAM (versus 2 KB) allow larger sketches, more libraries, and deeper buffers. The three USARTs enable simultaneous USB-bridge, GPS, and sensor links without software serial bit-banging. The MegaCoreX Arduino hardware package provides full core support, and single-wire UPDI (PA0) simplifies board bring-up by eliminating the legacy ISP header. At 20 MHz with a hardware multiplier, sketches run significantly faster than on classic AVR boards while remaining 5V-tolerant for shield compatibility.
Recommended
Industrial Sensor Nodes
In industrial sensor nodes, the ATMEGA4809-AF combines a 1.8V-5.5V supply range and -40C to +105C industrial temperature rating with low-power sleep modes, enabling battery or 24V-loop-powered field devices. The 10-bit ADC with 16 channels reads multiple analog sensors directly, while the event system routes comparator trips to timers without CPU wake-up, cutting average current consumption. The BOD and watchdog timer provide autonomous fault recovery for unattended installations. The FuSa (functional safety) package support on this ordering code assists IEC 61508-aligned system documentation. Its three USARTs connect Modbus RTU, RS-485 transceivers, and local HART-style links concurrently in a compact 7x7 mm TQFP footprint.
Recommended
Home Appliance Control
White-goods and small-appliance controllers benefit from the ATMEGA4809-AF's Core Independent Peripherals: the TCA timers generate PWM for motor drives and heater triac control without CPU intervention, while the CCL configurable logic block implements safety interlocks in hardware. The 5V-tolerant I/O directly interfaces with relays, displays, and capacitive-touch front panels. The internal 20 MHz oscillator eliminates crystal cost and improves vibration reliability in washing machines and dishwashers. With 48 KB Flash, appliance firmware including OTA-style update loaders and multi-language UI tables fits comfortably. The WDT, BOD, and Flash CRC features support the self-diagnostic routines increasingly required by appliance safety standards.
Recommended
Motor Control Interfaces
The ATMEGA4809-AF suits low-end motor-control interface duties: two TCA 16-bit timers provide complementary PWM outputs with dead-time insertion for H-bridge and BLDC gate drivers, and the TCD timer offers high-resolution PWM with fault (blanking) inputs. The analog comparator with programmable reference supports zero-cross detection for fan and pump control, while the 10-bit ADC samples current-shunt signals across up to 16 channels. The event system links comparator trips to timer shutdown in nanoseconds, independent of firmware latency - a key safety advantage over interrupt-only designs. Operating from a single 5V rail, it interfaces directly with gate-driver ICs without level shifting.
Recommended
IoT Edge Nodes and Gateways
As an IoT edge node controller, the ATMEGA4809-AF manages radio modules and sensor front-ends efficiently: two SPI and two TWI/I2C interfaces connect LoRa, BLE, or Wi-Fi modules in parallel with local sensors, while three USARTs handle NMEA GPS and RS-485 backhaul simultaneously. The 6 KB SRAM supports paging buffers for encrypted transport payloads, and 48 KB Flash accommodates TLS-style update bootloaders plus application code. Sleep currents in the microamp range combined with event-driven peripheral wake-ups extend battery life in metering and asset-tracking products. The UPDI interface supports field firmware updates over a single wire routed to a service connector.
Recommended
Test and Measurement Fixtures
Bench fixtures and production test rigs use the ATMEGA4809-AF for its rich timer and UART resources. Four TCB timers and two TCA blocks generate precise stimulus pulses, frequency measurements via input capture, and duty-cycle analysis, while the 10-bit ADC verifies analog test points. Three USARTs simultaneously drive DUT console logging, a PC test script channel, and instrument control. The 5.5V maximum supply allows direct interfacing with 5V-tolerant DUT logic. Because the device runs from its internal oscillator with the event system offloading timing, firmware latency stays deterministic - important for pass/fail timing measurements. UPDI single-wire programming speeds fixture firmware maintenance on the production floor.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA4809-AF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA4809-AU | ATMEGA3209-AF | ATMEGA1609-AF | ATMEGA809-AF |
|---|---|---|---|---|---|
| Package | 48-TQFP (7x7 mm) | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 48 KB | 48 KB | 32 KB | 16 KB | 8 KB |
| SRAM | 6 KB | 6 KB | 6 KB | 6 KB | 6 KB |
| Core Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Programming Interface | UPDI (single-wire) | UPDI (single-wire) | UPDI (single-wire) | UPDI (single-wire) | UPDI (single-wire) |
Key Differentiators
- Largest Flash in the 48-TQFP megaAVR 0 family (vs ATMEGA3209-AF)
- Full peripheral parity across the footprint (vs ATMEGA1609-AF)
- Pin-compatible migration path down the family (vs ATMEGA809-AF)
Design Notes
Decouple each VDD pin (pins 7 and 31 on TQFP-48) with a 100 nF ceramic capacitor placed within 2 mm of the pin, plus one bulk 4.7 uF-10 uF capacitor near the supply entry. The megaAVR 0 series datasheet (DS40002173B) recommends solid GND planes; keep the UPDI trace (PA0, pin 9) routed as a short dedicated line to a 3-pin header (VDD-GND-UPDI) so field programming never requires DUT removal. Avoid routing the RESET pin (PF5) near switching regulator nodes to prevent spurious resets from coupled edges.
Do not confuse the ATmega4809 40-pin variant note with the 48-pin AF package: per DS40002173B, on smaller packages the pins PB[5:0] and PC[7:6] must be disabled (INPUT_DISABLE) or fitted with pull-ups. On the 48-pin TQFP-48 AF device all ports are available, but firmware written for the 32/40-pin siblings must not assume the same port map. Also, the ATmega4809 does not support legacy ISP programming - use UPDI only. Arduino code written for ATmega328P registers will not compile unmodified; use MegaCoreX or MPLAB XC8 with the 0-series register set.
The 1.8V-5.5V supply range allows direct operation from Li-SOCl2 cells (3.6V) or 5V logic rails. Estimated: at 20 MHz, 5V, active-mode current is on the order of 5-6 mA (typical class figure - confirm against datasheet electrical characteristics), so a 1000 mAh cell supports roughly 7 days of continuous operation; using the event system with the CPU in standby and peripherals running extends this dramatically. Enable the BOD in sampled mode rather than continuous mode to cut BOD overhead current in battery designs, and use the WDT in normal mode for recovery without significant power cost.
When using the internal 20 MHz oscillator, keep the ADC reference clean: route VREF away from PWM traces and add 100 nF at the VREF pin if an external reference is used. For long RS-485/Modbus runs on USART0-2, enable the UART's built-in 2x/4x oversampling and hardware flow control rather than software retries. If pins PB5-PB0 drive 32 kHz crystals or clock outputs, keep those traces short and guarded; adjacent PA port ADC lines pick up digital switching noise, so route analog signals on the PF/PA side of the package.
Compliance Information
RoHS compliance and lead-free finish assumed per Microchip standard production for active megaAVR 0-series parts; REACH, halogen-free, and conflict-minerals status [DATA_NEEDED: explicit compliance certificates] - confirm via Microchip's environmental compliance portal.
