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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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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