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ATMEGA640V-8CUR

ATMEGA640V-8CUR - 8MHz AVR 64KB MCU 100-CBGA | Microchip

The Microchip Technology ATMEGA640V-8CUR is an 8-bit AVR RISC microcontroller with 64 KB ISP Flash memory, 8 KB SRAM, and 4 KB EEPROM, rated for operation up to 8 MHz at 1.8 V to 5.5 V in a 100-ball CBGA (9x9 mm) package. An 8-bit microcontroller (MCU) is an integrated circuit that combines a processor core, memory, and peripherals on a single die, executing one instruction per clock cycle in the AVR RISC architecture. MCUs sit at the lowest level of the embedded system hierarchy - above discrete logic and below application processors - and are the workhorse of industrial control, instrumentation, and consumer electronics. The ATmega640 belongs to the megaAVR family, the large-pin-count branch of the AVR product line. Key features include 64 KB of self-programmable ISP Flash, 86 general purpose I/O lines, 32 general purpose working registers, a real-time counter, six flexible timer/counters, and in-circuit serial programming (ICSP) via just two device I/O pins plus reset. The V-suffix device supports the extended low-voltage operating range (1.8 V minimum), enabling battery-powered and low-voltage industrial designs. Architecturally, the AVR core executes most instructions in a single clock cycle through a Harvard-architecture pipeline with separate program and data buses, giving high code efficiency and deterministic timing. The device integrates JTAG-based on-chip debugging and supports the MPLAB Snap programmer through the 8-pin SIL ICSP connector. Typical applications include industrial automation controllers, building management nodes, instrumentation front ends, and battery-operated monitoring systems where the wide 1.8 V to 5.5 V supply range and low-power sleep modes are decisive. Design consideration: clock speed derates with supply voltage - 8 MHz is safe across the full 1.8 V to 5.5 V range, but verify the voltage-frequency curve if migrating to the 16 MHz ATMEGA640 variants. This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet, with pricing as of 2026-09-18.

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ATMEGA644-20AU

ATMEGA644-20AU - 8-Bit AVR MCU 64KB Flash 20MHz | Microchip

The Microchip Technology ATMEGA644-20AU is an 8-bit AVR RISC microcontroller with 64 KB in-system programmable Flash, 4 KB SRAM, 2 KB EEPROM, and 32 general-purpose I/O lines, operating at up to 20 MHz from a 2.7 V to 5.5 V supply in a 44-pin TQFP (10x10 mm) package. It delivers up to 20 MIPS throughput at 20 MHz, combining 131 powerful instructions with 32 general-purpose working registers for single-cycle execution. An AVR microcontroller is a Harvard-architecture 8-bit MCU family that executes most instructions in a single clock cycle using on-chip Flash program memory, SRAM data memory, and EEPROM non-volatile storage. Within the product taxonomy, the ATmega644 sits at AVR MCU -> 8-bit microcontroller -> embedded microcontroller -> integrated circuit, and it is the 64 KB Flash member of the ATmega164/324/644 pin-compatible family. Key features include 64 KB ISP Flash with read-while-write, 4 KB SRAM, 2 KB EEPROM, two USARTs, a byte-oriented two-wire serial interface, an 8-channel 10-bit ADC, three flexible timer/counters with compare and PWM modes, a programmable watchdog timer, and an internal calibrated RC oscillator. The JTAG interface supports IEEE 1149.1 boundary scan plus on-chip debug and programming. The device uses a low-power CMOS process with six sleep modes (Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and Extended Standby), enabling battery-powered designs to trade throughput for microamp-level current consumption. The 20 MHz speed grade (-20) supports 2.7 V to 5.5 V operation, while the 10 MHz and 16 MHz grades are restricted to lower supply ranges. Typical applications include industrial control panels, building automation nodes, motor control front-ends, battery chargers, handheld instruments, and legacy ATmega644 replacement in existing designs. The 32 I/O lines and dual USARTs make it well suited to multi-sensor data acquisition and serial gateway roles. When designing with this device, decouple every VCC pin with a 100 nF ceramic capacitor placed close to the pin, and keep the AREF pin bypassed with 100 nF plus a 10 uF bulk capacitor when using the ADC. Note that Microchip lists the ATmega644 as a mature product not recommended for new designs, with the ATmega644PA recommended as the successor. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single reference for procurement and second-source decisions.

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ATMEGA644-20MUR

ATMEGA644-20MUR - 8-bit AVR MCU 64KB Flash 20MHz | Microchip

The Microchip Technology ATMEGA644-20MUR is an 8-bit AVR RISC microcontroller with 64KB of ISP flash memory, 4KB SRAM, 2KB EEPROM, and a 20 MHz maximum clock frequency, operating from a 4.5V to 5.5V supply in a 44-pin VQFN (7x7 mm) exposed-pad package with industrial temperature rating. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, sitting within the microcontroller hierarchy between simple 8-bit MCUs and 32-bit ARM parts. ATmega devices integrate program flash, data SRAM, EEPROM, timers, USART, SPI, TWI (I2C), and a 10-bit ADC on a single die, making them complete embedded control solutions for cost-sensitive designs. Key features include 64KB self-programmable flash with read-while-write support, 32 general-purpose I/O lines, three flexible timers/counters with compare modes and PWM, a 10-bit 8-channel ADC, and in-circuit serial programming (ICSP) compatible with the MPLAB SNAP and AVR ISP tools. The AVR core achieves close to 1 MIPS per MHz, so at 20 MHz the device delivers roughly 20 MIPS throughput while drawing low active current. Architecturally, the ATmega644 uses 32 general-purpose working registers directly connected to the ALU, eliminating intermediate register access overhead. Boot-code sections enable field firmware updates through the flash read-while-write mechanism, and hardware debug support is available via debugWIRE. Typical applications include industrial automation controllers, embedded sensor and instrumentation systems, motor and lighting control, and hobby/education platforms such as Arduino-compatible boards via the MightyCore hardware package. Design consideration: this 5V part requires a 4.5V-5.5V rail; the picoPower ATMEGA644PA variant is required for 1.8V-5.5V low-power designs. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA644-20PU

ATMEGA644-20PU - 8-bit AVR MCU 64KB 20MHz DIP-40 | Microchip

The Microchip Technology ATMEGA644-20PU is an 8-bit AVR enhanced RISC microcontroller with 64KB of In-System Programmable Flash, 4KB of SRAM, 2KB of EEPROM, and a maximum clock frequency of 20 MHz, housed in a 40-pin PDIP (0.600 inch / 15.24 mm) through-hole package. An 8-bit microcontroller is a self-contained computing IC that integrates a processor core, program memory, data memory, and peripherals such as timers, UARTs, and analog-to-digital converters on a single die. Within the product hierarchy, the ATmega644 belongs to the AVR ATmega family of flash-based MCUs, which sit under the broader categories of 8-bit microcontrollers, embedded processors, and integrated circuits. The AVR architecture executes most instructions in a single clock cycle through its 32 general-purpose working registers, delivering high code efficiency for embedded control systems. Key features of the ATMEGA644-20PU include 64KB of self-programmable Flash memory with read-while-write capability, 32 general-purpose I/O lines, two USARTs for serial communication, and three flexible timer/counters with compare modes and PWM outputs. The device also integrates a byte-oriented two-wire serial interface (TWI/I2C), an SPI serial interface, a 10-bit ADC, a programmable watchdog timer with separate on-chip oscillator, and an on-chip analog comparator. Technically, the AVR core uses a Harvard architecture with separate program and data buses. JTAG (IEEE 1149.1 compliant) boundary-scan and on-chip debugging are supported, and In-Circuit Serial Programming (ICSP) allows firmware updates without removing the chip from the board. Boot loader support with self-programming enables field firmware upgrades, while five sleep modes (including power-down and power-save) reduce current consumption in battery-conscious designs. Typical applications include industrial control and automation panels, embedded instrumentation and data loggers, and educational or hobbyist single-board systems. The 40-pin PDIP package is a major advantage for prototyping, repair, and low-volume production, since the chip can be socketed and replaced without soldering equipment. When designing with this device, remember that the full 20 MHz speed grade requires a supply voltage in the higher portion of the operating range; for low-voltage operation at 2.7V to 5.5V the clock frequency must be derated according to the speed-grade curves in the manufacturer datasheet. Decouple VCC and AVCC separately with 100 nF ceramic capacitors placed close to the pins. This page synthesizes distributor pricing, drop-in alternatives from the same ATmega family, design notes, and application guidance not found together on the manufacturer datasheet, with pricing referenced as of 2026-09-18.

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ATMEGA644A-AU

ATMEGA644A-AU - 8-bit AVR MCU 20MHz 64KB Flash | Microchip

The Microchip Technology ATMEGA644A-AU is an 8-bit AVR enhanced RISC microcontroller with 64 KB ISP Flash, 4 KB SRAM, and 2 KB EEPROM in a 44-pin TQFP (10x10 mm) package, executing up to 20 MIPS at 20 MHz across a 1.8 V to 5.5 V supply range. An 8-bit microcontroller is a single-chip processor that integrates a CPU, memory, and peripherals onto one die, sitting within the broader hierarchy of semiconductor devices under the microcontroller IC category (MCU -> embedded processor -> integrated circuit). AVR parts from Microchip use an enhanced RISC core that executes most instructions in a single clock cycle, delivering roughly one MIPS per MHz of CPU throughput, which lets designers trade clock speed directly against power consumption. Key features include 64 KB of In-System Programmable Flash with Read-While-Write capability, a 2 KB EEPROM for data retention through power cycles, and 32 general purpose I/O lines. The peripheral set covers three flexible Timer/Counters with compare modes and PWM outputs, two USARTs, a byte-oriented 2-wire interface (TWI, I2C-compatible), and an SPI serial port. An 8-channel 10-bit ADC with an optional internal reference and a Real Time Counter round out the analog and timing resources. Architecturally, the ATmega644A pairs its AVR core with 32 general purpose working registers that are directly connected to the arithmetic logic unit, allowing one-cycle register access. In-System Programming through SPI and self-programming boot code enable field firmware updates without removing the device from the PCB, while code lock bits provide three levels of intellectual property protection. Typical applications include industrial automation nodes such as sensor acquisition and motor control, embedded instrumentation and test fixtures, and educational or hobby embedded platforms supported by Arduino-compatible toolchains like MightyCore. For design, operate the internal RC oscillator or drive XTAL1/XTAL2 with an external crystal up to 20 MHz, and budget brown-out detection configuration carefully when running near the 1.8 V supply floor. This page synthesizes verified distributor data, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. Pricing references are as of 2026-09-18.

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ATMEGA644A-AUR

ATMEGA644A-AUR - 8-bit AVR MCU 64KB Flash 20MHz TQFP-44 | Microchip

The Microchip Technology ATMEGA644A-AUR is an 8-bit AVR enhanced RISC microcontroller with 64 KB ISP Flash memory, 4 KB SRAM, and 2 KB EEPROM, executing up to 20 MIPS at a 20 MHz maximum clock frequency in a 44-pin TQFP (10x10 mm) package. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that fetches and executes most instructions in a single clock cycle, making it a core building block of the embedded controller hierarchy (MCU -> microcontroller -> semiconductor). The ATmega644A belongs to the ATmega family that spans the ATmega164A, ATmega324A, ATmega644A, and ATmega1284 devices, all sharing an identical peripheral set and pinout across different Flash densities. Key features include 32 general purpose I/O lines, two programmable serial USARTs, one byte-oriented 2-wire serial interface (TWI/I2C), one SPI interface, an 8-channel 10-bit ADC with optional differential input stage, and three flexible Timer/Counters with compare modes and PWM. A Real Time Counter (RTC) with separate oscillator supports battery-backed timekeeping, and read-while-write Flash allows firmware updates while executing code. Architecturally, the device pairs 64 KB of In-System Programmable Flash with 32 general purpose working registers directly connected to the ALU, so a single-cycle instruction achieves throughput approaching 1 MIPS per MHz. Low-power CMOS process technology plus multiple sleep modes allow system designers to optimize power consumption against processing speed, which is why the family remains popular for cost-sensitive embedded designs. Typical applications include industrial automation controllers, sensor data loggers, motor control interfaces, and hobbyist or Maker boards such as Arduino-compatible systems supported by MCUdude MightyCore. The 20 MHz speed and 4 KB SRAM comfortably handle protocol bridging and display driving tasks. A key design consideration is clock sourcing: the ATmega644A supports an external crystal via XTAL1/XTAL2 pins, and fuse configuration determines clock source and brown-out thresholds, so verify fuses before switching clock schemes. Budget ADC accuracy margin by using a quiet AVCC supply and AREF filtering. This page synthesizes distributor pricing, drop-in family alternatives, comparison tables, and practical design notes not found in the manufacturer datasheet, giving engineers a complete single-source reference. Pricing references are as of 2026-09-18 from distributor data.

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ATMEGA644A-MUR

ATMEGA644A-MUR - 8-bit AVR MCU 64KB Flash 20MHz | Microchip

The Microchip Technology ATMEGA644A-MUR is a high-performance 8-bit AVR RISC microcontroller with 64 KB of In-System Programmable (ISP) Flash memory, 4 KB SRAM, 2 KB EEPROM, and a 20 MHz maximum clock frequency, housed in a 44-pin VQFN (7x7 mm) package with exposed pad. It executes most instructions in a single clock cycle, delivering throughput approaching 1 MIPS per MHz for power-efficient real-time control. An 8-bit AVR microcontroller is a Harvard-architecture processor that separates program and data memory, pairing an enhanced RISC CPU core with on-chip flash, SRAM, and EEPROM. Within the embedded systems hierarchy, the ATmega family sits in the mid-range 8-bit microcontroller tier below 32-bit ARM devices, serving as the complete system-on-chip for cost- and power-sensitive control applications. Key features of the ATMEGA644A-MUR include 64 KB ISP flash with read-while-write capability for self-programming and firmware updates in the field, 32 general purpose I/O lines with internal pull-ups, two flexible USARTs for multi-channel serial communication, a byte-oriented 2-wire (TWI/I2C) interface, an SPI serial port, and three flexible timers/counters with compare modes and PWM channels. A real-time counter supports RTC functions, and JTAG-based on-chip debugging simplifies development. Architecturally, the ATmega644A is a member of the ATmega164A/PA/324A/PA/644A/PA/1284/P family, sharing a common core, peripheral set, and pinout across flash densities. The enhanced RISC core uses 32 general purpose working registers directly connected to the ALU, allowing one register and one memory operand to be processed in a single instruction. The device operates over an industrial temperature range and supports supply options across 2.5V, 3.3V, and 5V rails per distributor listings. Typical applications include industrial automation controllers, building and home automation nodes, motor control and battery management systems, embedded instrumentation, and legacy AVR design maintenance. The 64 KB flash and 4 KB SRAM provide headroom for communication stacks such as Modbus or lightweight TCP implementations that smaller ATmega328 devices cannot host. When designing with this device, note that Microchip application note AVR536 documents reduced low-frequency crystal oscillator drive strength versus the earlier ATmega644, so crystal load capacitance and ESR must be verified during migration. Decouple AVCC separately and place 100 nF ceramics at each supply pin. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA644P-15AT

ATMEGA644P-15AT - 8-bit AVR MCU 64KB Flash 16MHz TQFP-44 | Microchip

The Microchip Technology (Atmel) ATMEGA644P-15AT is an 8-bit AVR enhanced RISC microcontroller integrating 64KB of in-system programmable Flash, 4KB SRAM, and 2KB EEPROM in a 44-pin TQFP (10x10 mm) surface-mount package. It executes instructions in a single clock cycle, delivering throughputs approaching 1 MIPS per MHz at its 16MHz maximum operating frequency. The -15AT speed grade is the 16MHz @ 5V industrial variant; the same die is offered as -20AU at 20MHz. A microcontroller (MCU) is a single-chip computer that integrates a processor core, program memory (Flash), data memory (SRAM), non-volatile storage (EEPROM), and peripherals such as timers, serial interfaces, and analog-to-digital converters. Within the AVR ATmega hierarchy, the ATmega644P sits in the mid-to-high range: ATmega48 < ATmega88 < ATmega164P < ATmega324P < ATmega644P < ATmega1284, all built on the AVR 8-bit RISC core with Atmel picoPower technology for reduced active and sleep-mode current. Key differentiating features include 32 general-purpose I/O lines, two USARTs (the 'P' suffix denotes the dual-USART enhancement over the original ATmega644), an 8-channel 10-bit ADC with optional differential mode and programmable gain, a byte-oriented 2-wire serial interface (TWI/I2C), SPI, three flexible Timer/Counters with PWM, a Real-Time Counter, and a programmable Watchdog Timer. In-system programmable Flash with Read-While-Write capability allows firmware updates without chip removal. Typical applications include industrial automation nodes, embedded sensor data acquisition with the 10-bit ADC, RS-232/RS-485 communication gateways using dual USARTs, hobbyist/Arduino-compatible designs (supported by the MightyCore hardware package), and AEC-Q100 grade 1 qualified automotive-adjacent systems where -40C to +85C operation is required. When designing, observe the 10x10 mm TQFP land pattern, decouple VCC and AVCC, and verify external crystal drive levels. The two-cycle load/store architecture and Harvard memory layout are transparent to C code but influence interrupt latency. Be aware that ATMEGA644P-15AT is mature and not recommended for new designs - the ATmega644PA successor is preferred. This page synthesizes verified distributor listings, AEC-Q100 qualification references, drop-in family alternatives (including the ATmega644PA successor), and practical design notes not consolidated in the manufacturer datasheet.

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ATMEGA644P-15AZ

ATMEGA644P-15AZ - 8-bit AVR MCU 64KB 16MHz TQFP-44 | Microchip

The Atmel/Microchip ATMEGA644P-15AZ is an 8-bit AVR ATmega microcontroller with a 16MHz AVR enhanced RISC core, 64KB (32K x 16) In-System Programmable Flash, 4KB SRAM, and 2KB EEPROM, housed in a 44-pin TQFP (10x10 mm) package. It executes most of its 131 powerful instructions in a single clock cycle, achieving throughput close to 1 MIPS per MHz. An 8-bit microcontroller is an integrated circuit containing a processor core, memory, and programmable peripherals on a single chip, optimized for embedded control. Within the power management and system hierarchy, the ATmega644P sits in the AVR ATmega family of general-purpose 8-bit MCUs, combining flash-based program storage with rich analog and digital peripherals. Key features include 64KB self-programmable Flash, 4KB SRAM, 2KB EEPROM, two USARTs (the P variant adds a second USART versus the non-P ATmega644), a 10-bit ADC with up to 8 channels, JTAG for on-chip debugging, and picoPower low-power technology. Operating voltage is 4.5V to 5.5V at the 16MHz speed grade. Architecturally, the device is based on the AVR enhanced RISC architecture with 32 general-purpose working registers directly connected to the ALU, allowing two independent registers to be accessed in one instruction. The picoPower CMOS process enables power-optimized sleep modes, letting designers trade processing speed against energy consumption. Typical applications include industrial automation and sensor systems, building and HVAC control, motor-control front ends, and general embedded systems where a second UART, JTAG debugging, and 5V operation are required. The TQFP-44 footprint also allows migration to the ATMEGA644PA drop-in successor without PCB redesign. A key design consideration: at 16MHz this part requires 4.5V to 5.5V; for 2.7V to 5.5V low-voltage designs choose the PA variant or lower speed grade. Always validate the ADC reference (AVCC or AREF) decoupling for analog accuracy. This page synthesizes verified distributor data, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, with pricing as of 2026-09-18.

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ATMEGA644P-15MT

ATMEGA644P-15MT - 8-bit AVR MCU, 64KB Flash, 44-VQFN | Microchip

The Microchip Technology ATMEGA644P-15MT is an 8-bit AVR RISC microcontroller with 64KB of In-System Programmable Flash, 4KB of SRAM, 2KB of EEPROM, and a 16MHz maximum core clock, housed in a 44-pin VQFN (7x7 mm) package with exposed pad. It is an Automotive AEC-Q100 qualified member of the AVR ATmega family and the picoPower generation of the ATmega644. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, delivering throughput close to 1 MIPS per MHz. In the power-management hierarchy of embedded systems, a microcontroller such as the ATmega644P sits at the application layer, integrating CPU, program memory, data memory, analog peripherals, and serial interfaces into a single semiconductor device. Key features include 131 powerful instructions, most executed in a single cycle; 32 general purpose I/O lines; two USARTs for dual serial communication; a byte-oriented 2-wire interface (TWI/I2C); an SPI interface; and an 8-channel 10-bit ADC with an optional internal reference. Three flexible Timer/Counters with compare modes and PWM outputs support motor control and lighting applications, and a Real Time Counter (RTC) with separate oscillator supports timekeeping. Technically, the picoPower CMOS process gives the ATmega644P very low active and sleep current consumption, with six power-saving modes including Idle, Power-down, Power-save, and Standby. Software-selectable clock prescalers let designers trade throughput for current, and the internal RC oscillator removes external crystals in cost-sensitive designs. The 64KB Flash supports Read-While-Write operation for safe in-system self-programming via the bootloader. Typical applications include automotive body electronics and sensor nodes (leveraging the AEC-Q100 qualification), industrial control and HMI boards, battery-powered instrumentation, and dual-UART gateways bridging RS-232/RS-485 to system diagnostics. The dual USART and 4KB SRAM make it well suited to protocol conversion tasks that exceed smaller ATmega parts. A key design consideration is that Microchip lists this part as a mature product, not recommended for new designs, replaced by the ATmega644PA; pin-to-pin migration to the PA variant preserves the footprint while improving power performance. Verify end-of-life status and long-term supply before committing to new layouts. This page synthesizes distributor pricing, drop-in alternatives, design notes, and lifecycle guidance not found in the manufacturer datasheet alone.

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ATMEGA644P-20AQR

ATMEGA644P-20AQR - 8-bit AVR MCU 64KB 20MHz TQFP-44 | Microchip

The Microchip Technology ATMEGA644P-20AQR is an 8-bit AVR ATmega microcontroller delivering 20MHz operation, 64KB (32K x 16) In-System Programmable Flash, 4KB SRAM and 2KB EEPROM in a 44-pin TQFP (10 x 10 mm) surface-mount package. An 8-bit microcontroller is an integrated circuit that executes program instructions, manages peripherals, and interfaces with sensors and actuators using 8-bit-wide data words. The ATmega644P belongs to the AVR family of enhanced RISC microcontrollers, which sits within the broader hierarchy of embedded processors and power-efficient system-on-chip solutions for cost-sensitive control applications. Key features include the AVR enhanced RISC architecture executing 131 powerful instructions, most in a single clock cycle, for throughput close to 1 MIPS per MHz. The dual-UAVR 'P' variant adds a second USART, enabling two independent serial communication channels. Peripherals include an 8-channel 10-bit ADC, JTAG for on-chip debugging, and an internal oscillator option. The picoPower family heritage supports low-power design strategies. Technically, the device achieves single-cycle ALU operation through its advanced RISC pipeline, letting system designers trade processing speed directly against power consumption. Program memory is In-System Programmable via SPI (ICSP), and the JTAG interface supports boundary-scan and in-circuit debugging with tools such as the MPLAB SNAP. Typical applications include industrial automation controllers, embedded sensing and data-logging nodes, and hobby/education platforms such as 3D printer controllers, where two hardware UARTs simplify communication with both a host and a peripheral. When designing with this part, verify supply-voltage tolerance against your clock target: full 20MHz operation is specified at the 5V industrial supply range noted by distributor data. This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet, with prices as of 2026-09-18.

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ATMEGA644P-20AU

ATMEGA644P-20AU - 8-Bit AVR MCU 20MHz 64KB Flash TQFP-44 | Microchip

The Microchip Technology ATMEGA644P-20AU is an 8-bit AVR RISC microcontroller with 64KB (32K x 16) in-system programmable FLASH, 4KB SRAM, 2KB EEPROM, and a 20MHz maximum clock, housed in a 44-pin TQFP (10x10 mm) package operating from 4.5V to 5.5V over the industrial temperature range. An 8-bit microcontroller is a self-contained computing IC that integrates a CPU core, program memory, data memory, and peripherals such as UARTs, timers, ADCs, and SPI/I2C interfaces on a single die. Within the power-management hierarchy of an embedded system, the MCU sits at the control layer, executing firmware that orchestrates sensors, actuators, and communication links. The AVR family, originally developed by Atmel and now part of Microchip Technology, executes most instructions in a single clock cycle, delivering approximately 1 MIPS per MHz. Key features of the ATmega644P include the advanced AVR RISC architecture with 130 powerful instructions and 32 general-purpose working registers, up to 20 MIPS throughput at 20MHz, and two programmable serial USARTs. The P suffix denotes the enhanced variant with PicoPower-class low-power features and an additional USART compared with the base ATmega644. Technical depth: the device integrates a 10-bit ADC, SPI and TWI (I2C) serial interfaces, multiple PWM-capable timers, an on-chip debug capability, and in-system programming (ISP) via the SPI interface. Self-programming FLASH enables boot-loader firmware updates in the field. Typical applications include industrial control panels, motor control and power-supply supervision, metering and sensor-hub nodes, and legacy Arduino-compatible boards that use the ATmega644P core. Design consideration: the 20MHz grade requires 4.5V to 5.5V operation; for 3.3V designs, derate the clock or choose a PicoPower ATmega644PA variant. Decouple AVCC and VCC separately for ADC accuracy. This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not consolidated in the manufacturer datasheet.

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ATMEGA644P-20MQ

ATMEGA644P-20MQ - 8-bit AVR MCU 64KB 20MHz VQFN-44 | Microchip

The Microchip Technology ATMEGA644P-20MQ is a low-power 8-bit AVR ATmega microcontroller featuring 64KB (32K x 16) FLASH program memory, 4KB SRAM, 2KB EEPROM, and a 20MHz CPU delivering up to 20 MIPS, housed in a 44-pad VQFN (7x7 mm) package with exposed pad. It operates from a 5V supply across an extended industrial temperature range. An 8-bit microcontroller is an integrated circuit that combines a processor core, memory, and peripherals such as UARTs, timers, and ADCs on a single chip, forming the lowest tier of the embedded-computing hierarchy (MCU -> embedded processor -> system-on-chip). AVR MCUs like the ATmega644P use an enhanced RISC Harvard architecture in which most of the 131 instructions execute in a single clock cycle, yielding throughput close to 1 MIPS per MHz. Key features of the ATMEGA644P-20MQ include dual UARTs (2-USART digital communication peripherals), picoPower low-power technology for sleep-current-sensitive designs, an internal RC oscillator that eliminates external crystals in many designs, and 32 general-purpose I/O lines organized as four 8-bit ports (PA-PD). The P suffix denotes the two-USART variant of the ATmega644 family. The AVR core pairs the RISC engine with peripherhals including 8/16-bit timers with PWM, a 10-bit ADC with multiplexed inputs on port A, TWI (I2C-compatible) and SPI serial interfaces, brown-out detection, and in-circuit serial programming (ICSP) via the reset line using only two device I/O pins. The exposed-pad VQFN-44 package improves thermal performance and grounding over the TQFP variant. Typical applications include industrial automation nodes, sensor acquisition systems, motor control front-ends, and embedded controllers where 64KB of flash, dual serial ports, and 5V noise immunity are required. Design consideration: the manufacturer has marked the ATmega644P as a mature product not recommended for new designs; new boards should target the ATmega644PA, which is a pin-compatible drop-in with lower active and sleep current. This page synthesizes verified distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA644P-20MQR

ATMEGA644P-20MQR - 8-Bit AVR MCU 20MHz 64KB | Microchip

The Microchip (Atmel) ATMEGA644P-20MQR is a high-performance, low-power 8-bit AVR RISC microcontroller running at 20 MHz with 64 KB of Flash program memory, 4 KB of SRAM, and 2 KB of EEPROM, housed in a 44-pin VQFN (7x7 mm, MLF) exposed-pad package rated for the extended industrial temperature range of -40C to +105C. An 8-bit AVR microcontroller is a single-chip computer that combines an enhanced RISC CPU, program and data memory, and a rich set of peripherals on one die. Within the broader product hierarchy, it belongs to the ATmega family of AVR MCUs, which in turn sit under the microcontroller and embedded-processor categories of the semiconductor taxonomy. Key features include 131 powerful instructions with mostly single-clock-cycle execution, achieving close to 1 MIPS per MHz throughput. The 'P' variant adds a second USART, giving two full-duplex serial ports, plus SPI, two-wire interface (TWI/I2C), a 10-bit 8-channel ADC, two 8-bit and one 16-bit timers, and JTAG for on-chip debugging and boundary scan. picoPower technology supports low-power sleep modes for battery-sensitive designs. Architecturally, the device executes powerful instructions in a single clock cycle, letting system designers optimize the trade-off between processing speed and power consumption. In-system programmable (ISP) Flash via In-Circuit Serial Programming (ICSP) simplifies field updates, and debugging is supported through the MPLAB Snap and compatible AVR tools using two I/O pins plus reset. Typical applications include industrial automation controllers, dual-channel serial communication gateways using the twin USARTs, and precision analog sensor acquisition via the 8-channel 10-bit ADC. Design consideration: full 20 MHz operation requires a supply of 4.5V to 5.5V; lower-voltage operation derates the maximum safe clock frequency, so verify the frequency-versus-voltage curve before clocking down. This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet.

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ATMEGA644P-20MU

ATMEGA644P-20MU - 8-bit AVR MCU 20MHz 64KB Flash | Microchip

The Microchip Technology ATMEGA644P-20MU is an 8-bit AVR ATmega microcontroller delivering 20MHz clock operation, 64KB (32K x 16) of In-System Programmable Flash memory, and 4KB of SRAM in a 44-pin VQFN (7x7 mm) exposed-pad package. It is a low-power CMOS device based on the AVR enhanced RISC architecture, executing most instructions in a single clock cycle for throughputs approaching 1 MIPS per MHz. A microcontroller unit (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals. In the hierarchy of embedded semiconductors, the ATmega644P sits in the 8-bit microcontroller class of the AVR family, a predecessor to modern AVR DA/DB parts and a sibling to the ATmega328P and ATmega1284P. Key features include 2KB of EEPROM for non-volatile data storage, two USARTs (the P variant adds a second serial port versus the standard ATmega644), a 10-bit ADC with up to 8 channels, an SPI interface, a two-wire I2C-compatible interface, and a JTAG interface for on-chip debug and boundary scan. The device operates at 5V (Vcc range 4.5V to 5.5V at 20MHz per the industrial temperature, green variant), making it robust for noisy environments where 3.3V MCUs are less tolerant. Technically, the AVR core uses a Harvard architecture with separate program and data buses and 32 general-purpose working registers directly connected to the ALU. This single-cycle execution model allows deterministic timing that remains popular in bit-banged protocols, motor control loops, and legacy firmware maintenance. Low-voltage capability down to 1.8V is supported by family members at reduced clock rates, per AVR505 application note on migration between ATmega16/32 and ATmega164P/324P/644P. Typical applications include industrial control panels, sensor acquisition nodes, embedded instrumentation, serial-protocol bridges using the dual USART, and hobby/education platforms that keep large installed firmware bases alive. A key design consideration: Microchip lists the ATmega644P as a mature product not recommended for new designs, replaced by the pin-compatible ATmega644PA; new boards should target the PA while service designs can continue with this part. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA644P-20PQ

ATMEGA644P-20PQ - 8-bit AVR MCU 20MHz 64KB Flash DIP-40 | Microchip

The Microchip Technology ATMEGA644P-20PQ is a high-performance, low-power 8-bit AVR ATmega microcontroller delivering 20MHz maximum clock speed, 64KB of In-System Programmable Flash, 4KB SRAM and 2KB EEPROM, housed in a 40-pin PDIP package rated for the extended temperature range. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, achieving throughputs close to 1 MIPS per MHz. Within the power management and embedded control hierarchy, the ATmega family sits in the mid-range segment between the small ATmega48/328 devices and the larger ATmega1284/2560 parts, making it a common choice for self-contained embedded systems that need substantial Flash without moving to 32-bit architectures. Key features include the AVR enhanced RISC architecture with 131 powerful instructions, two on-chip UARTs (the P suffix denotes the dual-UART variant with a second USART), an internal RC oscillator, 32 general-purpose I/O lines, and JTAG for on-chip debugging and boundary scan. The device operates from 2.7V to 5.5V, with 20MHz operation specified at 4.5V to 5.5V, and it supports In-System Programming (ISP) as well as self-programming via a boot loader section. The picoPower CMOS process gives the family flexible power management: idle, power-down, power-save, standby, and extended standby sleep modes allow the system designer to trade processing speed directly against power consumption, a capability Atmel documented as achieving close to 1 MIPS per MHz throughput efficiency. Typical applications include industrial control panels, test fixtures and instrumentation where the 40-pin DIP package simplifies prototyping and socketed replacement, educational and hobby platforms, and legacy system maintenance where through-hole technology is required. A key design consideration: Microchip lists this mature device as not recommended for new designs and replaced by ATmega644PA, so new products should target the PA variant, while this part remains useful for maintaining existing socketed designs. This page synthesizes verified distributor data, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, with pricing references as of 2026-09-18.

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ATMEGA644P-20PU

ATMEGA644P-20PU - 8-bit AVR MCU 20MHz 64KB Flash | Microchip

The Microchip Technology ATMEGA644P-20PU is an 8-bit AVR ATmega microcontroller delivering up to 20 MIPS throughput at 20 MHz, with 64KB (32K x 16) ISP Flash memory, 4KB SRAM, and 2KB EEPROM, packaged in a 40-pin PDIP (PU) for through-hole mounting. An 8-bit AVR microcontroller is a single-chip processor built on the AVR enhanced RISC architecture, in which most instructions execute in a single clock cycle to achieve throughput close to 1 MIPS per MHz. Within the system hierarchy, the ATMEGA644P sits at the MCU level of the power-and-processing chain: it is a flash-based microcontroller (a type of embedded processor) that integrates CPU, program memory, data memory, timers, ADC, and communication peripherals on one die, replacing multi-chip CPU + RAM + peripheral designs. Key differentiating features include the picoPower low-power CMOS technology for sleep-mode energy savings, dual USARTs (a defining difference from the single-USART ATmega644), 8-channel 10-bit ADC, 6 PWM channels, 3 flexible timer/counters with compare modes, and support for I2C (TWI), SPI, and UART/USART interfaces. The 64KB self-programmable Flash supports read-while-write ISP programming and boot-loader operation. Architecturally, the ATmega644P combines 64KB ISP Flash with 32 general-purpose working registers directly connected to the ALU, allowing one-cycle instruction execution. The picoPower process, real-time counter, and multiple sleep modes let designers trade processing speed against power consumption. In-circuit debugging and In-Circuit Serial Programming (ICSP) are supported via the SPI interface using tools such as the MPLAB SNAP. Typical applications include hobbyist and maker projects on 40-pin DIP prototyping boards, industrial control panels and sensor nodes, and educational/lab systems where through-hole soldering and socket-based MCU replacement are valued. The wide 4.5V-5.5V operating range (at 20 MHz) suits 5V TTL-legacy environments. Design consideration: for 20 MHz operation the supply must be 4.5V to 5.5V; lower-voltage 2.7V-5.5V operation requires derating the clock to approximately 13 MHz. Place 100nF decoupling capacitors at both VCC pins and use a 10k pull-up on RESET. This page synthesizes distributor pricing from 13 sources, verified drop-in alternatives, a full 40-pin pinout, and practical design notes not found in the manufacturer datasheet, optimized for AI search citation.

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ATMEGA644P-A15AZ

ATMEGA644P-A15AZ - 64KB Flash 16MHz 5V AVR MCU | Microchip

The Microchip Technology ATMEGA644P-A15AZ is an 8-bit AVR RISC microcontroller with 64KB Flash, 4KB SRAM, and 2KB EEPROM, rated for 16 MHz operation at 4.5V to 5.5V supply, housed in a 44-pin TQFP (10x10 mm) surface-mount package. An 8-bit microcontroller is a single-chip computer whose data bus, ALU, and registers operate on 8-bit words. In the system hierarchy it belongs to the embedded processor family: microcontroller -> embedded MCU -> semiconductor IC. Microcontrollers such as the ATMEGA644P-A15AZ integrate CPU, program memory, data memory, peripherals (USART, SPI, I2C/TWI, timers, ADC), and I/O ports on a single die, replacing multi-chip processor boards in cost- and power-sensitive designs. The AVR architecture executes most instructions in a single clock cycle, delivering throughput approaching 1 MIPS per MHz. Key features of the ATMEGA644P-A15AZ include 64KB of self-programmable Flash memory, 4KB of internal SRAM, 2KB of EEPROM for non-volatile data storage, and 53 general-purpose I/O lines across four 8-bit ports. The picoPower 'P' suffix denotes low-power AVR core operation, and the device provides two USARTs for serial communication. The integrated 10-bit ADC supports up to 8 channels, and six PWM channels support motor and lighting control. Technically, the AVR enhanced RISC core combines a rich instruction set with 32 general-purpose working registers, all directly connected to the ALU, allowing two independent registers to be accessed in one instruction executed in one clock cycle. The A15AZ speed-grade marking is characterized at 5V and 16 MHz across the -40C to +85C (or +105C) automotive temperature range, satisfying AEC-Q100 stress-test requirements as evidenced by the 'AZ' suffix and the automotive qualification trail documented on the Microchip product page. Typical applications include industrial control and automation nodes, embedded instrumentation and data loggers, automotive body and chassis subsystems, and consumer appliance control boards, where the 5V-tolerant I/O and 53 I/O lines simplify direct connection to sensors, keypads, displays, and actuators without level shifting. Design consideration: the ATMEGA644P-A15AZ is specified for a 4.5V to 5.5V supply; designs targeting 3.3V operation must instead select the picoPower ATMEGA644PA family or a low-voltage variant, since this A15AZ speed-grade part is characterized at 5V and 16 MHz. Microchip lists the ATmega644P family as a mature product, not recommended for new designs, replaced by the ATmega644PA. This page synthesizes distributor stock and pricing signals, drop-in alternative cross-references from verified web data, and practical design guidance not found in the manufacturer datasheet alone, providing engineers a single decision-ready resource.

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ATMEGA644P-A15MZ

ATMEGA644P-A15MZ - 64KB AVR MCU, 16MHz, VQFN-44 | Microchip

The Microchip Technology ATMEGA644P-A15MZ is an 8-bit AVR RISC microcontroller with 64KB ISP flash, 4KB SRAM, and 2KB EEPROM, operating at up to 16 MHz from a 4.5V to 5.5V supply in a 44-pin VQFN (7x7 mm) package. This automotive-grade variant is compliant with AEC-Q100 and targets vehicular and industrial applications. An 8-bit AVR microcontroller is a complete computer-on-a-chip built around the AVR RISC core, combining program memory, data memory, timers, serial interfaces, and an ADC in a single IC. Within the power-management-free MCU hierarchy, it sits below 32-bit MCUs and above small 8-bit parts like the ATmega328, making it a mid-range embedded processor for control tasks. Key features include dual USARTs for two independent serial links, an 8-channel 10-bit ADC for analog sensing, and a byte-oriented TWI (I2C) interface plus SPI for peripherals. 32 general-purpose I/O lines and three flexible timers with compare modes and PWM support motor control and LED driving. In-system programmability with read-while-write flash allows firmware updates on the final product. The AVR architecture executes most instructions in a single clock cycle, delivering up to 16 MIPS throughput at 16 MHz. Harvard-architecture separate program and data buses, 32 general-purpose working registers, and a rich interrupt structure provide deterministic real-time behavior valued in automotive body electronics and industrial automation. JTAG and debugWIRE-style debug access simplifies software bring-up. Typical applications include automotive body control modules, industrial sensor nodes, HVAC controllers, and motor-driven appliances. The dual USART and 10-bit ADC make it a fit for gateway nodes bridging analog sensors to serial networks. When designing with this part, budget the 4KB SRAM carefully - stack, heap, and buffers share it - and use the brown-out detector plus watchdog timer for robust operation in electrically noisy vehicle environments. This page synthesizes distributor pricing from LCSC and DigiKey, drop-in alternatives within the ATmega644P/644PA family, and practical design notes not found in the manufacturer datasheet.

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ATMEGA644PA-ANR

ATMEGA644PA-ANR - 8-bit AVR MCU 64KB Flash 44-TQFP | Microchip

The Microchip Technology ATMEGA644PA-ANR is a high-performance, low-power 8-bit AVR RISC microcontroller featuring 64 KB of ISP Flash memory with read-while-write capability, 2 KB EEPROM, 4 KB SRAM, and 32 general purpose I/O lines, housed in a 44-pin TQFP (10x10 mm) package. A microcontroller (MCU) is a single integrated circuit that combines a processor core, memory, and programmable peripherals into one chip, forming the heart of embedded systems. The ATmega family sits within the broader hierarchy of 8-bit microcontrollers, part of Microchip's AVR line, which is widely used in industrial control, consumer devices, and hobbyist electronics. picoPower technology makes this part a member of the low-power MCU class suited for battery-operated designs. Key features include an advanced RISC architecture with 131 powerful instructions, most executing in a single clock cycle, and throughput up to 20 MIPS at 20 MHz. Peripherals include two USARTs, an 8-channel 10-bit ADC, a byte-oriented Two-Wire Interface (TWI/I2C), SPI, three flexible timer/counters with compare modes and PWM, a real-time counter, an on-chip 2-cycle multiplier, and an on-chip debug interface. The picoPower technology supports multiple sleep modes for aggressive power reduction. The ATMEGA644PA-ANR is manufactured in Microchip's high-density nonvolatile memory process, and the ISP Flash can be reprogrammed in-system through the SPI serial interface, by a conventional programmer, or by an on-chip boot program, enabling firmware updates in the field. Verified data lists a 16 MHz speed grade with operation to 105 C and a Tape & Reel (TR) supply format. Typical applications include industrial automation nodes, sensor acquisition systems using the 10-bit ADC, motor control with PWM timers, and embedded communication products using the dual USARTs or TWI bus. A key design consideration: the AVR core is fully static, so clock speed can be scaled down to reduce power, and the internal RC oscillator eliminates an external crystal in non-timing-critical designs. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA644PA-AU

ATMEGA644PA-AU - 8-bit AVR MCU, 20MHz, 64KB Flash | Microchip

The Microchip Technology ATMEGA644PA-AU is a high-performance 8-bit AVR RISC picoPower microcontroller delivering 20 MHz maximum clock frequency, 64 KB ISP Flash memory with read-while-write capability, 4 KB SRAM, and 2 KB EEPROM, housed in a 44-pin TQFP (10x10 mm) package operating from 1.8V to 5.5V. An 8-bit AVR microcontroller is a reduced-instruction-set computing (RISC) device in the microcontroller unit (MCU) hierarchy of embedded processors, integrating a CPU core, program memory, data memory, and peripherals on a single chip. Microcontrollers sit below application processors and above ASICs in the embedded system taxonomy, making them the workhorse of industrial control, consumer devices, and IoT nodes. The AVR family is distinguished by its single-cycle instruction execution through 32 general-purpose working registers, achieving up to 20 MIPS throughput at 20 MHz. Key features include 32 general purpose I/O lines, two USARTs for asynchronous serial communication, a byte-oriented Two-Wire serial interface (TWI/I2C), an SPI serial port, an 8-channel 10-bit ADC with up to 15 kSps throughput, and three flexible timer/counters with compare modes and PWM. The picoPower technology achieves very low power consumption in active and sleep modes, extending battery life in portable designs through six software-selectable power-saving modes. The 64 KB Flash supports In-System Programming (ISP) with read-while-write, enabling firmware field updates without external programmers. The device supports boot loader programming through any interface and operates across 1.8V-5.5V supply range, allowing direct interface with both 3.3V and 5V logic. Peripherals include a real-time counter with separate oscillator, programmable watchdog timer with on-chip oscillator, and JTAG/OCD/debugWIRE on-chip debug interface. Typical applications include industrial control systems, sensor nodes, battery-powered instrumentation, motor control boards using PWM channels, and Arduino-compatible hobby projects where the 644P variant is widely supported. The wide operating voltage also suits solar-powered remote sensing nodes. For design, decouple VCC and AVCC separately with 100 nF ceramic capacitors, and reserve the RESET pin for ISP programming access. The device programs via ICSP using only two I/O pins plus reset. Supply voltage determines maximum safe clock frequency, so verify speed-grade derating at low VCC (10 MHz max at 2.7V). This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not consolidated in the manufacturer datasheet.

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ATMEGA644PA-AUR

ATMEGA644PA-AUR - 8-Bit AVR MCU 64KB Flash 20MHz TQFP-44 | Microchip

The Microchip Technology ATMEGA644PA-AUR is a high-performance 8-bit AVR RISC picoPower microcontroller featuring 64 KB ISP Flash memory with read-while-write capability, 4 KB SRAM, 2 KB EEPROM, and 32 general purpose I/O lines, executing up to 20 MIPS at 20 MHz in a 44-pin TQFP (10x10 mm) package. An 8-bit microcontroller is an integrated circuit that executes program instructions and controls peripherals using an 8-bit-wide CPU data path. Within the embedded systems hierarchy, the ATmega644PA belongs to the AVR ATmega family of flash-based MCUs, which sits under the broader categories of microcontrollers, embedded processors, and semiconductors. Single-cycle instruction execution allows system designers to optimize power consumption versus processing speed, approaching one MIPS per megahertz. Key features include 131 powerful instructions with mostly single-clock cycle execution, 32 general purpose working registers, an on-chip 2-cycle hardware multiplier, and Microchip's picoPower technology for ultra-low sleep-mode current. Peripherals comprise three flexible timer/counters with compare modes and PWM, two USARTs, a byte-oriented Two-Wire serial interface (TWI/I2C), an 8-channel 10-bit ADC, a real-time counter, and SPI for in-system programming. Architecturally, the device uses a Harvard-architecture AVR RISC core with separate program and data buses, enabling read-while-write flash operation and deterministic single-cycle execution. The 64 KB self-programmable ISP flash supports bootloader firmware updates in the field, while the 2 KB EEPROM retains calibration data through power cycles. Typical applications include industrial automation controllers, sensor data loggers, embedded human-machine interfaces, motor control panels, battery-powered instrumentation, and educational/prototyping boards where a large flash map and rich peripheral set are required. A key design consideration is supply voltage: the device operates across the industrial range, so choose clock frequency and BOD (brown-out detector) settings according to the rail used to guarantee margin across temperature. This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA644PA-MNR

ATMEGA644PA-MNR - 8-bit AVR MCU 64KB Flash 20MHz | Microchip

The Microchip Technology ATMEGA644PA-MNR is a high-performance 8-bit AVR RISC microcontroller with 64 KB ISP Flash memory, 4 KB SRAM, 2 KB EEPROM, and 32 general purpose I/O lines, delivered in a 44-pad VQFN (7x7 mm) exposed-pad package on tape and reel. An 8-bit AVR microcontroller is a single-chip processor based on the AVR enhanced RISC architecture, in which most of the 131 powerful instructions execute in a single clock cycle. This gives the ATmega family a throughput approaching 1 MIPS per MHz, allowing system designers to optimize power consumption versus processing speed. Within the embedded processing hierarchy, the ATmega644PA sits in the general-purpose flash MCU class alongside the ATmega164A/324A/1284 family members, all sharing a common core and peripheral set. Key features of the ATMEGA644PA-MNR include read-while-write Flash for reliable in-system self-programming, Microchip's picoPower technology for ultra-low sleep-mode consumption, an internal oscillator that removes the need for an external crystal in many designs, and a rich peripheral set with JTAG for on-chip debugging and boundary scan. The PA suffix denotes the picoPower, low-voltage grade supporting operation down to 1.8 V. Architecturally, the device combines 32 general purpose working registers directly connected to the ALU, allowing two independent registers to be accessed in one instruction, plus hardware multiplier and multiple sleep modes. In-system programmable Flash and support for ICSP via two I/O pins and reset (compatible with MPLAB SNAP and Atmel-ICE tools) simplify manufacturing and field updates. Typical applications include industrial control and automation nodes, sensor acquisition systems, battery-powered portable instruments, and embedded HVAC or building-control boards, where 64 KB of program memory and low active power per MHz are decisive. For design, note that the VQFN exposed pad should be soldered to a ground plane for thermal and signal integrity, and Mouser lists a 105C temperature grade variant so confirm the exact suffix grade against the datasheet. This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA644PA-MU

ATMEGA644PA-MU - 8-bit AVR MCU 64KB 20MHz VQFN-44 | Microchip

The Microchip Technology ATMEGA644PA-MU is a high-performance, low-power 8-bit AVR RISC microcontroller with 64 KB ISP Flash memory (32K x 16), 2 KB EEPROM, 4 KB SRAM, and 32 general purpose I/O lines, housed in a 44-pin VQFN (7x7 mm) package and capable of up to 20 MHz operation (20 MIPS throughput). An 8-bit AVR microcontroller is a single-chip processor built around an advanced RISC core in which most instructions execute in a single clock cycle, yielding approximately 1 MIPS per MHz. Within the power management and embedded control hierarchy, the ATmega family sits as a general-purpose flash microcontroller that integrates program memory, data memory, timers, serial interfaces, and an ADC on one die, replacing multi-chip MCU solutions in cost- and power-sensitive systems. Key features of the ATMEGA644PA-MU include Microchip's picoPower technology for industry-leading low-power consumption, read-while-write Flash for self-programming, two programmable serial USARTs, a byte-oriented Two-Wire serial interface (I2C-compatible), an SPI serial interface, and three flexible timer/counters with compare modes and PWM. An 8-channel 10-bit ADC and a real-time counter (RTC) with a separate oscillator round out the peripheral set. The advanced RISC architecture provides 131 powerful instructions, fully static operation, 32 x 8 general purpose working registers, and an on-chip 2-cycle hardware multiplier. In-system programmable (ISP) Flash with high endurance non-volatile memory segments supports field firmware updates, while the enhanced power-save modes make the part well suited to battery-powered designs. Typical applications include industrial control and automation, sensor and data-logging nodes, consumer appliances, and battery-operated metering or monitoring products where 64 KB of program memory, rich peripherals, and low active/sleep current are required. A key design consideration: the picoPower ATMEGA644PA achieves its lowest sleep currents only when unused peripherals and clock sources are disabled, and the 44-VQFN exposed pad should be soldered to a ground plane for thermal and signal-integrity performance. This page synthesizes distributor availability, drop-in alternatives within the ATmega164A/324A/644A/1284 family, and practical design notes not found in the manufacturer datasheet. Pricing shown is estimated; verify current distributor pricing as of 2026-09-18 before ordering.

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ATMEGA644-20PU - 8-bit AVR MCU 64KB 20MHz DIP-40 | Microchip

ATMEGA644A-AU - 8-bit AVR MCU 20MHz 64KB Flash | Microchip

ATMEGA644A-AUR - 8-bit AVR MCU 64KB Flash 20MHz TQFP-44 | Microchip

ATMEGA644A-MUR - 8-bit AVR MCU 64KB Flash 20MHz | Microchip

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ATMEGA644P-15MT - 8-bit AVR MCU, 64KB Flash, 44-VQFN | Microchip

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ATMEGA644P-20MQR - 8-Bit AVR MCU 20MHz 64KB | Microchip

ATMEGA644P-20MU - 8-bit AVR MCU 20MHz 64KB Flash | Microchip

ATMEGA644P-20PQ - 8-bit AVR MCU 20MHz 64KB Flash DIP-40 | Microchip

ATMEGA644P-20PU - 8-bit AVR MCU 20MHz 64KB Flash | Microchip

ATMEGA644P-A15AZ - 64KB Flash 16MHz 5V AVR MCU | Microchip

ATMEGA644P-A15MZ - 64KB AVR MCU, 16MHz, VQFN-44 | Microchip

ATMEGA644PA-ANR - 8-bit AVR MCU 64KB Flash 44-TQFP | Microchip

ATMEGA644PA-AU - 8-bit AVR MCU, 20MHz, 64KB Flash | Microchip

ATMEGA644PA-AUR - 8-Bit AVR MCU 64KB Flash 20MHz TQFP-44 | Microchip

ATMEGA644PA-MNR - 8-bit AVR MCU 64KB Flash 20MHz | Microchip

ATMEGA644PA-MU - 8-bit AVR MCU 64KB 20MHz VQFN-44 | Microchip