ATMEGA64L-8MQ - 8-Bit AVR MCU 64KB 8MHz 64-QFN | Microchip
MPN: ATMEGA64L-8MQ ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $10.46 | $10.46 |
| 10 | $9.9 | $99.00 |
| 25 | $9.58 | $239.50 |
| 100 | $8.68 | $868.00 |
| 500 | $8.3 | $4,150.00 |
| 1,000 | $7.95 | $7,950.00 |
ATMEGA64L-8MQ Overview
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, achieving throughput approaching one MIPS per MHz. Within the power-management hierarchy, the ATmega64 sits in the mid-range flash microcontroller family, bridging small ATmega8/16/32 parts and the ATmega128, and integrates CPU, memory, timers, ADC, UARTs, SPI, TWI and analog comparators on one die.
Key features include the AVR enhanced RISC core with 130 powerful instructions and 32 x 8 general-purpose working registers, fully static operation, in-system self-programmable flash, and an on-chip ADC that operates down to the extended-temperature industrial range. The low-voltage L variant is specified for 2.7V to 5.5V operation at up to 8 MHz, enabling single-supply battery-powered designs.
Architecturally, the single-cycle execution model lets designers optimize power consumption versus processing speed, since the same work can be completed at a lower clock frequency. Peripherals include two 8-bit timers, two 16-bit timers, two UARTs, an 8-channel 10-bit ADC, SPI and TWI interfaces.
Typical applications include industrial control and monitoring, battery-powered instrumentation, sensor hubs, and embedded communication nodes that need multiple UARTs.
Design note: Microchip lists this part as a mature product not recommended for new designs, replaced by the ATmega64A family - plan second-source or migration early.
This page adds distributor pricing, drop-in same-family alternatives, and selection guidance not found in the raw datasheet, with prices as of 2026-09-18.
Drop-in alternatives for ATMEGA64L-8MQ — 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 ATMEGA64L-8MQ (same form factor and footprint) — differing in Package, Core Architecture, Debug Interface, Operating Temperature, SRAM Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA64L-8AQ
✅ Drop-In✓ In Stock
$7.5 / Unit
View Datasheet →ATMEGA64A-MUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.42 / Unit
View Datasheet →ATMEGA64L-8MJ
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.31 / Unit
View Datasheet →ATMEGA644P-20MQ
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.48 / Unit
View Datasheet →ATMEGA649A-MU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.42 / Unit
View Datasheet →ATMEGA649P-MU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$3.91 / Unit
View Datasheet →ATMEGA64L-8MQ Maximum Ratings & Electrical Characteristics
| Core | AVR 8-bit RISC |
| Core Size | 8-Bit |
| Max Clock Frequency | 8 MHz |
| Flash Memory Size | 64KB (32K x 16) |
| SRAM Size | 4KB |
| EEPROM Size | 2KB |
| Supply Voltage Range | 2.7 V to 5.5 V |
| MIPS Throughput | up to 8 MIPS (approx. 1 MIPS/MHz) |
| Instruction Set | 130 powerful instructions, most single-cycle |
| General Purpose Registers | 32 x 8 |
| Package | 64-VFQFN (9x9 mm), exposed pad |
| Mounting Type | Surface Mount |
| Temperature Grade | Extended industrial |
| Number of Pins | 64 |
| Terminal Form | No-lead (QCCN) |
| RoHS / Green Status | GREEN, RoHS-compliant (Q suffix) |
| Packaging | Tape & Reel (R suffix) |
| Lifecycle | Mature product; not recommended for new designs; replaced by ATmega64A |
ATMEGA64L-8MQ 64-vfqfn (9x9 mm), exposed pad Pin Configuration Guide
Pin configuration for ATMEGA64L-8MQ (64-vfqfn (9x9 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 ATMEGA64L-8MQ.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA64L-8MQ is suitable for 6 applications: Industrial Control and Automation, Battery-Powered Instrumentation, Embedded Communication Nodes, Sensor Hubs and Data Acquisition, Consumer and Building Equipment, Legacy Production Continuity.
Industrial Control and Automation
The ATMEGA64L-8MQ fits industrial control nodes where deterministic single-cycle RISC execution, 64KB of flash for protocol and logic code, and an extended industrial temperature grade are required. Its dual UARTs support simultaneous Modbus RTU and local service links, while the 8-channel 10-bit ADC handles analog sensor inputs such as pressure, level, and temperature transmitters. Operating from 2.7V to 5.5V, it can run from a 5V industrial rail with full speed margin at 8 MHz. The no-lead VFQFN-64 package with exposed pad provides low thermal resistance and compact PCB footprint. Use the watchdog timer, brown-out detector, and in-system programmable flash for field-updatable firmware in installed equipment.
Recommended
Battery-Powered Instrumentation
With its L-variant 2.7V to 5.5V supply range and fully static core, the ATMEGA64L-8MQ supports battery-powered meters, dataloggers, and portable analyzers that must run from three NiMH cells or a 3.3V rail. Because the AVR achieves approximately one MIPS per MHz, the same application workload can be completed at lower clock frequencies, directly reducing dynamic power - a design tradeoff the Microchip product page highlights explicitly. The 2KB EEPROM stores calibration and user settings through power cycles without external NVM, and the 4KB SRAM accommodates buffering for logging bursts. The 9x9 mm VFQFN-64 footprint keeps portable PCB area small.
Recommended
Embedded Communication Nodes
The ATMEGA64L-8MQ's two UARTs, hardware SPI, and TWI (I2C-compatible) interfaces make it a strong fit for gateways and fieldbus nodes that bridge protocols - for example converting Modbus RTU on one UART to a CAN-adjacent SPI peripheral link on the other. The 64KB flash leaves room for protocol stacks, while 4KB SRAM supports packet buffering for message queues. The 10-bit ADC with 8 channels enables local analog telemetry, and the generous 54 I/O lines across ports A through G interface switches, relays, and status LEDs. In-system programmable flash allows network firmware rollout across deployed fleets without disassembly.
Recommended
Sensor Hubs and Data Acquisition
For data acquisition front ends, the ATMEGA64L-8MQ integrates an 8-channel 10-bit ADC, analog comparator, and multiple timer/PWM channels, allowing it to sample analog sensors and drive actuators in a closed loop without external coprocessors. The 32 x 8 general-purpose registers and single-cycle execution let interrupt service routines for ADC-complete and timer-overrun events run quickly, keeping sampling jitter low at 8 MHz. Its extended industrial temperature grade supports outdoor and factory-floor sensor enclosures. Pair the MCU with precision voltage references and SPI ADCs when better than 10-bit resolution is needed, using the SPI port at multi-MHz speeds.
Recommended
Consumer and Building Equipment
Equipment such as HVAC controllers, appliance boards, access-control panels, and lighting ballast controllers benefits from the ATMEGA64L-8MQ's combination of flash capacity, 54 general-purpose I/O lines, and green (Q-suffix) RoHS-compliant packaging required for consumer environmental compliance. The 2.7V to 5.5V supply range simplifies board-level power design, and the watchdog plus brown-out detection deliver the reset robustness expected in mains-powered appliances. Timers provide PWM channels for fan, blower, and backlight control, while TWI drives RTC and sensor chips. The self-programmable flash enables feature updates shipped via a service UART during product servicing.
Recommended
Legacy Production Continuity
A principal use of ATMEGA64L-8MQ today is sustaining legacy products - replacing failed components in installed industrial machines, medical-adjacent instruments, and infrastructure equipment whose firmware and qualification are frozen on the ATmega64 die. Buying the exact MPN preserves bit-level behavioral identity with the original design, eliminating requalification cost. Where stock runs dry, the same-footprint ATMEGA64L-8AQ and ATMEGA64A-MUR substitutes carry identical register maps, and Microchip designates the ATmega64A as the official replacement. Maintain buffer inventory, verify ISP programming fixtures against the substitute die revision, and validate full regression tests before switching sources.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA64L-8MQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA64L-8AQ | ATMEGA64A-MUR | ATMEGA644P-20MQ | ATMEGA649A-MU |
|---|---|---|---|---|---|
| Package | 64-VFQFN (9x9 mm), exposed pad | 64-QFN (9x9) - same | 64-MLF (9x9) - same | 64-QFN (9x9) - same | 64-MLF (9x9) - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash | 64KB (32K x 16) | 64KB | 64KB | 64KB | 64KB |
| SRAM | 4KB | 4KB | 4KB | 4KB | 4KB |
| Max Clock Frequency | 8 MHz | 8 MHz | 8 MHz (16 MHz at 5V) | 20 MHz | 16 MHz |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V (at 20 MHz: 4.5-5.5V) | 2.7 V to 5.5 V |
| UARTs | 2 | 2 | 2 | 2 (P-enhanced) | 1 + LCD controller |
| Lifecycle Status | Mature / not recommended for new designs | Active (ATmega64A generation) | Active | Active | Active |
Key Differentiators
- Die-level legacy compatibility (vs ATMEGA644P-20MQ)
- Extended industrial temperature grade (vs ATMEGA64A-MUR)
- Low-voltage L operation at 8 MHz (vs ATMEGA64-16MI)
Design Notes
Microchip explicitly lists the ATmega64 as a mature product not recommended for new designs, replaced by the ATmega64A. If you must use ATMEGA64L-8MQ to match a frozen design, buy buffer stock now - Mouser shows only ~260 units in stock as of 2026-09-18 and mature AVR parts see abrupt allocation. Before qualifying ATMEGA64L-8AQ or ATMEGA64A-MUR as substitutes, run a full firmware regression: die revisions can shift errata items (UART framing edge cases, ADC mux behavior) that legacy code implicitly relied on.
The L variant tops out at 8 MHz across its full 2.7V-5.5V range; do not drop it into a board clocked at 16 MHz intended for the ATmega64-16 version - the same footprint (ATMEGA64-16MI) exists for 16 MHz designs. Exploit the MIPS-per-MHz efficiency: if the workload permits, clock at 4 MHz from a 3.3V rail to roughly halve dynamic current versus 8 MHz, since the AVR executes most instructions in one cycle. Enable brown-out detection at the level appropriate to your supply rail and always use the watchdog in production firmware.
The VFQFN-64 is a no-lead (QCCN) package whose center exposed pad must be soldered to a grounded copper thermal pad on the PCB - this pad carries heat and improves noise performance, so connect it to the ground plane with a via array (typically 5x5 or more). No-lead packages are hard to inspect; design with sufficient stencil aperture reduction (about 50-70% on the center pad) to prevent bridging. For ISP programming, reserve the dedicated SPI pins (MISO/MOSI/SCK/RESET) header accessibility even after final assembly.
Compliance Information
Q suffix denotes Microchip GREEN, RoHS-compliant matte-tin plating per FindIC and distributor listings. REACH and conflict-minerals status not stated in provided data.
