ATMEGA4808-AFR - 8-bit AVR MCU 20MHz 48KB Flash TQFP-32 | Microchip
MPN: ATMEGA4808-AFR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.48 | $2.48 |
| 10 | $2.29 | $22.90 |
| 100 | $2.05 | $205.00 |
| 500 | $1.88 | $940.00 |
| 1,000 | $1.72 | $1,720.00 |
ATMEGA4808-AFR Overview
A microcontroller (MCU) is a single-chip computer that combines a processor core, memory, and peripherals such as timers, serial interfaces, and analog-to-digital converters. The megaAVR 0-series sits within the broader AVR 8-bit family, which sits under the general microcontroller (embedded processor) category. Unlike general-purpose processors, MCUs execute dedicated control tasks in embedded systems, industrial automation, and consumer devices.
Key features of the ATMEGA4808-AFR include a hardware multiplier in the AVR core for efficient arithmetic, 20 MHz maximum clock frequency from an internal oscillator, a 12-channel 10-bit ADC, and Functional Safety (FuSa) qualification supporting safety-oriented designs. The -AFR ordering code denotes the 32-pin TQFP package, -40C to +125C industrial operating range, and tape-and-reel packaging.
Technically, the megaAVR 0-series uses the latest AVR core with a two-stage pipeline, peripheral-rich architecture with configurable custom logic (CCL), event system, and multiple USART, SPI, and TWI (I2C) serial interfaces. The wide 1.8V-5.5V supply range allows direct operation from lithium cells, 3.3V logic, or 5V industrial rails without a dedicated regulator.
Typical applications include industrial control and factory automation nodes, motor control and sensor interfaces using the 10-bit ADC, and consumer appliances or HVAC controllers where wide-voltage tolerance reduces system cost.
A key design consideration: use the internal oscillator to save BOM cost, but verify ADC clock configuration (prescaler) for accurate 10-bit conversions across the 1.8V-5.5V range.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATMEGA4808-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 ATMEGA4808-AFR (same form factor and footprint) — differing in Core Processor, Operating Temperature, Series, Package, EEPROM Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA3208-AFR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.62 / Unit
View Datasheet →ATMEGA1608-AFR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.81 / Unit
View Datasheet →ATMEGA808-AFR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.79 / Unit
View Datasheet →ATMEGA4808-XFR
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA4808-AFR Maximum Ratings & Electrical Characteristics
| Core Processor | AVR (megaAVR 0-series), 8-bit |
| Core Size | 8-bit |
| Speed | 20 MHz |
| Program Memory Size | 48KB (48K x 8) |
| Program Memory Type | FLASH |
| EEPROM Size | 256 x 8 |
| RAM Size | 6K x 8 |
| Voltage - Supply (Vcc/Vdd) | 1.8V ~ 5.5V |
| Data Converters | A/D 12x10b |
| Oscillator Type | Internal |
| Operating Temperature | -40C ~ 125C |
| Package | 32-TQFP (7x7 mm) |
| Mounting Type | Surface Mount |
| Safety Qualification | Functional Safety (FuSa) |
| Hardware Multiplier | Yes |
| Series | megaAVR 0 |
| Packaging | Tape & Reel (R suffix) |
ATMEGA4808-AFR 32-tqfp (7x7 mm) Pin Configuration Guide
Pin configuration for ATMEGA4808-AFR (32-tqfp (7x7 mm) 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 ATMEGA4808-AFR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA4808-AFR is suitable for 6 applications: Industrial Control and Automation, Sensor Interfaces and Data Acquisition, Home Appliances and HVAC Control, Motor Control and PWM Drive, IoT Sensor Nodes and Connected Devices, Consumer Electronics and Battery-Powered Devices.
Industrial Control and Automation
The ATMEGA4808-AFR fits industrial control nodes because its -40C to +125C operating range tolerates cabinet-level temperature excursions, and its 1.8V-5.5V supply accepts noisy 5V industrial rails directly. The 12-channel 10-bit ADC reads multiple analog sensors (potentiometers, current shunts, thermistors) without an external converter, while three USART/SPI/TWI serial interfaces connect to PLC backplanes and field devices. The Functional Safety (FuSa) designation and 20 MHz AVR core with hardware multiplier enable deterministic control loops. Placed on a sensor/actuator board, the event system routes peripheral signals without CPU intervention, reducing interrupt latency; trade-off is that certified safety system design must add external diagnostics per the safety manual.
Recommended
Sensor Interfaces and Data Acquisition
The ATMEGA4808-AFR suits multi-sensor acquisition front-ends because its 12-channel 10-bit ADC digitizes up to twelve analog inputs across the 1.8V-5.5V range, with an internal oscillator eliminating an external crystal for lower BOM cost. In a typical design the MCU is placed between analog conditioning and a UART/SPI link, sampling thermistors, pressure bridges, or potentiometers at kHz rates; the hardware multiplier accelerates scaling and filtering math in C. The 6KB SRAM buffers sample blocks before transmission over USART. For accuracy-critical channels, use the internal reference or VDD reference with a prescaled ADC clock per the datasheet; expect a few LSBs of noise, so oversampling is the standard mitigation.
Recommended
Home Appliances and HVAC Control
White-goods and HVAC controllers benefit from the ATMEGA4808-AFR's wide 1.8V-5.5V supply, which tolerates mains-derived supply sag, and its -40C to +125C grade covering compressor-bay heat. The 48KB Flash holds UI state machines, communication stacks, and fault-logging code, while 256 bytes of EEPROM persist user settings and error counters across power cycles. A typical topology uses TWI to drive the display, ADC channels for NTC temperature sensing, and PWM timers for fan or damper control. The internal 20 MHz oscillator removes the crystal from the BOM; the main consideration is EMI hardening of I/O near motor drives, using the CCL and input filtering per Microchip appliance reference designs.
Recommended
Motor Control and PWM Drive
The ATMEGA4808-AFR supports small motor drive boards using its hardware PWM timers and 20 MHz core with hardware multiplier for control-law computation. The 10-bit ADC samples current shunts and back-EMF feedback, and the event system routes comparator or timer events to PWM gating with minimal CPU load - useful for fan, pump, and small BLDC applications. Running from a 5V rail, gate-drive logic levels interface directly to driver ICs. A practical trade-off: this part has no dedicated motor-control peripheral set like larger AVRs, so commutation is software-scheduled; keep the control ISR short and use the CCL for fault shutdown. The FuSa designation assists safety-relevant fan/stall monitoring designs.
Recommended
IoT Sensor Nodes and Connected Devices
For battery- or line-powered IoT nodes, the ATMEGA4808-AFR's internal 20 MHz oscillator, UPDI single-wire programming, and 1.8V operation at the low end of the supply range support low-power operation directly from two AA cells or a 3.3V rail. The 48KB Flash accommodates a sensor driver plus a lightweight protocol stack (e.g., UART-to-radio-module bridging), and the 6KB SRAM buffers telemetry frames. A common topology places the MCU between sensors and a wireless module over USART or SPI, sleeping between samples. Design consideration: verify sleep-mode current figures in the manufacturer datasheet for your target battery life, as low-power optimization depends on clock and BOD configuration rather than silicon alone.
Recommended
Consumer Electronics and Battery-Powered Devices
Consumer products such as chargers, small displays, toys, and personal devices use the ATMEGA4808-AFR because its 1.8V minimum supply allows direct operation from a single lithium cell near end-of-discharge, and tape-and-reel delivery supports automated SMT assembly. The hardware multiplier speeds up any scaling math for gauges or audio feedback, and 48KB Flash leaves headroom for firmware updates in the field. Typical usage: MCU drives keypad scanning, ADC battery monitoring, and TWI peripheral control. The main design consideration is cost versus the smaller ATMEGA3208/1608 in the same footprint - choose the 4808 only when firmware genuinely needs the extra memory, since all three solder onto the identical 7x7 mm TQFP land pattern.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA4808-AFR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA3208-AFR | ATMEGA1608-AFR | ATMEGA808-AFR | ATMEGA4808-XFR |
|---|---|---|---|---|---|
| Package | 32-TQFP (7x7 mm) | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 48KB (48K x 8) | 32KB (32K x 8) | 16KB (16K x 8) | 8KB (8K x 8) | 48KB (48K x 8) |
| SRAM | 6K x 8 | 4K x 8 | 2K x 8 | 1K x 8 | 6K x 8 |
| EEPROM | 256 x 8 | 256 x 8 | 256 x 8 | 256 x 8 | 256 x 8 |
| Max Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Supply Voltage | 1.8V ~ 5.5V | 1.8V ~ 5.5V | 1.8V ~ 5.5V | 1.8V ~ 5.5V | 1.8V ~ 5.5V |
| Operating Temperature | -40C ~ 125C | -40C ~ 125C | -40C ~ 125C | -40C ~ 125C | -40C ~ 105C (extended grade) |
Key Differentiators
- Largest Flash in the 32-TQFP megaAVR 0-series footprint (vs ATMEGA3208-AFR)
- Full industrial temperature range (vs ATMEGA4808-XFR)
- Functional Safety (FuSa) designation (vs ATMEGA808-AFR)
Design Notes
The ATMEGA4808-AFR accepts 1.8V-5.5V, but ADC accuracy and maximum clock behavior vary with VDD. At 5V the full 20 MHz range is safe; at the low end of the supply range, consult the datasheet frequency-vs-voltage derating curve before configuring clocks. Place a 100nF ceramic capacitor at each VDD pin plus one bulk 4.7uF-10uF capacitor per supply domain. Because the internal oscillator removes the external crystal, clock tolerance for UART timing must come from the internal oscillator calibration - verify baud-rate error margins at your temperature extremes.
The 32-TQFP (7x7 mm) has 0.8 mm pin pitch - route with standard 6/6 mil rules. Use the exposed pin-1 dot on the package SVG diagram for orientation and keep the UPDI pin (PA0) routed to a 3-pad programming header (UPDI, VDD, GND) so in-system programming with MPLAB SNAP or Atmel-ICE never requires board rework. Keep analog ADC inputs away from switching traces; use a ground pour under the MCU and dedicated analog section on one board edge. Reference Microchip megaAVR 0-series hardware design application notes for decoupling topology.
Do not assume drop-in compatibility with the ATMEGA4809 - the 40/48-pin packages have different land patterns despite identical silicon. Second, the -AFR suffix means -40C to +125C temperature grade with tape-and-reel packing; using an -AF part in a reflow line is fine but reel quantities differ. Third, UPDI programming replaces classic ISP - legacy AVR programmers will not work, so update your programming fixture. Finally, if substituting ATMEGA3208/1608/808 in the same footprint, verify Flash/SRAM linker fit and EEPROM usage (256 bytes on all variants) before release.
Compliance Information
Compliance statuses not stated in the provided web data; verify on the Microchip product page or distributor environmental data sheets before release.
