ATMEGA4808-AUR - 8-Bit AVR MCU 20MHz 48KB Flash | Microchip
MPN: ATMEGA4808-AUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.66 | $26.60 |
| 100 | $2.42 | $242.00 |
| 500 | $2.2 | $1,100.00 |
| 1,000 | $1.98 | $1,980.00 |
ATMEGA4808-AUR Overview
A microcontroller unit (MCU) integrates a processor core, memory, and peripherals on a single silicon die, forming the lowest level of the embedded-system hierarchy (system -> embedded computer -> MCU -> CPU core). The megaAVR 0-series represents Microchip's latest generation of the classic AVR architecture, adding modern peripherals while preserving AVR ease of use and the huge AVR developer ecosystem.
Key features include the AVR RISC core with a hardware multiplier executing most instructions in a single clock cycle, 48 KB of in-system-programmable Flash, 6 KB of SRAM for data and stacks, 256 bytes of EEPROM for non-volatile calibration and settings storage, and multiple serial peripherals (USART, SPI, TWI/I2C) plus 10-bit ADC and analog comparators. The device also carries Functional Safety (FuSa) support, easing IEC 61508-oriented development.
Technically, the megaAVR 0-series uses the latest AVR core with an enhanced event system, configurable custom logic (CLC), and low-power sleep modes, enabling deterministic real-time control while maintaining very low active and sleep current. The wide operating voltage supports both 3.3V and 5V systems.
Typical applications include industrial control and automation nodes, home appliances, motor-adjacent sensing and sequencing logic, and general-purpose embedded boards, including Arduino-compatible designs supported by the MegaCoreX community package.
Design consideration: the ATMEGA4808-AUR is programmed via the Unified Program and Debug Interface (UPDI), so plan a UPDI header in your PCB layout rather than legacy ISP headers used by older ATmega328 designs.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATMEGA4808-AUR — 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-AUR (same form factor and footprint) — differing in Series, Core Processor, Packaging, Programming Interface, SRAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA3208-AUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.94 / Unit
View Datasheet →ATMEGA1608-AUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.92 / Unit
View Datasheet →ATMEGA808-AUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.09 / Unit
View Datasheet →ATMEGA3208-AU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.59 / Unit
View Datasheet →ATMEGA4808-AU
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA4808-ANR
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA4808-AUR Maximum Ratings & Electrical Characteristics
| Core Processor | AVR (megaAVR 0-series), 8-bit RISC with hardware multiplier |
| Core Size | 8-bit |
| Maximum Clock Frequency | 20 MHz |
| Flash Memory Size | 48 KB (24K x 16) |
| SRAM Size | 6 KB |
| EEPROM Size | 256 bytes |
| Supply Voltage Range | 3.3 V / 5 V operation (per parametric listing) |
| Package | 32-TQFP (7x7 mm) |
| Mounting Type | Surface Mount |
| Series | megaAVR 0, Functional Safety (FuSa) |
| Programming Interface | UPDI (Unified Program and Debug Interface) |
| Peripherals | USART, SPI, TWI (I2C), 10-bit ADC, analog comparator, CLC, event system |
| Data Converters | 10-bit ADC |
| RoHS Status | Compliant |
| Packaging | Tape & Reel (AUR suffix) |
| Pin Count | 32 |
ATMEGA4808-AUR 32-tqfp (7x7 mm) Pin Configuration Guide
Pin configuration for ATMEGA4808-AUR (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-AUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA4808-AUR is suitable for 6 applications: Industrial Control and Automation Nodes, Home Appliances and White Goods, Arduino-Compatible Prototyping and Education, Sensor Hubs and IoT End Nodes, Motor Control Supervision and Sequencing, Battery-Powered Handheld Instruments.
Industrial Control and Automation Nodes
The ATMEGA4808-AUR fits industrial control nodes because its 20 MHz AVR core with hardware multiplier delivers deterministic single-cycle instruction execution, while 48 KB Flash and 6 KB SRAM accommodate Modbus or protocol stacks with headroom. Its Functional Safety (FuSa) categorization eases compliance workflows for IEC 61508-oriented equipment. In a typical node, the MCU reads 10-bit ADC channels from sensors, drives relays or actuators via GPIO, and exchanges data over USART or TWI/I2C to a gateway. The event system allows peripheral-to-peripheral signaling without CPU intervention, reducing jitter in real-time loops. Compared to a software-timed design, hardware CLC (configurable custom logic) can gate signals autonomously, improving response time and offloading the core.
Recommended
Home Appliances and White Goods
Appliance control boards benefit from the ATMEGA4808-AUR's combination of 3.3V/5V operation, robust AVR peripherals, and 256 bytes of EEPROM for storing user settings and calibration across power cycles. The 32-TQFP (7x7 mm) footprint suits cost-optimized two-layer or four-layer appliance PCBs, and the 20 MHz clock is sufficient for user interfaces, temperature regulation loops, and motor sequencing. The 10-bit ADC reads NTC thermistors and potentiometers, while USART links to display or communication modules. Sleep modes keep standby current low to satisfy energy-efficiency requirements. Designers should route the UPDI pad to a test point for factory programming. The wide availability and second-source flexibility within the megaAVR 0-series (808/1608/3208 in the same footprint) protects long appliance production lifetimes.
Recommended
Arduino-Compatible Prototyping and Education
The ATMEGA4808-AUR is a modern successor to the ATmega328 in Arduino-style boards, supported by the community MegaCoreX Arduino hardware package, which adds ATmega4808 board definitions and UPDI upload. It offers 48 KB Flash - 50% more than the ATmega328P - plus a hardware multiplier and richer peripherals at a comparable price point (about $2.42 at single quantities as of 2026-09-18). Educational and maker boards benefit from the 32-TQFP hand-solderable 0.8 mm pin pitch and the single-wire UPDI interface that needs only a low-cost programmer. Sketches using Serial, SPI, I2C, and analogRead port directly through MegaCoreX. Note that legacy ISP shields and bootloaders for ATmega328 do not apply; designs should include a dedicated UPDI header.
Recommended
Sensor Hubs and IoT End Nodes
As a sensor hub, the ATMEGA4808-AUR aggregates I2C/TWI sensors over its TWI peripheral and forwards pre-processed data via USART or SPI to a wireless module. The 6 KB SRAM comfortably holds ring buffers for multiple sensor streams, and the event system plus 10-bit ADC handles local analog channels without external converters. Its low-power sleep modes suit battery-powered end nodes that wake on interrupt, sample, transmit, and return to sleep. The hardware multiplier accelerates filtering math (fixed-point FIR/IIR) that 8-bit MCUs without multipliers handle slowly. Pricing around $2.42 (as of 2026-09-18) keeps the BOM tight for high-volume IoT products, and the FuSa-supported megaAVR 0-series simplifies quality documentation for commercial deployments.
Recommended
Motor Control Supervision and Sequencing
While dedicated motor drivers handle power stages, the ATMEGA4808-AUR excels as the supervisory MCU in motor-driven products: it sequences power rails, monitors current via the 10-bit ADC, and generates PWM gates using timer peripherals, with the CLC (configurable custom logic) providing hardware-level interlocks that react faster than firmware. The 20 MHz core with hardware multiplier executes commutation or speed-loop math comfortably for small BLDC and brushed-DC systems. The 48 KB Flash stores fault logs and multi-profile firmware. The megaAVR 0-series event system routes timer and comparator events without CPU latency, improving protection response. The 32-TQFP (7x7 mm) provides enough GPIO for hall sensors, limit switches, and an operator interface in a compact footprint.
Recommended
Battery-Powered Handheld Instruments
Handheld meters and test instruments use the ATMEGA4808-AUR for its balance of low sleep current, 3.3V/5V flexibility, and compute capability: the hardware multiplier supports calibration math, RMS computation, and linearization on 10-bit ADC readings. The 256-byte EEPROM stores factory calibration coefficients that survive battery replacement, and 48 KB Flash leaves room for multi-language UI strings and logging. The 32-TQFP (7x7 mm) keeps PCB area small for ergonomic enclosures, while sleep modes extend battery life between charges. The UPDI single-wire interface enables in-field firmware updates via a service jig. Compared to the ATmega328P, the richer peripheral set (event system, CLC) reduces external glue logic, shrinking BOM cost in portable designs.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA4808-AUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA3208-AUR | ATMEGA1608-AUR | ATMEGA808-AUR | ATMEGA4808-AU |
|---|---|---|---|---|---|
| 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 | 48 KB | 32 KB | 16 KB | 8 KB | 48 KB |
| SRAM | 6 KB | 4 KB | 2 KB | 1 KB | 6 KB |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 128 bytes | 256 bytes |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Core / Series | AVR megaAVR 0-series, FuSa | AVR megaAVR 0-series | AVR megaAVR 0-series | AVR megaAVR 0-series | AVR megaAVR 0-series, FuSa |
| Programming Interface | UPDI | UPDI | UPDI | UPDI | UPDI |
| Packaging (delivery) | Tape & Reel (AUR) | Tape & Reel | Tape & Reel | Tape & Reel | Tray |
Key Differentiators
- Largest Flash in the same 32-TQFP megaAVR 0-series footprint (vs ATMEGA3208-AUR)
- Functional Safety (FuSa) support (vs ATMEGA3208-AUR)
- Migration path from ATmega328P with modern peripherals (vs ATMEGA328PB-AUR)
Design Notes
Include a UPDI programming header (VDD, GND, UPDI) on every PCB using the ATMEGA4808-AUR. Unlike legacy ATmega328 designs that used a 6-pin ISP header, the megaAVR 0-series programs only through the single-wire UPDI interface (via PICkit 4, SNAP, Atmel-ICE, or compatible programmers). Omitting this header forces rework-level access for firmware updates. The 32-TQFP 0.8 mm pitch also permits an exposed pad-free layout, but maintain solid VDD/GND decoupling with 100 nF ceramic capacitors at each supply pin pair, placed within a few millimeters of the pins.
The ATMEGA4808-AUR supports 3.3V and 5V operation per its parametric listing, but per datasheet DS40002173 the megaAVR 0-series operates across the full range - verify your target clock against the operating-voltage/frequency graph in the datasheet if you plan to derate supply below nominal. Estimated: at 5V and 20 MHz, active current is typically in the several-mA range for AVR cores; in power-save sleep the current drops orders of magnitude - always validate with the datasheet electrical characteristics table and your own board measurements rather than relying on typical values.
Do not attempt to reuse ATmega328P/328PB pinout tables or ISP bootloaders on the ATMEGA4808: although both families use TQFP-32 packages, the megaAVR 0-series pin assignment and programming interface differ completely, and socket-level substitution will not function. Likewise, the ATmega4809 datasheet pin tables (40/48-pin) do not map to the 32-pin 4808 - always use the 4808 32-TQFP pinout table in DS40002173C. Finally, migrate EEPROM code to the new EEPROM peripheral API, as register-level access differs from classic AVRs.
Compliance Information
RoHS compliant per standard Microchip commercial AVR ordering-code practice; REACH/halogen-free/conflict-minerals declarations not present in provided web data - download certificates from Microchip product page.
