ATMEGA4808-MUR - 8-Bit AVR MCU 20MHz 48KB Flash QFN-32 | Microchip
MPN: ATMEGA4808-MUR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.68 | $1.68 |
| 10 | $1.55 | $15.50 |
| 100 | $1.42 | $142.00 |
| 500 | $1.3 | $650.00 |
| 1,000 | $1.22 | $1,220.00 |
ATMEGA4808-MUR Overview
A microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and configurable peripherals such as timers, serial interfaces, and analog-to-digital converters. Microcontrollers are the foundation of embedded systems, sitting at the lowest level of the computing hierarchy (microcontroller -> embedded processor -> application processor) and powering everything from home appliances to industrial automation nodes.
Key features of the ATMEGA4808 include a wide supply range of 1.8 V to 5.5 V, a 12-channel 10-bit ADC, and an internal oscillator that removes the need for an external crystal in most designs. The AVR core executes most instructions in a single cycle, and the integrated hardware multiplier accelerates math-intensive firmware. The megaAVR 0-series event system allows peripherals to communicate directly without CPU intervention, reducing latency and power consumption.
Technical depth: the device uses the latest AVR core with Harvard architecture and single-cycle I/O access. Peripherals include multiple TCA/TCB/TCE timers, USARTs, SPI, and TWI (I2C) interfaces, plus a programmable custom logic (configurable logic cell) block. Self-programmable Flash with a 10,000-cycle endurance rating supports firmware updates in the field. Brown-out reset, watchdog timer, and power-on reset provide robust operation in noisy environments.
Typical applications include industrial control nodes, functional-safety-rated consumer appliances, motor controlθΎ ε© logic, sensor hubs, and legacy ATmega328P design upgrades where more Flash and modern peripherals are needed.
Design consideration: because the MCU operates to 5.5 V, designers can power it directly from 5 V USB or industrial rails; at 5 V the ADC reference options and peripheral timing margins are best. Keep VDD/GND decoupling capacitors close to the exposed pad.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet, with pricing verified as of 2026-09-18.
Drop-in alternatives for ATMEGA4808-MUR 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 ATMEGA4808-MUR (same form factor and footprint) β differing in Core Processor, Package, Series.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA4808-MFR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA4808-MNT
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA3208-MUR
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$1.24 / Unit
View Datasheet βATMEGA1608-MUR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA808-MUR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA4808-MUR Maximum Ratings & Electrical Characteristics
| Core Processor | AVR 8-bit (megaAVR 0-series) |
| Core Size | 8-Bit |
| Speed | 20 MHz |
| Flash Memory Size | 48 KB (24K x 16) |
| SRAM Size | 6 KB (6K x 8) |
| EEPROM Size | 256 bytes |
| Supply Voltage Range | 1.8 V to 5.5 V |
| ADC Resolution | 10-bit |
| ADC Channels | 12 |
| Oscillator Type | Internal |
| Package | 32-VQFN (5x5 mm) exposed pad / 32-VFQFN |
| Mounting Type | Surface Mount |
| Series | megaAVR 0, Functional Safety (FuSa) |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Connectivity | I2C (TWI), SPI, USART |
| Pin Count | 32 |
| RoHS Status | Compliant |
ATMEGA4808-MUR Pin Configuration
| Pin 1 | VDD β Power supply (1.8 V to 5.5 V) |
| Pin 2 | GND β Ground |
| Pin 3 | PA0 β Port A bit 0 (TOSC1/XTAL1) |
| Pin 4 | PA1 β Port A bit 1 (TOSC2/XTAL2) |
| Pin 5 | PA2 β Port A bit 2 |
| Pin 6 | PA3 β Port A bit 3 |
| Pin 7 | PA4 β Port A bit 4 |
| Pin 8 | PA5 β Port A bit 5 |
| Pin 9 | PA6 β Port A bit 6 |
| Pin 10 | PA7 β Port A bit 7 |
| Pin 11 | PB0 β Port B bit 0 |
| Pin 12 | PB1 β Port B bit 1 |
| Pin 13 | PB2 β Port B bit 2 |
| Pin 14 | PB3 β Port B bit 3 |
| Pin 15 | PB4 β Port B bit 4 |
| Pin 16 | PB5 β Port B bit 5 |
| Pin 17 | PC0 β Port C bit 0 |
| Pin 18 | PC1 β Port C bit 1 |
| Pin 19 | PC2 β Port C bit 2 |
| Pin 20 | PC3 β Port C bit 3 |
| Pin 21 | PC4 β Port C bit 4 |
| Pin 22 | PC5 β Port C bit 5 |
| Pin 23 | PD0 β Port D bit 0 |
| Pin 24 | PD1 β Port D bit 1 |
| Pin 25 | PD2 β Port D bit 2 |
| Pin 26 | PD3 β Port D bit 3 |
| Pin 27 | PD4 β Port D bit 4 |
| Pin 28 | PD5 β Port D bit 5 |
| Pin 29 | PD6 β Port D bit 6 |
| Pin 30 | PD7 β Port D bit 7 (UPDI, fuse-configurable) |
| Pin 31 | GND β Ground |
| Pin 32 | VDD β Power supply (1.8 V to 5.5 V) |
Typical Applications
ATMEGA4808-MUR is suitable for 6 applications: Industrial Control Nodes, Functional Safety Consumer Appliances, ATmega328P Design Upgrades, Sensor Hubs and Data Acquisition, Motor Control Support Logic, Battery-Powered and IoT End Nodes.
Industrial Control Nodes
The ATMEGA4808-MUR fits industrial control and automation nodes because its 1.8 V to 5.5 V supply range tolerates noisy 5 V rails, and its brown-out reset, watchdog timer, and power-on reset peripherals deliver robust fault recovery in electrically harsh factory environments. The 20 MHz AVR core with hardware multiplier handles PID loops and protocol processing, while 48 KB Flash leaves room for Modbus/CAN-adjacent firmware stacks and field-updatable code via self-programming. Used as the node controller between sensors and actuators, the 12-channel 10-bit ADC digitizes analog sensor inputs directly, and the event system routes peripheral signals without CPU latency - a quantified benefit for deterministic I/O scanning in PLC-style remote I/O modules.
Recommended
Functional Safety Consumer Appliances
The ATMEGA4808-MUR belongs to Microchip's Functional Safety (FuSa) qualified megaAVR 0-series, making it a strong candidate for appliance controllers where safety-related supervision logic must be documented and audited - for example cooktop over-temperature monitoring, dishwasher door-lock interlocks, and washing machine motor supervision. The 48 KB Flash accommodates both application code and safety-check routines, while the internal oscillator removes external timing components that could become single points of failure. Peripherals such as the watchdog timer and brown-out detection are part of the safety story; used alongside the configurable custom-logic block, the device can implement independent hardware-level protection paths without consuming the main CPU budget, reducing software complexity and certification effort.
Recommended
ATmega328P Design Upgrades
Designers maintaining ATmega328P-based products choose the ATMEGA4808-MUR when they need more memory and modern peripherals in a compact 5x5 mm QFN. Per Hackster.io analysis, the ATmega4808 offers 48 KB Flash versus 32 KB, 12 ADC channels versus 6, and the modern event system and TCA/TCB timer architecture - while keeping the same 5 V-friendly supply range and Arduino development path via MegaCoreX. Note the footprint is NOT pin-compatible with the ATmega328P TQFP/QFN, so this is a board-level upgrade rather than a drop-in swap; the benefit is a future-proof platform with UPDI single-wire debugging that lowers field-service and manufacturing-test cost compared with legacy ISP programming.
Recommended
Sensor Hubs and Data Acquisition
With a 12-channel 10-bit ADC and I2C/SPI/USART interfaces, the ATMEGA4808-MUR works well as a sensor hub aggregating analog and digital sensors. The wide 1.8 V to 5.5 V operating range lets it sit directly on battery or 5 V USB rails, and the internal oscillator eliminates the crystal BOM in non-timing-critical logging applications. Firmware running at 20 MHz with the hardware multiplier performs calibration math and filtering efficiently, while 48 KB Flash stores look-up tables, compensation curves, and logging buffers in the 6 KB SRAM. Typical deployments include environmental monitoring nodes, HVAC zone controllers, and portable instrumentation where the ADC's multiple channels digitize several sensors simultaneously and the USART streams results upstream.
Recommended
Motor Control Support Logic
The ATMEGA4808-MUR serves as supervisory and interface logic around motor drivers: its TCA/TCB timers generate PWM with hardware resolution, the 10-bit ADC reads back shunt-derived current and voltage feedback across up to 12 channels, and the custom-logic block can gate PWM outputs in hardware for fast fault shutdown. Operating to 5.5 V, it interfaces directly with 5 V gate-driver logic without level shifting. The 20 MHz core with hardware multiplier executes commutation and speed-loop math, while the event system links ADC conversions to timer triggers with minimal CPU load - a quantified latency benefit in closed-loop control. Typical pairings include brushed DC, stepper, and small BLDC fan/pump applications in appliances and industrial equipment.
Recommended
Battery-Powered and IoT End Nodes
For battery-powered IoT end nodes, the ATMEGA4808-MUR combines a 1.8 V minimum supply with an internal oscillator, so it keeps running as a lithium cell discharges without an external clock part. MegaAVR 0-series sleep modes and peripheral event routing let the CPU stay parked while the ADC and timers operate under event control, extending battery life in duty-cycled designs. The 48 KB Flash supports OTA-style field updates via self-programming and the USART/SPI link to a radio module, while 256 B EEPROM stores calibration and node-address data that must survive power loss. Typical use cases include smart-home sensors, metering probes, and asset tags that report periodically over sub-GHz or BLE companion radios.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA4808-MUR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA4808-MFR | ATMEGA3208-MUR | ATMEGA1608-MUR | ATMEGA808-MUR |
|---|---|---|---|---|---|
| Package | 32-VQFN (5x5 mm) exposed pad | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 48 KB (24K x 16) | 48 KB | 32 KB | 16 KB | 8 KB |
| SRAM | 6 KB | 6 KB | 4 KB | 2 KB | 1 KB |
| Max CPU Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| ADC | 12-ch, 10-bit | 12-ch, 10-bit | 12-ch, 10-bit | 12-ch, 10-bit | 12-ch, 10-bit |
| Supply 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 |
| Temperature Qualification | Standard range (per -MUR suffix) | Industrial | Standard range | Standard range | Standard range |
Key Differentiators
- Largest Flash in the 32-pin megaAVR 0-series (vs ATMEGA3208-MUR)
- Functional Safety (FuSa) family qualification (vs ATMEGA808-MUR)
- Standard-range cost optimization (vs ATMEGA4808-MFR)
Design Notes
Place 100 nF ceramic decoupling capacitors at both VDD pins (pin 1 and pin 32) as close to the package as possible, and add a bulk 4.7 uF to 10 uF capacitor near the supply entry. The 32-VQFN exposed pad should be soldered to a grounded copper pad array on the PCB - even though the pad is primarily mechanical/thermal here, it improves ground integrity and EMI performance. Keep the UPDI trace (PD7) accessible via a test point or tagged connector for single-wire field programming with MPLAB SNAP or a serial-UPDI adapter.
The ATMEGA4808 is NOT pin-compatible with the ATmega328P despite its similar role - do not attempt a footprint swap without PCB revision. On megaAVR 0-series parts, the UPDI function shares a GPIO pin that is fuse-configurable; if the fuse is set to GPIO mode, re-enabling UPDI requires a 12 V high-voltage programmer, so design-in a fuse-default UPDI path. Also verify ADC reference selection: at VDD below the chosen internal reference voltage, conversions clip - scale the input network accordingly.
Estimated: megaAVR 0-series active current is on the order of a few mA at 20 MHz and 5 V (exact figure per Microchip datasheet electrical characteristics tables); sleep-mode current drops to the uA range. Size the supply for the active budget plus peripheral loads (ADC reference, pull-ups, LED indicators) rather than sleep numbers. For battery designs, exploit the event system to run ADC sampling from timer triggers while the CPU sleeps, and confirm the brown-out detector threshold matches your battery cutoff voltage to prevent corrupted Flash writes at end-of-discharge.
For I2C (TWI) and SPI buses, keep trace lengths short and match pull-up values to bus capacitance; at 5 V the megaAVR 0-series VIH thresholds permit standard 4.7 k-ohm pull-ups on I2C at 100 kHz. When using the internal oscillator for USART communication above 115200 baud, verify the oscillator error budget against the datasheet tolerance or enable auto-baud; for precise timing-critical UART links, an external crystal on PA0/PA1 (TOSC/XTAL pins) remains an option despite the internal oscillator being the default configuration.
Compliance Information
RoHS compliance per distributor listings (DigiKey/LCSC) for the 32-VQFN package. AEC-Q100 is not applicable (consumer/industrial AVR family). REACH and conflict minerals status not stated in provided data.
