ATMEGA64-16MUR - 8-Bit AVR MCU 64KB Flash 16MHz | Microchip
MPN: ATMEGA64-16MUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.85 | $7.85 |
| 10 | $7.15 | $71.50 |
| 100 | $6.42 | $642.00 |
| 500 | $5.8 | $2,900.00 |
| 1,000 | $5.21 | $5,210.00 |
ATMEGA64-16MUR Overview
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, so throughput approaches one MIPS per MHz. Within the power-management hierarchy, an MCU integrates CPU, memory, and peripherals (timers, UARTs, SPI, ADC) on one die, replacing multi-chip designs and reducing board complexity in embedded systems.
Key features include the AVR enhanced RISC core with 130 powerful instructions and 32 x 8 general-purpose working registers, fully static operation, 16 MHz maximum clock speed, and a supply voltage range of 4.5 V to 5.5 V. The 64 KB self-programmable flash supports in-system programming via SPI, while the separate 2 KB EEPROM retains calibration data through power cycles.
Peripherals on this device include two 8-bit and two 16-bit timers with PWM, two UARTs, an 8-channel 10-bit ADC, an analog comparator, SPI and TWI (I2C) serial interfaces, and a JTAG boundary-scan/debug port. The architecture achieves near one MIPS per MHz, letting designers optimize power consumption versus processing speed - important for battery-backed industrial nodes.
Typical applications include industrial automation controllers, building automation and HVAC nodes, embedded instrumentation, and motor-control auxiliary boards that need a mature, well-documented 5 V MCU with generous I/O.
Design consideration: this is a mature product; Microchip lists the newer ATmega64A as its replacement and does not recommend the ATMEGA64-16MUR for new designs, though it remains active for existing production.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet, with prices as of 2026-09-18.
Drop-in alternatives for ATMEGA64-16MUR — 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 ATMEGA64-16MUR (same form factor and footprint) — differing in Package, ADC Channels, ADC Resolution, Flash Memory, JTAG Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA64A-MU
✅ Drop-In✓ In Stock
$4.24 / Unit
View Datasheet →ATMEGA64-16MI
✅ Drop-In✓ In Stock
$4.48 / Unit
View Datasheet →ATMEGA649-16MUR
✅ Drop-In✓ In Stock
$7.6 / Unit
View Datasheet →ATMEGA64-16MUR Maximum Ratings & Electrical Characteristics
| Core | AVR 8-bit RISC |
| Data Bus Width | 8 bit |
| Maximum Clock Frequency | 16 MHz |
| Flash Memory Size | 64 KB (32K x 16) |
| SRAM Size | 4 KB |
| EEPROM Size | 2 KB |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Number of I/O Ports | 53 |
| Timers | 2 x 8-bit, 2 x 16-bit |
| UART / USART | 2 |
| ADC Resolution | 10 bit |
| ADC Channels | 8 |
| Serial Interfaces | SPI, TWI (I2C), JTAG |
| Package | 64-QFN / MLF, 9 x 9 mm |
| Mounting Type | Surface Mount |
| MIPS per MHz | Approaching 1 |
| Lifecycle Status | Active / mature, replaced by ATmega64A |
ATMEGA64-16MUR 64-qfn / mlf, 9 x 9 mm Pin Configuration Guide
Pin configuration for ATMEGA64-16MUR (64-qfn / mlf, 9 x 9 mm 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 ATMEGA64-16MUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA64-16MUR is suitable for 6 applications: Industrial Automation Controllers, Building Automation and HVAC Nodes, Embedded Instrumentation and Test Fixtures, Motor Control Auxiliary Boards, Security and Access Control Terminals, Retrofit of ATmega103 Legacy Designs.
Industrial Automation Controllers
The ATMEGA64-16MUR fits industrial automation controllers because its 53 GPIO lines, dual UARTs, and 64 KB flash let one MCU handle sensor polling, operator-interface communication, and control logic simultaneously, while the 5 V supply matches legacy 24 V-input industrial I/O conditioning circuits that already run 5 V logic. In a typical controller, the MCU reads limit switches and analog sensors through the 8-channel 10-bit ADC, drives relays and status LEDs from port pins, and reports over RS-485 via a UART with an external transceiver. Because the AVR core delivers about one MIPS per MHz at 16 MHz, real-time loop rates in the low-kilohertz range are achievable. The fully static core and wide 4.5-5.5 V operating envelope tolerate supply sag common on industrial cabinets.
Recommended
Building Automation and HVAC Nodes
Building automation nodes benefit from the ATMEGA64-16MUR's combination of TWI (I2C) and SPI buses, which connect humidity, temperature, and pressure sensors, plus two UARTs that can simultaneously link to an RS-485 network and a service/debug console. The 2 KB EEPROM stores setpoints, schedules, and calibration constants that must survive power outages, avoiding external nonvolatile memory. With 4 KB SRAM, trend-logging buffers and Modbus frame handling fit without external RAM. The 5 V supply simplifies interfacing with optocoupled digital inputs for contactor feedback, and the 10-bit ADC reads 0-10 V sensor signals after simple resistive scaling. Its 16 MHz clock gives ample headroom for PID loops on dampers and valves executed at 10-100 Hz update rates in packaged AHU controllers.
Recommended
Embedded Instrumentation and Test Fixtures
Test fixtures and bench instrumentation use the ATMEGA64-16MUR where the JTAG port matters: on-chip debugging and boundary scan let engineers validate fixture PCBs and step through sequencer firmware during bring-up. The 64 KB flash accommodates large command menus, text on character LCDs, and lookup tables for calibration curves, while 4 KB SRAM holds capture buffers from the 8-channel 10-bit ADC. Two UARTs allow simultaneous host-PC communication and instrument-under-test control. Because the device is 5 V, it directly drives opto-isolated stimulus outputs and reads TTL-level responses without level shifters, which is the dominant convention on production-line test gear. The 16 MHz clock supports microsecond-resolution timing via the 16-bit timers for pass/fail timing measurements.
Recommended
Motor Control Auxiliary Boards
On motor-drive auxiliary and supervisory boards, the ATMEGA64-16MUR plays a monitoring role: its 8-channel 10-bit ADC samples DC-bus voltage, heatsink temperature, and phase-current signals from isolated sensors, while hardware PWM channels from its four timers generate gate-driver or fan-control outputs. The 4.5-5.5 V supply ties into the drive's existing 5 V housekeeping rail, and 53 I/O lines accommodate DIP switches, fault relays, and LED status clusters without port expanders. Dual UARTs support a Modbus RTU port plus a bootloader port for field firmware updates written into the self-programmable 64 KB flash. The 16 MHz clock yields sub-microsecond PWM granularity, and the fully static core keeps timing deterministic under noisy drive environments.
Recommended
Security and Access Control Terminals
Access-control terminals use the ATMEGA64-16MUR's generous memory to hold Wiegand readers, keypad matrices, and local credential caches: 64 KB flash stores bootloader plus application and a local whitelist, while 2 KB EEPROM keeps credential counts and audit pointers across resets. The 53 GPIO lines scan a 4x4 to 8x8 key matrix, drive a backlit LCD, and operate a locking relay and tamper switch, all on one MCU. One UART talks to the door controller over RS-485; the second supports service configuration. The 5 V supply matches the standard 12 V-lock systems' regulated 5 V rail, and the 16 MHz clock handles Wiegand pulse decoding with interrupts well within timing margins. JTAG enables production programming and factory test in one connector.
Recommended
Retrofit of ATmega103 Legacy Designs
The ATMEGA64-16MUR is a direct modernization path for legacy ATmega103 boards: Microchip's ATmega64 datasheet states the ATmega64 is 100% pin compatible with the ATmega103 and can replace it on current printed circuit boards. Retrofit designs gain 64 KB self-programmable flash versus the ATmega103's smaller non-self-programmable memory, doubled SRAM at 4 KB, a 10-bit ADC, TWI, and JTAG debug - none of which the ATmega103 offered. Because the footprint and pinout match, no PCB respin is required; only the application note 'Replacing ATmega103 by ATmega128' / migration guidance for ATmega64 register and fuse differences must be reviewed. The 16 MHz speed grade also doubles legacy 8 MHz timing margins while staying on the same 5 V supply.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA64-16MUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA64A-MU | ATMEGA64-16MI | ATMEGA649-16MUR |
|---|---|---|---|---|
| Package | 64-QFN / MLF (9x9 mm) | 64-QFN / MLF (9x9 mm) - same | 64-QFN / MLF (9x9 mm) - same | 64-QFN / MLF (9x9 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 2 KB |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 3.3 V / 5 V capable platform |
| Special Features | JTAG, 2x UART, 10-bit ADC, mature product | JTAG, 2x UART, 10-bit ADC, current-production successor | JTAG, 2x UART, 10-bit ADC, industrial temp suffix | Adds segment LCD controller, different pin mux |
| Lifecycle Status | Active / mature (NRND, replaced by ATmega64A) | Active (recommended) | Active / mature | Active |
Key Differentiators
- Five-volt tolerance with 53 I/O lines (vs ATMEGA328P-MU)
- JTAG on-chip debug and boundary scan (vs ATMEGA328P-MU)
- Lifecycle trade-off: mature die (vs ATMEGA64A-MU)
Design Notes
The ATMEGA64-16MUR requires a regulated 4.5-5.5 V rail; do not attempt 3.3 V operation as the 16 MHz speed grade is only valid on the 5 V envelope. Decouple every VCC and AVCC pin pair with 100 nF ceramic capacitors placed within a few millimeters of the MLF pads, plus one bulk 10 uF per supply domain. The large center die-attach pad on the 64-pin MLF must be soldered to a grounded copper pour - it is the primary ground return and thermal path; skipping it causes unreliable ADC reference stability and JTAG failures.
On the 64-lead MLF land pattern, use Microchip's recommended courtyard with approximately 0.5 mm stencil aperture per pad and a saw-tooth or grid array of vias in the center pad to evacuate solder during reflow - excess center-pad solder causes the package to float and lift outer leads. Keep the XTAL1/XTAL2 16 MHz crystal traces under 10 mm with guard ground, and route RESET (active-low, with PEN on the MLF pinout) away from switching noise; a 10 kOhm pull-up on RESET is standard practice.
Three recurring mistakes with this part: (1) specifying the ATMEGA64-16MUR for new designs when it is flagged mature/NRND - select the ATMEGA64A-MU instead to avoid a future last-time-buy; (2) assuming the JTAG interface is enabled - JTAGEN fuse state and lock-bit configuration must be verified, otherwise ISP programming may behave unexpectedly; (3) treating the ATMEGA649 as a plug-in swap because the package matches - its LCD controller and changed peripheral multiplexing break pin-for-pin compatibility at ports where the LCD function overlaps.
Compliance Information
The FindIC listing describes the ATMEGA64-16MUR as 'GREEN' packaging (Microchip's lead-free/RoHS-friendly designation). Full REACH and halogen-free declarations should be confirmed on Microchip's official environmental page.
