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ATMEGA328P-PN

ATMEGA328P-PN - 8-bit AVR MCU 20MHz 32KB Flash PDIP-28 | Microchip

The Microchip Technology ATMEGA328P-PN is an 8-bit AVR RISC microcontroller executing up to 20 MIPS at 20 MHz, with 32KB of self-programmable ISP flash memory, 2KB of SRAM, and 1KB of EEPROM, housed in a 28-pin PDIP package rated for -40C to +105C operation. An 8-bit microcontroller is a single-chip computer whose CPU processes data in 8-bit words, integrating processor core, program memory, data memory, timers, communication peripherals, and analog converters into one package. Within the power-management-free MCU hierarchy, the AVR family from Atmel (now Microchip Technology) popularized single-cycle RISC execution, making the ATmega line a mainstay of embedded control, education, and the Arduino ecosystem. Key features include 23 programmable general-purpose I/O lines, 6-channel 10-bit ADC, two 8-bit timers, one 16-bit timer, USART, SPI, and TWI (I2C) serial interfaces, plus a watchdog timer, analog comparator, and six sleep modes down to 0.1 uA in power-save mode. The picoPower (p) technology and wide 2.5V to 5.5V supply range support battery-powered designs. Architecturally, the AVR core uses Harvard memory organization with 131 single-cycle RISC instructions and on-chip debug via debugWIRE, while the flash is segmented for boot-loader self-programming. The 662-page family datasheet documents the complete register set, and the ATmega328P is famously the microcontroller of the Arduino Uno. Typical applications include Arduino-compatible boards, home appliances, HVAC and motor control, industrial sensing nodes, and hobbyist embedded projects. The through-hole PDIP-28 package makes it ideal for prototyping, socketed production boards, and educational kits. Design tip: program in-system via ISP header or debugWIRE on the reset pin; keep decoupling capacitors close to VCC and AVCC, and always return AREF to GND through a capacitor if the ADC is used. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA328P-PU

ATMEGA328P-PU - 8-bit AVR MCU 32KB Flash 28-PDIP | Microchip

The Microchip Technology ATMEGA328P-PU is an 8-bit AVR RISC microcontroller with 32 KB ISP Flash memory, 1 KB EEPROM, 2 KB SRAM, and 23 general-purpose I/O lines, housed in a 28-pin PDIP (PU) package. This is the classic microcontroller at the heart of the Arduino Uno R3, making it one of the most widely recognized MCUs in the industry. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals such as timers, UART, SPI, and I2C on one die. Within the power-management hierarchy of embedded systems, an MCU sits between discrete logic and full application processors, executing control and sensing tasks in cost-sensitive designs. The AVR family, originally developed by Atmel and now part of Microchip Technology, popularized single-cycle RISC execution for 8-bit control. The ATMEGA328P-PU executes 131 powerful instructions, most in a single clock cycle, through its AVR advanced RISC architecture with 32 general-purpose working registers. The P suffix denotes picoPower technology, delivering low power consumption with multiple sleep modes for battery-operated designs. Program memory supports In-System Programming (ISP) with read-while-write capability, enabling firmware updates over the Arduino bootloader or an ISP programmer such as the USBasp or AVRISP mkII. The architecture pairs a Harvard-memory AVR core with a 10-bit ADC, three flexible timers (two 8-bit and one 16-bit), a full-duplex USART, and hardware SPI and TWI (I2C) interfaces. Operating voltage for the -PU grade is 4.5 V to 5.5 V, which supports direct 5 V logic interfacing without level shifting. Typical applications include Arduino-compatible educational and maker boards, home automation and IoT sensor nodes, industrial control panels, and legacy equipment service replacements where a socketed DIP part simplifies field repair. Design tip: keep the clock at 16 MHz for full 5 V Arduino compatibility; the -PU grade is rated for 20 MHz max clock in the 4.5 V to 5.5 V supply window per DigiKey listing. Always decouple VCC and AVCC with 100 nF capacitors. This page synthesizes drop-in alternatives, package comparison data, and practical design notes not found in the manufacturer datasheet, with pricing as of 2026-09-17.

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ATMEGA328PB-ABTVAO

ATMEGA328PB-ABTVAO - 16MHz 32KB 32-TQFP AVR MCU | Microchip

Microchip ATMEGA328PB-ABTVAO is a low-power 8-bit AVR microcontroller with a 16 MHz maximum clock, 32 KB flash memory and a 32-pin TQFP package. The device operates up to 105°C for automotive temperature-range applications and is supplied in tape-and-reel packaging according to the verified distributor listing. Its 32 general-purpose I/O lines support compact embedded-control designs that require communication, timing, sensing and actuator interfaces. An 8-bit microcontroller is a programmable semiconductor containing a CPU core, memory and integrated peripherals on one package. The ATmega328PB belongs to the AVR family of reduced-instruction-set-computing devices and is positioned below general-purpose microcontrollers in complexity. Its deterministic execution model and extensive peripheral integration make it suitable for control systems, consumer products, industrial equipment and automotive subsystems that do not require a high-performance application processor. Key device features include 32 KB of program flash, 2 KB of EEPROM, 4 KB of SRAM, 27 general-purpose I/O lines and 32 general-purpose working registers. The manufacturer describes the picoPower architecture as capable of throughputs close to 1 MIPS per MHz. Two flexible timer/counter blocks support periodic measurement, timing and event handling, while the I/O count enables multiple digital interfaces without requiring a larger package. The ATmega328PB uses the AVR enhanced RISC architecture and executes instructions within a single clock cycle. Read-while-write capability in flash supports efficient program-memory access, while the integrated EEPROM preserves nonvolatile configuration or calibration data. Its operating temperature rating of 105°C distinguishes this automotive-temperature ordering from versions limited to lower commercial or industrial temperature ceilings. Typical applications include automotive body and environment controls, compact industrial controllers, sensor nodes, serial-interface equipment and Arduino-compatible embedded platforms. The 32-pin TQFP footprint is easy to inspect and rework, and the large exposed perimeter and fine lead pitch provide a practical balance between pin availability, manufacturability and board area. The 32 general-purpose I/O pins leave electrical connectivity for power, ground, programming, clocking, reset, communications and application-specific signals. Designers should verify every peripheral, pin-multiplexing choice, fuse configuration and communication interface against the manufacturer datasheet before releasing a PCB. The automotive-temperature grade does not by itself establish AEC-Q100 qualification, functional-safety compliance or suitability for every vehicle subsystem. Decoupling, programming-header access, clock stability and unused-pin treatment also require board-level review. This product page consolidates verified distributor and manufacturer information, same-package ATmega328PB alternatives, application guidance and design cautions. It is intended to support faster engineering selection while clearly separating confirmed facts from parameters that still require confirmation from the complete Microchip datasheet or application-specific qualification records.

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ATMEGA328PB-AN

ATMEGA328PB-AN - 8-bit AVR MCU 20MHz 32KB Flash TQFP-32 | Microchip

The Microchip Technology ATMEGA328PB-AN is a low-power 8-bit AVR RISC microcontroller delivering 20 MHz maximum clock frequency, 32 KB of In-System Programmable Flash, and 2 KB SRAM in a 32-pin TQFP (7x7 mm) package. Based on the picoPower AVR enhanced RISC architecture, it executes powerful instructions in a single clock cycle and achieves throughputs close to 1 MIPS per MHz. An 8-bit AVR microcontroller is a single-chip computer that integrates a RISC processor core, program Flash memory, data SRAM, EEPROM, and a rich set of peripherals on one die. Within the embedded systems hierarchy, it sits in the microcontroller class below 32-bit MCUs but above simple 4-bit controllers, making it a mainstay of cost-sensitive embedded control, education platforms, and Arduino-compatible designs. Key features include 1 KB of EEPROM for non-volatile data storage, 27 general purpose I/O lines, and five flexible Timer/Counters with compare modes - a significant peripheral increase over the ATmega328P. The device also integrates two serial programmable USARTs and two two-wire (I2C) interfaces, enabling simultaneous multi-bus designs that previously required external bridges. Technical depth comes from the AVR architecture: 32 general purpose working registers are directly connected to the ALU, allowing one-cycle execution of register-to-register operations. The picoPower technology portfolio provides multiple sleep modes with low wake-up times, supporting battery-powered designs. In-System Programmable Flash with Read-While-Write capability allows firmware updates through the SPI interface without removing the device from the board. Typical applications include Arduino-compatible development boards, industrial sensor nodes, consumer appliance control, and battery-powered data loggers. The added second USART and second SPI/I2C bus make it particularly attractive for designs that previously needed glue logic to connect multiple peripherals. When designing with this device, note that while software is backward compatible with the ATmega328P, the device signature differs, and bootloader or fuse tooling such as MiniCore should be configured for the 328PB. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single verified reference for selection and sourcing as of 2026-09-17.

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ATMEGA328PB-ANR

ATMEGA328PB-ANR - 8-Bit AVR MCU 20MHz 32KB Flash TQFP-32 | Microchip

The Microchip Technology ATMEGA328PB-ANR is a picoPower 8-bit AVR RISC microcontroller delivering 20 MHz maximum clock frequency, 32 KB of ISP Flash memory, and 4 KB of SRAM in a 32-pin TQFP (7x7 mm) package, rated for the extended industrial temperature range of -40C to +105C. An 8-bit AVR microcontroller is a single-chip processor based on the AVR enhanced RISC architecture, in which most instructions execute in a single clock cycle to achieve throughput close to 1 MIPS per MHz. Within the power-management hierarchy, an MCU integrates the CPU, program memory, data memory, timers, communication peripherals, and analog blocks, replacing multi-chip logic solutions in embedded control systems. Key features include 27 general-purpose I/O lines, 32 general-purpose working registers, and a richer peripheral set than the ATmega328P: the 328PB adds a second SPI interface, a second TWI (I2C) interface, an additional USART (three total), and two extra 16-bit timer/counters. The picoPower technology supports multiple sleep modes for ultra-low-power battery operation, and read-while-write Flash enables in-system programming without halting execution. Architecturally, the device combines a Harvard-structure AVR core with a two-stage pipeline, hardware multiply, and flexible interrupt controller. Analog peripherals include a 10-bit ADC and analog comparators, while flexible timer/counter modules with PWM outputs drive motor, lighting, and power-conversion tasks. The extended -40C to +105C rating (the -AN suffix distinguishes it from the standard -40C to +85C -AU grade) suits deployments near heat sources such as power supplies and motors. Typical applications include Arduino-compatible embedded controllers, industrial sensor nodes, HVAC and appliance control boards, and battery-powered IoT end nodes. Its backward software compatibility with the hugely popular ATmega328P protects existing code investments while providing more serial interfaces for expanding system connectivity. A key design consideration: per Microchip and community migration notes, the 328PB is software-compatible with the 328P but exposes the added Port E and second buses on different pin locations; verify the 32-pin TQFP pinout against the datasheet when migrating legacy designs. This page synthesizes verified distributor pricing, drop-in TQFP-32 alternatives, pinout data, and practical design notes not consolidated in the manufacturer datasheet.

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ATMEGA328PB-AU

ATMEGA328PB-AU - 8-Bit AVR MCU 20MHz 32KB Flash | Microchip

The Microchip Technology ATMEGA328PB-AU is a low-power 8-bit AVR RISC microcontroller executing up to 20 MIPS at 20 MHz, with 32 KB of in-system self-programmable Flash (organized 16K x 16), 2 KB EEPROM, 4 KB SRAM, and 27 general-purpose I/O lines, housed in a 32-pin TQFP (7 x 7 mm) package. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, achieving throughputs close to 1 MIPS per MHz. Within the power-management and embedded-control hierarchy, it spans the classic 8051/PIC class up to entry-level 32-bit MCUs, and the ATmega328PB is the direct peripheral-enhanced successor to the widely used ATmega328P that powers the Arduino UNO and Nano. Key features include the picoPower technology for sub-uA sleep currents, two flexible 8/16-bit timer/counters, two USARTs, two TWI (I2C) interfaces, and two SPI interfaces - one more of each serial peripheral than the ATmega328P. The device also provides a 10-bit ADC with up to 7 external channels, an analog comparator, and a programmable watchdog timer. Architecturally, the AVR enhanced RISC core combines 32 general-purpose working registers directly connected to the ALU, allowing single-cycle instruction execution and efficient C compilation. On-chip ISP Flash supports read-while-write firmware updates, and recent production includes Functional Safety (FuSa) support per Microchip's safety documentation. Typical applications include Arduino-compatible hobby and maker boards, industrial sensors and actuators, consumer appliance control, battery-powered IoT nodes, and legacy ATmega328P cost-down redesigns, where the PB variant adds peripherals while reducing cost. Design consideration: the ATmega328PB is software-backward-compatible with the ATmega328P, but the added Port E functions on pins 19 and 22 mean designs leaving those pins connected to external circuitry should verify the enhanced pinout against the Microchip datasheet 40001906 before layout reuse. This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not consolidated in the manufacturer datasheet.

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ATMEGA328PB-AUR

ATMEGA328PB-AUR - 8-Bit AVR MCU 32KB Flash 20MHz TQFP-32 | Microchip

The Microchip Technology ATMEGA328PB-AUR is a low-power 8-bit AVR RISC microcontroller with 32KB of ISP Flash memory (organized 16K x 16), 2KB EEPROM, 4KB SRAM, and a 20MHz maximum clock, housed in a 32-pin TQFP (7x7 mm) package delivered in tape-and-reel format. A microcontroller unit (MCU) is a single-chip computer integrating a processor core, program memory, data memory, and peripherals. The ATmega328PB belongs to the AVR ATmega family, part of the broader 8-bit microcontroller hierarchy within embedded processing semiconductors. Executing powerful instructions in a single clock cycle, the picoPower AVR architecture achieves throughput close to 1 MIPS per MHz, letting designers trade clock speed against power. Key features include 27 general-purpose I/O lines, 32 general-purpose working registers, two flexible 8-bit timer/counters, two 16-bit timer/counters (up from one on the ATmega328P), a 10-bit ADC, and dual SPI and dual TWI (I2C) interfaces - the PB adds a second SPI and second I2C bus versus the classic 328P. Functional Safety (FuSa) support is listed by DigiKey for this part. The enhanced AVR core uses single-cycle RISC execution with Harvard architecture, separating instruction and data buses. Software is fully backward compatible with the ATmega328P, and code and fuses port over without modification, while the richer peripheral set enables designs that previously required external expansion. Typical applications include Arduino-compatible boards, industrial control and sensor nodes, consumer appliances, and battery-powered portable devices where picoPower sleep modes extend battery life. Design consideration: the added Port E / second-bus pins make the PB not an officially guaranteed pin-for-pin drop-in in every legacy footprint - verify pins shared with the 328P per Microchip migration guidance before layout reuse. This page synthesizes distributor pricing (as of 2026-09-17), drop-in alternatives, pinout, and practical design notes not found in the manufacturer datasheet.

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ATMEGA328PB-MBTVAO

ATMEGA328PB-MBTVAO - 8-Bit AVR MCU 32KB Flash QFN-32 | Microchip

The Microchip Technology ATMEGA328PB-MBTVAO is an automotive-grade picoPower 8-bit AVR RISC microcontroller with 32 KB ISP Flash, 2 KB EEPROM, 4 KB SRAM, up to 20 MHz core clock, and 27 general-purpose I/O lines, housed in a 32-pin VQFN (5x5 mm) package rated from -40C to +105C and 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, delivering throughput close to 1 MIPS per MHz. Within the power-management hierarchy, it combines the CPU, program Flash, SRAM, EEPROM, timers, and communication peripherals (UART, SPI, I2C) in a single IC, making it the complete embedded control element of a board-level design. Key differentiating features include the picoPower low-power technology for battery-operated designs, an enhanced peripheral set versus the ATmega328P (two USARTs, two I2C, two SPI peripherals), and AEC-Q100 automotive qualification with Functional Safety (FuSa) support. The 105C operating rating supports under-hood and industrial environments that standard commercial-grade parts cannot survive. Architecturally, the ATmega328PB builds on the AVR enhanced RISC core with 32 general-purpose working registers, hardware multiplier, and a rich timer suite including two 8-bit and one 16-bit timer/counters plus an RTC-capable asynchronous timer. Software is backward compatible with the popular ATmega328P, easing firmware migration. Typical applications include automotive body and comfort modules, industrial sensor nodes, IoT end devices, and motor-control auxiliaries, where the combination of 32 KB self-programmable Flash, dual serial buses, and -40C to +105C operation is decisive. Design consideration: if migrating from an ATmega328P in a 32-pin QFN footprint, verify the extended peripheral pin-mapping on Port E; Microchip application notes state the 328PB is software-backward-compatible but not a blind pin-for-pin drop-in in every package option. This page synthesizes distributor inventory, cross-reference data, pinout, and design guidance not consolidated in the manufacturer datasheet.

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ATMEGA328PB-MN

ATMEGA328PB-MN - 20MHz 8-Bit AVR MCU | Microchip

Microchip Technology ATMEGA328PB-MN is a low-power, 8-bit AVR microcontroller with a 20 MHz maximum clock, 32 KB Flash memory, 2 KB EEPROM, 4 KB SRAM, and 27 general-purpose I/O lines in a 32-VFQFN 5 x 5 mm package. It also provides two flexible 16-bit timers with PWM and compare-match modes, two 8-bit timers, a 10-bit ADC, SPI, I2C, USART, and universal-control ports. An 8-bit microcontroller is a compact computing platform that integrates a processor core, program memory, data memory, peripherals, and I/O into one semiconductor package. The ATmega328PB belongs to the AVR enhanced RISC microcontroller family, where its enhanced RISC architecture executes powerful instructions within a single clock cycle and achieves throughput close to 1 MIPS per MHz. This makes it a practical member of the broader embedded-controller and power-management semiconductor hierarchy. Key features include 32 KB of Flash memory for firmware, 2 KB of EEPROM for nonvolatile data, 4 KB of SRAM for working memory, and 27 general-purpose I/O lines. The device operates at up to 20 MHz and includes two flexible 16-bit timers with PWM and compare-match modes. Its communication peripherals include SPI, I2C, USART, TWI, and universal-control ports, while the 10-bit ADC supports analog measurements. The ATmega328PB combines picoPower operation with the AVR enhanced RISC architecture. It supports serial programming through ISP and in-circuit debugging through JTAG, using interfaces that integrate with Microchip development tools. Read-while-write Flash operation and the peripheral set make the device suitable for compact embedded control systems that need both deterministic digital I/O and analog measurement. Typical uses include Arduino-compatible control boards, industrial automation modules, temperature and environmental monitors, motor and actuator controllers, small instruments, and low-power embedded products. Its 20 MHz processing capability and 27 I/O lines provide more interface flexibility than a basic 8-bit controller, while the 32-VFQFN package supports compact board layouts when careful thermal and assembly planning is applied. Designers should compare the ATMEGA328PB against the original ATMEGA328P because the B revision adds I/O functionality and may use different fuse defaults. Existing layouts should also be checked for connections to the affected pins before treating the PB as a replacement. The industrial temperature option and dense leadless package make assembly, inspection, and rework more demanding than through-hole or larger-pitch packages. This page consolidates verified manufacturer specifications, distributor availability, practical application guidance, and package considerations for engineers evaluating the ATMEGA328PB-MN. It distinguishes documented specifications from unverified or unavailable details so procurement and design decisions can be made without relying on assumed pin mappings, pricing tiers, or unsupported cross-brand equivalency.

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ATMEGA328PB-MNR

ATMEGA328PB-MNR - 20MHz 8-Bit AVR MCU | Microchip Technology

Microchip Technology ATMEGA328PB-MNR is a low-power, 8-bit AVR enhanced-RISC microcontroller operating up to 20 MHz, with 32 KB of Flash program memory, 2 KB of EEPROM, 4 KB of SRAM, and 27 general-purpose I/O lines in a 32-VFQFN 5 mm × 5 mm package. The device combines an AVR CPU, I2C, SPI, UART, two flexible timer/counters, and picoPower technology for embedded-control applications. A microcontroller is a programmable semiconductor that integrates a CPU core, memory, and peripherals into one compact device. The ATmega328PB belongs to the hierarchy of 8-bit MCU -> AVR microcontroller -> RISC embedded controller -> semiconductor. It executes instructions in a single clock cycle, providing throughput close to 1 MIPS per MHz, making it suitable for compact control systems that must combine responsive processing with low power consumption. Key features include 32 KB of Flash memory organized as 16K × 16, 4 KB of internal SRAM, 2 KB of EEPROM, 27 general-purpose I/O pins, and 32 general-purpose working registers. The ATmega328PB also provides I2C, SPI, and UART interfaces. Its picoPower implementation supports low-power operation, while the 20 MHz maximum clock rate provides useful processing headroom for control, communication, and peripheral coordination tasks. The AVR enhanced-RISC architecture uses a Harvard-style organization with separate program-memory and data-memory spaces. Flash supports read-while-write operation, allowing the MCU to continue operating from one Flash page while another page is programmed. The two flexible timer/counters support timing and waveform-generation tasks, while the serial peripherals enable connection to sensors, displays, transceivers, and service interfaces without requiring multiple external controller packages. Typical applications include Arduino-compatible embedded modules, compact industrial controllers, battery-powered condition-monitoring equipment, serial data concentrators, hobby robotics, and small sensor nodes. The 32-VFQFN package also helps reduce board area, although its fine pitch and exposed-pad construction require careful PCB layout and assembly planning. Designers should follow the manufacturer datasheet for the complete 32-pin assignment, exposed-pad connection, decoupling requirements, and programming interface. The exposed thermal pad must be connected to the supply and ground planes as specified, while high-current supply and return paths should be arranged to minimize switching-loop area and maintain stable operation. This product record combines verified manufacturer and distributor information with practical application guidance, interface selection, pricing context, and same-package replacement analysis. It is intended to help engineers identify whether the ATMEGA328PB-MNR fits a compact 8-bit embedded-control design without overlooking package, memory, peripheral, or programming constraints.

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ATMEGA328PB-MU

ATMEGA328PB-MU - 8-Bit AVR MCU 20MHz 32KB Flash | Microchip

The Microchip Technology ATMEGA328PB-MU is a picoPower 8-bit AVR RISC microcontroller delivering 20 MHz maximum clock frequency, 32 KB of ISP Flash memory, and 2 KB of SRAM in a 32-pin VFQFN (5x5 mm) surface-mount package. It achieves throughput close to 1 MIPS per MHz, and the -MU suffix denotes the industrial temperature grade of -40C to +85C in the QFN/MLF package. An 8-bit AVR microcontroller is a self-contained computing IC that integrates a RISC CPU core, program Flash, SRAM, EEPROM, and peripherals such as timers, USART, SPI, and I2C on a single die. Within the power-management hierarchy of embedded systems, it functions as the system controller, executing application firmware while managing sensors, actuators, and communication links. Key features include two 8-bit timer/counters with PWM, one 16-bit timer/counter, and enhanced peripheral sets relative to the ATmega328P: two independent I2C interfaces, two SPI interfaces, additional GPIO on PORTE, and a 10-bit ADC with 7 multiplexed channels. The picoPower technology supports multiple sleep modes for battery-operated designs, and the device executes powerful instructions in a single clock cycle. The AVR enhanced RISC architecture pairs 32 general-purpose working registers directly with the ALU, allowing most instructions to complete in one cycle and delivering deterministic, interrupt-friendly real-time behavior. Flash read-while-write capability enables in-system self-programming via a boot loader, and ISP plus debugWIRING support simplifies field updates and development. Typical applications include Arduino-compatible boards and maker platforms, industrial sensor nodes and HMI controllers, and consumer appliances requiring low-cost, low-power control with robust community tooling. When designing with this device, verify that your firmware and fuse settings are written for the 328PB signature, because the added Port E pins (19 and 22 in the QFN) change connectivity relative to the ATmega328P footprint. This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not consolidated in the manufacturer datasheet.

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ATMEGA328PB-MUR

ATMEGA328PB-MUR - 8-Bit AVR MCU 20MHz 32KB Flash QFN-32 | Microchip

The Microchip Technology ATMEGA328PB-MUR is a low-power 8-bit AVR RISC microcontroller delivering 20 MHz maximum clock frequency, 32 KB of ISP Flash memory, and 4 KB SRAM in a 32-pin VFQFN (5x5 mm) package rated for industrial temperatures from -40C to +85C. As the picoPower successor to the ATmega328P, it achieves throughputs close to 1 MIPS per MHz. An 8-bit AVR microcontroller is a Harvard-architecture processor that executes most instructions in a single clock cycle, combining program Flash, data SRAM, and EEPROM on one die. Within the power management and embedded control hierarchy, MCUs like the ATmega328PB sit at the heart of industrial sensors, consumer appliances, and hobbyist platforms such as Arduino-compatible boards. Key differentiating features include two 8-bit timer/counters and two 16-bit timer/counters with compare modes and PWM, one UART with hardware LIN support, two I2C (TWI) interfaces, and two SPI interfaces - double the peripheral set of the ATmega328P. An 11-channel 10-bit ADC with differential programmable-gain inputs, 27 general purpose I/O lines, and a 32-general-purpose-register file round out the analog and digital capability. The picoPower technology suite provides multiple sleep modes (Idle, ADC Noise Reduction, Power-save, Power-down, Standby, Extended Standby) with wake-up via interrupt, plus an on-chip debug capability via debugWIRE. The AVR enhanced RISC core executes powerful instructions in single cycles, and self-programmable Flash with read-while-write support enables in-system programming and boot-loader firmware updates without an external programmer. Typical applications include battery-powered sensor nodes where picoPower sleep modes extend battery life, industrial control panels using the dual SPI/I2C buses for multi-peripheral designs, and Arduino-compatible consumer products. The 32-VFQFN 5x5 mm footprint suits space-constrained PCBs while remaining hand-solderable with hot air. Design consideration: the ATmega328PB is software-backward-compatible with the ATmega328P but exposes its added Port E and second I2C/SPI buses on pins that differ, so verify the 32-pin VFQFN pin map before reusing a legacy ATmega328P footprint. This page synthesizes distributor pricing, drop-in alternatives, application guidance, and design notes not found in the manufacturer datasheet alone.

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ATMEGA329-16AI

ATMEGA329-16AI - 8-bit AVR MCU 32KB Flash 16MHz LCD | Microchip

The Microchip Technology ATMEGA329-16AI is an 8-bit AVR RISC microcontroller with 32KB ISP Flash memory, 2KB SRAM, 1KB EEPROM, a 16MHz maximum core clock, and an integrated segment LCD controller, housed in a 64-pin TQFP (14x14 mm) package. An 8-bit AVR microcontroller is a member of the broader microcontroller (MCU) family of integrated circuits that combine a processor core, program memory, data memory, and peripherals on a single chip. Within the power-management-free general-purpose MCU hierarchy, AVR devices sit alongside PIC and ARM Cortex-M MCUs, executing most of their 130 powerful instructions in a single clock cycle to deliver throughput approaching 1 MIPS per MHz. Key features of the ATMEGA329-16AI include 54 general-purpose I/O lines, 32 general-purpose working registers, a JTAG interface for on-chip debugging and boundary scan, and self-programming Flash with read-while-write capability. Peripherals include an 8-channel 10-bit ADC, SPI, UART/USART, and USI serial interfaces, plus Brown-out Detect/Reset, Power-on Reset, PWM outputs, a Watchdog Timer, and the segment LCD driver that distinguishes this device from the LCD-less ATmega328 family. Architecturally, the AVR uses a Harvard structure with separate program and data buses, enabling single-cycle instruction fetch and execution. The -16AI ordering code specifies 16MHz speed grade, industrial temperature range of -40C to +85C, and TQFP packaging. Operating supply spans 2.7V to 5.5V, with the full 16MHz operation targeted at the 4.5V to 5.5V range. Typical applications include industrial control panels driving segment LCDs, utility metering and instrumentation where the integrated LCD controller reduces external component count, and consumer electronics requiring robust 5V operation with in-system programmable firmware updates. Design consideration: validate that the crystal frequency and supply voltage pair keeps the device within its safe operating envelope - at 5V the 16MHz grade is comfortable, but at 2.7V the maximum safe clock frequency drops substantially. This page synthesizes distributor availability data, same-family drop-in alternatives, and practical design notes not consolidated in the manufacturer datasheet.

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ATMEGA329-16AU

ATMEGA329-16AU - 8-bit AVR MCU 16MHz 32KB Flash LCD | Microchip

The Microchip Technology ATMEGA329-16AU is an 8-bit AVR ATmega microcontroller with 32 KB ISP Flash, 16 MHz max clock, and an on-chip LCD controller, housed in a 64-pin TQFP (14x14 mm) surface-mount package. It operates from a 4.5 V to 5.5 V supply at the 16 MHz speed grade. An AVR ATmega microcontroller is an 8-bit RISC-based MCU belonging to the broader microcontroller and embedded processor family. AVR devices execute most of their 130-plus powerful instructions in a single clock cycle, giving high code efficiency from small program memory. Microcontrollers of this class combine CPU, program Flash, data SRAM, EEPROM, and peripherals such as timers, USART, ADC, and - in this device - a complete LCD driver on one silicon die, forming the heart of an embedded system. Key features include 32 KB of self-programming ISP Flash with read-while-write capability, 1 KB EEPROM, 2 KB SRAM, and 54 general purpose I/O lines. A JTAG interface provides boundary-scan, on-chip debugging, and programming. The integrated LCD controller with internal contrast control drives segment LCDs directly, a capability uncommon in general-purpose MCUs of this era, and three flexible timers plus a 10-bit ADC round out the analog and timing peripherals. Architecturally, the device uses the AVR enhanced RISC core with 32 general purpose working registers directly connected to the ALU, allowing most single-cycle execution. In-system programmable Flash enables firmware updates on the assembled board through SPI or JTAG, reducing rework cost in production. Typical applications include utility metering with segment LCD displays, industrial panels and human-machine interfaces, and battery-powered or line-powered instrumentation requiring direct LCD drive, timers, and ADC acquisition. Design consideration: at 16 MHz the part must run from 4.5 V to 5.5 V; for 3 V systems choose a V speed grade variant and reduce the clock accordingly, and always place 100 nF decoupling on both VCC pins. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA329-16AUR

ATMEGA329-16AUR - AVR 8-bit MCU 16MHz 32KB LCD | Microchip

The Microchip Technology ATMEGA329-16AUR is a high-performance, low-power 8-bit AVR RISC microcontroller with 32 KB ISP Flash memory, 1 KB EEPROM, 2 KB SRAM, an integrated LCD controller, and a maximum clock speed of 16 MHz, housed in a 64-pin TQFP (14x14 mm, 0.8 mm pitch) surface-mount package. It operates from a 4.5 V to 5.5 V supply and is qualified for an industrial temperature range. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most of its 131 powerful instructions in a single clock cycle, sitting within the broader hierarchy of microcontrollers as a member of the AVR ATmega family of power-management-capable embedded processors. The integrated segment LCD driver distinguishes the ATmega329 from general-purpose parts such as the ATmega328P, making it a strong fit for battery-fronted display products. Key features include read-while-write self-programming Flash, 54 general-purpose I/O lines, 32 general-purpose working registers, a JTAG (IEEE 1149.1 compliant) boundary-scan and on-chip debug interface, an 8-channel 10-bit ADC, and an on-chip LCD controller capable of driving up to 4x25 segment/common combinations with three selectable duty schemes. The advanced RISC architecture achieves up to 16 MIPS throughput at 16 MHz. Technically, the device combines a fast single-cycle ALU with in-system self-programmable Flash, allowing firmware updates in the field without a separate programmer. Power management is handled through idle, ADC noise reduction, power-save, power-down, and standby sleep modes. Typical applications include utility metering with LCD displays, handheld measurement instruments, industrial control panels, and consumer appliances requiring integrated segment-LCD drive. A key design consideration is the 5 V supply requirement: the -16 speed grade needs 4.5 V to 5.5 V, so battery designs should consider the ATmega329V low-voltage variant instead. This page synthesizes distributor pricing, drop-in alternatives within the same 64-TQFP footprint, and practical design notes not found in the manufacturer datasheet.

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ATMEGA329-16MU

ATMEGA329-16MU - 8-Bit AVR MCU 16MHz 32KB LCD | Microchip

The Microchip Technology ATMEGA329-16MU is a high-performance, low-power 8-bit AVR RISC microcontroller with 32 KB ISP Flash memory, 1 KB EEPROM, 2 KB SRAM, an integrated LCD controller, and a maximum clock speed of 16 MHz, housed in a 64-pad QFN (9 x 9 mm) package. A microcontroller (MCU) is a single integrated circuit that combines a processor core, memory, and programmable peripherals into one chip, forming the lowest programmable layer of an embedded system hierarchy that ranges from discrete logic up to full application processors. The AVR family, originally developed by Atmel and now part of Microchip Technology, is an advanced RISC architecture executing 131 powerful instructions, most in a single clock cycle, with 32 general-purpose working registers directly connected to the ALU. Key features of the ATMEGA329 include 54 general purpose I/O lines, an on-chip LCD controller capable of driving up to 25 segments x 4 commons, a JTAG interface for on-chip debugging and programming, read-while-write self-programming Flash, and an 8-channel 10-bit ADC. Supply voltage is 4.5 V to 5.5 V for the 16 MHz speed grade, fitting standard 5 V industrial rails. The Harvard architecture separates program and data buses, allowing fetch and execution in parallel and delivering up to 16 MIPS throughput at 16 MHz. In-System Programmable Flash permits firmware updates over SPI without removing the device from the PCB, and the JTAG boundary-scan capability supports production test flows. Typical applications include utility metering with segmented LCD displays, industrial control panels, battery-powered instrumentation, and building automation front-ends, where the integrated LCD controller removes the need for a separate LCD driver IC. When designing, verify that the 4.5 V to 5.5 V supply window is met before running at the full 16 MHz clock; for 3 V systems choose the V speed grade variant instead. This page synthesizes verified distributor data, drop-in same-family alternatives, and practical design guidance not consolidated in the manufacturer datasheet.

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ATMEGA329-16MUR

ATMEGA329-16MUR - 32KB Flash 16MHz AVR MCU, 64-QFN | Microchip

The Microchip Technology ATMEGA329-16MUR is a high-performance, low-power 8-bit AVR RISC microcontroller with 32 KB ISP Flash memory, 1 KB EEPROM, 2 KB SRAM, and a maximum clock speed of 16 MHz, operating from a 4.5V to 5.5V supply and housed in a 64-pin QFN (9x9 mm) package with exposed pad. It integrates an LCD controller driving up to 25 segments x 4 commons, 54 general purpose I/O lines, a 10-bit ADC, and a JTAG interface for on-chip debugging and programming. 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 embedded processors: microcontroller -> embedded processor -> semiconductor device. The AVR ATmega family is widely used for cost-sensitive embedded control where flash self-programming, low power modes, and rich peripherals are required without an external memory bus. Key features include 131 powerful instructions with mostly single-cycle execution, read-while-write self-programming flash, 32 general purpose working registers, an on-chip 10-bit ADC with up to 8 channels, and an integrated segment LCD driver that eliminates an external LCD controller. These capabilities reduce bill-of-materials cost in battery-meter, metering, and panel-display designs. Technically, the ATmega329 combines an AVR core running up to 16 MIPS at 16 MHz with six power-saving modes, including power-down at very low current. The JTAG boundary-scan capability complies with IEEE 1149.1-style test access for board-level test, and in-circuit serial programming (ICSP) via SPI simplifies production programming. The 64-QFN 9x9 mm, 0.8 mm pitch package suits compact two-layer and four-layer boards with good thermal dissipation through the exposed pad. Typical applications include LCD-equipped industrial panels, utility and energy metering front ends, building automation controllers, and consumer appliances requiring segment-LCD user interfaces. The ADC and analog comparator support sensor acquisition tasks directly. Design consideration: this is the 16 MHz / 4.5V to 5.5V speed-voltage grade; for 2.7V to 5.5V systems at up to 10 MHz, the ATmega329V variant must be selected instead, as the -16 suffix guarantees full timing only within 4.5V to 5.5V. This page synthesizes distributor pricing, drop-in alternatives, design notes, and FAQ content not found in the manufacturer datasheet, giving engineers a single citable reference for the ATMEGA329-16MUR.

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ATMEGA3290-16AI

ATMEGA3290-16AI - AVR 8-bit MCU 16MHz 32KB TQFP-100 | Microchip

The Microchip Technology ATMEGA3290-16AI is a picoPower AVR RISC 8-bit microcontroller with 32 KB ISP Flash, 2 KB SRAM, 1 KB EEPROM, and 16 MHz maximum clock speed, supplied in a 100-pin TQFP (14 x 14 mm) package for industrial temperature ranges of -40C to +85C. A microcontroller unit (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and peripherals into one chip, forming the lowest tier of the embedded processing hierarchy below application processors and system-on-chip devices. The AVR ATmega family uses an advanced RISC architecture with 130 mostly single-cycle instructions and 32 general-purpose working registers, allowing one instruction per clock cycle for efficient C and assembly code execution. Key features of the ATMEGA3290-16AI include self-programming Flash with read-while-write capability for in-system updates, 69 general-purpose I/O lines for large button- and display-intensive designs, an integrated LCD controller driving up to 100/132 LCD segment configurations, and serial connectivity via SPI, UART/USART, and USI interfaces. The picoPower technology supports multiple sleep modes, minimizing power draw in battery-operated and standby-critical systems. Technically, the device operates from 2.7 V to 5.5 V and achieves 16 MIPS throughput at 16 MHz. The built-in LCD driver eliminates an external LCD controller, reducing BOM cost and board area in segmented-display products. The JTAG interface supports on-chip debugging and boundary-scan testing of the dense 100-lead footprint. Typical applications include industrial control panels with segmented LCDs, utility metering front ends, HVAC and appliance user interfaces, and security or access-control terminals where many I/O and a local display coexist on one controller. Design consideration: clock selection and BOD fuse settings strongly influence both power consumption and reset reliability; verify fuse configuration before production programming, since the TQFP-100 package makes field rework impractical. This page adds distributor pricing context, drop-in alternatives within the ATmega LCD family, and practical design guidance synthesized from multiple sources beyond the manufacturer datasheet.

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ATMEGA3290A-AU

ATMEGA3290A-AU - 8-bit AVR MCU 32KB Flash LCD | Microchip

The Microchip Technology ATMEGA3290A-AU is an 8-bit AVR RISC microcontroller with 32KB ISP Flash, 2KB SRAM, 1KB EEPROM, and an integrated LCD controller driving up to 4x40 segments, packaged in a 100-pin TQFP (14x14 mm) footprint rated for 20 MHz operation. An 8-bit AVR microcontroller is a Harvard-architecture RISC processor in the broader microcontroller (MCU) hierarchy: microcontroller -> embedded processor -> system-on-chip building block. AVR devices execute most of their 130 powerful instructions in a single clock cycle, and the ATmega family adds in-system programmable (ISP) Flash with read-while-write support, making field firmware updates straightforward without a separate programmer socket. Key features of the ATMEGA3290A-AU include 69 general-purpose I/O lines, 32 general-purpose working registers, a JTAG interface for boundary-scan, on-chip debugging and programming, and a complete on-chip LCD controller with internal contrast control. The internal oscillator option reduces external component count, while three flexible timers (two 8-bit with separate prescaler and compare mode, one 16-bit) cover PWM, capture, and timing tasks. Technically, the ATmega3290A belongs to the ATmega3290/3290P/6490 LCD megAVR family. The advanced RISC pipeline delivers close to 20 MIPS at 20 MHz, and the LCD driver directly drives segment glass for metering and human-machine interface panels, removing the need for an external LCD controller. EEPROM retention and ISP Flash endurance support data logging and frequent firmware updates in industrial products. Typical applications include utility metering displays, industrial HMI panels with segmented LCDs, building automation keypads, and battery-powered instrumentation where the low-power AVR core and integrated LCD driver minimize board area and quiescent current. When designing with this part, confirm the exact operating voltage range and LCD bias configuration against the manufacturer datasheet, and reserve JTAG header access for in-circuit debug. Note the distinction between the 'A' (standard) and 'P'/'PA' (picoPower) variants when sleep current is critical. This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA3290P-20AU

ATMEGA3290P-20AU - AVR 8-Bit MCU 20MHz 32KB Flash TQFP-100 | Microchip

The Microchip Technology ATMEGA3290P-20AU is a picoPower AVR 8-bit RISC microcontroller delivering 20 MHz maximum clock frequency, 32 KB of ISP self-programming Flash memory, and 69 general-purpose I/O lines in a 100-pin TQFP (14x14 mm, 0.8 mm pitch) package, operating from a 4.5 V to 5.5 V supply. An 8-bit AVR microcontroller is a Harvard-architecture processor that executes most instructions in a single clock cycle, positioning it within the broader hierarchy of microcontroller units (MCUs) under the power-management and embedded-control category. The ATmega family from Atmel (now Microchip Technology) remains one of the most widely deployed 8-bit MCU platforms in industrial and consumer embedded design. Key features of the ATMEGA3290P-20AU include 1 KB of EEPROM with self-programming Flash read-while-write capability, 2 KB of internal SRAM, 32 general-purpose working registers, and the picoPower low-power technology for battery-sensitive designs. The device integrates an on-chip LCD controller with segment drive capability, making it distinct from LCD-less siblings such as the ATmega3250 series in footprint-compatible design reuse scenarios. The advanced RISC core executes 131 powerful instructions, most in a single clock cycle, with hardware multipliers and in-circuit debugging (debugWIRE) plus In-Circuit Serial Programming (ICSP) support through tools such as the MPLAB SNAP programmer connected via an 8-pin SIL connector using two device I/O pins and the reset line. Typical applications include industrial instrumentation with integrated segment-LCD user interfaces, building automation panels, metering equipment, and portable test instruments where 5 V noise immunity, large I/O counts, and LCD drive are required on a single chip. A key design consideration is that the -20AU speed grade requires a 4.5 V to 5.5 V supply for full 20 MHz operation; lower-voltage picoPower variants such as the ATMEGA3250V-8AUR trade clock speed for supply range. This page adds value beyond the datasheet by consolidating distributor pricing (from $12.02 at LCSC as of 2026-09-17), verified drop-in alternatives within the same 100-TQFP footprint, cross-part comparison tables, and practical design guidance not found on standard distributor pages.

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ATMEGA3290P-20AUR

ATMEGA3290P-20AUR - AVR 8-Bit MCU 32KB 20MHz | Microchip

The Microchip Technology ATMEGA3290P-20AUR is a picoPower AVR 8-bit RISC microcontroller with 32 KB ISP Flash memory, 2 KB SRAM, 1 KB EEPROM, and 69 general-purpose I/O lines, running at up to 20 MHz in a 100-pin TQFP (14x14 mm) package rated for the industrial temperature range (-40C to +85C) and 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, making it a staple of the wider MCU hierarchy: microcontroller unit -> embedded processor -> semiconductor. The AVR ATmega family sits within Microchip's low-power CMOS portfolio, and the 'P' suffix in ATMEGA3290P denotes the picoPower-optimized die for low active and sleep currents. Key features include 130 powerful instructions, most executed in one clock cycle; 32 general-purpose working registers; read-while-write self-programming Flash; an on-chip LCD controller/driver suited to segmented glass displays; and In-Circuit Serial Programming (ICSP) with on-chip debug via JTAG. The 20 MHz rating enables 20 MIPS peak throughput at 5 V. The picoPower technology reduces power consumption in idle, power-save, power-down, and standby sleep modes, while the wide 2.7V to 5.5V supply range supports both 3.3V and 5V designs, with 5V operation required to reach the full 20 MHz speed grade. Typical applications include industrial HMI panels with segmented LCDs, battery-powered instruments and meters, building and HVAC controllers, and consumer appliances where the 69 GPIO lines drive keys, LEDs, relays, and displays from a single chip. When designing with this device, remember that the 20 MHz grade is only guaranteed across the full industrial range at 4.5V to 5.5V; at 3.3V the safe maximum clock is lower per the frequency-versus-voltage curve in the datasheet. This page synthesizes verified distributor data, drop-in ATmega family alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA3290PA-AU

ATMEGA3290PA-AU - 8-Bit AVR MCU, 32KB Flash, 20MHz | Microchip

The Microchip Technology ATMEGA3290PA-AU is a picoPower AVR 8-bit RISC microcontroller with 32 KB ISP Flash memory, 1 KB EEPROM, 2 KB SRAM, 69 general-purpose I/O lines, and a maximum clock speed of 20 MHz, housed in a 100-pin TQFP (14 x 14 mm) package. It also integrates an on-chip LCD controller with internal contrast control, making it one of the few MCU families with native segment-LCD drive capability. An 8-bit AVR microcontroller is a Harvard-architecture processor that executes most of its instructions in a single clock cycle. Within the power-management IC hierarchy, the ATmega family serves as the main system controller, sitting above simple logic devices and below 32-bit application processors, and is widely used for embedded control with human-machine interfaces. Key differentiating features include the picoPower technology that reduces power consumption in active, idle, and standby modes, 131 powerful instructions with mostly single-cycle execution, 32 general-purpose working registers, and an AVR-enhanced RISC architecture. The device operates from a 1.8 V to 5.5 V supply, supporting both battery-powered and 5 V industrial designs. Technically, the ATMEGA3290PA combines self-programming Flash with read-while-write capability, a JTAG interface for boundary-scan, on-chip debugging, and programming, a complete LCD controller driving segment and common lines with internal contrast control, plus standard AVR peripherals including timers, USART, SPI, and an ADC. The picoPower variant (PA suffix) improves on the earlier 3290P with lower quiescent and power-down currents. Typical applications include utility metering with LCD displays, battery-powered handheld instruments, industrial control panels, and building-automation front ends where a segment LCD and low average power are mandatory. A key design consideration is that the LCD controller requires careful selection of the LCD drive mode and frame frequency to balance contrast against power consumption; at 1.8 V operation the maximum clock frequency must also be derated per the datasheet speed-versus-voltage curve. This page synthesizes distributor availability, drop-in family alternatives, and practical design notes beyond what the manufacturer datasheet provides.

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ATMEGA3290PA-AUR

ATMEGA3290PA-AUR - 8-Bit AVR MCU 32KB 20MHz TQFP-100 | Microchip

The Microchip Technology ATMEGA3290PA-AUR is an 8-bit AVR ATmega microcontroller with 32KB (16K x 16) In-System Programmable Flash, 2KB SRAM, 1KB EEPROM, a 20MHz maximum clock, and an integrated 4x40 segment LCD driver, housed in a 100-pin TQFP (14x14 mm) package. An 8-bit microcontroller is a single-chip processor whose data bus is eight bits wide, executing one byte per instruction cycle. Within the power-management hierarchy, it integrates CPU, memory, timers, communication peripherals, and an LCD controller on one die, replacing multi-chip solutions and reducing board area, BOM cost, and system power. The AVR family is a Harvard-architecture RISC line originally developed by Atmel, now part of Microchip Technology. Key features include 131 powerful instructions with mostly single-clock-cycle execution, high throughput of up to 20 MIPS at 20MHz, and advanced power-management modes including idle, power-save, power-down, standby, and extended standby that exploit the picoPower technology of the PA suffix for ultra-low sleep currents. The embedded 4x40 segment LCD driver directly drives glass displays without external driver ICs, a differentiator that defines this device family. Architecturally, the device uses a Harvard design with separate program and data buses, self-programmable Flash for boot-loader firmware updates, and on-chip debug via debugWIRE. Peripherals include two 8-bit timer/counters with separate prescaler and compare mode, one 16-bit timer/counter, USART, SPI, and analog comparators typical of the ATmega LCD family. Typical applications include utility metering (electricity, water, gas meters with LCD glass), industrial control panels with segmented displays, and portable instruments where the picoPower sleep modes extend battery life for years. Design consideration: full 20MHz operation requires a supply of 4.5V to 5.5V; derate clock speed for lower supply voltages per the Speed/Grade versus Voltage curve in the manufacturer datasheet. This page synthesizes distributor availability, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA3290PV-10AUR

ATMEGA3290PV-10AUR - 8-bit AVR MCU, 32KB, LCD, TQFP-100 | Microchip

The Microchip Technology ATMEGA3290PV-10AUR is a picoPower AVR 8-bit microcontroller with 32KB (16K x 16) ISP Flash memory, 1KB EEPROM, 2KB SRAM, and a maximum clock frequency of 10 MHz, housed in a 100-pin TQFP (14x14 mm) surface-mount package. It operates from a 1.8V to 5.5V supply and integrates an on-chip segment LCD controller, making it a complete display-capable embedded controller. A microcontroller unit (MCU) is a single-chip computer that combines a processor core, program memory, data memory, and peripherals on one die. This device belongs to the AVR ATmega family of 8-bit RISC microcontrollers, positioned in the broader hierarchy of embedded processors used in industrial control, metering, and human-interface products. The AVR architecture executes most of its powerful instruction set in a single clock cycle, delivering up to 10 MIPS throughput at 10 MHz. Key features include in-system self-programmable Flash with read-while-write capability, picoPower low-power technology for battery-operated designs, an integrated LCD driver that offloads segment driving from software, 69 general-purpose I/O lines, and 32 general-purpose working registers directly connected to the ALU. The wide 1.8V to 5.5V operating range allows direct battery connection without a regulator in low-power systems. Technically, the device uses an advanced RISC core with single-cycle instruction execution, hardware multiplier, and nested interrupt controller. The 32KB Flash is organized for 10,000 write cycles, while the 1KB EEPROM provides non-volatile parameter storage. Peripherals typically include USART, SPI, and JTAG-based debugging on the ATmega3290 family, supporting both development and production programming. Typical applications include utility metering with LCD readouts, battery-powered industrial instruments, building automation panels, and handheld measurement devices where the integrated segment LCD controller, low active current, and five-volt tolerance simplify the bill of materials. When designing with this device, respect the 10 MHz maximum frequency of the V-grade speed bin and use decoupling capacitors on each supply pin; the LCD controller requires proper bias network configuration per the manufacturer datasheet. This page synthesizes distributor pricing, drop-in family alternatives, and practical design guidance not consolidated in the manufacturer datasheet.

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ATMEGA329-16AUR - AVR 8-bit MCU 16MHz 32KB LCD | Microchip

ATMEGA329-16MU - 8-Bit AVR MCU 16MHz 32KB LCD | Microchip

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ATMEGA3290-16AI - AVR 8-bit MCU 16MHz 32KB TQFP-100 | Microchip

ATMEGA3290A-AU - 8-bit AVR MCU 32KB Flash LCD | Microchip

ATMEGA3290P-20AU - AVR 8-Bit MCU 20MHz 32KB Flash TQFP-100 | Microchip

ATMEGA3290P-20AUR - AVR 8-Bit MCU 32KB 20MHz | Microchip

ATMEGA3290PA-AU - 8-Bit AVR MCU, 32KB Flash, 20MHz | Microchip

ATMEGA3290PA-AUR - 8-Bit AVR MCU 32KB 20MHz TQFP-100 | Microchip

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