ATMEGA808-MUR - 8-bit AVR MCU 20MHz 8KB Flash | Microchip
MPN: ATMEGA808-MUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.52 | $0.52 |
| 10 | $0.47 | $4.70 |
| 100 | $0.42 | $42.00 |
| 500 | $0.39 | $195.00 |
| 1,000 | $0.372 | $372.00 |
ATMEGA808-MUR Overview
A microcontroller (MCU) is a single-chip embedded computer integrating a processor core, program memory, data memory, and peripherals such as timers, communication interfaces, and analog-to-digital converters. Within the power-management hierarchy of embedded design, an 8-bit MCU like the ATmega808 sits at the low-to-mid complexity tier, ideal for deterministic, low-cost control tasks where a 32-bit ARM core would be unnecessary.
Key features include the AVR RISC processor executing most instructions in a single cycle for up to 20 MIPS at 20 MHz, 10-bit ADC capability (per LCSC product data), operation from -40C to +85C, and 5V operation characteristic of the megaAVR 0 series. The series uses Microchip's latest Core Independent Peripherals (CIPs), allowing hardware tasks such as PWM generation and communication to run without CPU intervention, reducing firmware complexity and improving real-time determinism.
Architecturally, the ATmega808/809/1608/1609 family shares the ATmega809 family datasheet (document DS40002172C), with Flash organized as 16-bit words since AVR instructions are 16 or 32 bits wide. On-chip In-System Programming (ISP) allows reprogramming without removal from the board. The event system interconnects peripherals directly, enabling autonomous signal routing between timers, ADC, and custom logic peripherals.
Typical applications include industrial automation control boards, home appliance and consumer electronics control, and motor control or lighting systems where 5V noise immunity and single-cycle I/O access are valuable. The 32-VQFN (5x5) exposed-pad package suits space-constrained, thermally demanding PCBs.
Design consideration: the 8 KB Flash and 1 KB SRAM budget firmware size carefully; use -O2 compilation and the tiny printf variants. The exposed pad should be soldered to a ground plane for thermal and EMC performance.
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.
Drop-in alternatives for ATMEGA808-MUR — 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 ATMEGA808-MUR (same form factor and footprint) — differing in ADC Resolution, Package, Series, Core Processor, Flash Memory.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA4808-MUR
✅ Drop-In✓ In Stock
$1.22 / Unit
View Datasheet →ATMEGA1608-MUR
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA3208-MUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.24 / Unit
View Datasheet →ATMEGA808-MUR Maximum Ratings & Electrical Characteristics
| Core | AVR 8-bit |
| Series | megaAVR 0, Functional Safety (FuSa) |
| Max Operating Frequency | 20 MHz |
| Flash Memory | 8 KB (8K x 8) |
| SRAM | 1 KB |
| EEPROM | 256 bytes |
| ADC Resolution | 10 bit |
| Operating Temperature | -40C to +85C |
| Package | 32-VQFN (5x5 mm) Exposed Pad |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Product Status | Active |
ATMEGA808-MUR 32-vqfn (5x5 mm) exposed pad Pin Configuration Guide
Pin configuration for ATMEGA808-MUR (32-vqfn (5x5 mm) exposed pad 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 ATMEGA808-MUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA808-MUR is suitable for 6 applications: Industrial Automation Control, Home Appliance Control, Motor Control and Lighting, IoT Sensor Nodes, Consumer Electronics Subsystems, Functional Safety Applications.
Industrial Automation Control
The ATMEGA808-MUR fits industrial control nodes thanks to its -40C to +85C rating, 5V noise-immune I/O, and Core Independent Peripherals that run PWM, capture, and communication autonomously even if firmware stalls. In a PLC I/O module, the 20 MHz AVR core polls digital inputs and drives relay outputs with single-cycle port access, while the 10-bit ADC conditions 0-10V sensor channels via a divider. The 8 KB Flash accommodates Modbus RTU slaves and state machines; when logic grows, the pin-compatible ATMEGA1608/3208-MUR swap in without a respin. The FuSa family qualification supports functional-safety documentation needs in factory equipment.
Recommended
Home Appliance Control
Appliance main boards need low cost, robust I/O, and reliable operation over line-voltage noise, all strengths of the ATMEGA808-MUR. Its 5V operation tolerates the transients typical of relay-switched compressors and motors, and the hardware multiplier accelerates PID loops for temperature regulation via the 10-bit ADC reading NTC sensors. At roughly $0.37 in volume (LCSC, as of 2026-09-18), the BOM cost suits high-volume appliances. The 256-byte EEPROM stores calibration and cycle counters across power cycles. The 32-VQFN 5x5 footprint fits compact control PCBs behind front panels.
Recommended
Motor Control and Lighting
For fan, pump, and LED lighting control, the ATMEGA808-MUR generates multi-channel PWM through its Core Independent Peripherals without CPU loading, leaving the 20 MHz AVR core free for commutation and fault supervision. The 10-bit ADC samples current-sense shunts for overcurrent protection with sub-millisecond response when driven by the event system. Single-cycle GPIO enables precise triac phase-angle firing in dimming applications. The 8 KB Flash holds sensorless startup and protection routines; designs needing FOC should step up to the pin-compatible ATMEGA4808-MUR for code room.
Recommended
IoT Sensor Nodes
Wired and low-power IoT endpoints benefit from the ATMEGA808-MUR's low standby modes and Core Independent Peripherals that can sample the ADC and accumulate results while the CPU sleeps, extending battery life in sensor nodes. The 10-bit ADC digitizes humidity, pressure, or current sensors, and USART or SPI links to external radio modules. The 1 KB SRAM supports lightweight MQTT or CoAP payloads with careful buffer management. The 32-VQFN exposed pad bonds to the ground plane, improving RF layout hygiene when placed near 2.4 GHz or sub-GHz modules.
Recommended
Consumer Electronics Subsystems
In consumer products such as chargers, small displays, and remote controls, the ATMEGA808-MUR provides the right balance of cost and capability. At about $0.372 at volume (LCSC, as of 2026-09-18), it undercuts most 32-bit MCUs while offering hardware-multiplier math, 10-bit ADC for battery and temperature monitoring, and configurable I/O for buttons, LEDs, and buzzer drive. The 20 MHz clock gives ample headroom for debounce and UI state machines, and the 32-VQFN (5x5 mm) package suits space-limited handheld enclosures with standard SMT assembly.
Recommended
Functional Safety Applications
The megaAVR 0 family, including the ATMEGA808-MUR, is qualified for functional safety (FuSa), making it appropriate for safety-related control functions in industrial and medical equipment under IEC 61508-style development flows. Engineers can leverage Microchip's FuSa design support packages for the family when building SIL-rated logic, watchdog supervision, and diagnostic self-tests. The Core Independent Peripherals implement hardware-based monitoring (WDT, RTC, CCL logic) that continues operating independently of the CPU, supporting safety mechanisms. Design teams should obtain the official safety manual from Microchip for certification evidence.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA808-MUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA4808-MUR | ATMEGA1608-MUR | ATMEGA3208-MUR |
|---|---|---|---|---|
| Package | 32-VQFN (5x5 mm) Exposed Pad | 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 / Max Frequency | AVR 8-bit / 20 MHz | AVR 8-bit / 20 MHz | AVR 8-bit / 20 MHz | AVR 8-bit / 20 MHz |
| Flash Memory | 8 KB | 48 KB | 16 KB | 32 KB |
| SRAM | 1 KB | 6 KB | 2 KB | 4 KB |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Lowest cost in same footprint (vs ATMEGA4808-MUR)
- Functional safety qualification (vs ATMEGA1608-MUR)
- Upgrade path within one PCB (vs ATMEGA3208-MUR)
Design Notes
The 32-VQFN exposed pad must be soldered to a grounded thermal pad on the PCB. Define an array of thermal vias (typically 4-6, 0.3 mm diameter) under the pad to the ground plane to ensure reliable solder wetting and low-impedance grounding. Use 0.5 mm pitch QFN land patterns per standard stencil design, with solder paste coverage around 60-70% on the exposed pad to avoid voiding and component tombstoning during reflow.
Decouple each VDD pin with 100 nF ceramic capacitors placed within 2-3 mm of the pin, plus one bulk 4.7-10 uF capacitor near the supply entry. The megaAVR 0 series core operates from an internal regulator; keep the supply clean to preserve ADC accuracy on the 10-bit converter. Avoid routing switching-regulator traces under the device, and add a ferrite bead between noisy supply rails and the MCU VDD net in motor-control designs.
The 8 KB Flash fills quickly with floating-point libraries and protocol stacks; estimate code size early and reserve 20% headroom, or design the PCB for the pin-compatible ATMEGA1608/3208/4808-MUR from the start. Program via UPDI (single-wire) - older ISP programmers for classic AVRs do not work. Also, configure unused GPIO as inputs with pull-ups or outputs low rather than leaving floating, to reduce EMC susceptibility and quiescent leakage in battery designs.
Compliance Information
Verified web data did not include explicit compliance statements; obtain Material Declaration from Microchip product page for ATMEGA808.
