ATMEGA8-16MUR - 8KB Flash 16MHz AVR MCU | Microchip
MPN: ATMEGA8-16MUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.36 | $3.36 |
| 10 | $3.36 | $33.60 |
| 100 | $3.36 | $336.00 |
| 500 | $3.36 | $1,680.00 |
| 1,000 | $3.36 | $3,360.00 |
ATMEGA8-16MUR Overview
An 8-bit microcontroller integrates a CPU core, program memory, data memory, and peripherals such as timers, UART, SPI, and ADC on a single silicon die, forming the lowest tier of the embedded processor hierarchy (MCU -> embedded processor -> SoC). Microchip's AVR architecture executes most of its 130 powerful instructions in a single clock cycle, delivering up to 16 MIPS at 16 MHz.
Key features include the advanced RISC AVR core with 32 general-purpose working registers, a 6 or 8 channel 10-bit ADC, in-system self-programmable Flash for field firmware updates, and industrial temperature grade (IND) qualification per the Mouser listing. The exposed pad improves thermal and ground performance in the compact 5x5 mm footprint.
Technical depth: the ATmega8 Harvard architecture separates program and data buses, allowing simultaneous fetch and execution. Two-wire Interface (I2C-compatible), USART, and SPI serial interfaces cover most connectivity needs, while three PWM channels support motor and LED control. Data retention of Flash and EEPROM is specified for 20 years at 85C per Atmel/Microchip documentation.
Typical applications include industrial control nodes, consumer appliances, sensor interfaces using the 10-bit ADC, and hobby/embedded products requiring 5V operation at 4.5 V to 5.5 V supply.
Design consideration: program the fuse bits correctly for clock source selection; the device ships calibrated for internal RC oscillator, but external crystal on PB6/PB7 is required for full 16 MHz accuracy tolerance.
This page synthesizes distributor pricing, drop-in alternatives, pinout data, and design notes not found on any single distributor page.
Drop-in alternatives for ATMEGA8-16MUR — 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 ATMEGA8-16MUR (same form factor and footprint) — differing in Package, ADC Resolution, Communication Interfaces, Supply Voltage Range, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA8A-MUR
✅ Drop-In✓ In Stock
$0.7 / Unit
View Datasheet →ATMEGA88-15MT
✅ Drop-In✓ In Stock
$0.93 / Unit
View Datasheet →ATMEGA48PA-MUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.98 / Unit
View Datasheet →ATMEGA168PA-MUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.75 / Unit
View Datasheet →ATMEGA328P-MUR
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA8-16MUR Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR 8-bit RISC |
| Core Size | 8-bit |
| Maximum Clock Frequency | 16 MHz |
| Program Memory Size | 8 KB (4K x 16) Flash |
| EEPROM Size | 512 B |
| SRAM Size | 1 KB |
| Supply Voltage Range | 4.5 V to 5.5 V |
| I/O Ports | 23 |
| ADC Resolution | 10-bit, 6 or 8 channel |
| Execution Performance | Up to 16 MIPS at 16 MHz |
| Instruction Set | 130 powerful instructions, most single-cycle |
| Package | 32-VQFN (5x5 mm) Exposed Pad (MLF-32) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (Industrial) |
| Lifecycle Status | Active |
| Programming Interface | ICSP (In-Circuit Serial Programming) |
ATMEGA8-16MUR Pin Configuration
| Pin 1 | PD3 — Port D, bit 3 (GPIO / INT1) |
| Pin 2 | PD4 — Port D, bit 4 (GPIO / XCK/T0) |
| Pin 3 | GND — Ground |
| Pin 4 | VCC — Digital supply voltage |
| Pin 5 | GND — Ground |
| Pin 6 | VCC — Digital supply voltage |
| Pin 7 | PB6/XTAL1/TOSC1 — Port B bit 6 / crystal oscillator input / timer oscillator |
| Pin 8 | PB7/XTAL2/TOSC2 — Port B bit 7 / crystal oscillator output / timer oscillator |
| Pin 9 | PD5 — Port D, bit 5 (GPIO / T1 / OC1A) |
| Pin 10 | PD6 — Port D, bit 6 (GPIO / AIN0) |
| Pin 11 | PD7 — Port D, bit 7 (GPIO / AIN1) |
| Pin 12 | PB0 — Port B, bit 0 (GPIO / ICP1) |
| Pin 13 | PB1 — Port B, bit 1 (GPIO / OC1A) |
| Pin 14 | PB2 — Port B, bit 2 (GPIO / SS / OC1B) |
| Pin 15 | PB3/MOSI/OC2 — Port B bit 3 / SPI master output / PWM output 2 |
| Pin 16 | PB4/MISO — Port B bit 4 / SPI master input |
| Pin 17 | PB5/SCK — Port B bit 5 / SPI clock |
| Pin 18 | AVCC — ADC supply voltage |
| Pin 19 | ADC6 — ADC input channel 6 |
| Pin 20 | AREF — ADC analog reference |
| Pin 21 | GND — Ground |
| Pin 22 | ADC7 — ADC input channel 7 |
| Pin 23 | PC0/ADC0 — Port C bit 0 / ADC channel 0 |
| Pin 24 | PC1/ADC1 — Port C bit 1 / ADC channel 1 |
| Pin 25 | PC2/ADC2 — Port C bit 2 / ADC channel 2 |
| Pin 26 | PC3/ADC3 — Port C bit 3 / ADC channel 3 |
| Pin 27 | PC4/ADC4/SDA — Port C bit 4 / ADC channel 4 / TWI data |
| Pin 28 | PC5/ADC5/SCL — Port C bit 5 / ADC channel 5 / TWI clock |
| Pin 29 | PC6/RESET — Port C bit 6 / Reset input (active low) |
| Pin 30 | PD0/RXD — Port D bit 0 / USART receive |
| Pin 31 | PD1/TXD — Port D bit 1 / USART transmit |
| Pin 32 | PD2/INT0 — Port D bit 2 / External interrupt 0 |
Typical Applications
ATMEGA8-16MUR is suitable for 6 applications: Industrial Control Nodes, Sensor Interfaces with 10-bit ADC, Motor and PWM Control, Serial Communication Gateways, Consumer Appliance Control, Hobby and Educational Embedded Platforms.
Industrial Control Nodes
The ATMEGA8-16MUR fits industrial control nodes because its 5 V supply (4.5-5.5 V) directly matches legacy industrial logic levels, and its 23 I/O lines with 20 mA drive capability interface relays, optocouplers, and 5 V sensors without level shifting. The 16 MHz clock provides 16 MIPS, sufficient for polling loops and simple PID control, while the 10-bit ADC (6/8 channels) reads potentiometers, thermistors, and 0-5 V transducer signals with 4.88 mV resolution. In this role the MCU typically runs a master loop reading the ADC every few milliseconds, communicating over USART or TWI to a supervisory PLC. The industrial -40C to +85C grade ensures reliability on factory floors, and the exposed-pad VQFN package improves ground integrity in electrically noisy environments. Its ICSP interface enables field firmware updates without desoldering.
Recommended
Sensor Interfaces with 10-bit ADC
The ATMEGA8-16MUR is well matched to analog sensor acquisition because its integrated 10-bit successive-approximation ADC offers 6 channels on ports PC0-PC5 plus 2 dedicated channels ADC6/ADC7, delivering 4.88 mV LSB at a 5 V reference. Differential mode with selectable gain measures low-level signals such as bridge sensors and thermocouple conditioners. The AREF pin (pin 20) accepts an external precision reference for better absolute accuracy than the default AVCC reference, and AVCC on pin 18 should be filtered with an LC network per the datasheet for clean analog performance. With 16 MIPS of headroom, the part performs oversampling and averaging to gain effective resolution, then streams results over SPI or TWI to a host. Its 1 KB SRAM supports modest buffering and filtering without external memory.
Recommended
Motor and PWM Control
The ATMEGA8-16MUR suits small motor control applications through its three hardware PWM channels (OC1A, OC1B, OC2) driven by 16-bit Timer/Counter1 and 8-bit Timer/Counter2. At 16 MHz, Timer1 supports phase-correct and fast PWM modes with resolutions up to 16 bits, enabling smooth DC motor speed control and servo positioning at standard 50 Hz frames. The 23 GPIO lines provide direction, enable, and brake signals to H-bridge drivers, and the 10-bit ADC reads back current-sense amplifiers for closed-loop torque limiting. The 5 V rail matches common gate-driver logic thresholds, and the 16 MIPS core can execute a fast inner current loop alongside commutation logic. Input capture on ICP pin simplifies tachometer frequency measurement for closed-loop speed regulation.
Recommended
Serial Communication Gateways
The ATMEGA8-16MUR works well as a protocol gateway because it provides three independent hardware serial interfaces: a USART (pin 2 TX? - PD1 TXD, PD0 RXD), an SPI master/slave (PB3-PB5), and a TWI two-wire interface on PC4/PC5 (I2C-compatible). A typical topology bridges a slow TWI sensor bus to a UART uplink: the 16 MHz clock generates accurate baud rates up to 1 Mbps in double-speed mode with low error percentages across standard rates such as 9600 and 115200 baud per the datasheet baud-rate tables. The 512 B EEPROM stores node addresses and configuration that survive power cycles, while the 8 KB Flash holds dual protocol stacks with room to spare. The exposed-pad package grounds well for EMI-sensitive RS-485 environments.
Recommended
Consumer Appliance Control
In appliance front-panel and control-board designs, the ATMEGA8-16MUR offers the classic cost/performance point: 8 KB Flash holds display scanning, key decoding, and buzzer logic comfortably; 23 I/O pins drive a multiplexed 7-segment or LED matrix directly at up to 20 mA per pin. The 10-bit ADC reads NTC thermistors for temperature cutoffs and user potentiometers, and Timer2's asynchronous mode can run a 32.768 kHz watch crystal for accurate timekeeping during main-clock sleep, keeping average current low. The industrial -40C to +85C rating tolerates kitchen and HVAC environments, and the compact 5x5 mm VQFN saves PCB area in crowded control boards. ICSP programming (via two I/O pins plus reset) supports in-circuit firmware updates on the assembled appliance board.
Recommended
Hobby and Educational Embedded Platforms
The ATMEGA8-16MUR remains a staple of hobby and educational platforms because it is ICSP-programmable with inexpensive tools such as the MPLAB SNAP or classic AVR ISP, using just two I/O pins and the reset line per Microchip documentation. At 16 MHz it executes 16 MIPS, fast enough to teach interrupts, timers, PWM, ADC sampling, and all three serial protocols without hitting performance limits. The 5 V operation makes breadboard use straightforward with USB-serial adapters, and the 8 KB Flash accommodates Arduino-style bootloader code with several KB remaining for the user sketch. The VQFN package requires care in hand soldering, so educational kits typically adapt it via a QFN-to-DIP carrier board; the identical pinout to ATmega48/88/168/328 lets one carrier design serve the whole upgrade path.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA8-16MUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA8A-MUR | ATMEGA88-15MT | ATMEGA328P-MUR |
|---|---|---|---|---|
| Package | 32-VQFN (5x5 mm) MLF-32 | 32-VQFN (5x5 mm) MLF-32 - same | 32-QFN MLF-32 - same footprint | 32-VQFN MLF-32 - same footprint |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 8 KB | 8 KB | 8 KB | 32 KB |
| Max Clock Frequency | 16 MHz | 16 MHz | 15 MHz | 20 MHz |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 1.8 V to 5.5 V (full range) | 1.8 V to 5.5 V |
| EEPROM | 512 B | 512 B | 1 KB | 1 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 2 KB |
| Pin Compatibility with ATmega8 | Native | Identical - true drop-in | Pin-compatible per AVR094, firmware changes needed | Pin-compatible, firmware changes needed |
Key Differentiators
- True drop-in continuity (vs ATMEGA88-15MT)
- Highest clock in the ATmega8 family at 5 V (vs ATMEGA88-15MT)
- Higher integration than low-end AVR at same footprint (vs ATMEGA48PA-MUR)
Design Notes
Decouple both VCC pins (4 and 6) and AVCC (pin 18) individually. Use 100 nF ceramic capacitors placed within 2 mm of each supply pin, plus one 4.7-10 uF bulk capacitor near the device. AVCC must be connected to VCC even if the ADC is unused; for clean analog performance, feed AVCC through an LC filter (10 uH inductor with 100 nF) as recommended in the ATmega8 datasheet. The exposed pad must be soldered to ground - it is the primary ground return for the MLF-32 package.
Clock fuse misconfiguration is the most common ATmega8 failure mode. Setting fuses for external crystal when none is fitted (or vice versa) can brick the device except via parallel high-voltage programming. The -16 speed grade only guarantees 16 MHz at 4.5-5.5 V; do not attempt 16 MHz at 3.3 V - use ATmega48PA/88PA/328P for wide-voltage designs. Also remember PC6/RESET is active-low with an internal pull-up only when configured; add an external 10 k pull-up for reliable in-circuit programming.
For the 5x5 mm VQFN (0.5 mm pitch), use a standard QFN-32 land pattern with the center pad tied to a via-stitched ground plane (minimum 4-5 vias under the pad). For ICSP access, route PB5/SCK, PB4/MISO, PB3/MOSI, and PC6/RESET to a 2x3 header. Keep the crystal on PB6/PB7 within 10 mm of the pins with short ground-guard traces, and keep SPI/TWI lines away from the ADC input traces to preserve 10-bit ADC accuracy.
Compliance Information
RoHS status not explicitly stated in the retrieved distributor data; verify on the official Microchip product page. AEC-Q100 not claimed in the retrieved data.
