ATMEGA3208-XUR - 8-bit AVR MCU 20MHz 32KB Flash 28-SSOP | Microchip
MPN: ATMEGA3208-XUR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.42 | $1.42 |
| 10 | $1.28 | $12.80 |
| 100 | $1.09 | $109.00 |
| 500 | $0.94 | $470.00 |
| 1,000 | $0.82 | $820.00 |
ATMEGA3208-XUR Overview
An 8-bit microcontroller (MCU) integrates a processor core, program memory, data memory, and peripherals onto a single chip, forming the lowest tier of the embedded control hierarchy: MCU -> embedded processor -> system-on-chip. The megaAVR 0-series belongs to Microchip's AVR family, widely used in industrial automation, home appliances, and IoT sensor nodes where deterministic 8-bit control is preferred over more complex 32-bit cores.
Key features include the AVR RISC core with single-cycle instruction execution and a hardware multiplier, up to 20 MHz clock operation, Core Independent Peripherals (CIPs), and an Event System that routes peripheral signals without CPU intervention. The device supports multiple sleep modes and a peripheral clock gating scheme for low-power battery-operated designs. Intelligent analog peripherals include a 10-bit ADC and analog comparators, reducing external component count.
The megaAVR 0-series architecture separates data and program buses for faster instruction throughput, and the unified peripheral architecture means firmware knowledge scales across Flash sizes from 8 KB to 48 KB within the family (ATmega808/1608/3208/4808 and the 40/48-pin 3209/4809 variants). The 28-pin SSOP package exposes up to 22 general-purpose I/O lines with configurable pull-ups and drive strength.
Typical applications include industrial control panels, motor control subsystems, consumer appliances, capacitive-touch user interfaces, and sensor nodes in IoT networks. The XUR suffix denotes the industrial temperature grade (-40C to +105C operating range) in tape-and-reel packaging.
Design consideration: the SSOP-28 footprint differs from the 32-pin TQFP of the ATmega3209; select the -XU SSOP variant when a 28-pin board layout must be preserved across Flash-size migrations.
This page synthesizes distributor pricing, verified drop-in alternatives, comparison data, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATMEGA3208-XUR 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 ATMEGA3208-XUR (same form factor and footprint) β differing in Core Processor, Flash Memory, Operating Temperature, Package, Peripherals.
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Request AlternativesATMEGA3208-XUR 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, Functional Safety (FuSa) |
| Package | 28-SSOP (SSOP-28, 208mil) |
| Operating Temperature | -40C to +105C (industrial grade, X suffix) |
| Mounting Type | Surface Mount |
| Peripherals | Core Independent Peripherals (CIP), Event System |
| ADC Resolution | 10-bit |
ATMEGA3208-XUR 28-ssop (ssop-28, 208mil) Pin Configuration Guide
Pin configuration for ATMEGA3208-XUR (28-ssop (ssop-28, 208mil) 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 ATMEGA3208-XUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA3208-XUR is suitable for 6 applications: Industrial Control Panels, Motor Control Subsystems, Consumer Appliances, IoT Sensor Nodes, Capacitive Touch User Interfaces, Power Supply and Battery Charger Supervision.
Industrial Control Panels
The ATMEGA3208-XUR fits industrial control panels because its Functional Safety (FuSa) classification, industrial -40C to +105C temperature grade, and 32 KB Flash provide headroom for protocol handling and control state machines. The AVR core executes at 20 MHz with single-cycle instructions, giving deterministic timing for relay sequencing and button debounce logic. Core Independent Peripherals allow timers and comparators to keep running during watchdog servicing, and the Event System chains peripheral signals without CPU load. In a panel controller, the MCU reads discrete inputs, drives outputs through the GPIO with configurable pull-ups, and reports status over UART. Trade-off: 4 KB SRAM limits complex buffering, so designs requiring large communication buffers should step up to the ATmega4808 in the same SSOP-28 footprint.
Recommended
Motor Control Subsystems
For small motor control tasks such as fan, pump, or actuator drivers, the ATMEGA3208-XUR offers the hardware multiplier for fast duty-cycle and speed calculations plus timer peripherals suited to PWM generation. The 20 MHz AVR core with single-cycle multiply executes PID control loops comfortably within PWM periods at audio-range switching frequencies. The Event System can trigger ADC sampling synchronized to PWM edges without software latency, improving current-sampling accuracy. The 10-bit ADC resolves current or position feedback adequately for cost-sensitive drives. Use the SSOP-28 package for compact gate-driver boards; pair with an external MOSFET driver. Design consideration: place the MCU ground reference at a quiet analog point and route PWM outputs away from the ADC input traces to prevent switching noise coupling into feedback measurements.
Recommended
Consumer Appliances
Home appliances such as coffee machines, washing-machine user panels, and small HVAC controllers are classic 8-bit MCU territory, and the ATMEGA3208-XUR addresses them directly: 20 MHz performance, 32 KB Flash for menu/state-machine logic, and 256 bytes EEPROM for storing user settings through power cycles. The XU industrial temperature grade survives appliance interior temperatures better than commercial-grade parts. Core Independent Peripherals manage touch sensing, buzzer tones, and LED multiplexing in hardware, freeing CPU time for the user-interface state machine. Tape-and-reel (R suffix) packaging supports automated high-volume assembly lines. The SSOP-28 body is hand-solderable for repair and prototyping, unlike fine-pitch QFN alternatives, reducing service costs in appliance production.
Recommended
IoT Sensor Nodes
The ATMEGA3208-XUR suits battery-powered IoT sensor nodes through the megaAVR 0-series low-power architecture: multiple sleep modes, peripheral clock gating, and the ability of the Event System and analog comparators to operate while the CPU sleeps. A typical node wakes the 20 MHz core periodically, reads a sensor over I2C or SPI, scales the value with the hardware multiplier, and transmits via an external radio module. The 32 KB Flash accommodates a sensor driver, filtering code, and a lightweight protocol stack, while 4 KB SRAM handles packet buffers. Trade-off: at 3.3 V logic levels verify peripheral speed derating at the low end of the supply range per the datasheet frequency-versus-voltage curves. The SSOP-28 footprint offers 22-class GPIO counts sufficient for sensor, status LED, and radio control lines.
Recommended
Capacitive Touch User Interfaces
Microchip's megaAVR 0-series is marketed with 'intelligent analog' for touch applications, and the ATMEGA3208-XUR's ADC and analog peripherals support capacitive-touch key detection using charge-transfer or ADC-based methods. The 20 MHz core applies filtering and debounce algorithms with margin, while the Event System links timer and comparator events in hardware, keeping scan timing jitter-free without CPU intervention. A 28-pin SSOP-28 layout provides enough GPIO for a 8-12 key touch pad plus LED indicators and a UART link to the main appliance controller. The 32 KB Flash leaves room for tuning tables and self-calibration routines; the 256-byte EEPROM stores per-unit sensitivity calibration through field service. Firmware frameworks and touch libraries from Microchip are reusable across the whole 0-series, shortening development time.
Recommended
Power Supply and Battery Charger Supervision
In AC-DC adapters, chargers, and embedded power supplies, the ATMEGA3208-XUR acts as a supervision MCU managing start-up sequencing, fault logging, and communication with a host. The 10-bit ADC monitors output voltage and current sense signals, while analog comparators provide hardware over-current trip thresholds that react faster than software loops. Timers generate PWM for a small buck or flyback stage in low-cost designs, with the hardware multiplier simplifying compensation calculations. The -40C to +105C grade tolerates enclosure heat near power stages. Safety-relevant fault handling benefits from the FuSa device classification. The SSOP-28 through-hole-compatible lead pitch eases in-circuit test access during production, and 32 KB Flash holds a communication bootloader for field firmware updates over the serial link.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA3208-XUR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA4808-XUR | ATMEGA1608-XUR | ATMEGA808-XUR | ATMEGA3208-XFR |
|---|---|---|---|---|---|
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB (16K x 16) | 48 KB | 16 KB | 8 KB | 32 KB |
| SRAM | 4 KB | 6 KB (per 0-series family range) | 2 KB | 1 KB | 4 KB |
| Max Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Core | AVR 8-bit with hardware multiplier | AVR 8-bit (megaAVR 0-series) | AVR 8-bit (megaAVR 0-series) | AVR 8-bit (megaAVR 0-series) | AVR 8-bit (megaAVR 0-series) |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
Key Differentiators
- FuSa (Functional Safety) classification in a low-cost 8-bit MCU (vs ATMEGA1608-XUR)
- SSOP-28 hand-assembly-friendly package (vs ATMEGA3208-MFR)
- Flash-size migration without PCB change (vs ATMEGA4808-XUR)
Design Notes
The SSOP-28 (208 mil body) has a 0.65 mm lead pitch. For reflow assembly, confirm the footprint matches the Microchip package drawing in datasheet DS40002174C; for hand prototyping, a 0.65 mm iron tip or drag-soldering with solder wick works well. Avoid routing high-current or switching traces directly under the package body - the SSOP leadframe couples switching noise into the die more than QFN parts with exposed pads. Provide a solid ground plane on layer 2 and place 100 nF decoupling capacitors within 3 mm of the VDD pin pair.
Do not confuse the -XUR (SSOP) with the -MFR (VQFN) suffix when ordering - Findchips explicitly lists these as separate parts and they are NOT footprint-compatible. Also verify Flash-size headroom before committing to the 32 KB part: firmware with a bootloader plus protocol stack can approach the limit, and the pin-compatible ATMEGA4808-XUR upgrade path costs nothing on the PCB. Finally, the megaAVR 0-series pinout differs from classic megaAVR (ATmega328P) parts - legacy schematic blocks cannot be reused without pin re-mapping.
Estimated: a 20 MHz AVR 0-series core with all peripherals active typically draws in the low-milliamp range (consult datasheet DS40002174C for exact active-mode current vs. voltage), so a simple 3.3 V or 5 V LDO generally suffices for the MCU rail. For battery nodes, exploit the sleep modes: gate peripheral clocks and use the Event System so the CPU sleeps between samples. Add a 10 uF bulk capacitor near the MCU and a separate 100 nF ceramic at each supply pin. Verify the frequency-versus-voltage operating curve before running 20 MHz at the low end of the supply range.
Compliance Information
Compliance details were not present in the retrieved Verified Web Data; verify RoHS/REACH status on the Microchip product page or distributor environmental data before release.
