ATMEGA809-MUR - 8KB AVR MCU 20MHz VQFN-48 | Microchip
MPN: ATMEGA809-MUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.86 | $2.86 |
| 10 | $2.62 | $26.20 |
| 100 | $2.53 | $253.00 |
| 500 | $2.35 | $1,175.00 |
| 1,000 | $2.2 | $2,200.00 |
ATMEGA809-MUR Overview
A microcontroller (MCU) is a single-chip computer that combines a processor core, memory, and peripherals on one die, forming the lowest layer of the embedded-systems hierarchy: MCU -> embedded processor -> computing system. The megaAVR 0 family succeeds the classic ATmega line, adding Core Independent Peripherals (CIPs) that run without CPU intervention, improving real-time determinism and reducing firmware complexity.
Key differentiating features include the hardware multiplier in the AVR RISC core, the Event System for peripheral-to-peripheral signaling without CPU load, and Functional Safety (FuSa) documentation support for IEC 61508 and ISO 26262 oriented designs. Intelligent analog comprises the 10-bit ADC and analog comparators, while flexible timers, USARTs, SPI, and TWI (I2C) interfaces cover most connectivity needs.
Technically, the AVR 8-bit RISC Harvard architecture executes most instructions in a single cycle, delivering up to 20 MIPS at 20 MHz. The MUR ordering code denotes the 48-pin VQFN-EP (6x6) package in Tape and Reel packing; single-cycle multiply and rich interrupt structure suit both control and light signal-processing tasks.
Typical applications include industrial automation nodes, IoT sensor endpoints, motor control assistants, consumer appliance control, and functional-safety-adjacent monitoring circuits where 8 KB of code space, low power modes, and CIP autonomy are sufficient.
Design consideration: choose the smallest Flash variant (this 8 KB part) only after confirming code growth headroom; the pin-compatible ATmega1609/3209/4809 allow migration without PCB changes.
This page synthesizes distributor pricing, pin-compatible family alternatives, and design guidance not consolidated in the manufacturer datasheet.
Drop-in alternatives for ATMEGA809-MUR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA1609-MUR
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA3209-MUR
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA4809-MUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.92 / Unit
View Datasheet →ATMEGA809-MUR Maximum Ratings & Electrical Characteristics
| Core Processor | AVR 8-bit RISC with hardware multiplier |
| Core Size | 8-bit |
| Speed | 20 MHz |
| Flash Memory | 8 KB (8K x 8) |
| SRAM | 1 KB |
| EEPROM | 256 bytes |
| Supply Voltage Range | 1.8 V to 5.5 V |
| ADC Resolution | 10-bit |
| Number of I/O | 41 |
| Operating Temperature | -40 C to +85 C |
| Package | 48-VQFN (6x6 mm) with exposed pad |
| Mounting Type | Surface Mount |
| Series | megaAVR 0 (Functional Safety / FuSa) |
| Peripherals | Event System, Core Independent Peripherals, brown-out detect, POR, WDT |
| Connectivity | USART, SPI, TWI (I2C) |
| RoHS Status | Compliant |
| Packaging | Tape & Reel (R suffix) |
ATMEGA809-MUR 48-vqfn (6x6 mm) with exposed pad Pin Configuration Guide
Pin configuration for ATMEGA809-MUR (48-vqfn (6x6 mm) with 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 ATMEGA809-MUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA809-MUR is suitable for 6 applications: Industrial Automation Nodes, IoT Sensor Endpoints, Consumer Appliance Control, Motor Control Assist, Human Interface Devices, Functional-Safety-Adjacent Monitoring.
Industrial Automation Nodes
The ATMEGA809-MUR fits industrial control nodes because its -40 C to +85 C grade, 1.8 V to 5.5 V supply tolerance, and Core Independent Peripherals keep sensor loops and actuator timing deterministic even if firmware stalls. Typical role: acquisition and control front-end reading 10-bit ADC channels from analog sensors, dispatching events via the Event System to timers and comparators without CPU load. Running at 20 MHz from a 5 V rail with USART/SPI/TWI links to PLC backbones, it delivers 20 MIPS-class throughput; its FuSa product-line documentation further eases safety-oriented process adoption in factory equipment.
Recommended
IoT Sensor Endpoints
For battery-powered IoT sensor endpoints, the ATMEGA809-MUR combines low-voltage operation down to 1.8 V with low-power sleep modes and a CIP architecture that wakes only when peripherals raise events. A typical endpoint samples a sensor through the 10-bit ADC, formats data over USART or TWI (I2C) to a radio module, and returns to sleep. With 8 KB Flash, compact firmware including lightweight protocol handling fits without an RTOS. The 48-pin VQFN-EP (6x6 mm) keeps board area small, while the exposed pad aids grounding and thermal stability in sealed enclosures.
Recommended
Consumer Appliance Control
Appliance control boards need low cost, wide supply tolerance, and robust I/O - all matched by the ATMEGA809-MUR. Its 41 I/O lines drive keypads, LEDs, relays, and stepper or fan controls, while analog comparators and the 10-bit ADC monitor temperatures and mains-derived signals. The hardware multiplier accelerates scaling math for sensor linearization and PID loops at 20 MHz. RoHS compliance and active lifecycle status simplify long-term BOM management for high-volume consumer production, and the pin-compatible 1609/3209/4809 family provides a no-respin upgrade path if firmware features expand late in the program.
Recommended
Motor Control Assist
In low-complexity motor control, the ATMEGA809-MUR generates PWM via its flexible 16-bit timers while the Event System routes comparator trip events to timer fault inputs in hardware - critical for overcurrent protection latency independent of software. The 10-bit ADC samples current shunts and back-EMF for sensorless or sensored commutation assistance in fans, pumps, and small blowers. Operating from a 5 V rail at 20 MHz with a hardware multiplier, it executes control-loop math comfortably within 8 KB Flash for single-motor applications. The VQFN-EP package's exposed pad provides a low-impedance ground reference for switching-noise immunity.
Recommended
Human Interface Devices
Keyboards, control panels, and knob-based interfaces benefit from the ATMEGA809-MUR's 41 I/O lines, capacitive-touch-capable peripherals, and fast interrupt response. Scanning a matrix, driving segment LCDs or LED matrices, and communicating over TWI or USART all fit in 8 KB Flash with a simple state-machine architecture; the 20 MHz single-cycle AVR core yields responsive sub-millisecond debounce and scan timing. Its 1.8 V floor supports battery handhelds, while the 5.5 V ceiling covers USB-bus-powered desktop devices. The compact 6x6 mm VQFN suits slim product enclosures without sacrificing pin count.
Recommended
Functional-Safety-Adjacent Monitoring
Because the megaAVR 0 series is a Microchip Functional Safety (FuSa) product line, the ATMEGA809-MUR suits supervisory and monitoring roles in larger safety architectures - watchdog supervision, window comparator monitoring of critical voltages via analog comparators, and independent heartbeat channels implemented with Core Independent Peripherals. CIP autonomy means protection functions continue if the CPU hangs, supporting layered-defense arguments in IEC 61508-oriented projects. Designers should obtain Microchip's official safety manual for the family and follow the documented development flow; the 8 KB part is ideal where monitoring code is small and certification traceability matters.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA809-MUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA1609-MUR | ATMEGA3209-MUR | ATMEGA4809-MUR |
|---|---|---|---|---|
| Package | 48-VQFN (6x6 mm) EP | 48-VQFN (6x6 mm) EP - same | 48-VQFN (6x6 mm) EP - same | 48-VQFN (6x6 mm) EP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 8 KB | 16 KB | 32 KB | 32 KB |
| SRAM | 1 KB | 2 KB | 4 KB | 4 KB |
| EEPROM | 256 bytes | 256 bytes | 512 bytes | 512 bytes |
| Max CPU Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| I/O Count | 41 | 41 | 41 | 41 |
Key Differentiators
- Lowest-cost entry point of the 48-pin megaAVR 0 family (vs ATMEGA4809-MUR)
- Core Independent Peripherals with hardware Event System (vs ATMEGA1609-MUR)
- Functional Safety (FuSa) product-line documentation (vs ATMEGA3209-MUR)
Design Notes
Decouple both VDD pin pairs with 100 nF ceramic capacitors placed within 2 mm of pins 1/16/34 and their adjacent GND pins, plus one bulk 4.7 uF to 10 uF capacitor near the supply entry. Because the part operates from 1.8 V to 5.5 V, verify brown-out detector (BOD) thresholds are configured in fuse/FP settings to match the actual rail - a 2.7 V BOD setting on a 1.8 V design will hold the MCU in reset. Enable BOD in continuous or sampled mode per the datasheet to protect EEPROM writes during brown-outs.
Solder the exposed pad of the VQFN-48 to a grounded copper pour with an array of thermal vias; this anchors the die pad for mechanical reliability and provides the low-impedance ground return the ADC needs for its best noise performance. For rework, note that VQFN-EP parts are harder to reflow by hand - specify a stencil aperture design for the pad per IPC-recommended practice and consider x-ray or AOI inspection on first articles. Keep the UPDI pin routed to a test point for field programming.
Plan code-size headroom before committing to the 8 KB part: C code with floating-point math and printf consumes Flash quickly, and the hardware multiplier helps but does not eliminate library overhead. If there is any chance of protocol stacks or future features, design in the ATMEGA1609/3209/4809 as BOM-compatible alternates on the same footprint. Also, the megaAVR 0-series is programmed via UPDI, not the legacy ISP of older ATmega parts - legacy programmers will not work.
Compliance Information
RoHS compliance and lead-free status stated in JLCPCB listing for ATMEGA809-MUR. REACH, halogen-free, and conflict-minerals declarations should be obtained from Microchip's product compliance portal.
