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ATMEGA325A-ANR - 8-bit AVR MCU 32KB 20MHz TQFP-64 | Microchip
ATMEGA325A-ANR

ATMEGA325A-ANR - 8-bit AVR MCU 32KB 20MHz TQFP-64 | Microchip

The Microchip Technology ATMEGA325A-ANR is a high-performance, low-power 8-bit AVR RISC microcontroller with 32KB ISP Flash memory, 2KB SRAM, and 1KB EEPROM, executing at up to 20MHz and housed in a 64-pin TQFP (14x14 mm) package with 54 general-purpose I/O lines. An 8-bit microcontroller (MCU) is a single-chip computer integrating a processor core, program memory, data memory, and peripherals on one die. Within the power-management and embedded-system hierarchy, the AVR ATmega family sits in the general-purpose MCU category, competing with PIC16 and other 8-bit families while offering the AVR advanced RISC architecture with 130 mostly single-cycle instructions. Key features include 32KB of in-system-programmable Flash with read-while-write capability, 1KB EEPROM for non-volatile data storage, 54 general-purpose I/O lines, 32 general-purpose working registers, an internal oscillator, and JTAG boundary-scan/debug support. The 20MHz maximum clock rate delivers roughly 20 MIPS of throughput, and the -40C to +105C operating range of the AN suffix grade suits industrial environments. Technically, the ATmega325A uses the AVR enhanced RISC pipeline, where most instructions execute in a single clock cycle, and Harvard architecture separates program and data buses for parallel access. The A-suffix silicon is a manufacturing-process refresh of the original ATmega325; per Microchip application note AVR540, it is a functionally identical, drop-in replacement that passes the same qualification and production tests, though some electrical characteristics differ because of the process change. Typical applications include industrial control panels, sensor and instrumentation front ends, building automation nodes, and consumer appliances where the 54-I/O count, 10-bit ADC-class peripherals, and 105C rating provide headroom. The 64-TQFP (14x14 mm) footprint also makes it a natural upgrade path from 40-pin ATmega designs. When designing with this device, verify the 20MHz rating against your supply voltage and temperature corner, and follow Microchip application note AVR042 for hardware design: decouple VCC/AVCC with 100nF ceramics, route RESET with a pull-up, and respect JTAG enable fuse behavior on PCB layouts that share JTAG pins with port C. This page synthesizes distributor pricing, verified drop-in alternatives, pinout guidance, and practical design notes not found in the manufacturer datasheet, giving engineers and buyers a single decision-ready reference for the ATMEGA325A-ANR.

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ATMEGA325A-AU - AVR 8-bit MCU 32KB Flash 20MHz 64TQFP | Microchip
ATMEGA325A-AU

ATMEGA325A-AU - AVR 8-bit MCU 32KB Flash 20MHz 64TQFP | Microchip

The Microchip Technology ATMEGA325A-AU is an 8-bit AVR RISC microcontroller with 32 KB In-System Programmable Flash, 2 KB SRAM, 1 KB EEPROM, and a 20 MHz maximum clock frequency, housed in a 64-pin TQFP (14 x 14 mm, 0.8 mm pitch) surface-mount package for industrial temperature ranges. An 8-bit AVR microcontroller is a single-chip computer built around the Harvard-architecture AVR RISC core, in which program memory and data memory use separate buses, allowing most of its 131 powerful instructions to execute in a single clock cycle. Within the semiconductor hierarchy it sits below general-purpose microprocessors and above simple logic ICs, serving as the complete processing element in embedded power management, control, and human-interface systems. Key features include the 20 MHz AVR core delivering up to 20 MIPS throughput, read-while-write ISP Flash for field firmware updates, 1 KB of non-volatile EEPROM for calibration data retention through power cycles, and 54 general-purpose I/O lines per the Microchip product page. A JTAG interface (JTA per Microchip) supports on-chip debugging and boundary-scan testing, and 32 general-purpose working registers give the compiler direct register access that keeps interrupt latency low. Technically, the ATmega325A is the process-migrated A-variant of the original ATmega325: according to the Microchip application note AVR540, the A-version is a functionally identical, drop-in replacement for the ATmega325, qualification-tested identically, with minor electrical characteristic differences due to the new fabrication process. The AVR architecture combines single-cycle ALU operation with a two-stage pipeline, which is why the effective MIPS rating equals the clock frequency in MHz. Typical applications include industrial control panels and automation nodes, metering and instrumentation front ends, and embedded systems that need dependable 5 V operation across wide temperature ranges. For design, remember that the full 20 MHz speed grade applies at the higher supply voltage range; derate the maximum clock when operating at reduced VCC, and budget EEPROM endurance for data that changes frequently. This page synthesizes distributor listings, the Microchip AVR540 migration note, drop-in family alternatives, and practical design guidance not found on standard datasheet pages.

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ATMEGA325A-AUR - 32KB Flash 20MHz 8-Bit AVR MCU | Microchip
ATMEGA325A-AUR

ATMEGA325A-AUR - 32KB Flash 20MHz 8-Bit AVR MCU | Microchip

The Microchip Technology ATMEGA325A-AUR is an 8-bit AVR RISC microcontroller with 32 KB ISP Flash memory, 2 KB SRAM, 1 KB EEPROM and a maximum clock frequency of 20 MHz, housed in a 64-pin TQFP (14x14 mm) package. The A-generation die operates from a 1.8V to 5.5V supply and provides 54 general purpose I/O lines. A microcontroller (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals such as timers, UARTs, and ADCs on one die. Within the embedded systems hierarchy, the ATMEGA325A belongs to the AVR ATmega family of general-purpose 8-bit microcontrollers, which sit alongside 16-bit and 32-bit MCUs in Microchip's portfolio and are widely used for cost-sensitive embedded control. Key features include the AVR Advanced RISC architecture executing 131 powerful instructions, most in a single clock cycle; 32 general purpose working registers; in-system self-programmable Flash with read-while-write capability; a 10-bit ADC; and JTAG boundary-scan and on-chip debugging. These attributes deliver deterministic real-time performance and simple single-voltage flash programming without a dedicated high-voltage programmer. Technically, the ATMEGA325A integrates two 8-bit timers/counters, one 16-bit timer with input capture, two USARTs, an SPI master/slave interface, a TWI (I2C-compatible) interface, an analog comparator, and an 8-channel 10-bit ADC with an internal bandgap reference. The A-die is manufactured on Microchip's newer process and is documented in AVR540 as a functionally identical, drop-in replacement for the original ATmega325, subject to identical qualification and production testing, with minor electrical characteristic differences from the process change. Typical applications include industrial control panels, building automation nodes, medical instrument front ends, and metering products that need the 64-TQFP I/O count, JTAG debugging, and 5V-tolerant industrial operation the ATmega325A provides. A key design consideration is clock-frequency versus voltage: 20 MHz operation requires VCC near 5V, while battery designs running at 1.8V must derate maximum clock speed per the AVR frequency-versus-voltage curve. This page synthesizes distributor pricing, verified drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet.

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ATMEGA325A-MN - 8-bit AVR MCU 32KB Flash 20MHz QFN-64 | Microchip
ATMEGA325A-MN

ATMEGA325A-MN - 8-bit AVR MCU 32KB Flash 20MHz QFN-64 | Microchip

The Microchip Technology ATMEGA325A-MN is a high-performance, low-power 8-bit AVR RISC microcontroller with 32KB ISP Flash memory, 2KB SRAM, 1KB EEPROM, and up to 20MHz operation, housed in a 64-pin VQFN/MLF (9x9 mm) exposed-pad package. A microcontroller (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals such as timers, USART, SPI, and ADC on one die. Microcontrollers form the foundation of embedded systems, sitting at the lowest level of the computing hierarchy above discrete logic and below application processors. The AVR ATmega family from Microchip (formerly Atmel) is one of the most widely deployed 8-bit MCU families in industrial and consumer electronics. Key features of the ATMEGA325A include 130 powerful RISC instructions, most executing in a single clock cycle, 32 general-purpose working registers, read-while-write Flash for in-system self-programming, an on-chip JTAG interface for boundary-scan and on-chip debugging, and 54 general-purpose I/O lines in the 64-pin package. The internal RC oscillator removes the need for an external crystal in many designs, while the enhanced peripherals include an 8-channel 10-bit ADC, USART, SPI, and two 8-bit plus two 16-bit timers with PWM. The ATMEGA325A is fabricated on an updated process relative to the original ATmega325; per Microchip application note AVR540, it is a functionally identical drop-in replacement for the ATmega325, though some electrical characteristics differ because of the new process. A 105C temperature grade (MN suffix) suits industrial environments. Typical applications include industrial control panels, building automation nodes, consumer appliances, LED lighting controllers, and instrumentation front ends where the 10-bit ADC, rich timer complement, and generous 54 I/O count allow single-chip designs. When designing, keep the 20MHz clock ceiling in mind - derating the clock allows lower-voltage operation for battery-powered products, following the standard AVR speed-versus-voltage curves. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA325A-MNR - 8-bit AVR MCU 20MHz 32KB Flash 64-QFN | Microchip
ATMEGA325A-MNR

ATMEGA325A-MNR - 8-bit AVR MCU 20MHz 32KB Flash 64-QFN | Microchip

The Microchip Technology ATMEGA325A-MNR is an 8-bit AVR RISC microcontroller with 32 KB ISP Flash memory, 2 KB SRAM, 1 KB EEPROM, and a 20 MHz maximum clock frequency, housed in a 64-pin QFN (9x9 mm) package with exposed pad. It executes most instructions in a single clock cycle, delivering up to 20 MIPS throughput at 20 MHz. An 8-bit AVR microcontroller is a Harvard-architecture processor that separates program memory (Flash) from data memory (SRAM), allowing the CPU to fetch instructions and data simultaneously. MCUs of this class sit at the center of embedded system design, integrating CPU, memory, timers, communication peripherals, and analog functions on a single chip, replacing multi-chip discrete solutions in cost- and space-sensitive products. Key features of the ATMEGA325A include 54 general-purpose I/O lines, 32 general-purpose working registers, JTAG for on-chip debugging and boundary scan, and read-while-write Flash capability that allows firmware self-programming. The A-variant is Microchip's refresh of the original ATmega325 with improved speed and power characteristics while retaining full code compatibility. The AVR core combines a rich instruction set with single-cycle execution, and the integrated peripheral set typically includes 8-bit and 16-bit timers with PWM outputs, a 10-bit ADC, USART serial port, and SPI-compatible interface, enabling compact designs for sensing, control, and communication tasks without external companion ICs. Typical applications include industrial control panels, consumer appliances, battery-powered instrumentation, and building automation nodes, where the combination of 32 KB program space, in-system programmability, and wide availability makes the ATMEGA325A a dependable main controller. When designing with this device, verify the operating voltage range and detailed peripheral specifications against the official Microchip datasheet, and use the JTAG interface for production debugging. Account for the exposed-pad QFN footprint in PCB layout for grounding and thermal relief. This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA325A-MU - 8-bit AVR MCU 32KB 20MHz 64-QFN | Microchip
ATMEGA325A-MU

ATMEGA325A-MU - 8-bit AVR MCU 32KB 20MHz 64-QFN | Microchip

The Microchip Technology ATMEGA325A-MU is an 8-bit AVR RISC microcontroller with 32 KB In-System Programmable Flash, 2 KB SRAM, 1 KB EEPROM, and a maximum clock frequency of 20 MHz, housed in a 64-pin QFN (9x9 mm) package with exposed pad. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, sitting within the broader hierarchy of microcontroller units (MCUs) embedded processors used to control a single function inside an electronic system. AVR MCUs from Microchip (originally Atmel) are widely used for their simplicity, low power, and rich peripheral integration on a single chip. Key features of the ATmega325A include 54 general purpose I/O lines, 32 general purpose working registers, in-system programmable Flash with read-while-write capability, a JTAG interface for on-chip debugging and boundary scan, and an incremental 10-bit ADC. The single-cycle execution model delivers up to 20 MIPS throughput at 20 MHz, allowing C-compiled code to approach the efficiency of 8-bit assembly. The AVR core combines a rich instruction set with 32 general purpose registers directly connected to the ALU, eliminating the accumulator bottleneck of classic 8051-style designs. Peripheral set includes USART, SPI, and two-wire (I2C-compatible) interfaces, plus multiple 8-bit and 16-bit timers with PWM outputs, enabling motor control, lighting, and communication tasks without external logic. Typical applications include industrial control panels and instrumentation, consumer appliances and HVAC controls, and battery-powered meters where the low-power idle and power-down modes extend battery life while 32 KB of Flash comfortably hosts protocol stacks and UI code. For design, use the industrial temperature grade range of the -MU suffix (-40C to +85C) and verify supply-voltage versus frequency derating from the manufacturer datasheet when operating near 20 MHz at low VCC. Keep decoupling capacitors close to the multiple VCC/GND pairs of the 64-QFN exposed-pad package. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, with pricing as of 2026-09-17.

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ATMEGA325A-MUR - 8-bit AVR MCU 32KB 20MHz 64-QFN | Microchip
ATMEGA325A-MUR

ATMEGA325A-MUR - 8-bit AVR MCU 32KB 20MHz 64-QFN | Microchip

The Microchip Technology ATMEGA325A-MUR is a high-performance, low-power 8-bit AVR RISC microcontroller with 32 KB ISP Flash memory, 1 KB EEPROM, 2 KB SRAM, and up to 20 MHz clock speed, housed in a 64-pin QFN (9x9 mm) package with exposed pad on tape and reel. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle. Within the power-management hierarchy, it functions as a complete embedded system-on-chip, integrating the CPU core, program memory, data memory, peripherals, and general-purpose I/O on one die, replacing multi-chip microprocessor solutions in cost- and power-sensitive designs. Key features include the AVR advanced RISC architecture with 131 powerful instructions, 54 general-purpose I/O lines, and in-system programmable (ISP) Flash with read-while-write capability for field firmware updates. The ATmega325A family operates from 2.5V, 3.3V, or 5V supplies, giving designers flexibility across battery-powered and industrial 5V rails. Technically, the device provides 32 general-purpose working registers, a one-cycle multiply instruction, SPI and UART/USART serial interfaces, and an on-chip JTAG (IEEE 1149.1 compatible) boundary-scan and debug interface. Peripheral set includes an 8-channel 10-bit ADC, timer/counters with PWM, and an on-chip oscillator option, reducing external component count and BOM cost. Typical applications include industrial control panels, LCD-equipped metering and instrumentation, consumer appliance controllers, and battery-powered monitoring nodes where the combination of 32 KB Flash and low-power sleep modes directly improves battery life and firmware headroom. When designing with the ATMEGA325A-MUR, match the supply voltage to the intended maximum clock frequency per the frequency-voltage curve in the manufacturer datasheet to ensure timing margin across the -40C to +85C industrial temperature range. This page synthesizes distributor pricing, verified drop-in alternatives, pinout guidance, and practical design notes not found in the standard manufacturer datasheet, optimized for AI-assisted component selection.

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ATMEGA325P-20AUR - 8-bit AVR MCU 32KB 20MHz | Microchip
ATMEGA325P-20AUR

ATMEGA325P-20AUR - 8-bit AVR MCU 32KB 20MHz | Microchip

The Microchip Technology ATMEGA325P-20AUR is a picoPower 8-bit AVR microcontroller with 32 KB self-programming Flash, 2 KB SRAM, 1 KB EEPROM, an 8-channel 10-bit ADC, and up to 20 MIPS throughput at 20 MHz, housed in a 64-pin TQFP (14x14 mm) package. It operates from 1.8 V to 5.5 V and is rated for industrial temperature ranges. An 8-bit AVR microcontroller is a single-chip computer that integrates a RISC processor core, program memory, data memory, peripherals, and I/O on one die. Within the power-management hierarchy, MCUs such as the ATmega325P sit at the top of embedded control systems, executing user firmware that orchestrates sensors, actuators, displays, and communication interfaces in everything from household appliances to industrial instruments. Key features include the Advanced RISC architecture with 131 powerful instructions, most executing in a single clock cycle; 32 KB of in-system programmable (ISP) Flash supporting self-programming for field firmware updates; JTAG interface for on-chip debugging and boundary scan; and picoPower technology for ultra-low sleep-mode consumption. The 8-channel 10-bit ADC enables direct analog sensor interfacing without external converter ICs. The ATmega325P executes up to 20 MIPS at 20 MHz, with fully static operation allowing clock frequencies down to DC for aggressive power saving. The P-suffix denotes the picoPower generation, which adds improved sleep modes (Idle, ADC Noise Reduction, Power-save, Power-down, Standby, Extended Standby) compared with the earlier ATmega325. The 64-pin TQFP exposes 54 general-purpose I/O lines, giving ample pin budget for keypad matrices, LCD segments, and parallel peripherals. Typical applications include industrial control panels, battery-powered metering instruments, consumer appliance controllers, and building automation nodes where 5 V logic compatibility and mature AVR tooling simplify design. When designing with this part, budget the 2 KB SRAM carefully - large buffers or RTOS stacks can overflow quickly on an 8-bit part - and use the picoPower sleep modes with watchdog wake-ups to extend battery life in duty-cycled systems. This page synthesizes verified distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet, providing engineers and buyers a single AEO-optimized reference for the ATMEGA325P-20AUR.

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ATMEGA325P-20MU - 8-bit AVR MCU 32KB 20MHz 64-QFN | Microchip
ATMEGA325P-20MU

ATMEGA325P-20MU - 8-bit AVR MCU 32KB 20MHz 64-QFN | Microchip

The Microchip Technology ATMEGA325P-20MU is a picoPower 8-bit AVR RISC microcontroller with 32 KB self-programming Flash, 2 KB SRAM, 1 KB EEPROM, and 20 MIPS throughput at 20 MHz, housed in a 64-pin VFQFN (9x9 mm) package with exposed pad. A microcontroller unit (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals such as ADCs, timers, and communication interfaces. Within the semiconductor hierarchy, the ATmega325P belongs to the AVR ATmega family of 8-bit MCUs, positioned above small AVR tinyAVR parts and below 32-bit ARM-based MCUs in complexity, and serves as the central control element in embedded systems. Key features include an advanced RISC architecture with 131 powerful instructions, most executing in a single clock cycle; an 8-channel 10-bit ADC; a JTAG interface for on-chip debugging; and In-Circuit Serial Programming (ICSP) for field updates. The picoPower technology delivers low active and sleep current, making the P-variant more efficient than the earlier non-P ATmega325. Technically, the ATmega325P executes up to 20 MIPS at 20 MHz, and the -20 speed suffix requires a 4.5 V to 5.5 V supply, while the wider AVR ATmega family supports 1.8 V to 5.5 V operation at reduced clock rates. Self-programming Flash enables bootloaders, and 1024 bytes of EEPROM retain calibration data through power cycles. Typical applications include industrial control panels, consumer appliance control, sensor data loggers, and low-cost instrumentation where a 5 V logic environment and mature AVR tooling are preferred. For design, remember that a 20 MHz clock requires the 5 V supply range; below 4.5 V the maximum safe clock frequency drops, so derate the crystal accordingly. Use the JTAG header or MPLAB SNAP for on-chip debug during development. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA325P-20MUR - 8-bit AVR MCU 32KB 20MHz 64-QFN | Microchip
ATMEGA325P-20MUR

ATMEGA325P-20MUR - 8-bit AVR MCU 32KB 20MHz 64-QFN | Microchip

The Microchip Technology ATMEGA325P-20MUR is an 8-bit AVR ATmega microcontroller with 32 KB self-programming In-System-Programmable Flash, 2 KB SRAM, 1 KB EEPROM, an 8-channel 10-bit ADC, and JTAG on-chip debug, executing up to 20 MIPS at 20 MHz in a 64-pin QFN (9x9 mm) exposed-pad package. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that fetches instructions and data over separate buses, allowing most of its 131 instructions to execute in a single clock cycle. Within the power-management hierarchy, the ATmega family sits as a standalone general-purpose MCU, spanning Flash densities from 16 KB to 256 KB and serving as the computing core for embedded control systems that previously required multiple discrete logic ICs. Key features include picoPower technology for extremely low sleep-mode consumption, a wide 1.8V to 5.5V operating range that supports both battery and 5V industrial rails, and 20 MIPS peak throughput at 20 MHz for demanding real-time loops. The P-suffix picoPower grade distinguishes this die from the earlier ATmega325 with lower active and idle current. On-chip JTAG enables boundary-scan, programming, and in-circuit debugging without additional sockets. Architecturally, the device pairs the AVR RISC core with 32 KB of self-programmable Flash organized as 16K x 16, allowing firmware updates in the field through a boot loader section. Peripheral integration includes two 8-bit timers, two 16-bit timers, a USART, SPI, two-wire interface (I2C), analog comparator, and the 8-channel 10-bit ADC with internal bandgap reference. Typical applications include industrial sensor nodes and automation controls leveraging the 1.8V to 5.5V tolerance, battery-powered metering instruments exploiting picoPower sleep modes, and consumer appliances using the ADC plus USART for human-machine interfaces. The 64-pin QFN footprint also suits compact automotive-style HMI panels when paired with the LCD-equipped family siblings. Design consideration: derive the supply rail carefully because the 20 MHz speed grade requires 4.5V to 5.5V operation; at 2.7V the maximum rated clock drops to 10 MHz, so check your frequency-versus-voltage curve before finalizing the crystal selection. This page synthesizes distributor pricing, drop-in same-package alternatives, and design guidance not consolidated in the manufacturer datasheet.

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ATMEGA325PA-AU - 32KB Flash AVR MCU 20MHz TQFP-64 | Microchip
ATMEGA325PA-AU

ATMEGA325PA-AU - 32KB Flash AVR MCU 20MHz TQFP-64 | Microchip

The Microchip Technology ATMEGA325PA-AU is a picoPower 8-bit AVR ATmega microcontroller with 32 KB self-programming Flash, 2 KB SRAM, and 1 KB EEPROM, delivering up to 20 MIPS throughput at 20 MHz in a 64-pin TQFP (14 x 14 mm, 0.8 mm pitch) package. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor in which Flash program memory, SRAM data memory, and EEPROM are integrated on a single chip alongside peripherals, making it the central control element of an embedded system. Within the power-management IC hierarchy, the ATmega family sits at the MCU level of a broader semiconductor taxonomy: microcontroller -> embedded processor -> integrated circuit. The AVR RISC core executes most of its 131 instructions in a single clock cycle, which is why throughput is measured in MIPS equal to clock frequency. Key features include 1.8 V to 5.5 V operation across the full speed range, Microchip picoPower technology for nanoamp-class sleep-mode current, an 8-channel 10-bit ADC, and a JTAG interface supporting on-chip debug and boundary scan. Self-programming Flash enables in-application firmware updates and bootloaders without an external programmer beyond initial ICSP. Technically, the picoPower ATmega325PA improves on the earlier ATmega325P with reduced power consumption in all sleep modes, which matters in battery-powered designs where the MCU spends most of its life in power-down. The AVR core's single-cycle execution and register file of 32 general-purpose working registers keep interrupt latency short and deterministic, valuable in real-time control loops. Typical applications include industrial sensor nodes and HMI front ends, battery-powered meters and data loggers, and hobbyist or commercial embedded controllers requiring 5 V tolerance and legacy AVR tooling compatibility. A key design consideration: maximum safe clock frequency depends on supply voltage - at 5 V the part runs to 20 MHz, but at lower VCC the 20 MHz figure may not be guaranteed across the full data-sheet curve, so verify the frequency-versus-voltage graph in the manufacturer datasheet before over-clocking near the low-voltage end. This page synthesizes distributor pricing, drop-in alternatives within the ATmega325/329/645 family, pinout data, and practical design notes not consolidated in the manufacturer datasheet.

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ATMEGA325PA-AUR - 8-bit AVR MCU 32KB Flash 20MHz | Microchip
ATMEGA325PA-AUR

ATMEGA325PA-AUR - 8-bit AVR MCU 32KB Flash 20MHz | Microchip

The Microchip Technology ATMEGA325PA-AUR is a picoPower 8-bit AVR ATmega microcontroller featuring 32 KB of self-programming In-System Programmable (ISP) Flash program memory, 2 KB SRAM, 1 KB EEPROM, and an 8-channel 10-bit ADC, packaged in a 64-pin TQFP (14x14 mm) supplied on tape and reel. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, positioning itself within the broader hierarchy of microcontroller units (MCUs) under embedded processors and power management systems. The AVR ATmega family is widely used for general-purpose embedded control where in-system programmability, EEPROM data retention, and low-power sleep modes are required. Key features include advanced RISC architecture with 131 powerful instructions, up to 20 MIPS throughput at 20 MHz, JTAG interface for on-chip debugging and boundary-scan, and picoPower technology for ultra-low power consumption in sleep and idle modes. The device operates from 1.8 V to 5.5 V, making it suitable for both battery-powered (3.3 V) and industrial 5 V systems. The picoPower process technology reduces quiescent current in all sleep modes, while the self-programming flash enables field firmware updates over UART, SPI, or the two-wire interface without external programmer hardware in the field. The 8-channel 10-bit ADC supports sensor front-ends, and the rich peripheral set includes USART, SPI, TWI (I2C), and timers with PWM outputs. Typical applications include industrial automation controllers, LCD-equipped metering and user-interface panels, battery-powered instrumentation, and building control nodes where 1.8-5.5 V operation and picoPower sleep currents extend battery life. A key design consideration: maximum clock frequency derates with supply voltage and temperature, so verify the speed-versus-voltage curve before running 20 MHz at reduced VCC in industrial temperature ranges. This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet, with pricing referenced as of 2026-09-17.

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ATMEGA325PA-MUR - 8-bit AVR MCU 32KB 20MHz 64-QFN | Microchip
ATMEGA325PA-MUR

ATMEGA325PA-MUR - 8-bit AVR MCU 32KB 20MHz 64-QFN | Microchip

The Microchip ATMEGA325PA-MUR is a picoPower 8-bit AVR RISC microcontroller with 32 KB self-programming Flash program memory, 2 KB SRAM, 1 KB EEPROM, and up to 20 MIPS throughput at 20 MHz, housed in a 64-pin QFN (MLF) 9x9 mm exposed-pad package. An 8-bit microcontroller integrates a processor core, memory, and peripherals on a single chip, forming the lowest tier of the embedded-processor hierarchy (MCU -> embedded processor -> semiconductor). AVR is a modified Harvard architecture with mostly single-cycle instruction execution, making it a popular alternative to PIC16-class and 8051-class MCUs for cost-sensitive embedded control. Key features include picoPower technology for ultra-low active and sleep current, an 8-channel 10-bit ADC, a JTAG interface for on-chip debugging and boundary scan, and wide 1.8V to 5.5V single-supply operation. The 131-instruction AVR core executes most instructions in a single clock cycle, and 32 general-purpose working registers keep interrupt latency low. Architecturally, the self-programming Flash allows in-system firmware updates via boot-loader code, while the separate EEPROM retains calibration data through power cycles. Advanced power-management modes (idle, power-save, power-down, standby) let designers trade wake-up latency against microamp-level sleep current, a hallmark of the picoPower A-series silicon. Typical applications include industrial sensor nodes, consumer appliance control panels, battery-powered metering, and HVAC/LCD user interfaces where a rich I/O count and ADC channels are required in a compact 9x9 mm footprint. A key design consideration is supply-voltage-dependent maximum clock speed: at 1.8V the safe operating frequency is derated substantially below 20 MHz, so consult the frequency-versus-voltage curve in the manufacturer datasheet before finalizing the oscillator design. This page synthesizes distributor pricing, verified drop-in alternatives within the AVR family, and practical design notes not found in the manufacturer datasheet alone.

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ATMEGA325PV-10AUR - 8-bit AVR MCU 32KB 10MHz | Microchip
ATMEGA325PV-10AUR

ATMEGA325PV-10AUR - 8-bit AVR MCU 32KB 10MHz | Microchip

The Microchip Technology ATMEGA325PV-10AUR is an 8-bit AVR ATmega microcontroller with 32KB flash memory, 2KB SRAM, 1KB EEPROM, and a maximum clock frequency of 10MHz, operating from a supply voltage as low as 1.8V in a 64-pin TQFP (14x14 mm) package supplied on tape and reel. An 8-bit microcontroller is an integrated circuit that executes program instructions on 8-bit-wide data words, combining a processor core, program flash, SRAM, EEPROM, and peripherals on a single chip. Within the power-management hierarchy, an MCU sits at the top of an embedded system, supervising sensors, actuators, displays, and communication interfaces. The AVR architecture uses a RISC load/store design with a two-stage pipeline that executes most instructions in a single clock cycle, delivering high MIPS-per-MHz efficiency. The P suffix in ATMEGA325PV denotes the picoPower technology generation, which reduces power consumption in all sleep modes, while the V suffix indicates a low-voltage operating range down to 1.8V. This makes the device well suited for battery-powered designs where every microamp matters. The 32KB (16K x 16) self-programmable flash supports in-system programming, and the 1KB EEPROM retains calibration and configuration data through power cycles. Peripheral integration includes a 10-bit ADC, USART, SPI, and two-wire serial interfaces, allowing direct attachment of analog sensors and digital peripherals without external glue logic. The industrial temperature rating supports deployment in uncontrolled environments. Typical applications include battery-powered metering, handheld instruments, industrial sensor nodes, and consumer appliance control boards where the low 1.8V operation extends battery life. When designing, budget flash and SRAM carefully: 2KB of SRAM is adequate for state machines and small buffers but not for large frame buffers. This page consolidates distributor pricing, drop-in alternatives, and design notes not found in the manufacturer datasheet.

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ATMEGA325PV-10MU - AVR 8-bit MCU 32KB 10MHz 64-QFN | Microchip
ATMEGA325PV-10MU

ATMEGA325PV-10MU - AVR 8-bit MCU 32KB 10MHz 64-QFN | Microchip

The Microchip Technology ATMEGA325PV-10MU is an 8-bit AVR ATmega microcontroller with 32KB (16K x 16) In-System Programmable Flash, 2KB SRAM, and 1KB EEPROM, executing at up to 10 MHz from a 1.8V to 5.5V supply, housed in a 64-pin QFN (9x9 mm) package with exposed pad. An 8-bit microcontroller is a single-chip computing device that integrates a processor core, program memory, data memory, and peripherals such as timers, UART, SPI, and ADC on one silicon die. The ATmega325P belongs to the AVR ATmega family, itself a subcategory of the broader 8-bit MCU / embedded processor hierarchy within Microchip's microcontroller portfolio, positioned for cost-sensitive embedded control. Key features include the AVR enhanced RISC architecture executing 131 powerful instructions, most in a single clock cycle; 32 general purpose I/O lines across 4 ports; and low-power picoPower-class operation. The device integrates an 8-channel 10-bit ADC, USART, SPI serial interface, and JTAG boundary-scan/debug capability per the AVR ATmega family datasheet. Architecturally, the ATmega325P uses a Harvard structure with separate program and data buses, allowing single-cycle instruction fetch while the previous instruction executes. The 32 x 8 general purpose register file is directly connected to the ALU, giving effective single-cycle throughput near 10 MIPS at 10 MHz. In-system self-programmable Flash enables field firmware updates. Typical applications include industrial control panels, consumer appliances, battery-powered instruments, and sensor front-ends where a 64-pin footprint, 32KB program memory, and industrial temperature grade are required. Design consideration: the 64-QFN exposed pad must be soldered to a ground plane for thermal and signal-integrity performance; verify voltage-frequency derating below 5.5V against the speed grade. This page synthesizes distributor data, drop-in alternatives, comparison tables, and practical design notes not found in the manufacturer datasheet.

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ATMEGA325PV-10MUR - 8-bit AVR MCU 32KB 10MHz | Microchip
ATMEGA325PV-10MUR

ATMEGA325PV-10MUR - 8-bit AVR MCU 32KB 10MHz | Microchip

The Microchip Technology ATMEGA325PV-10MUR is an 8-bit AVR ATmega microcontroller IC delivering 32KB (16K x 16) of In-System-Programmable FLASH, 2KB SRAM, and 1KB EEPROM, running at up to 10 MHz from a 1.8V to 5.5V supply in a 64-pin QFN (9x9 mm) package with exposed pad. An 8-bit microcontroller is a single-chip computer that integrates a CPU core, program memory, data memory, and peripherals such as timers, UART, SPI, and ADC on one silicon die. Within the power-management hierarchy of embedded systems, the microcontroller sits at the top level of control: an MCU such as this AVR device supervises sensors, drives actuators, and manages lower-level power and interface ICs. The AVR ATmega family uses a modified Harvard architecture with single-cycle RISC instruction execution, making it one of the most widely taught and deployed 8-bit controller families in the industry. Key features include the 32KB self-programmable FLASH with boot-code capability, 2KB of internal SRAM for data buffers, and 1KB of non-volatile EEPROM for parameter storage. The low-voltage V-grade operation from 1.8V supports single-cell battery and energy-harvesting designs, while the 10 MHz maximum clock targets low-EMI, low-power applications rather than maximum throughput. The 54 general-purpose I/O lines, USART, SPI, and JTAG debug interface provide full connectivity for industrial designs. Technically, the ATmega325P executes most instructions in a single clock cycle through its pipelined RISC core with 32 general-purpose working registers. The P-suffix denotes the picoPower process generation with reduced leakage, and the V suffix indicates the wide 1.8V-5.5V operating voltage range. Peripherals typically include an 8-channel 10-bit ADC, multiple 8-bit and 16-bit timers with PWM, and on-chip debug via JTAG (per family architecture; refer to the manufacturer datasheet for exact peripheral counts). Typical applications include battery-powered instruments, industrial sensor nodes, building automation controllers, and hand-held metering equipment where wide supply range and mature tool support matter more than raw processing speed. Design consideration: the 64-QFN exposed-pad package requires a well-connected thermal pad for reliable grounding, and V-grade parts must satisfy power-supply derating rules at high clock speeds above the 10 MHz ceiling at reduced VCC. This page synthesizes distributor pricing, drop-in same-family alternatives, pinout guidance, and practical design notes not found in the manufacturer datasheet alone.

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ATMEGA325V-8AI - 8-bit AVR MCU, 32KB Flash, 8MHz, 1.8V | Microchip
ATMEGA325V-8AI

ATMEGA325V-8AI - 8-bit AVR MCU, 32KB Flash, 8MHz, 1.8V | Microchip

The Microchip Technology ATMEGA325V-8AI is an 8-bit AVR RISC microcontroller featuring 32KB (16K x 16) ISP Flash memory with read-while-write capability, 1KB EEPROM, 2KB SRAM, and a maximum clock frequency of 8MHz across a wide 1.8V to 5.5V supply voltage range, housed in a 64-pin TQFP (14x14 mm) industrial-temperature package. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, positioning it within the broader hierarchy of microcontrollers (MCU) and embedded processors. AVR MCUs are widely used for general-purpose embedded control where deterministic execution, low power, and simple tooling matter more than raw compute throughput. Key features of the ATMEGA325V-8AI include 54 general-purpose I/O lines, 32 general-purpose working registers, a JTAG interface for boundary-scan, on-chip debugging, and in-system programming, three flexible Timer/Counters with compare modes, and an on-chip ADC. The V speed grade sustains full 8MHz operation down to low supply voltages, unlike the 16MHz/20MHz grades that require 4.5V or higher. The AVR core combines a rich instruction set with single-cycle ALU operation, delivering up to 8 MIPS at 8MHz. ISP Flash with read-while-write permits firmware updates in the field without halting code execution, and the 1KB EEPROM retains calibration and configuration data through power cycles. The JTAG port supports IEEE boundary-scan test, OCD, and programming through a single connector. Typical applications include battery-powered instruments that exploit the 1.8V operation, industrial automation controllers, and building/HVAC control nodes. The 54 GPIO lines suit panel control, relay driving, and multi-peripheral designs. When designing, remember that the V grade is limited to 8MHz: to run faster you must switch to the P or non-V grades, which requires only a board swap to a same-footprint variant. This page synthesizes distributor availability, same-footprint drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA325V-8MI - 8-bit AVR MCU 32KB Flash 8MHz 64-QFN | Microchip
ATMEGA325V-8MI

ATMEGA325V-8MI - 8-bit AVR MCU 32KB Flash 8MHz 64-QFN | Microchip

The Microchip (Atmel) ATMEGA325V-8MI is an 8-bit AVR RISC microcontroller with 32KB (16K x 16) of In-System Programmable Flash, operating at up to 8MHz across a 1.8V to 5.5V supply range, housed in a 64-pin QFN (9x9 mm) exposed-pad package. The V suffix denotes the wide low-voltage operating range, the 8 suffix denotes the 8MHz maximum clock at 1.8V-5.5V, and the MI suffix denotes industrial temperature qualification for surface-mount assembly. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals on one die. Within the embedded systems hierarchy, the AVR ATmega family sits in the general-purpose microcontroller category alongside Microchip PIC, ST STM8, and NXP 8051 derivatives, serving as the central control element in a larger system that includes power management, sensing, and communication ICs. Key features include the advanced AVR RISC architecture with 130 powerful instructions, most executing in a single clock cycle, which yields throughput close to 8 MIPS at 8MHz and allows efficient C-compiled code. In-System Programmable (ISP) Flash enables firmware update in the final application via the SPI interface without removing the device from the PCB. The low-voltage 1.8V operation suits battery-powered designs, while several power-saving sleep modes reduce average consumption in duty-cycled systems. Architecturally, the AVR core uses a Harvard structure with separate program and data buses, fast register file access, and on-chip peripherals including timers, USART, SPI, and a 10-bit ADC, all clocked from internal RC or external crystal sources. The 64-QFN exposed-pad package provides a compact 9x9 mm footprint with a thermal pad for ground connection and improved heat spreading on the PCB. Typical applications include industrial automation nodes, battery-operated metering and sensing equipment, medical device control boards, and consumer appliance interfaces, where the wide 1.8V-5.5V range and industrial temperature rating provide design margin across real-world supply and environmental conditions. A key design consideration is clock selection versus supply voltage: when operating below 2.7V, the 8MHz limit is conservative and safe, but always verify the frequency-versus-voltage curve in the manufacturer datasheet before raising system clocks near the V-range boundaries. This page synthesizes verified distributor inventory, drop-in family alternatives, and practical sourcing guidance not consolidated in the manufacturer datasheet.

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ATMEGA325V-8MU - 8MHz AVR MCU, 32KB Flash | Microchip
ATMEGA325V-8MU

ATMEGA325V-8MU - 8MHz AVR MCU, 32KB Flash | Microchip

The Microchip Technology ATMEGA325V-8MU is an 8-bit AVR ATmega microcontroller delivering 8 MHz maximum clock speed, 32KB (16K x 16) of In-System Programmable FLASH, 2KB SRAM, and 1KB EEPROM, housed in a 64-pin QFN (9x9 mm) package with exposed pad. The V suffix denotes operation from a 1.8V to 5.5V supply, making it one of the few ATmega MCUs that runs across the full single-cell-lithium to 5V logic range. An 8-bit microcontroller is an integrated circuit that executes embedded control programs using an 8-bit CPU datapath; it belongs to the microcontroller hierarchy of embedded processor -> MCU -> 8-bit AVR family -> ATmega325V. Microcontrollers combine CPU, memory, and peripherals on one die, so a single chip can sense, compute, and drive outputs in embedded systems. Key features include the advanced RISC AVR architecture with 131 powerful instructions, most executing in a single clock cycle, achieving close to 1 MIPS per MHz. Peripherals include an 8-channel 10-bit ADC, USART, SPI, two-wire interface (TWI), two 8-bit timers, one 16-bit timer with RTC capability, and a programmable watchdog timer. Technically, the ATmega325V uses a Harvard architecture with separate program and data buses and in-system programmable (ISP) flash via SPI, supporting bootloader-based field updates. Power management features include idle, ADC noise reduction, power-save, power-down, standby, and extended standby sleep modes for battery designs. Typical applications include battery-powered instrumentation, low-voltage industrial sensors, handheld meters, and consumer control panels where 1.8V operation extends battery life. Design consideration: the 8 MHz speed grade limits compute headroom, so size timing loops and UART baud rates accordingly. This page adds value beyond the manufacturer datasheet with drop-in alternatives, pricing tiers, and design notes.

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ATMEGA325V-8MUR - 8MHz AVR MCU, 32KB Flash, 64-QFN | Microchip
ATMEGA325V-8MUR

ATMEGA325V-8MUR - 8MHz AVR MCU, 32KB Flash, 64-QFN | Microchip

The Microchip Technology ATMEGA325V-8MUR is a low-power 8-bit AVR RISC microcontroller with 32KB of In-System Programmable FLASH (16K x 16), 2KB SRAM, 1KB EEPROM, and a maximum clock frequency of 8 MHz, operating from a 1.8V to 5.5V supply in a 64-pad QFN/MLF (9x9 mm) surface-mount package. An 8-bit AVR ATmega microcontroller is a Harvard-architecture RISC processor that executes most of its 131 instructions in a single clock cycle. Within the power-management hierarchy, it functions as the primary system controller in embedded designs, integrating program memory, data memory, timers, analog-to-digital conversion, and serial communication onto one die, eliminating external controller logic. Key features include the advanced RISC AVR core with 32 general-purpose working registers, up to 54 general-purpose I/O lines (organized as six 8-bit ports), a 10-bit ADC, SPI, UART/USART, and USI serial interfaces, plus brown-out detection, power-on reset, and PWM peripherals. The 'V' grade supports the wide 1.8V to 5.5V operating range for battery-powered designs, while the industrial temperature range covers -40C to +85C. The ATmega325 executes up to 8 MIPS at 8 MHz, using a two-stage pipeline that separates instruction fetch and execution. The self-programming FLASH enables in-system reprogramming, and the EEPROM retains calibration data through power cycles. Multiple sleep modes (Idle, ADC Noise Reduction, Power-save, Power-down, Standby) reduce quiescent current for energy-critical applications. Typical applications include battery-powered instrumentation, industrial sensor nodes and controllers, consumer appliances, and low-voltage handheld devices, where the wide 1.8V supply range directly supports single-cell Li-ion or 2x AA battery architectures. Design consideration: at 5V the maximum guaranteed clock is 8 MHz for this V-grade part; do not clock it at 16 MHz as the standard-grade ATmega325-16 allows. Verify Brown-out Detector threshold against the lowest expected supply voltage. This page adds distributor sourcing data, drop-in alternatives within the ATmega325 family, pricing tiers, and practical design notes not found in the manufacturer datasheet.

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ATMEGA328-AU - 8-bit AVR MCU 20MHz 32KB Flash TQFP-32 | Microchip (Tape & Reel)
ATMEGA328-AU

ATMEGA328-AU - 8-bit AVR MCU 20MHz 32KB Flash TQFP-32 | Microchip (Tape & Reel)

The Microchip Technology ATMEGA328-AU is an 8-bit AVR RISC microcontroller delivering 20 MIPS at 20 MHz, with 32 KB of In-System Programmable Flash, 1 KB EEPROM, 2 KB SRAM, and 23 general-purpose I/O lines, housed in a 32-pin TQFP (7x7 mm) package supplied in tape and reel format. An 8-bit microcontroller (MCU) is a single integrated circuit that combines a processor core, memory, and peripherals such as timers, UART, SPI, and I2C on one die. MCUs sit at the lowest level of the embedded systems hierarchy - below SoCs and application processors - and are the workhorses of industrial control, consumer appliances, and hobbyist platforms such as the Arduino UNO, which made the ATmega328 family the most recognized 8-bit MCU in the world. Key features include the AVR enhanced RISC architecture executing most instructions in a single clock cycle, 32 general-purpose working registers, three flexible timer/counters, a 10-bit ADC with 8 multiplexed channels (6 differential with programmable gain), and hardware USART, SPI, and TWI (I2C) serial interfaces. The device supports both 2.5V to 5.5V operation across its speed grades, enabling battery-powered 3.3V designs as well as 5V industrial rails. Technical depth: the Harvard architecture with separate program and data buses allows single-cycle instruction fetch and execution. In-System Programmable Flash with read-while-write support permits firmware updates in the field via SPI or a bootloader, while independent lock bits protect code IP. Power management includes idle, ADC noise reduction, power-save, power-down, standby, and extended standby modes, plus an on-chip brown-out detector and internal RC oscillator options. Typical applications include Arduino-compatible boards, industrial sensor nodes, motor control panels, HVAC and appliance control, battery monitors, and consumer electronics - anywhere a low-cost, well-supported 8-bit controller with rich analog and serial peripherals is required. Design consideration: decouple VCC/AVCC with 100 nF ceramics close to pins, and remember the TQFP-32 version exposes ADC6 and ADC7 (pins 19 and 22) that the 28-pin DIP variant lacks - useful for extra analog channels. This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet, as of 2026-09-17.

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ATMEGA328-AUR - 8-bit AVR MCU 20MHz 32KB Flash TQFP-32 | Microchip
ATMEGA328-AUR

ATMEGA328-AUR - 8-bit AVR MCU 20MHz 32KB Flash TQFP-32 | Microchip

The Microchip Technology ATMEGA328-AUR is an 8-bit AVR RISC microcontroller delivering 20 MIPS at 20 MHz, with 32 KB of In-System Programmable Flash, 1 KB EEPROM, 2 KB SRAM, and 23 general-purpose I/O lines, housed in a 32-pin TQFP (7x7 mm) package supplied in tape and reel format. An 8-bit microcontroller (MCU) is a single integrated circuit that combines a processor core, memory, and peripherals such as timers, UART, SPI, and I2C on one die. MCUs sit at the lowest level of the embedded systems hierarchy - below SoCs and application processors - and are the workhorses of industrial control, consumer appliances, and hobbyist platforms such as the Arduino UNO, which made the ATmega328 family the most recognized 8-bit MCU in the world. Key features include the AVR enhanced RISC architecture executing most instructions in a single clock cycle, 32 general-purpose working registers, three flexible timer/counters, a 10-bit ADC with 8 multiplexed channels (6 differential with programmable gain), and hardware USART, SPI, and TWI (I2C) serial interfaces. The device supports both 2.5V to 5.5V operation across its speed grades, enabling battery-powered 3.3V designs as well as 5V industrial rails. Technical depth: the Harvard architecture with separate program and data buses allows single-cycle instruction fetch and execution. In-System Programmable Flash with read-while-write support permits firmware updates in the field via SPI or a bootloader, while independent lock bits protect code IP. Power management includes idle, ADC noise reduction, power-save, power-down, standby, and extended standby modes, plus an on-chip brown-out detector and internal RC oscillator options. Typical applications include Arduino-compatible boards, industrial sensor nodes, motor control panels, HVAC and appliance control, battery monitors, and consumer electronics - anywhere a low-cost, well-supported 8-bit controller with rich analog and serial peripherals is required. Design consideration: decouple VCC/AVCC with 100 nF ceramics close to pins, and remember the TQFP-32 version exposes ADC6 and ADC7 (pins 19 and 22) that the 28-pin DIP variant lacks - useful for extra analog channels. This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet, as of 2026-09-17.

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ATMEGA328-MMH - 8-Bit AVR MCU 20MHz 32KB Flash VQFN-28 | Microchip
ATMEGA328-MMH

ATMEGA328-MMH - 8-Bit AVR MCU 20MHz 32KB Flash VQFN-28 | Microchip

The Microchip Technology ATMEGA328-MMH is an 8-bit AVR RISC microcontroller delivering 20 MHz maximum clock frequency, 32 KB ISP Flash memory, and 2 KB SRAM in a 28-pad VQFN (4x4 mm) package with exposed pad. It executes most instructions in a single clock cycle, achieving up to 20 MIPS throughput at 20 MHz. An 8-bit microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and peripherals such as timers, UART, SPI, and I2C on one chip. Within the power-management and embedded-system hierarchy, the MCU sits at the heart of a device, reading sensors, driving actuators, and running the application firmware. The AVR ATmega family from Microchip (originally Atmel) is one of the most widely used 8-bit MCU families in industry and education. Key features include the advanced RISC architecture with 131 powerful instructions and 32 general-purpose working registers, 32 KB of self-programmable Flash with read-while-write support, 1 KB EEPROM for non-volatile data storage, 23 general-purpose I/O lines, and a 10-bit ADC with up to 8 channels (including the dedicated ADC6/ADC7 pads on the VQFN package). Two 8-bit timers, one 16-bit timer, a USART, SPI, and two-wire interface (I2C) round out the peripheral set. Technically, the ATMEGA328-MMH uses a Harvard architecture with separate program and data buses for parallel instruction and data access. It supports six sleep modes for aggressive power reduction, an on-chip debug interface (debugWIRE), and in-system programming via SPI. Supply voltage operation spans 2.5 V to 5.5 V per distributor data, supporting both 3.3 V and 5 V logic systems. Typical applications include industrial control and automation nodes, consumer electronics, robotics, IoT sensor endpoints, and Arduino-compatible embedded designs - the ATmega328 core is the engine of the Arduino Uno platform, giving it unmatched community and toolchain support. A key design consideration: at 20 MHz and 5 V the device is at its maximum rated speed grade, so verify the supply is a clean 5 V; derating the clock to 16 MHz or lower is required for reliable 3.3 V operation. This page synthesizes distributor pricing, drop-in alternatives within the AVR family, pinout data, and practical design notes not found in the manufacturer datasheet.

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ATMEGA328-MMHR - 8-Bit AVR MCU 20MHz 32KB Flash | Microchip
ATMEGA328-MMHR

ATMEGA328-MMHR - 8-Bit AVR MCU 20MHz 32KB Flash | Microchip

The Microchip Technology ATMEGA328-MMHR is an 8-bit AVR RISC microcontroller IC delivering 20 MIPS at 20 MHz, with 32KB of in-system programmable FLASH (16K x 16), 2KB SRAM, and 512B EEPROM, housed in a 28-pin VQFN (4x4 mm, MLF) package with exposed pad. An 8-bit microcontroller is a single-chip processor executing instructions on 8-bit data words, sitting within the broader hierarchy of embedded processors: microcontroller -> embedded processor -> system-on-chip -> semiconductor device. AVR ATmega devices combine a Harvard-architecture RISC CPU with on-chip flash program memory, SRAM data memory, EEPROM, and rich analog/digital peripherals, allowing a complete embedded control system in one package. Key features include the AVR RISC core executing most instructions in a single clock cycle (131 instructions, 32 general-purpose registers), up to 20 MIPS throughput, six-channel 10-bit ADC with 2x differential channels, two 8-bit timers and one 16-bit timer, USART, SPI, and 2-wire (I2C) serial interfaces, plus watchdog timer and on-chip debug capability via debugWIRE. The MMHR suffix denotes the RoHS-green QFN/MLF package supplied in tape and reel for automated assembly. Technically, the ATMEGA328 uses an enhanced AVR core with pipelined single-cycle execution and a Harvard bus structure enabling concurrent program and data access. Self-programmable flash supports in-system programming through SPI and bootloader firmware, while 1.8V to 5.5V operation supports battery designs at reduced clock rates. Sleep modes from idle to power-down minimize average current draw. Typical applications include embedded sensor nodes and IoT endpoints, industrial control and automation interfaces, consumer appliance controls, and the well-known Arduino UNO-class open-source platforms (the 328 family is the classic Arduino MCU). Design consideration: place 100nF decoupling at the VCC pin and ensure the exposed die pad is soldered to a ground pour for thermal and EMI performance; keep XTAL traces short when using an external crystal. This page synthesizes distributor data, drop-in alternatives, 28-pin QFN pinout, and practical design notes not found on the manufacturer product page.

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