ATMEGA3208-MUR - 8-bit AVR MCU 20MHz 32KB QFN-32 | Microchip
MPN: ATMEGA3208-MUR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.88 | $1.88 |
| 10 | $1.7 | $17.00 |
| 100 | $1.52 | $152.00 |
| 500 | $1.38 | $690.00 |
| 1,000 | $1.24 | $1,240.00 |
ATMEGA3208-MUR Overview
An 8-bit AVR microcontroller is a single-chip computer built around the Harvard-architecture AVR RISC core, executing most instructions in a single clock cycle. Within the power-management IC hierarchy, it sits as the complete embedded processing element of a system, combining CPU, memory, and peripherals such as USARTs, SPI, TWI (I2C), timers, an ADC, and analog comparators on one die.
Key features include the 20 MHz maximum clock frequency, 32 KB in-system-programmable Flash with optional boot section, a 10-bit ADC, and Functional Safety (FuSa) support per DigiKey categorization, making the family suitable for IEC 61508-oriented designs. The megaAVR 0-series also brings event system inter-peripheral signaling and a configurable custom logic peripheral (CCL).
Technically, the ATmega3208 uses the latest AVR core with a two-stage pipeline and hardware multiplier, delivering efficient C code execution. Microchip MegaAVR Studio and MPLAB X IDE with MCC (MPLAB Code Configurator) support code generation and debugging via the UPDI single-pin interface on PA0, reducing debug pin count versus legacy JTAG parts.
Typical applications include industrial control and automation nodes, motor control auxiliaries, consumer appliances, and IoT sensor endpoints that need 5V-tolerant robust I/O and rich serial connectivity in a compact 5x5 mm footprint.
A key design consideration is supply voltage: this is a 5V-class MCU (up to 5.5 V per the 0-series family), so ensure level shifting when interfacing 3.3V peripherals, and place 100 nF decoupling capacitors on every VDD/GND pin pair.
This page synthesizes distributor pricing, drop-in family alternatives, pinout, and practical design notes not found in the manufacturer datasheet, with pricing as of 2026-09-17.
Drop-in alternatives for ATMEGA3208-MUR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA4808-MU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA1608-MU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA808-MU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA3208-MUR Maximum Ratings & Electrical Characteristics
| Core Processor | AVR 8-bit with hardware multiplier |
| Core Size | 8-bit |
| Speed | 20 MHz |
| Flash Memory | 32 KB (16K x 16) |
| SRAM | 4 KB |
| EEPROM | 256 bytes |
| Series | megaAVR 0-series |
| ADC Resolution | 10-bit |
| Package | 32-VQFN (5x5 mm) Exposed Pad |
| Mounting Type | Surface Mount |
| Functional Safety | FuSa supported (per DigiKey categorization) |
| Debug Interface | UPDI (single-pin, PA0) |
ATMEGA3208-MUR Pin Configuration
| Pin 1 | VDD β Power supply |
| Pin 2 | GND β Ground |
| Pin 3 | PA4 β GPIO / ADC / alternate peripheral function |
| Pin 4 | PA5 β GPIO / ADC / alternate peripheral function |
| Pin 5 | PA6 β GPIO / ADC / alternate peripheral function |
| Pin 6 | PA7 β GPIO / ADC / alternate peripheral function |
| Pin 7 | PB5 β GPIO / alternate peripheral function |
| Pin 8 | PB4 β GPIO / alternate peripheral function |
| Pin 9 | PB3 β GPIO / alternate peripheral function |
| Pin 10 | PB2 β GPIO / alternate peripheral function |
| Pin 11 | PB1 β GPIO / alternate peripheral function |
| Pin 12 | PB0 β GPIO / alternate peripheral function |
| Pin 13 | PC5 β GPIO / alternate peripheral function |
| Pin 14 | PC4 β GPIO / alternate peripheral function |
| Pin 15 | PC3 β GPIO / alternate peripheral function |
| Pin 16 | PC2 β GPIO / alternate peripheral function |
| Pin 17 | PC1 β GPIO / alternate peripheral function |
| Pin 18 | PC0 β GPIO / alternate peripheral function |
| Pin 19 | PD7 β GPIO / alternate peripheral function |
| Pin 20 | PD6 β GPIO / alternate peripheral function |
| Pin 21 | PD5 β GPIO / alternate peripheral function |
| Pin 22 | PD4 β GPIO / alternate peripheral function |
| Pin 23 | PD3 β GPIO / alternate peripheral function |
| Pin 24 | PD2 β GPIO / alternate peripheral function |
| Pin 25 | PD1 β GPIO / alternate peripheral function |
| Pin 26 | PD0 β GPIO / alternate peripheral function |
| Pin 27 | PA3 β GPIO / ADC / alternate peripheral function |
| Pin 28 | PA2 β GPIO / ADC / alternate peripheral function |
| Pin 29 | PA1 β GPIO / ADC / alternate peripheral function |
| Pin 30 | PA0 β GPIO / UPDI debug-programming interface |
| Pin 31 | GND β Ground |
| Pin 32 | VDD β Power supply |
Typical Applications
ATMEGA3208-MUR is suitable for 6 applications: Industrial Control and Automation, IoT Sensor Endpoints, Consumer Appliances, Motor Control Auxiliary Logic, LED Lighting Control, Prototyping and Embedded Education.
Industrial Control and Automation
The ATMEGA3208-MUR fits industrial control nodes because its 5V-class I/O tolerates noisy factory-floor environments, its 20 MHz AVR core with hardware multiplier executes PID loops efficiently, and its 10-bit ADC reads sensor channels without an external converter. In a typical node, the MCU drives relays and reads limit switches via ports PA-PD, communicates with a PLC over USART or TWI, and uses the event system for deterministic peripheral signaling. The FuSa (Functional Safety) support of the megaAVR 0-series adds documentation value for machinery-safety assessments, and the 32-pin 5x5 mm VQFN conserves control-board area.
Recommended
IoT Sensor Endpoints
For battery- and line-powered IoT endpoints, the ATMEGA3208-MUR offers integrated 10-bit ADC, TWI and SPI masters for digital sensors, and single-pin UPDI programming that simplifies manufacturing fixtures. Its 32 KB Flash holds protocol stacks and local data buffering in 4 KB SRAM, while the megaAVR 0-series sleep modes reduce standby current between wake-up events. The 5x5 mm QFN suits compact sensor puck PCBs, and 5V operation lets the MCU drive LEDs and optocouplers directly without level-shifting. Communicating over USART to a wireless module, the device handles preprocessing and thresholding locally.
Recommended
Consumer Appliances
White goods and small appliances benefit from the ATMEGA3208-MUR's 5V robust I/O, 32 KB Flash for touch/menu logic, and hardware multiplier for sensor linearization math. Typical use: the MCU scans a capacitive-touch or mechanical keypad on ports PB/PC, controls triac-based heater or motor drives via timer outputs, and reads NTC sensors through the 10-bit ADC with ratiometric measurement. The megaAVR 0-series configurable custom logic (CCL) peripheral can gate timer outputs in hardware, reducing interrupt latency for zero-crossing dimmer control, while the 32-pin QFN keeps controller PCB cost low.
Recommended
Motor Control Auxiliary Logic
As auxiliary logic alongside a dedicated motor controller, the ATMEGA3208-MUR supervises sequencing, monitors fault lines through its 10-bit ADC and analog comparators, and generates PWM at up to 20 MHz core-derived resolution using the TCA/TCB timers. The hardware multiplier accelerates speed-ramp calculations, and the event system routes comparator outputs to timer capture without CPU intervention for fast fault shutdown. Its 5V I/O interfaces directly with gate-driver logic levels, and 32 KB Flash holds bootloader plus diagnostic firmware with room for field upgrades via the boot section.
Recommended
LED Lighting Control
Dimming and color-mixing luminaires use the ATMEGA3208-MUR because its 20 MHz core and TCA timers produce multi-channel PWM with 16-bit or higher effective resolution via dithering, while the CCL can combine timer outputs for phase-correct drive. The MCU reads dimmer commands over DALI-style USART links or TWI from a touch panel, stores calibration in 256 bytes of EEPROM, and drives MOSFET gate drivers directly from 5V GPIO. The 5x5 mm VQFN fits driver PCB cutouts, and the megaAVR 0-series sleep modes cut standby draw below regulatory limits when the lamp is off.
Recommended
Prototyping and Embedded Education
The ATMEGA3208-MUR is a strong teaching and prototyping platform: the open-source MegaCoreX Arduino core supports it alongside ATmega4809/3209/1608/808, giving students modern peripherals (event system, CCL, UPDI) with the familiar Arduino toolchain. The single-pin UPDI interface lowers debugger cost to a basic programmer such as SNAP, and the 32 KB Flash / 4 KB SRAM comfortably hosts sensor, serial, and display exercises. Availability in TQFP (ATMEGA3208-AU) allows hand-soldered breakout boards, while the QFN -MUR version mirrors production packaging for final designs.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA3208-MUR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA4808-MU | ATMEGA1608-MU | ATMEGA808-MU |
|---|---|---|---|---|
| Package | 32-VQFN (5x5 mm) | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Speed | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz |
| Flash Memory | 32 KB | 48 KB | 16 KB | 8 KB |
| SRAM | 4 KB | 6 KB | 2 KB | 1 KB |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Pin Compatibility | Reference (32-pin VQFN) | Pin-to-pin compatible | Pin-to-pin compatible | Pin-to-pin compatible |
Key Differentiators
- Balanced memory point of the megaAVR 0-series 32-pin family (vs ATMEGA808-MU)
- Cost-optimized versus the flagship of the same footprint (vs ATMEGA4808-MU)
- Functional Safety (FuSa) program support (vs ATMEGA1608-MU)
Design Notes
The 32-pin VQFN (5x5 mm) has an exposed thermal pad that must be soldered to a grounded copper area - it is the primary ground connection, not just thermal relief. Use an array of vias (typically 4-9) under the pad to the ground plane for reliable reflow and low ground impedance. Place 100 nF ceramic decoupling capacitors within 2 mm of each VDD/GND pin pair (corners of the package) to handle the fast AVR core edges.
PA0 is the UPDI pin by default. If your application uses PA0 as GPIO, the device can become difficult to reprogram; reserve UPDI access with a series resistor and test point, or use the UPDI fuse configuration carefully. Estimated note: also verify RSTDISBL-type configuration pin behavior in the megaAVR 0-series fuse settings before locking firmware, since recovery requires a 12V-class UPDI high-voltage pulse on some AVR parts.
This is a 5V-class MCU family; when interfacing 3.3V peripherals, check VIH margins - at 5V VDD, a 3.3V logic high may be marginal for 0.7xVDD threshold inputs. Use level shifters or run TWI with appropriate bus-voltage matching. The megaAVR 0-series features a programmable internal LDO for the core; keep the decoupling on the internal regulator output per datasheet reference design to avoid core-rail noise during flash writes.
Compliance Information
Compliance data was not present in the retrieved web data; consult the official Microchip product page environmental datasheet for RoHS/REACH status.
