ATMEGA644V-10PU - 8-bit AVR MCU 64KB Flash 10MHz DIP-40 | Microchip
MPN: ATMEGA644V-10PU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.42 | $9.42 |
| 10 | $8.48 | $84.80 |
| 100 | $7.54 | $754.00 |
| 500 | $6.69 | $3,345.00 |
| 1,000 | $5.93 | $5,930.00 |
ATMEGA644V-10PU Overview
A microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and peripherals into one chip. The ATmega644V belongs to the AVR ATmega family of 8-bit microcontrollers, positioned above the ATmega48/88/168/328 line and below the ATmega1280/2560 megaAVR line in the power-management and embedded-control hierarchy. The AVR core executes most instructions in a single clock cycle using a Harvard architecture with 32 general-purpose working registers, achieving throughput close to 1 MIPS per MHz.
Key features include 64 KB self-programmable Flash with read-while-write support, 2 KB EEPROM, 4 KB SRAM, and 32 general-purpose I/O lines. On-chip peripherals cover two USARTs, a byte-oriented TWI (I2C) interface, SPI, an 8-channel 10-bit ADC, a real-time counter, and three flexible timers/counters with compare modes and PWM. The low-voltage V-variant operates from 1.8 V to 5.5 V at up to 10 MHz, enabling battery-powered and energy-harvesting designs.
Architecturally, the ATMEGA644V-10PU uses an enhanced RISC AVR core manufactured in a low-power CMOS process. JTAG (IEEE 1149.1) boundary scan, on-chip debug, and In-Circuit Serial Programming (ICSP) via RESET/VCC/GND and two I/O pins simplify development; the MPLAB SNAP and earlier AVR ISP tools program the device in-circuit.
Typical applications include low-power battery-operated sensor nodes, industrial control panels, hobbyist and educational boards (such as Sanguino-class Arduino derivatives), and embedded instrumentation where a through-hole DIP-40 footprint simplifies prototyping and repair.
One key design consideration: clock frequency is voltage-dependent; at VCC below 2.7 V the maximum safe clock is limited, so verify the frequency-versus-voltage curve in the Microchip datasheet before overclocking near the 1.8 V floor.
This page synthesizes distributor pricing, pin-compatible ATmega family alternatives, and practical design notes not found in the manufacturer datasheet, as of 2026-09-18.
Drop-in alternatives for ATMEGA644V-10PU β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA644PV-10PU
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA644P-20PU
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA644A-PU
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA644PA-PU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA644V-10AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA644PV-10AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA644V-10PU Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR enhanced RISC |
| Maximum Clock Frequency | 10 MHz |
| Flash Memory | 64 KB (32K x 16) In-System Programmable |
| EEPROM | 2 KB |
| SRAM | 4 KB |
| Operating Voltage Range | 1.8 V to 5.5 V |
| I/O Pins | 32 general purpose |
| ADC | 8-channel, 10-bit |
| USART | 2 |
| SPI | Yes, 1x SPI |
| TWI (I2C) | Yes, byte-oriented two-wire |
| Timers/Counters | 3 (with compare modes and PWM) |
| Real-Time Counter | Yes |
| JTAG | IEEE 1149.1 boundary scan, on-chip debug |
| Package | 40-Pin PDIP (through-hole) |
| Mounting Type | Through Hole |
| Operating Temperature | -40C to +85C (Industrial) |
| Programming | ICSP in-circuit serial programming |
| RoHS Status | Compliant (Green) |
ATMEGA644V-10PU Pin Configuration
| Pin 1 | PB0 (XCK0/T0) β Port B bit 0, USART0 external clock / Timer0 external clock |
| Pin 2 | PB1 (T1) β Port B bit 1, Timer1 external clock |
| Pin 3 | PB2 (AIN0/INT2) β Port B bit 2, analog comparator positive input / external interrupt 2 |
| Pin 4 | PB3 (AIN1/OC0A) β Port B bit 3, analog comparator negative input / Timer0 output compare A |
| Pin 5 | PB4 (SS) β Port B bit 4, SPI slave select |
| Pin 6 | PB5 (MOSI) β Port B bit 5, SPI master output / slave input |
| Pin 7 | PB6 (MISO) β Port B bit 6, SPI master input / slave output |
| Pin 8 | PB7 (SCK/UCSK) β Port B bit 7, SPI serial clock |
| Pin 9 | RESET β Reset input, active low |
| Pin 10 | VCC β Digital supply voltage (1.8 V to 5.5 V) |
| Pin 11 | GND β Ground |
| Pin 12 | XTAL2 β Inverting oscillator amplifier output |
| Pin 13 | XTAL1 β Inverting oscillator amplifier input / external clock input |
| Pin 14 | PD0 (RXD0) β Port D bit 0, USART0 receive |
| Pin 15 | PD1 (TXD0) β Port D bit 1, USART0 transmit |
| Pin 16 | PD2 (INT0/RXD1) β Port D bit 2, external interrupt 0 / USART1 receive |
| Pin 17 | PD3 (INT1/TXD1) β Port D bit 3, external interrupt 1 / USART1 transmit |
| Pin 18 | PD4 (XCK1/OC1B) β Port D bit 4, USART1 external clock / Timer1 output compare B |
| Pin 19 | PD5 (OC1A) β Port D bit 5, Timer1 output compare A |
| Pin 20 | PD6 (ICP1) β Port D bit 6, Timer1 input capture |
| Pin 21 | PD7 (OC2A/OC0B) β Port D bit 7, Timer2 output compare A / Timer0 output compare B |
| Pin 22 | PC0 (SCL) β Port C bit 0, TWI serial clock |
| Pin 23 | PC1 (SDA) β Port C bit 1, TWI serial data |
| Pin 24 | PC2 (TCK) β Port C bit 2, JTAG test clock |
| Pin 25 | PC3 (TMS) β Port C bit 3, JTAG test mode select |
| Pin 26 | PC4 (TDO) β Port C bit 4, JTAG test data output |
| Pin 27 | PC5 (TDI) β Port C bit 5, JTAG test data input |
| Pin 28 | PC6 (TOSC1) β Port C bit 6, Timer oscillator input (32.768 kHz RTC crystal) |
| Pin 29 | PC7 (TOSC2) β Port C bit 7, Timer oscillator output |
| Pin 30 | AVCC β Analog supply voltage for ADC |
| Pin 31 | GND β Ground |
| Pin 32 | AREF β Analog reference voltage for ADC |
| Pin 33 | PA0 (ADC0) β Port A bit 0, ADC channel 0 |
| Pin 34 | PA1 (ADC1) β Port A bit 1, ADC channel 1 |
| Pin 35 | PA2 (ADC2) β Port A bit 2, ADC channel 2 |
| Pin 36 | PA3 (ADC3) β Port A bit 3, ADC channel 3 |
| Pin 37 | PA4 (ADC4) β Port A bit 4, ADC channel 4 |
| Pin 38 | PA5 (ADC5) β Port A bit 5, ADC channel 5 |
| Pin 39 | PA6 (ADC6) β Port A bit 6, ADC channel 6 |
| Pin 40 | PA7 (ADC7) β Port A bit 7, ADC channel 7 |
Typical Applications
ATMEGA644V-10PU is suitable for 6 applications: Low-Power Battery Sensor Nodes, Industrial Control Panels and PLC I/O, Arduino-Compatible Educational and Hobbyist Boards, Embedded Instrumentation and Data Loggers, Serial Communication Bridges and Gateways, Motor Control and PWM Actuator Drivers.
Low-Power Battery Sensor Nodes
The ATMEGA644V-10PU's 1.8 V to 5.5 V operating range makes it a strong fit for battery-powered sensor nodes that must survive deep battery discharge. Running the AVR core at 1 MHz-4 MHz near 2.0-3.0 V minimizes active current, while power-down and power-save sleep modes reduce average consumption to microamp levels. The 8-channel 10-bit ADC digitizes analog sensors directly, and the TWI interface reads digital sensors over I2C. Data can be uploaded through either USART to a radio module. In practice, designers clock the part from an external low-frequency crystal for RTC timing and wake on timer interrupt; the key trade-off is that the 10 MHz speed ceiling limits compute-heavy DSP work compared with 20 MHz 644 grades, but at battery voltages that ceiling is often moot since the frequency-voltage curve restricts clocks anyway.
Recommended
Industrial Control Panels and PLC I/O
In industrial control panels, the ATMEGA644V-10PU supplies 32 GPIO lines with symmetrical sink/source output buffers, enough to drive relays, optocoupled inputs, and LED annunciators without external port expanders. Two independent USARTs allow simultaneous RS-485 field-bus and RS-232 HMI links, while the SPI interface connects to external EEPROM or RTC chips. The 10-bit ADC reads potentiometer setpoints and analog transmitters, and three timers generate PWM for heater or motor control. The industrial -40C to +85C rating suits unheated cabinets. Its through-hole DIP-40 package is an advantage in maintenance-heavy industrial equipment, because a failed controller can be swapped from a socket in minutes without soldering - a significant serviceability benefit over QFP/TQFP surface-mount parts such as the 644AU variants.
Recommended
Arduino-Compatible Educational and Hobbyist Boards
The ATMEGA644V-10PU is widely used in Sanguino-class and MightyCore Arduino-compatible boards because its DIP-40 package sockets into cheap perfboards and its 64 KB Flash / 4 KB SRAM roughly double the capacity of the Uno's ATmega328P. Educational users benefit from the forgiving through-hole format - miswired projects can be reprogrammed and re-socketed endlessly. The AVR core is natively supported by avr-gcc and the Arduino IDE via community cores; ICSP programming with an MPLAB SNAP or USBasp flash bootloaders through the 8-pin SIL connector documented by Microchip. The only caveat for Arduino users is that the V grade limits the clock to 10 MHz and tolerates low supply rails, so board definitions must match the actual 16 MHz/5 V or 10 MHz/3.3 V supply configuration to keep ADC calibration and delay timing correct.
Recommended
Embedded Instrumentation and Data Loggers
Standalone data loggers exploit the ATMEGA644V-10PU's 2 KB EEPROM for calibration constants and configuration, 64 KB Flash for self-programming boot-loaders, and 4 KB SRAM for ring-buffering sampled data. The 8-channel 10-bit ADC with internal reference samples analog channels from thermistors, strain gauges, and voltage dividers; the real-time counter can run asynchronously on a 32.768 kHz crystal in power-save mode to keep accurate timestamps between wake-ups. Logged data streams out over USART to an SD-card or radio module via SPI. Because the part sustains read-while-write Flash operation, firmware can log to a Flash-resident sector without halting execution - a feature that distinguishes the ATmega644 from smaller 8-bit MCUs. Its 1.8 V floor also allows logging on single lithium cells with a boost-free 2.5 V rail.
Recommended
Serial Communication Bridges and Gateways
With two full USARTs plus TWI and SPI on the same chip, the ATMEGA644V-10PU naturally bridges between dissimilar buses: for example, translating an I2C sensor network to RS-485 Modbus, or SPI-to-UART links between an offload processor and a host PC. The 10 MHz core executes interrupt-driven double-buffered UART service routines comfortably at 115200 baud on both ports, and the 4 KB SRAM provides message-buffer headroom that smaller ATmega48/88 parts lack. JTAG on-chip debug (IEEE 1149.1) through PC2-PC5 lets engineers watch protocol state machines in-system with JTAG ICE tools. Designers should reserve PD0-PD3 for the two UART pins and PC0/PC1 for TWI pull-ups (typically 4.7 kilo-ohm) early in layout, since these fixed-pin peripherals constrain routing on a 40-pin DIP board.
Recommended
Motor Control and PWM Actuator Drivers
The ATMEGA644V-10PU's three timers - two 8-bit and one 16-bit - each offer compare channels and PWM outputs (OC0A, OC1A, OC1B, OC2A on PB3/PD5/PD4/PD7), enabling multi-channel PWM for DC motor drives, LED dimming, and servo actuation. The 16-bit Timer/Counter1 with input-capture (PD6) measures sensor pulse widths and periods for encoder or ultrasonic feedback. A typical drive stage pairs the MCU PWM outputs with a MOSFET gate driver; the MCU sets PWM frequency via prescalers so switching losses stay manageable. At 10 MHz the part generates up to about 8-bit PWM at roughly 39 kHz on Timer0, adequate for silent motor control. For higher-speed or closed-loop field-oriented control, engineers should step up to the 20 MHz ATMEGA644P-20PU, which is pin-compatible in the same DIP-40 socket.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA644V-10PU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA644PV-10PU | ATMEGA644P-20PU | ATMEGA644A-PU | ATMEGA644V-10AU |
|---|---|---|---|---|---|
| Package | 40-PDIP | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 44-TQFP - different body |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Frequency | 10 MHz | 10 MHz | 20 MHz | 20 MHz | 10 MHz |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB | 64 KB |
| SRAM / EEPROM | 4 KB / 2 KB | 4 KB / 2 KB | 4 KB / 2 KB | 4 KB / 2 KB | 4 KB / 2 KB |
| Operating Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| USART Count | 2 | 2 | 2 | 2 | 2 |
| ADC | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit |
| Power Technology | Original low-power CMOS | PicoPower (lower sleep/active current) | picoPower generation | 644A refresh | Original low-power CMOS |
| Lifecycle Status | Mature (newer 644A/PV successors listed by Microchip) | Active successor | Active successor | Active successor | Mature (same generation) |
Key Differentiators
- Lowest voltage floor in the 40-pin ATmega644 family (vs ATMEGA644-20PU)
- Through-hole serviceability (vs ATMEGA644V-10AU)
- Doubled memory versus Uno-class parts (vs ATMEGA328P-PU)
- Lower successor availability (vs ATMEGA644PV-10PU)
Design Notes
Observe the frequency-versus-voltage safety envelope: at VCC below 2.7 V, do not clock the ATMEGA644V-10PU at its full 10 MHz without verifying the datasheet derating curve - running out of envelope causes marginal brownout behavior rather than clean failure. Decouple VCC and AVCC with 100 nF ceramics placed within 10 mm of pins 10 and 30, and tie AVCC to VCC through a 10 uH LC filter when the ADC is used in noisy switching environments. Enable the internal brownout detector via fuse for battery designs so the MCU holds reset through supply dips instead of corrupting EEPROM.
Fuse configuration is the most common failure point: disabling the RESET pin (RSTDISBL) or SPIEN while relying on ISP makes recovery impossible without high-voltage parallel programming. Second, when using JTAG (PC2-PC5), remember those pins are not available as GPIO unless the JTAGEN fuse is cleared. Third, the TWI pins PC0/PC1 are open-drain only - external pull-up resistors (typically 4.7 kilo-ohm at 100 kHz) are mandatory. Finally, XTAL1/XTAL2 pins 12-13 must match the selected clock fuse settings; a mismatched CKSEL configuration silently leaves the device dead with a working program in Flash.
For DIP-40 prototyping, use ICSP headers wired to RESET/MOSI/MISO/SCK (pins 9, 6, 7, 8) plus VCC/GND so firmware can be updated without desocketing the chip. Add a 10 nF capacitor from AREF (pin 32) to ground and never drive AREF while the internal reference is selected, or the reference source will be shorted. Keep the 32.768 kHz RTC crystal on PC6/PC7 short-lead and physically isolated from the fast main oscillator to preserve RTC accuracy in power-save mode. An ISP series resistor (about 100 ohm) on RESET helps coexistence with external watchdog circuitry.
Compliance Information
Distributor listings describe the ATMEGA644V-10PU as GREEN (lead-free, halogen-free) and RoHS compliant. Industrial temperature grade; not an automotive AEC-Q100 device.
