Microcontrollers

Products (20,000+)

ATMEGA325-16AU - 32KB Flash 16MHz AVR 8-Bit MCU | Microchip
ATMEGA325-16AU

ATMEGA325-16AU - 32KB Flash 16MHz AVR 8-Bit MCU | Microchip

The Microchip Technology ATMEGA325-16AU is an 8-bit AVR ATmega microcontroller with 32KB (16K x 16) of In-System Programmable FLASH, 16MHz maximum clock speed, and 54 general-purpose I/O pins, housed in a 64-pin TQFP (14x14 mm, 0.8 mm pitch) surface-mount package. A microcontroller unit (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and peripherals into one chip, sitting at the top of the embedded-electronics hierarchy (MCU -> embedded processor -> integrated circuit -> semiconductor). The AVR architecture at the heart of this device is a modified Harvard 8-bit RISC design in which most of the 131 instructions execute in a single clock cycle, delivering up to 16 MIPS throughput at 16MHz. Key features of the ATMEGA325-16AU include 32KB of self-programmable FLASH with 10,000 write-cycle endurance, 1KB of EEPROM for data retention, 2KB of internal SRAM, a 10-bit ADC, UART, SPI, and a watchdog timer. The part operates from a 4.5V to 5.5V supply per the digchip specification listing (the ATmega325 family datasheet documents a 2.7V to 5.5V range for the V variant), with an operating temperature range of -40C to +85C for the industrial grade AU suffix. Architecturally, the device pairs the AVR core with separate program and data buses, fast-register-file access, and single-cycle ALU operations, which is why AVR MCUs achieve high code density and deterministic real-time behavior compared with older CISC 8-bit designs. Typical applications include industrial control panels with LCD interfaces, building automation and HVAC controllers, metering equipment, and hobby/prototyping boards supported by the MegaCore Arduino hardware package. When designing with this MCU, remember that the 16MHz -16 speed grade requires a 4.5V to 5.5V supply; lower-voltage designs must use the V variant and derate clock speed accordingly. This page adds value beyond the datasheet by consolidating distributor pricing, verified drop-in alternatives, design notes, and an engineering-focused FAQ in one AI-citable reference.

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ATMEGA325-16AUR - AVR 8-Bit MCU 32KB 16MHz TQFP-64 | Microchip
ATMEGA325-16AUR

ATMEGA325-16AUR - AVR 8-Bit MCU 32KB 16MHz TQFP-64 | Microchip

The Microchip Technology ATMEGA325-16AUR is an 8-bit AVR RISC microcontroller with 32KB (16K x 16) of In-System-Programmable Flash, 1KB of EEPROM, 2KB of internal SRAM, a 10-class ADC, and a maximum CPU speed of 16MHz at 5V, housed in a 64-pin TQFP (14 x 14 mm) surface-mount package on tape and reel. An 8-bit microcontroller (MCU) is a single integrated circuit that combines a processor core, non-volatile program memory, data RAM, and peripheral functions such as timers, UART serial ports, and analog-to-digital converters. Within the semiconductor hierarchy, the ATMEGA325-16AUR belongs to the AVR ATmega family of enhanced RISC MCUs, which sits inside the broader categories of microcontrollers, embedded processors, and semiconductors. Key features of the ATMEGA325-16AUR include the AVR enhanced RISC architecture executing most instructions in a single clock cycle, which yields throughput of up to 16 MIPS at 16MHz; 32KB of self-programmable Flash organized as 16K x 16 words, supporting 10,000 Flash write cycles; 1KB of EEPROM with a separate lockable boot section capability; and 2KB of on-chip SRAM for data buffering. The integrated ADC allows direct connection of analog sensors without an external converter, reducing bill-of-material cost in measurement applications. The technical architecture follows the classic Harvard model, with separate buses for program and data memory that allow simultaneous instruction fetch and data access. The industrial temperature grade (-40C to +85C per distributor classification) and gull-wing TQFP terminals support automated surface-mount assembly on standard FR4 processes. Typical applications include embedded control in industrial automation nodes, IoT sensor endpoints and gateways, and general-purpose consumer appliance control boards where 32KB of code space and rich I/O are sufficient. A key design consideration is clock-versus-voltage derating: the 16MHz maximum speed is rated at 5V operation, so designs that drop VCC for power savings must correspondingly reduce system frequency. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA325-16MI - AVR 8-Bit MCU 16MHz 32KB Flash | Microchip
ATMEGA325-16MI

ATMEGA325-16MI - AVR 8-Bit MCU 16MHz 32KB Flash | Microchip

The Microchip Technology (Atmel) ATMEGA325-16MI is an 8-bit AVR RISC microcontroller with 16MHz max clock speed, 32KB (16K x 16) In-System Programmable Flash, 1KB EEPROM, and 2KB SRAM, housed in a 64-pin QFN/MLF (9x9 mm) surface-mount package with exposed pad. An 8-bit microcontroller (MCU) is a complete computing system on a single chip, combining a processor core, program memory, data memory, and peripherals such as timers, USARTs, and ADCs. The AVR ATmega family sits within the broader microcontroller hierarchy of embedded processors, positioned for cost-sensitive, general-purpose embedded control where a full 32-bit application processor is unnecessary. Microcontrollers like the ATMEGA325-16MI run bare-metal firmware or an RTOS and directly drive sensors, actuators, displays, and communication links. Key features include the Advanced RISC architecture with 130 powerful instructions, most executing in a single clock cycle; 16 MIPS throughput at 16MHz; 54 programmable I/O lines; two 8-bit and two 16-bit timers/counters; a 10-bit ADC; USART serial interface; and SPI support. Operating voltage spans 2.7V to 5.5V, and the industrial temperature grade (suffix MI) covers -40C to +85C, suiting harsh environments. Technically, the AVR core uses a Harvard architecture with separate program and data buses, enabling single-cycle instruction fetch and execution. In-System Programmable (ISP) Flash allows firmware updates on the assembled board via SPI, while boot-section self-programming supports field upgrades. JTAG boundary scan and on-chip debug simplify production test. Typical applications include industrial automation controllers, consumer appliances, IoT sensor nodes, HVAC and metering systems, and embedded human-machine interfaces where 32KB of code space and 54 GPIO lines cover mid-complexity control tasks. A key design consideration: at 5V and 16MHz the device runs at its rated maximums, so verify power budget and derating in high-temperature enclosures; the 2.7V to 5.5V range allows battery designs to run at reduced clock speeds for lower consumption. This page synthesizes distributor pricing, drop-in alternatives, design notes, and application guidance not found in a single manufacturer datasheet, verified as of 2026-09-17.

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ATMEGA325-16MUR - 8-bit AVR MCU 32KB 16MHz QFN-64 | Microchip
ATMEGA325-16MUR

ATMEGA325-16MUR - 8-bit AVR MCU 32KB 16MHz QFN-64 | Microchip

The Microchip Technology ATMEGA325-16MUR is a high-performance, low-power 8-bit AVR ATmega microcontroller IC with 32KB (16K x 16) ISP flash program memory, a 16MHz clock speed, and 54 general-purpose I/O lines, housed in a 64-pin QFN (9x9 mm) package with exposed pad. An 8-bit microcontroller is a single-chip computer integrating a processor core, program memory, data memory, and peripherals on one die. Within the power-management hierarchy of an embedded system, the MCU sits at the heart of the control layer: it reads sensors, executes firmware, and drives actuators. The AVR ATmega family popularized this category with its advanced RISC architecture, where most of the 131 powerful instructions execute in a single clock cycle, delivering up to 16 MIPS throughput at 16MHz. Key features of the ATMEGA325-16MUR include 32KB self-programmable flash, 1KB EEPROM, and 2KB internal SRAM for data storage. Connectivity is provided through SPI and UART/USART serial interfaces plus USI, while on-chip peripherals include brown-out detection/reset, power-on reset, PWM outputs, and a watchdog timer. The 4.5V to 5.5V supply range makes the 16MHz speed grade well suited to robust 5V industrial logic levels with superior noise margins. Technically, the AVR core uses a Harvard architecture with separate program and data buses, single-cycle ALU operation, and 32 general-purpose working registers directly connected to the ALU. This eliminates the arithmetic bottleneck typical of accumulator-based 8-bit cores. In-system programmable flash allows firmware updates on the assembled PCB via SPI. Typical applications include industrial automation controllers, building automation and HVAC nodes, and test-and-measurement instruments, all of which benefit from the 5V noise immunity, rich I/O count, and mature AVR toolchain ecosystem. A key design consideration: at 16MHz the part requires the 4.5V-5.5V supply range; lower-voltage designs must derate clock speed per the AVR frequency-voltage curve. This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA3250-16AI - 8-Bit AVR MCU 32KB Flash 16MHz | Microchip
ATMEGA3250-16AI

ATMEGA3250-16AI - 8-Bit AVR MCU 32KB Flash 16MHz | Microchip

The Microchip Technology ATMEGA3250-16AI is an 8-bit AVR RISC microcontroller with 32 KB ISP Flash memory, 1 KB EEPROM, 2 KB SRAM, and 16 MHz maximum clock frequency, housed in a 100-pin TQFP (TQFP-100) package rated for industrial -40C to +85C operation. It operates from 2.7V to 5.5V and provides 69 general purpose I/O lines in this package option. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle. Within the power management and embedded control hierarchy, it spans the class of general-purpose MCUs sitting between small 8-bit parts (ATmega168) and large 8-bit parts (ATmega2560), combining program Flash with in-system self-programming (read-while-write) capability. Key features include the advanced AVR RISC core with 130 powerful instructions and 32 general purpose working registers, delivering up to 16 MIPS throughput at 16 MHz. On-chip peripherals include a 10-bit ADC, USARTs, SPI and TWI (I2C) serial interfaces, multiple timers/pWM channels, and a JTAG interface for on-chip debug and boundary scan. The ISP Flash supports field firmware updates without removing the device from the PCB. Architecturally, the fast-register-file RISC design achieves one instruction per clock for most operations, while the two-stage pipeline sustains near-single-cycle throughput. Boot-section Flash with read-while-write support enables self-programming bootloaders, and in-circuit debug is available through JTAG. Typical applications include industrial automation controllers, building and HVAC control, consumer appliances, advanced sensing nodes, and embedded systems that need many I/O lines on a single 5V-tolerant MCU. The 69-GPIO count in the 100-TQFP makes it well suited to relay boards, keypads, and display-driven equipment. Design consideration: at 5V and 16 MHz the device meets full-speed specifications across the industrial temperature range, but at reduced VDD (down to 2.7V) maximum safe clock frequency decreases - consult the frequency-versus-voltage curve in the manufacturer datasheet before overclocking. This page adds information gain beyond the datasheet: distributor pricing as of 2026-09-17, drop-in alternatives, comparison tables, and practical design notes synthesized from multiple verified sources.

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ATMEGA3250-16AU - 8-bit AVR MCU 16MHz 32KB Flash | Microchip
ATMEGA3250-16AU

ATMEGA3250-16AU - 8-bit AVR MCU 16MHz 32KB Flash | Microchip

The Microchip Technology ATMEGA3250-16AU is an 8-bit AVR RISC microcontroller with 32 KB ISP Flash memory, 16 MHz maximum clock speed, and 54/69 general purpose I/O lines, housed in a 100-pin TQFP (14x14 mm) package. It operates from a 4.5 V to 5.5 V supply and includes 1 KB EEPROM and 2 KB SRAM. A microcontroller is a single-chip computer that integrates a processor core, program memory, data memory, and peripheral functions such as timers, serial interfaces, and analog-to-digital converters. Within the semiconductor hierarchy, the ATmega3250 belongs to the AVR ATmega family of 8-bit microcontrollers, a subset of embedded MCUs used in industrial control, appliances, and instrumentation where moderate processing power and rich I/O are required without the cost of a 32-bit platform. Key features include the advanced AVR RISC architecture with 131 powerful instructions, most of which execute in a single clock cycle, delivering up to 16 MIPS throughput at 16 MHz. The 32 KB Flash supports In-System Programming with read-while-write capability, enabling firmware updates in the field. A JTAG interface provides on-chip debugging and boundary-scan testing, a critical asset on dense 100-pin boards. Technically, the device combines three flexible timer/counters with compare modes, internal and external interrupt sources, a programmable serial USART, SPI and TWI (I2C) interfaces, an 10-channel 10-bit ADC, and a programmable Watchdog Timer with internal oscillator. Five power-saving modes, including idle and power-down, support low average-power designs, and the core is manufactured in Microchip's high-density non-volatile memory process. Typical applications include industrial automation controllers, HVAC and building control boards, point-of-sale and metering equipment, and consumer appliances that need many I/O lines. The 69 GPIO count and JTAG make it well suited for relay- and keypad-heavy boards. When designing, note that the -16AU speed grade requires a 4.5 V to 5.5 V supply for 16 MHz operation; at lower voltages the maximum safe clock frequency drops, so verify the voltage-frequency curve in the datasheet before overclocking. This page synthesizes distributor pricing, drop-in family alternatives, design notes, and SEO-structured comparison data not found in the manufacturer datasheet.

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ATMEGA3250A-AN - 32KB AVR MCU, 20MHz, 69 I/O | Microchip
ATMEGA3250A-AN

ATMEGA3250A-AN - 32KB AVR MCU, 20MHz, 69 I/O | Microchip

The Microchip (Atmel) ATMEGA3250A-AN is an 8-bit AVR RISC microcontroller with 32KB in-system programmable flash memory, 2KB SRAM, 1KB EEPROM, 69 general-purpose I/O lines, and a maximum clock speed of 20MHz, housed in a 100-lead TQFP package rated for operation up to 105C. An 8-bit AVR microcontroller is a Harvard-architecture processor that executes most of its 130 powerful instructions in a single clock cycle. Within the power-management hierarchy, it functions as an embedded control IC that combines CPU, program memory, data memory, and peripherals such as SPI and UART/USART on a single chip, making it a complete embedded system solution for cost-sensitive designs. Key features include the Advanced RISC architecture with most single-cycle instruction execution, in-system programmable (ISP) flash allowing firmware updates on the assembled PCB, an internal RC oscillator reducing external component count, and 69 I/O lines that enable direct drive of large keypads, LED segments, and multi-peripheral systems without port expanders. Technically, the device belongs to the ATmega3250/6450 family of high-performance, low-power AVR controllers. Program memory is organized as 16K x 16 flash, data SRAM as 2K x 8, and a separate 1KB EEPROM provides non-volatile storage for calibration data that survives firmware reprogramming. Connectivity peripherals include SPI and UART/USART interfaces for communication with displays, memory, and industrial networks. Typical applications include large-appliance control panels, building automation nodes, industrial HMI boards with many keys and LEDs, and battery-powered metering products where the low-power AVR core and internal oscillator minimize system cost. When designing, verify the supply-voltage operating envelope against the 20MHz speed grade and provide decoupling on all VCC/AVCC pins of the 100-lead TQFP, since high pin count increases transient current demand. This page synthesizes verified distributor data, same-family drop-in alternatives, and practical design guidance not found in the manufacturer datasheet.

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ATMEGA3250A-AU - 8-bit AVR MCU 32KB 20MHz TQFP-100 | Microchip
ATMEGA3250A-AU

ATMEGA3250A-AU - 8-bit AVR MCU 32KB 20MHz TQFP-100 | Microchip

The Microchip Technology ATMEGA3250A-AU is an 8-bit AVR ATmega microcontroller with 32KB In-System Programmable Flash, 2KB SRAM, 1KB EEPROM, and a maximum clock speed of 20MHz, housed in a 100-pin TQFP package measuring 14x14 mm. An 8-bit microcontroller is an integrated circuit that executes programs and controls electronic systems using an 8-bit data bus and an AVR enhanced RISC architecture. Within the product hierarchy, the ATmega3250A belongs to the AVR ATmega family of flash-based MCUs, which sits under the broader categories of embedded processors and semiconductor integrated circuits. AVR MCUs execute most instructions in a single clock cycle, delivering throughput near 1 MIPS per MHz. Key features include 131 powerful instructions with mostly single-cycle execution, 32 general purpose I/O ports with up to 68 programmable I/O lines, two USARTs, SPI and TWI (I2C) serial interfaces, and a JTAG boundary-scan and on-chip debug interface. The device also integrates an 8-channel 10-bit ADC, analog comparator, three timers (two 8-bit and one 16-bit), and a programmable watchdog timer with separate on-chip oscillator. Technically, the ATmega3250A uses the AVR advanced RISC core with 32 general-purpose working registers directly connected to the ALU, allowing two independent registers to be accessed in one instruction executed in one clock cycle. Program memory is In-System Programmable via SPI, and the device supports In-Application Programming and boot-code self-programming for field updates. The A-suffix device is a functionally identical drop-in replacement for the earlier ATmega3250, produced on an updated manufacturing process, as documented in Microchip application note AVR540. Typical applications include industrial automation controllers, building and access control systems, sensor hubs, LCD-adjacent instrumentation, and motor control panels where a large number of I/O lines and 5V operation are required. A key design consideration is supply voltage: this AU speed-grade device operates from 4.5V to 5.5V at 20MHz per the specification data, so designs running from 3.3V rails should evaluate the V-variant or reduce the clock frequency accordingly. This page consolidates distributor pricing, drop-in same-family alternatives, and practical engineering design notes that are not presented together in the manufacturer datasheet.

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ATMEGA3250A-AUR - 8-Bit AVR MCU, 32KB Flash, 20MHz | Microchip
ATMEGA3250A-AUR

ATMEGA3250A-AUR - 8-Bit AVR MCU, 32KB Flash, 20MHz | Microchip

The Microchip Technology ATMEGA3250A-AUR is an 8-bit AVR RISC microcontroller with 32 KB ISP Flash memory, 1 KB EEPROM, and 2 KB SRAM, executing at up to 20 MHz and packaged in a 100-pin TQFP (14x14 mm, 0.8 mm pitch) supplied on tape and reel. A microcontroller (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals on one die. Within the semiconductor hierarchy, the ATmega3250A belongs to the AVR ATmega family of 8-bit microcontrollers, which sit under the broader categories of embedded processors and integrated circuits. AVRs are widely used because their reduced instruction set (131 instructions, mostly single-cycle) delivers deterministic execution and high code density without the complexity of 32-bit cores. Key features of the ATMEGA3250A-AUR include the advanced AVR RISC architecture with 32 general-purpose working registers, read-while-write Flash for in-system programming, JTAG boundary-scan and on-chip debugging, and 54 general-purpose I/O lines. Peripherals include SPI, USART serial interfaces, an 8-channel 10-bit ADC, and multiple power-saving sleep modes, allowing a single chip to handle sensing, control, and communication in medium-complexity systems. Architecturally, the AVR core uses a Harvard structure with separate program and data buses, enabling one-cycle instruction fetch and execution. The A-version silicon supports 2.7 V to 5.5 V operation across the full industrial temperature range, and the picoPower-class power management provides Idle, Power-down, and Standby modes for battery-conscious designs. The 100-TQFP package exposes 54 GPIO plus power, clock, and JTAG pins, with 0.8 mm lead pitch for standard SMT assembly. Typical applications include industrial automation controllers, building and HVAC control panels, sensor acquisition nodes, and motor-driven consumer appliances. The generous 54-I/O count and 2x USART make the 3250A especially well suited to HMI panels and multi-channel control boards where pin count, not raw throughput, is the constraint. A key design consideration is clock selection: the 20 MHz rating applies across 4.5-5.5 V operation, while lower voltage rails require reduced maximum clock frequency, so always check the frequency-versus-voltage curve in the manufacturer datasheet before finalizing the clock source. This page synthesizes distributor pricing, drop-in alternatives, engineering design notes, and application guidance not found in the manufacturer datasheet alone.

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ATMEGA3250A-MN - 8-bit AVR MCU 32KB Flash 64QFN | Microchip
ATMEGA3250A-MN

ATMEGA3250A-MN - 8-bit AVR MCU 32KB Flash 64QFN | Microchip

The Microchip Technology ATMEGA3250A-MN is a high-performance, low-power 8-bit AVR RISC microcontroller with 32 KB ISP Flash memory (read-while-write capable), 1 KB EEPROM, and 2 KB SRAM, offering 54/69 general-purpose I/O lines in a 64-pin QFN (MN) surface-mount package rated to 105 degrees C as a green package variant. An 8-bit AVR microcontroller is a single-chip computer built around the AVR enhanced RISC architecture, executing most instructions in a single clock cycle. Within the power-management hierarchy, an MCU such as the ATmega3250A sits at the top of the embedded control stack: it combines a processor core, program memory, data memory, and peripherals (timers, USART, SPI, JTAG) on one die, replacing multi-chip processor-plus-memory solutions in cost- and power-sensitive systems. Key features include the 32 KB in-system-programmable Flash with read-while-write support for field firmware updates, 1 KB of non-volatile EEPROM for parameter storage, and up to 69 GPIO lines that suit large keypads, displays, and multi-board control. The device integrates a JTAG interface for on-chip debugging and boundary-scan, plus SPI and USART serial connectivity. A brown-out detector and internal RC oscillator options reduce external component count. Technically, the AVR core uses a Harvard architecture with 32 general-purpose working registers directly connected to the ALU, allowing one-cycle execution of most instructions and delivering up to 20 MIPS throughput at 20 MHz. Boot-section Flash supports self-programming for in-application upgrades. Typical applications include industrial control panels, building automation nodes, LCD-based instrumentation, and consumer appliance controllers where rich I/O and code densities near 32 KB are required. Design consideration: verify the supply-voltage and clock configuration against the manufacturer datasheet before layout, since the MN (QFN) package thermal pad must be soldered to a ground plane for reliable operation. This page synthesizes distributor availability, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA3250P-20AU - AVR 8-bit MCU 20MHz 32KB TQFP-100 | Microchip
ATMEGA3250P-20AU

ATMEGA3250P-20AU - AVR 8-bit MCU 20MHz 32KB TQFP-100 | Microchip

The Microchip Technology ATMEGA3250P-20AU is a picoPower 8-bit AVR RISC microcontroller delivering 20 MHz maximum clock frequency, 32 KB of ISP flash memory, 2 KB of SRAM and 1 KB of EEPROM in a 100-pin TQFP (14x14 mm) surface-mount package operating at 4.5V to 5.5V. A microcontroller unit (MCU) is a single integrated circuit that combines a processor core, memory, and programmable input/output peripherals, sitting at the top of the embedded control hierarchy from simple logic ICs up to full system-on-chip solutions. The AVR family popularized single-cycle RISC execution, and this ATmega device executes 131 powerful instructions, most in a single clock cycle, achieving up to 20 MIPS throughput at 20 MHz. Key features include 69 general-purpose I/O lines with internal pull-ups, a JTAG interface for boundary-scan, on-chip debugging and programming, three flexible timer/counters with compare modes, an 8-channel 10-bit ADC, and a programmable serial USART. The picoPower technology delivers low active and sleep-mode consumption, with six software-selectable power-saving modes including idle, power-save, power-down, standby, ADC noise reduction, and extended standby. Architecturally, the device uses a Harvard structure with separate program and data buses, 32 general-purpose working registers directly connected to the ALU, and read-while-write flash for in-system self-programming. Endurance is rated at 10,000 flash and 100,000 EEPROM write/erase cycles with 20-year data retention at 85C. Typical applications include industrial automation controllers, building and HVAC control panels, metering systems, and consumer appliances where a 5V industrial noise margin and abundant I/O are required. For design, ensure the supply is decoupled with 100 nF ceramics at each VCC/GND pair and drive AVCC properly even when the ADC is unused. Pricing on this page reflects distributor data as of 2026-09-17; this page adds drop-in alternatives, pinout guidance, and design notes not consolidated in the manufacturer datasheet.

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ATMEGA3250PA-AU - 8-bit AVR MCU 32KB 20MHz TQFP-100 | Microchip
ATMEGA3250PA-AU

ATMEGA3250PA-AU - 8-bit AVR MCU 32KB 20MHz TQFP-100 | Microchip

The Microchip Technology (Atmel) ATMEGA3250PA-AU is a picoPower 8-bit AVR RISC microcontroller with 32 KB in-system programmable Flash, 2 KB SRAM, 1 KB EEPROM, 69 general-purpose I/O lines and 20 MHz maximum clock speed, housed in a 100-pin TQFP (14 x 14 mm) package for industrial temperature ranges. A microcontroller (MCU) is a single-chip computer that integrates a processor core, memory, and peripherals on one die, sitting at the device level of the embedded-systems hierarchy (semiconductor -> integrated circuit -> microcontroller -> 8-bit MCU -> AVR ATmega family). MCUs run dedicated control tasks in everything from appliances to industrial automation, and the AVR architecture with its 131 mostly single-cycle instructions is one of the most widely deployed 8-bit platforms in the industry. Key differentiating features include the picoPower technology for sub-uA sleep-mode consumption, read-while-write Flash capability for firmware updates during operation, a JTAG interface for on-chip debugging and boundary scan, and three flexible timer/counters with compare modes. The 32 general-purpose working registers are directly connected to the ALU, enabling fully static operation with up to 16 MIPS throughput at 16 MHz and up to 20 MIPS-class execution at the full 20 MHz rating. On the connectivity side, the ATMEGA3250PA-AU integrates SPI, UART/USART and USI serial interfaces, plus an 8-channel 10-bit ADC (per the ATmega3250/6450 family architecture) and an internal bandgap reference, allowing direct interface with sensors and communication peripherals without external glue logic. Typical applications include industrial automation controllers, building and HVAC control, sensor hubs, and legacy AVR designs requiring a high-I/O-count 8-bit MCU in a TQFP-100 footprint. The 69 I/O lines make it especially suited to relay matrices, keypad scanning, and multi-segment LCD-free display driving. From a design standpoint, keep the VCC/AVCC/GND pin pairs properly decoupled with 100 nF ceramics, and verify that brown-out detection is enabled for industrial supply environments. This page synthesizes distributor pricing, verified drop-in alternatives, and practical design guidance not found in the manufacturer datasheet, with all key data verified against web sources as of 2026-09-17.

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ATMEGA3250PA-AUR - 8-bit AVR MCU 32KB Flash 20MHz | Microchip
ATMEGA3250PA-AUR

ATMEGA3250PA-AUR - 8-bit AVR MCU 32KB Flash 20MHz | Microchip

The Microchip Technology ATMEGA3250PA-AUR is a picoPower 8-bit AVR RISC microcontroller with 32KB in-system programmable Flash, 2KB SRAM, 1KB EEPROM, and 69 general purpose I/O lines, executing at up to 20MHz from a 100-pin TQFP (14x14 mm) package. An 8-bit AVR microcontroller is a Harvard-architecture RISC device that executes most of its 131 instructions in a single clock cycle, making it a member of the broader microcontroller hierarchy: MCU -> embedded processor -> semiconductor IC. MCUs integrate CPU, memory, timers, and peripherals on one die, eliminating external glue logic in cost-sensitive embedded systems. Key features include the advanced RISC AVR core delivering up to 20 MIPS throughput at 20MHz, read-while-write Flash for safe in-application self-programming, 32 general purpose working registers directly connected to the ALU, and picoPower technology for ultra-low sleep-mode consumption. On-chip peripherals include JTAG for boundary scan and on-chip debugging, 10-bit ADC channels, multiple 8-bit and 16-bit timers with PWM, USARTs, SPI, and two-wire interface (I2C-compatible). The PA suffix denotes the picoPower-optimized die with low-voltage operation down to 1.8V and industry-leading active and sleep current, while the -AUR ordering code specifies industrial temperature range (-40C to +85C), lead-free RoHS/Green packaging on tape and reel for automated assembly. Typical applications include industrial control panels with many switch and relay I/O points, building automation and HVAC controllers, battery-powered metering, and consumer appliance front-end boards where 69 I/O lines in a single 14x14 mm footprint reduce BOM cost. Design consideration: the AVR core is a 5V-tolerant-friendly design but speed derates with VCC; at 1.8V the maximum safe clock is approximately 4MHz, so set the CKDIV8 fuse or scale the system clock when running from batteries or 3.3V rails. This page adds value beyond the manufacturer datasheet by consolidating drop-in family alternatives, application pairings, design notes, and distributor pricing context in one AI-citable reference.

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ATMEGA3250PV-10AU - 8-bit AVR MCU 32KB 10MHz | Microchip
ATMEGA3250PV-10AU

ATMEGA3250PV-10AU - 8-bit AVR MCU 32KB 10MHz | Microchip

The Microchip Technology (Atmel) ATMEGA3250PV-10AU is a low-power 8-bit AVR ATmega microcontroller IC built on the AVR enhanced RISC architecture, delivering up to 10 MHz clock speed, 32 KB (16K x 16) of In-System Programmable FLASH, 2 KB SRAM and 1 KB EEPROM, housed in a 100-pin TQFP (14 x 14 mm, 0.8 mm pitch) surface-mount package. An 8-bit microcontroller integrates a processor core, program memory, data memory and peripherals on a single chip. Within the power-management hierarchy, the ATmega family sits in the general-purpose MCU category: AVR RISC core -> 8-bit microcontroller -> embedded MCU -> semiconductor IC. The AVR core executes most instructions in a single clock cycle, achieving throughput of up to 10 MIPS at 10 MHz while consuming minimal power. Key features include 131 powerful instructions (most single-cycle), the picoPower P suffix low-power process, 32 general purpose working registers, and In-System Programmable (ISP) FLASH enabling firmware updates on the production line. The V speed grade supports operation from 1.8 V to 5.5 V, covering battery-powered 3.3 V designs as well as industrial 5 V systems, with full static operation between 0 MHz and 10 MHz across the range. Technically, the device pairs its AVR RISC core with hardware multiplier support, multiple timer/counters with PWM outputs, USART serial communication, an on-chip 10-bit ADC, and programmable Watchdog Timer with its own oscillator. Five sleep modes (including Idle, ADC Noise Reduction and Power-down) allow the designer to match power consumption to the application profile, which is why the P-series was positioned for battery and low-power industrial products. Typical applications include industrial control panels with LCD and keypad interfaces, battery-powered instrumentation and metering, building automation nodes, and legacy AVR-based product lines requiring a picoPower-class drop-in MCU. Design-wise, remember that the -10 speed grade limits maximum clock frequency; at 5 V you may run up to 10 MHz, and for faster execution step up to the ATMEGA3250P-20AU 20 MHz variant in the same footprint. Decouple VCC/AVCC with 0.1 uF ceramics close to each pin pair. This page synthesizes distributor pricing (as of 2026-09-17), drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA3250PV-10AUR - 8-bit AVR MCU 32KB 10MHz | Microchip
ATMEGA3250PV-10AUR

ATMEGA3250PV-10AUR - 8-bit AVR MCU 32KB 10MHz | Microchip

The Microchip Technology ATMEGA3250PV-10AUR is an 8-bit AVR ATmega microcontroller featuring 32KB (16K x 16) of In-System Programmable Flash, 2KB SRAM, 1KB EEPROM, and a 10MHz maximum clock rate, operating from 1.8V and packaged in a 100-pin TQFP (14x14 mm) surface-mount body supplied in 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 microcontrollers (MCU) under the semiconductor and embedded processing families. MCUs of this class integrate program Flash, data SRAM, EEPROM, timers, USARTs, SPI, TWI (I2C), and an ADC on a single die, replacing multi-chip designs in cost-sensitive embedded systems. The AVR core in the ATmega family achieves up to 16 MIPS throughput thanks to its advanced RISC architecture with 131 powerful instructions and 8 general-purpose working registers. Key features of the ATMEGA3250PV-10AUR include the PicoPower 'picoV' derivative designation: the V suffix indicates a wide 1.8V to 5.5V operating voltage range suited to battery-powered designs, while the P suffix denotes picoPower technology with multiple sleep modes for ultra-low power consumption. The 10MHz speed grade supports 1.8V operation across the full voltage range, and fully static operation allows clocking down to DC for power-critical polling designs. The architecture is fully static and executes most instructions in a single clock cycle, delivering deterministic real-time behavior that is prized in industrial control. The 100-pin TQFP exposes an unusually rich GPIO count for the ATmega family, enabling parallel interfacing to displays, keypads, and external memory-mapped peripherals without port expanders. Typical applications include industrial automation controllers, HVAC and building control panels, battery-operated metering, and consumer appliances where a wide supply window, many I/O pins, and in-system programmability shorten development cycles. Design consideration: at 1.8V operation the 10MHz grade is the correct speed selection; higher speed grades (16/20MHz) require higher minimum supply voltages, so verify your rail before substituting. This page synthesizes distributor pricing, drop-in alternatives within the same 100-TQFP footprint, and practical design notes not consolidated in the manufacturer datasheet.

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ATMEGA3250V-8AU - 8-bit AVR MCU 32KB 8MHz 100-TQFP | Microchip
ATMEGA3250V-8AU

ATMEGA3250V-8AU - 8-bit AVR MCU 32KB 8MHz 100-TQFP | Microchip

The Microchip Technology ATMEGA3250V-8AU is an 8-bit AVR RISC microcontroller with 32 KB ISP FLASH (16K x 16), 1 KB EEPROM, and 2 KB SRAM, running at up to 8 MHz and housed in a 100-pin TQFP (14 x 14 mm) package. Operating from a 1.8 V to 5.5 V supply, it belongs to the low-voltage ATmega3250 family for battery and industrial designs. An AVR ATmega microcontroller is a family of 8-bit Harvard-architecture MCUs that combine flash program memory, SRAM, EEPROM, timers, ADC, and serial interfaces on a single chip. Within the power-management hierarchy of embedded systems, the ATmega3250 sits in the mid-range segment, executing most of its 131 instructions in a single clock cycle via its advanced RISC core with 32 general-purpose working registers. Key features include 54 general-purpose I/O lines for large peripheral counts, an 8-channel 10-bit ADC, JTAG for on-chip debugging and boundary scan, and read-while-write flash for in-system self-programming. The V speed grade permits full 8 MHz operation down to 1.8 V, unlike the standard ATmega3250 which requires a higher minimum voltage. The AVR core pairs a two-stage pipeline with single-cycle ALU operations, delivering roughly 1 MIPS per MHz. Memory is organized as 32 KB FLASH with 16 K x 16 addressing, 2 KB internal SRAM, and 1 KB endurance-rated EEPROM accessed through an address register pair. On-chip peripherals include 8-bit and 16-bit timers with PWM, USART, SPI, and TWI (I2C) serial engines. Typical applications include industrial control panels with many buttons and LEDs, battery-powered metering instruments that exploit the 1.8 V operation, and building automation nodes using the 54 GPIO plus TWI/SPI expansion. The JTAG interface shortens development cycles on dense 100-pin boards. Design consideration: at 8 MHz maximum frequency, choose the ATMEGA3250P-20AU or ATMEGA3250-16AU variants when 5 V operation and higher clock speed are needed; the V device trades speed for the widest voltage window. Decouple VCC/AVCC pins individually and connect all ground pins to a solid plane. This page synthesizes distributor pricing, drop-in alternatives, comparison tables, and practical design notes not found in the manufacturer datasheet, with pricing referenced as of 2026-09-17.

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ATMEGA3250V-8AUR - 8-bit AVR MCU 32KB 8MHz TQFP-100 | Microchip
ATMEGA3250V-8AUR

ATMEGA3250V-8AUR - 8-bit AVR MCU 32KB 8MHz TQFP-100 | Microchip

The Microchip Technology ATMEGA3250V-8AUR is a low-power 8-bit AVR ATmega microcontroller with 32KB (16K x 16) of In-System Programmable FLASH, 1KB EEPROM, 2KB SRAM, and a maximum clock frequency of 8MHz, housed in a 100-pin TQFP (14x14 mm) package and rated for the 1.8V to 5.5V voltage range and industrial temperatures. An 8-bit microcontroller is a single-chip computer that integrates a CPU core, program memory, data memory, timers, and peripheral interfaces into one IC. The AVR family popularized the modified Harvard RISC architecture, in which most instructions execute in a single clock cycle; within the power-management hierarchy, an MCU like this sits at the lowest level of an embedded system, directly driving sensors, displays, and communication peripherals without an external CPU. Key features include the AVR enhanced RISC core executing 130-131 powerful instructions, 32 general-purpose working registers, 32 I/O lines across multiple ports, JTAG boundary-scan and on-chip debugging, and an In-System Programmable (ISP) FLASH that allows firmware updates on the assembled PCB. The V-grade voltage rating of 1.8V to 5.5V enables direct battery operation from two or three cells as well as 5V industrial rails. Architecturally, the two-stage pipeline overlaps instruction fetch and execution, delivering close to 1 MIPS per MHz. Peripherals typically include an 8-channel 10-bit ADC, USART, SPI, and multiple 8-bit and 16-bit timers with PWM, allowing the device to replace external glue logic in measurement and control boards. Typical applications include industrial control panels with segmented LCD or discrete LED interfaces, battery-powered metering and datalogging equipment, and building-automation sensor nodes, all of which benefit from the wide voltage range and rich port count of the 100-pin footprint. A key design consideration is clock selection: at 8MHz maximum rating, the V-variant suits low-speed, low-power designs; do not clock it above 8MHz or select the faster P/A grades unless the supply budget permits. This page synthesizes distributor availability data, same-family drop-in alternatives, and practical design guidance not found in the manufacturer datasheet, with pricing referenced as of 2026-09-17.

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ATMEGA325A-AN - 8-bit AVR MCU 32KB 20MHz | Microchip
ATMEGA325A-AN

ATMEGA325A-AN - 8-bit AVR MCU 32KB 20MHz | Microchip

The Microchip Technology ATMEGA325A-AN is a high-performance, low-power 8-bit AVR RISC microcontroller with 32 KB ISP Flash memory, 2 KB SRAM, 1 KB EEPROM, and a 20 MHz maximum operating frequency, housed in a 64-pin TQFP (14x14 mm) surface-mount package. It operates at 5V and is rated for industrial temperature ranges up to 105C. A microcontroller (MCU) is a complete computing system integrated onto a single chip, combining a processor core, program memory, data memory, and peripherals. The ATmega family sits within Microchip's broader AVR product line, which in turn belongs to the 8-bit microcontroller class within the semiconductor device hierarchy. MCUs like the ATmega325A execute embedded control code directly and are the workhorses of industrial automation, instrumentation, and consumer appliance design. Key features include the advanced AVR RISC architecture executing 130 powerful instructions, most in a single clock cycle, plus 32 general-purpose 8-bit working registers that keep the datapath efficient. The 32 KB self-programmable Flash supports In-System Programming (ISP) with read-while-write capability, enabling field firmware updates without removing the device from the board. Peripheral richness - including USART serial ports, SPI, an 8-channel 10-bit ADC, timers with PWM outputs, and analog comparators - allows a single ATMEGA325A-AN to replace several discrete logic and analog ICs in a design. The A-suffix silicon revision represents Microchip's ongoing ATmega core lineage with mature, well-characterized electrical performance. The internal oscillator option eliminates the need for an external crystal in cost-sensitive or timing-tolerant applications, while an external crystal interface supports precise 20 MHz operation for timing-critical designs. The 64-TQFP (14x14 mm) package provides 54 general-purpose I/O lines, giving enough pin count for parallel displays, keypads, and multi-peripheral buses. Typical applications include industrial control panels, motor and appliance control, sensor acquisition systems, metering products, and hobby or educational embedded platforms. The generous Flash density accommodates C-based applications with communication stacks, while the 10-bit ADC serves analog sensor front ends directly. Design consideration: the 2 KB SRAM is the main capacity constraint - engineers planning heavy buffering or RTOS-based designs should budget stack and heap usage carefully, or evaluate the pin-compatible ATmega3250 siblings for complementary options. This page synthesizes distributor pricing, verified drop-in alternatives within the same 64-TQFP footprint, and practical design notes not found in a single manufacturer datasheet, giving engineers a one-stop selection resource.

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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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