ATMEGA4808-MFR - 8-bit AVR MCU 20MHz 48KB Flash FuSa | Microchip
N.º de pieza: ATMEGA4808-MFR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $1.42 | $1,42 |
| 10 | $1.28 | $12,80 |
| 100 | $1.1 | $110,00 |
| 500 | $0.95 | $475,00 |
| 1.000 | $0.82 | $820,00 |
ATMEGA4808-MFR Descripción general
A microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and peripherals into one chip, serving as the compute element of embedded systems. Within the semiconductor hierarchy, the ATMEGA4808 belongs to the microcontroller -> 8-bit MCU -> AVR MCU taxonomy, and the megaAVR 0-series is the latest generation of the classic AVR architecture, replacing aging megaAVR parts such as the ATmega328P family in new designs.
Key features include the AVR processor core with a hardware multiplier, a maximum clock frequency of 20 MHz, a 10-bit ADC, analog comparators, USARTs, SPI, TWI (I2C) interfaces, and a Peripheral Touch Controller (PTC) for capacitive touch sensing. The megaAVR 0-series also integrates a Multi-Voltage I/O (MVIO) capability on select family members and configurable custom logic (CCL), allowing glue logic to be implemented in hardware.
The -MFR ordering suffix identifies the Functional Safety (FuSa) qualified variant, developed per Microchip's functional-safety documentation package for IEC 61508 / ISO 26262-oriented designs, making it suitable for safety-critical industrial and automotive-adjacent applications where certification evidence is required.
Typical applications include industrial control and automation nodes, home appliances, IoT sensor endpoints, capacitive-touch user interfaces, and motor control auxiliary logic. The 20 MHz core and 48 KB Flash provide headroom for C-based application code while retaining the low pin count and low BOM cost expected of 8-bit designs.
Design consideration: the ATMEGA4808 is programmed and debugged over UPDI (Unified Program and Debug Interface), a single-wire interface, so reserve one GPIO pad (PA0) on the PCB for UPDI access; legacy ISP programmers are not compatible with the 0-series.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet, with pricing verified as of 2026-09-18.
Alternativas directas para ATMEGA4808-MFR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ATMEGA4808-MFR (mismo factor de forma y huella) — difiere en Core Processor, SRAM, Package, Programming Interface, SRAM Size.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ATMEGA3208-MF
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$0.98 / unidad
Ver hoja de datos →ATMEGA1608-MF
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$0.94 / unidad
Ver hoja de datos →ATMEGA808-MF
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$0.95 / unidad
Ver hoja de datos →ATMEGA4808-MF
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$1.7 / unidad
Ver hoja de datos →ATMEGA4808-MFR
✅ Sustitución directa✓ En stock
$0.82 / unidad
Ver hoja de datos →ATMEGA4808-MFR Valores máximos y características eléctricas
| Core Processor | AVR (megaAVR 0-series) |
| Core Size | 8-Bit |
| Frecuencia de reloj máxima | 20 MHz |
| Flash Memory Size | 48 KB (24K x 16) |
| SRAM Size | 6 KB |
| EEPROM Size | 256 bytes |
| Encapsulado | 32-VFQFN (5x5 mm) |
| Tipo de montaje | Surface Mount |
| ADC Resolution | 10-bit |
| Special Feature | Functional Safety (FuSa) qualified variant |
| Interface Types | USART, SPI, I2C (TWI) |
| Programming Interface | UPDI (single-wire) |
| Hardware Multiplier | Yes |
Configuración de pines de ATMEGA4808-MFR
| Pin 1 | VDD — Power supply |
| Pin 2 | GND — Ground |
| Pin 3 | PA0 — GPIO / UPDI (programming interface) |
| Pin 4 | PA1 — GPIO |
| Pin 5 | PA2 — GPIO |
| Pin 6 | PA3 — GPIO |
| Pin 7 | PA4 — GPIO |
| Pin 8 | PA5 — GPIO |
| Pin 9 | PA6 — GPIO |
| Pin 10 | PA7 — GPIO |
| Pin 11 | PB0 — GPIO |
| Pin 12 | PB1 — GPIO |
| Pin 13 | PB2 — GPIO |
| Pin 14 | PB3 — GPIO |
| Pin 15 | PB4 — GPIO |
| Pin 16 | PB5 — GPIO |
| Pin 17 | PC0 — GPIO |
| Pin 18 | PC1 — GPIO |
| Pin 19 | PC2 — GPIO |
| Pin 20 | PC3 — GPIO |
| Pin 21 | PC4 — GPIO |
| Pin 22 | PC5 — GPIO |
| Pin 23 | PC6 — GPIO |
| Pin 24 | PC7 — GPIO |
| Pin 25 | PD0 — GPIO |
| Pin 26 | PD1 — GPIO |
| Pin 27 | PD2 — GPIO |
| Pin 28 | PD3 — GPIO |
| Pin 29 | PD4 — GPIO |
| Pin 30 | PD5 — GPIO |
| Pin 31 | PD6 — GPIO |
| Pin 32 | PD7 — GPIO |
Aplicaciones típicas
ATMEGA4808-MFR es adecuado para 6 aplicacións: Industrial Control and Automation, Capacitive Touch User Interfaces, IoT Sensor Endpoints, Home Appliances and White Goods, Motor Control Auxiliary Logic, Arduino-compatible Prototyping.
Industrial Control and Automation
The ATMEGA4808-MFR fits industrial control nodes where its FuSa qualification and 20 MHz AVR core with hardware multiplier support deterministic control loops. The 48 KB Flash accommodates Modbus or CAN-framed application code, while 6 KB SRAM buffers sensor history and communication stacks. In a typical node, USARTs link to RS-485 transceivers and the 10-bit ADC samples 0-10 V conditioned inputs; the CCL (configurable custom logic) offloads gate functions from software, cutting interrupt latency. The 32-VFQFN 5x5 package suits compact DIN-rail I/O modules, and the FuSa documentation package eases IEC 61508-oriented compliance work.
Recomendado
Capacitive Touch User Interfaces
The megaAVR 0-series integrates a Peripheral Touch Controller (PTC), letting the ATMEGA4808-MFR implement self- or mutual-capacitance touch buttons and sliders directly, without a dedicated touch IC. The 20 MHz core runs Microchip's touch library alongside application logic, and the 10-bit ADC supports haptic feedback thresholds or ambient-light-adaptive LED backlighting. With 48 KB Flash, a touch UI plus application firmware fits comfortably; the 32-pin VFQFN offers enough GPIO to drive up to dozens of touch channels and LED indicators, making it common in appliance panels, thermostats, and white-goods controls where ESD robustness and low BOM count matter.
Recomendado
IoT Sensor Endpoints
For battery-powered IoT sensor endpoints, the ATMEGA4808-MFR combines an efficient AVR core with sleep modes that reduce average current between sensor reads. The 10-bit ADC digitizes analog sensors, USART/SPI/TWI interfaces connect radio modules such as LoRa or Sub-GHz transceivers, and 256 bytes of EEPROM stores calibration constants across power cycles. The 48 KB Flash leaves room for future OTA-style bootloader expansion, and the single-wire UPDI interface simplifies in-field reprogramming via test pads. The compact 5x5 mm VFQFN suits space-constrained sensor pucks and telemetry dongles in smart-building and agriculture deployments.
Recomendado
Home Appliances and White Goods
Appliance control boards benefit from the ATMEGA4808-MFR's combination of FuSa documentation, MVIO-family robustness, and rich GPIO in a small 32-pin package. Typical designs use the 20 MHz core to sequence relays and triacs, the ADC with an NTC divider for temperature monitoring, and the PTC for touch panels, all on one MCU. The 48 KB Flash supports multi-language UI logic and fault-logging state machines, while 6 KB SRAM holds button-debounce and menu buffers. The single-wire UPDI interface enables factory programming through a single test point, reducing assembly cost in high-volume appliance production.
Recomendado
Motor Control Auxiliary Logic
In motor-driven systems, the ATMEGA4808-MFR frequently serves as an auxiliary controller handling user interface, safety interlocks, and communication while a dedicated motor-control MCU or driver handles the power stage. The 20 MHz AVR core with hardware multiplier executes PID-based supervisory logic, the 10-bit ADC reads current-sense amplifiers for over-current detection, and CCL can gate PWM signals in hardware for fast fault reaction. The FuSa qualification of the -MFR variant is valuable when the auxiliary controller participates in the safety function of drives, hoists, or pumps requiring documented reliability evidence.
Recomendado
Arduino-compatible Prototyping
The ATMEGA4808 is fully supported by the community MegaCoreX Arduino core, which covers ATmega4809/4808/3209/3208/1609/1608/809/808 devices. Designers can prototype on a Nano-style 4808 board and migrate directly to the ATMEGA4808-MFR on production hardware with the same footprint and pinout. The 20 MHz core, 48 KB Flash, and 6 KB SRAM give substantially more headroom than an ATmega328P-based Uno, while UPDI programming works with low-cost programmers. This makes the part attractive for maker products, test jigs, and small-batch instruments that need a smooth path from sketch to PCB.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ATMEGA4808-MFR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ATMEGA3208-MF | ATMEGA1608-MF | ATMEGA808-MF | ATMEGA4808-MF |
|---|---|---|---|---|---|
| Package | 32-VFQFN (5x5) | 32-VFQFN (5x5) - same | 32-VFQFN (5x5) - same | 32-VFQFN (5x5) - same | 32-VFQFN (5x5) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 48 KB (24K x 16) | 32 KB | 16 KB | 8 KB | 48 KB |
| SRAM | 6 KB | 4 KB | 2 KB | 1 KB | 6 KB |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Functional Safety (FuSa) | Yes (FuSa variant) | No (standard) | No (standard) | No (standard) | No (standard) |
| Programming Interface | UPDI (single-wire) | UPDI (single-wire) | UPDI (single-wire) | UPDI (single-wire) | UPDI (single-wire) |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 128 bytes | 256 bytes |
Diferenciadores clave
- Functional Safety (FuSa) qualification (frente a ATMEGA4808-MF)
- Largest memory in the 32-pin 0-series family (frente a ATMEGA3208-MF)
- Same footprint across the whole family for memory right-sizing (frente a ATMEGA808-MF)
Notas de diseño
Reserve access to PA0 for UPDI programming on every PCB. The megaAVR 0-series programs and debugs over a single-wire UPDI interface, so a 3-pad test point (VDD, GND, PA0) enables in-circuit reprogramming withoutbed-of-nails fixtures. Do not load PA0 heavily; a series resistor (e.g., 330 ohm) between the UPDI header and PA0 lets an external programmer override a weak pull-down while leaving normal GPIO use intact. Legacy ISP programmers and ATmega328P-style bootloaders are NOT compatible with the 0-series UPDI interface.
Decouple each VDD pin with a 100 nF ceramic capacitor placed within 2 mm of the pin, plus one bulk 4.7-10 uF capacitor near the MCU. The megaAVR 0-series datasheet recommends low-ESR decoupling to support the internal regulator and 20 MHz core. If the 10-bit ADC is used for precision measurements, add an RC filter (e.g., 100 ohm + 100 nF) on analog inputs and keep the analog ground return path away from relay or triac switching currents to protect the ADC's effective number of bits.
Do not assume ATmega328P pinout familiarity carries over: the 0-series renames ports, remaps peripherals, and uses UPDI instead of ISP. Verify the datasheet pin configuration section for the 32-VFQFN before schematic capture, since PA0 doubling as UPDI conflicts with some legacy designs that use PA0 as a reset or UART pin. Also confirm that your toolchain and programmer support the FuSa variant part number when generating production programming files.
Información de cumplimiento
Compliance status not stated in the retrieved web data; verify against Microchip's official product page and environmental datasheet before export-controlled production use.
