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ATMEGA168-20MQR

ATMEGA168-20MQR - 8-bit AVR MCU 20MHz 16KB Flash | Microchip

The Microchip Technology ATMEGA168-20MQR is an 8-bit AVR RISC microcontroller executing up to 20 MIPS at 20 MHz, with 16 KB ISP flash memory, 512 B EEPROM, 1 KB SRAM, and 23 general-purpose I/O lines, housed in a 32-pin VQFN (5x5 mm) package with exposed pad, qualified for the extended -40C to +85C temperature range. An 8-bit microcontroller is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals on one die. Within the power-management hierarchy of embedded systems, the MCU sits at the application layer above analog front ends and power regulation, orchestrating sensors, actuators, and communication. The ATmega168 belongs to the AVR family created by Atmel (now Microchip Technology), renowned for its fast, single-cycle RISC architecture with 32 general-purpose working registers directly connected to the ALU. Key features include the 16 KB self-programmable flash with read-while-write support, a 10-bit ADC with 8 multiplexed channels (6 external channels plus ADC6/ADC7 available on the 32-pin QFN), and full serial connectivity via one USART, one SPI master/slave interface, and one two-wire (I2C-compatible) TWI interface. The AVR enhanced RISC core executes most instructions in a single clock cycle, and two flexible 8-bit timer/counters plus one 16-bit timer/counter with compare modes and PWM outputs enable precise motor control, lighting, and timing applications. On-chip debug is performed through in-circuit debugging (ICD) and In-Circuit Serial Programming (ICSP) using only two I/O pins and reset. Brown-out detection, an internal calibrated RC oscillator, and power-saving idle, ADC noise reduction, and power-down modes round out the peripheral set. Typical applications include industrial sensor nodes and automation control, consumer appliances and HVAC control boards, and embedded hobby/prototyping designs compatible with Arduino-class toolchains, where the 20 MHz speed and 16 KB flash cover mid-complexity firmware. A key design consideration is supply voltage versus clock speed: full 20 MHz operation requires a 4.5V to 5.5V supply, while lower-voltage 2.7V to 5.5V systems must derate maximum clock speed per the frequency-versus-voltage curve in the manufacturer datasheet. This page synthesizes distributor pricing, drop-in alternatives across the ATmega48/88/168/328 family, pinout data, and practical design notes not found in the manufacturer datasheet.

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ATMEGA168-20MU

ATMEGA168-20MU - 8-Bit AVR MCU 20MHz 16KB Flash | Microchip

The Microchip Technology ATMEGA168-20MU is an 8-bit AVR RISC microcontroller with 16KB ISP Flash, 1KB SRAM, 512B EEPROM, and 23 general-purpose I/O lines, executing at up to 20MHz from a 2.7V to 5.5V supply in a 32-pad VQFN (5x5 mm) surface-mount package. An 8-bit microcontroller is an integrated circuit that combines a processor core, program memory, data memory, and peripherals such as timers, UART, SPI, and ADC on a single chip. Within the power-management and system-hierarchy of embedded electronics, the MCU sits at the heart of an embedded system, controlling sensors, actuators, and communication interfaces. The AVR architecture, developed by Atmel and now part of Microchip Technology, uses a Harvard architecture with mostly single-cycle instruction execution, making it popular in both hobbyist and industrial designs. Key features of the ATMEGA168-20MU include advanced RISC architecture with 131 powerful instructions, 16KB of in-system self-programmable Flash with read-while-write capability, an 8-channel 10-bit ADC with internal bandgap reference, and debugWIRE on-chip debugging through the RESET pin. It also includes two 8-bit timers, one 16-bit timer, a usART serial interface, SPI, and I2C-compatible TWI, along with six PWM channels for motor and LED control. Technically, the device runs from 2.7V to 5.5V with a speed grade of 20MHz at 4.5V to 5.5V, giving designers the option to trade clock speed for lower power consumption through clock prescaling and sleep modes such as Idle, ADC Noise Reduction, Power-save, and Power-down. Typical applications include industrial control, consumer appliances, sensor nodes, motor control, and hobby/Arduino-class boards where the ATmega168's compatibility with Arduino bootloader toolchains is valuable. Design consideration: keep the supply decoupled with 100nF capacitors on VCC and AVCC, and be aware that ISP programming shares pins PB5-PB7, so series resistors should isolate programming circuitry from peripheral loads. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA168-20MUR

ATMEGA168-20MUR - AVR 8-Bit MCU 20MHz 16KB Flash | Microchip

The Microchip Technology ATMEGA168-20MUR is a high-performance, low-power 8-bit AVR RISC microcontroller with 16KB (8K x 16) ISP Flash memory, 20MHz maximum clock, and a 32-pin VQFN (5x5 mm) package, operating from 2.7V to 5.5V over the industrial temperature range. A microcontroller (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals such as timers, ADCs, and serial interfaces. Within the power management hierarchy of embedded systems, the 8-bit MCU family (ATmega -> AVR -> 8-bit RISC microcontroller -> semiconductor IC) occupies the entry-to-mid tier of embedded control, ideal for cost- and power-sensitive applications that do not require 32-bit processing power. Key features include 131 powerful instructions with most executed in a single clock cycle, delivering up to 20 MIPS throughput at 20MHz. The device combines 16KB self-programmable Flash with read-while-write support, 512B EEPROM, 1KB SRAM, 23 general-purpose I/O lines, and 32 general-purpose working registers. An 8-channel 10-bit ADC, three flexible timer/counters, USART, SPI, and I2C (TWI) serial interfaces round out the peripheral set, while debugWIRE enables on-chip debugging over a single pin. The advanced RISC Harvard architecture separates instruction and data buses for parallel fetch and execution. In-System Programmable (ISP) Flash permits firmware updates on the assembled PCB, and the ICSP interface uses only two I/O pins plus reset. Typical applications include industrial control and automation nodes, consumer appliances, and battery-powered portable instruments, where the 2.7V to 5.5V supply range and low-power modes extend battery life. Design consideration: at 20MHz operation the supply voltage must be 3.8V or higher per the speed-versus-voltage curve, so 5V rails are recommended for maximum clock rates. This page synthesizes distributor pricing, drop-in alternatives, pinout, and practical design notes not found in the manufacturer datasheet.

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ATMEGA168-20PU

ATMEGA168-20PU - 8-bit AVR MCU 16KB Flash 20MHz PDIP-28 | Microchip

The Microchip Technology ATMEGA168-20PU is an 8-bit AVR RISC microcontroller with 16KB ISP Flash memory, 20 MHz maximum clock speed, and 23 general-purpose I/O lines, housed in a 28-pin PDIP (DIP-28) through-hole package. It operates from a 2.7V to 5.5V supply and integrates 512B EEPROM, 1KB SRAM, and a 10-bit ADC. An 8-bit microcontroller (MCU) is a self-contained computing chip that integrates a processor core, program memory, data memory, and peripherals on a single die. Within the power-management and embedded hierarchy, the ATMEGA168 belongs to the AVR ATmega family of microcontroller ICs, which sit above bare logic ICs and below 32-bit application processors, making them ideal for compact embedded control tasks. Key features include the advanced AVR RISC architecture executing 133 powerful instructions - most in a single clock cycle - 32 general-purpose 8-bit working registers, 16KB of In-System Self-Programmable Flash with read-while-write capability, and debugWIRE on-chip debugging. The 20 MHz grade (the '-20' suffix) delivers up to 20 MIPS throughput at 5V, roughly 1 MIPS per MHz. The Harvard-architecture core accesses program and data memory through separate buses, allowing single-cycle instruction fetch. Peripheral set includes two 8-bit timers, one 16-bit timer, a 6-channel 10-bit ADC on the PDIP variant, USART, two-wire interface (I2C-compatible), SPI, analog comparator, and multiple sleep modes for low-power design. In-System Programming (ISP) via the SPI or debugWIRE interface allows firmware updates without removing the chip from the board. Typical applications include Arduino-compatible hobby and prototyping boards, industrial sensor nodes, home automation controllers, battery-powered instruments, and legacy through-hole designs where hand-solderability matters. The PDIP-28 package fits standard 0.1-inch sockets for rapid prototyping. Design tip: full 20 MHz operation is specified at 4.5V to 5.5V; at lower supply voltages the maximum safe clock frequency scales down per the datasheet frequency-versus-voltage curve. This page synthesizes verified distributor pricing, drop-in alternatives, PDIP-28 pinout data, and practical design notes not consolidated in the manufacturer datasheet.

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ATMEGA168A-AU

ATMEGA168A-AU - 8-Bit AVR MCU 16KB Flash 20MHz | Microchip

The Microchip Technology ATMEGA168A-AU is an 8-bit AVR RISC microcontroller with 16 KB of in-system programmable flash memory, 512 B EEPROM, 1 KB SRAM, and 23 general-purpose I/O lines, housed in a 32-pin TQFP (7x7 mm) package and rated for 20 MHz operation at 2.7 V to 5.5 V. An AVR microcontroller is a Harvard-architecture 8-bit RISC device that executes most instructions in a single clock cycle, sitting in the hierarchy of microcontroller -> embedded processor -> integrated circuit -> semiconductor. The ATmega168A family is the second-generation "A" revision of the classic ATmega168, adding improved brown-out detection, a calibrated internal RC oscillator, and enhanced EEPROM endurance while retaining full pin and code compatibility with the original ATmega168 and the picoPower ATmega168P/PA devices. Key features include 16 KB ISP flash with read-while-write capability, 512 B EEPROM rated for 100,000 write/erase cycles, 1 KB internal SRAM, 23 programmable I/O lines, 32 general-purpose working registers, three flexible timer/counters with compare modes, a serial programmable USART, a byte-oriented Two-Wire serial interface, and an SPI serial port. The device also integrates a 10-bit ADC, a programmable watchdog timer with internal oscillator, and six sleep modes for low-power operation. The ATmega168A uses Microchip's high-performance, low-power AVR 8-bit RISC architecture with 131 powerful instructions, most executing in a single clock cycle, achieving throughput approaching 1 MIPS per MHz. This allows the system designer to optimize power consumption versus processing speed. The 32-TQFP package measures 7x7 mm with a 0.8 mm pitch, making it suitable for compact surface-mount assemblies. Typical applications include Arduino-compatible development boards, industrial sensor nodes, battery-powered IoT endpoints, motor control, home automation, and portable instrumentation. The wide 2.7 V to 5.5 V supply range supports both 3.3 V and 5 V logic systems, and the integrated peripherals reduce external component count. When designing with this device, decouple VCC and AVCC with 100 nF ceramic capacitors placed close to the pins, and connect the AREF pin through a low-pass filter when using the ADC. The RESET pin requires an external pull-up or the internal pull-up must be enabled. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing engineers with a single reference for selection, replacement, and layout decisions.

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ATMEGA168A-AUR

ATMEGA168A-AUR - 8-bit AVR MCU 16KB 20MHz | Microchip

The Microchip Technology ATMEGA168A-AUR is an 8-bit AVR RISC microcontroller with 16 KB ISP FLASH memory, 20 MHz maximum clock frequency, and 2.7V to 5.5V supply voltage, housed in a 32-pin TQFP (7x7 mm) surface-mount package. An 8-bit microcontroller is an integrated circuit whose CPU processes data in 8-bit words, combining a processor core, program memory (FLASH), data memory (SRAM and EEPROM), and peripherals such as timers and serial interfaces on a single chip. MCUs sit at the heart of the embedded-systems hierarchy - below application processors but above simple logic ICs - serving as the primary control element in industrial, consumer, and automotive electronics. The ATMEGA168A executes 133 powerful instructions, most in a single clock cycle, achieving up to 20 MIPS throughput at 20 MHz. It provides 512 B of EEPROM with read-while-write FLASH capability, 1 KB of internal SRAM, and 23 general purpose I/O lines. Peripheral resources include a serial programmable USART, a byte-oriented two-wire serial interface (I2C/TWI), an SPI serial port, three flexible timer/counters with compare modes, and a 10-bit ADC. The AVR advanced RISC architecture uses 32 general purpose working registers directly connected to the ALU, allowing a single-cycle execution model that outperforms conventional CISC microcontrollers at equivalent clock rates. In-system programmability (ISP) allows firmware updates on the assembled PCB via SPI, reducing production cost and field-upgrade effort. Internal brown-out detection, power-on reset, and an enhanced power-save mode support robust, low-power designs. Typical applications include industrial control systems, HVAC and building automation, sensor nodes and battery-operated instruments, consumer appliances, and Arduino-compatible embedded boards where the pin-compatible ATmega family simplifies design migration. When designing with this device, keep the supply within 2.7V to 5.5V and respect the 20 MHz ceiling; below 8 MHz the part can operate across its full voltage range, so choose the clock accordingly. This page synthesizes verified distributor pricing, drop-in alternatives across the ATmega family, complete TQFP-32 pinout data, and practical design notes not consolidated in the manufacturer datasheet.

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ATMEGA168A-CCU

ATMEGA168A-CCU - 8-Bit AVR MCU, 16KB Flash, 20MHz | Microchip

The Microchip Technology ATMEGA168A-CCU is an 8-bit AVR RISC microcontroller with 16KB (8K x 16) In-System Programmable Flash, 512B EEPROM, 1KB SRAM, and a maximum clock speed of 20MHz, housed in a 32-ball UFBGA (4x4 mm) package. An 8-bit AVR microcontroller is a member of the broader voltage-regulator-free embedded processing hierarchy: microcontroller -> embedded processor -> semiconductor. AVR devices use an Advanced RISC architecture in which most of the 133 powerful instructions execute in a single clock cycle, allowing one MIPS per MHz of clock frequency. This makes the ATmega family a staple for cost-sensitive embedded control in the same category as PIC, STM8, and other 8-bit MCU families. Key features of the ATMEGA168A-CCU include Read-While-Write capable Flash for self-programming, 23 general purpose I/O lines, 32 general purpose working registers, and a Real Time Counter (RTC). The device integrates three flexible Timer/Counters with compare modes and PWM channels, one programmable USART for serial communication, and one byte-oriented 2-wire serial interface (I2C/TWI) plus SPI for connectivity. The supply voltage range of 2.7V to 5.5V supports both 3.3V and 5V logic systems, giving designers flexibility in mixed-voltage designs. In-System Programming (ISP) via the SPI interface and In-Circuit Serial Programming (ICSP), supported by tools such as the MPLAB SNAP debugger with an 8-pin SIL connector, allows firmware updates without removing the device from the PCB. Typical applications include industrial sensors and actuator control, consumer appliance control boards, battery-powered portable instrumentation, and hobby/embedded prototyping platforms. The compact 4x4 mm UFBGA ball grid array makes the part attractive for space-constrained portable designs where QFP footprint is too large. Design consideration: UFBGA packages require precise PCB pad geometry and reflow soldering processes; the BGA balls cannot be hand-soldered or visually inspected like QFP leads, so verify land patterns against the manufacturer datasheet before layout. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA168A-CCUR

ATMEGA168A-CCUR - 8-Bit AVR MCU 16KB Flash 20MHz | Microchip

The Microchip Technology ATMEGA168A-CCUR is a high-performance, low-power 8-bit AVR RISC microcontroller with 16 KB (8K x 16) in-system-programmable FLASH, 512 B EEPROM, 1 KB SRAM, and a maximum clock frequency of 20 MHz, housed in a 32-ball UFBGA (4 x 4 mm) package. It operates from a 2.7 V to 5.5 V supply and provides 23 general-purpose I/O lines. 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 level of the embedded-system hierarchy (MCU -> embedded processor -> microprocessor -> semiconductor device). The AVR family popularized single-cycle RISC execution, in which most of the 131 instructions complete in one clock cycle through 32 x 8 general-purpose working registers, delivering up to 20 MIPS at 20 MHz in fully static operation. Key features of the ATMEGA168A-CCUR include read-while-write FLASH for safe in-application self-programming, in-circuit serial programming (ICSP) via two I/O pins plus reset, and three flexible timers. The AVR core's Harvard architecture separates program and data buses, sustaining deterministic single-cycle execution that suits real-time control loops. Architecturally, the device belongs to the ATmega48/88/168 family, sharing a common pinout and register map across memory tiers. This lets designers scale FLASH from 4 KB to 16 KB without PCB redesign, and the ATmega168A is a low-power 'A' revision of the classic ATmega168. Typical applications include battery-powered sensor nodes, consumer appliance control, LED lighting controllers, and small motor-control boards, where 16 KB of code space and 20 MHz throughput cover the majority of mid-range embedded tasks. The compact 4 x 4 mm UFBGA footprint suits space-constrained two- and four-layer boards. A key design consideration is ball-grid rework: UFBGA packages require reflow soldering and X-ray or microsection inspection, so prototype iterations are slower than with QFP/QFN alternatives. Verify your assembly partner supports 0.5 mm-class BGA placement before committing to the CCU footprint. This page synthesizes distributor availability data, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet, with pricing and lifecycle verified as of 2026-09-16.

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ATMEGA168A-MMHR

ATMEGA168A-MMHR - 8-Bit AVR MCU 16KB Flash 20MHz | Microchip

The Microchip Technology ATMEGA168A-MMHR is an 8-bit AVR RISC microcontroller with 16 KB in-system programmable flash, 512 B EEPROM, 1 KB SRAM, and a 20 MHz maximum clock, housed in a 28-pin VQFN (4x4 mm) package. It delivers up to 20 MIPS throughput at 20 MHz and operates from 1.8 V to 5.5 V, making it a direct drop-in for space-constrained embedded designs. An AVR microcontroller is a Harvard-architecture 8-bit RISC device that executes most instructions in a single clock cycle. Within the product hierarchy, the ATmega168A sits under AVR 8-bit MCUs, then microcontrollers (MCU), then embedded processors and integrated circuits. The ATmega168A family is the mid-density member of the classic ATmega48/88/168/328 pin-compatible line, sharing the same 28-pin footprint and peripheral set so firmware can scale between memory densities without PCB changes. Key features include 16 KB flash with read-while-write, 512 B EEPROM for non-volatile parameter storage, 1 KB SRAM, 23 general-purpose I/O lines, 32 general-purpose working registers, and three flexible timers (two 8-bit, one 16-bit) with PWM. Peripherals include a 10-bit ADC, USART, SPI, and TWI (I2C) interfaces, plus an internal 8 MHz calibrated RC oscillator that removes the need for an external clock in many designs. The device uses Microchip's low-power AVR core with picoPower technology, supporting multiple sleep modes for battery operation. The 28-VQFN (4x4 mm) package with exposed pad provides a compact footprint for portable and wearable electronics while retaining the full 23 I/O lines of the larger TQFP-32 variant. Typical applications include Arduino-compatible development boards, battery-powered sensor nodes, motor control, and industrial automation front-ends. The 1.8 V to 5.5 V range allows direct operation from single-cell Li-Ion or 3.3 V/5 V rails. When designing, decouple VCC and AVCC with 100 nF ceramic capacitors placed close to the pins, and connect the exposed pad to ground for thermal and noise performance. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA168A-MU

ATMEGA168A-MU - 8-bit AVR MCU 16KB Flash 20MHz VQFN-32 | Microchip

The Microchip Technology ATMEGA168A-MU is an 8-bit AVR RISC microcontroller with 16 KB ISP flash memory, 512 B EEPROM, 1 KB SRAM, and 20 MHz maximum clock frequency, housed in a 32-pin VQFN (5x5 mm) package. An 8-bit microcontroller (MCU) is a single integrated circuit containing a processor core, memory, and programmable input/output peripherals. Within the power-management and embedded-control hierarchy, the ATmega168A belongs to the AVR family of reduced-instruction-set (RISC) controllers, positioned as the mid-memory variant of the ATmega48/88/168/328 product ladder. Such MCUs execute control, sensing, and communication tasks in embedded systems ranging from consumer appliances to industrial nodes. Key features include 133 powerful instructions with most executed in a single clock cycle, delivering up to 20 MIPS throughput at 20 MHz. The device offers 23 general-purpose I/O lines, 32 general-purpose working registers, three flexible timer/counters with compare modes, and both internal and external interrupt sources. Serial connectivity is comprehensive: a byte-oriented 2-wire interface (I2C/TWI), a programmable USART, and an SPI serial port. On-chip analog resources include a 6-channel 10-bit ADC in the QFN package variant. The AVR enhanced RISC architecture combines a rich instruction set with 32 general-purpose working registers directly connected to the arithmetic logic unit, allowing every register access to complete in one cycle. In-system programmable flash with read-while-write support permits firmware updates on the assembled board through SPI, and the picoPower-compatible low-power modes (idle, power-down, power-save) reduce consumption for battery designs. Typical applications include sensor acquisition nodes using the 10-bit ADC, motor and LED control via the timer PWM channels, and serial communication bridges using USART, SPI, or TWI. It is also a common choice for Arduino-compatible board designs and hobby-to-industrial migration paths. When designing with the ATMEGA168A-MU, ensure decoupling capacitors sit close to the multiple VCC/AVCC pins of the exposed-pad VQFN-32, and connect the exposed pad to ground for thermal and noise performance. This page synthesizes distributor availability data, drop-in alternatives, pinout detail, and practical design notes not consolidated in the manufacturer datasheet.

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ATMEGA168A-MUR

ATMEGA168A-MUR - 8-Bit AVR MCU 16KB Flash 20MHz | Microchip

The Microchip Technology ATMEGA168A-MUR is an 8-bit AVR RISC microcontroller with 16 KB in-system programmable flash, 512 B EEPROM, 1 KB SRAM, and a 20 MHz maximum clock, housed in a 32-pin VQFN (5x5 mm) package. It is the tape-and-reel variant of the ATmega168A family and is supplied in a 32-VQFN exposed-pad package for high-volume surface-mount assembly. An 8-bit AVR microcontroller is a single-chip computer that combines a RISC CPU core, non-volatile program memory, data memory, and integrated peripherals such as timers, serial interfaces, and analog-to-digital converters. Within the semiconductor taxonomy, the ATmega168A sits under 8-bit microcontrollers, which belong to the broader microcontroller unit (MCU) family, itself a subset of embedded processors and integrated circuits. The AVR architecture executes most instructions in a single clock cycle, giving roughly 20 MIPS at 20 MHz. Key features include 16 KB of flash with read-while-write support, 512 B of EEPROM for non-volatile parameter storage, 1 KB of SRAM, 23 general-purpose I/O lines, 32 general-purpose working registers, and three flexible timer/counters with compare modes. The device integrates a byte-oriented two-wire serial interface, a programmable serial USART, and an SPI serial port, plus a 10-bit ADC and an internal calibrated oscillator. The ATmega168A uses Microchip's high-performance, low-power AVR RISC architecture with 133 powerful instructions, most executing in a single clock cycle. The picoPower design keeps active and idle current low, and six sleep modes allow fine-grained power management. On-chip debug support via debugWIRE and in-system programming through SPI simplify development and field updates. Typical applications include consumer appliances, battery chargers, sensor nodes, motor control front-ends, and industrial control boards. The 2.7 V to 5.5 V supply range and -40 C to +85 C operating window make it suitable for both 3.3 V and 5 V systems, and the 32-VQFN package saves board area compared with TQFP alternatives. When designing with this device, decouple VCC and AVCC with 100 nF ceramic capacitors placed close to the pins, and keep the exposed pad soldered to a grounded thermal land. The reset pin should be pulled high through a 10 kOhm resistor, and the internal 8 MHz oscillator can eliminate an external crystal when 8 MHz accuracy is sufficient. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single reference for selection, replacement, and layout decisions.

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ATMEGA168P-20AN

ATMEGA168P-20AN - 16KB Flash 20MHz AVR MCU | Microchip

The Microchip Technology ATMEGA168P-20AN is a picoPower 8-bit AVR RISC microcontroller with 16 KB ISP Flash, 512 B EEPROM, 1 KB SRAM, 23 general-purpose I/O lines, and up to 20 MIPS throughput at 20 MHz, housed in a 32-pin TQFP (7x7 mm) package with industrial temperature rating. An 8-bit microcontroller (MCU) is a complete computing system on a single chip, combining a processor core, program memory, data memory, and peripherals such as timers, UART, SPI, I2C, and ADC. MCUs form the lowest layer of the embedded systems hierarchy - sitting below application processors and above discrete logic - and are the workhorses of consumer, industrial, and automotive electronics. Key features of the ATMEGA168P include 131 powerful RISC instructions with mostly single-cycle execution, 32 general-purpose working registers, a 10-bit ADC, three flexible timers/counters with compare modes, and in-system programmable Flash with read-while-write capability. The picoPower technology delivers low sleep-mode currents, making it suited to battery-powered designs. Architecturally, the AVR core uses a Harvard structure with separate program and data buses, achieving one MIPS per MHz. The picoPower process node reduces static leakage, and brown-out detection, power-on reset, and an internal calibrated RC oscillator reduce external component count. Typical applications include Arduino-compatible boards, industrial sensors and control nodes, motor control, consumer appliances, and battery-powered instrumentation. The 20 MHz speed grade supports demanding polling and interrupt workloads. Design consideration: operate from a 2.7 V to 5.5 V supply; at 5 V the full 20 MHz is available, but at lower voltages the maximum clock frequency is derated per the datasheet frequency-versus-voltage curve. This page synthesizes drop-in alternatives, pricing context, and practical design notes not found in the manufacturer datasheet, giving engineers a single citable reference.

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ATMEGA168P-20AU

ATMEGA168P-20AU - 8-Bit AVR 16KB Flash MCU | Microchip

The Microchip Technology ATMEGA168P-20AU is a high-performance picoPower 8-bit AVR RISC microcontroller with 16 KB of in-system programmable flash memory, 512 B EEPROM, 1 KB SRAM, and 23 general-purpose I/O lines, operating at up to 20 MHz from a 2.7 V to 5.5 V supply in a 32-pin TQFP (7x7 mm) package. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data memory, and peripherals such as timers, serial interfaces, and analog-to-digital converters. Within the semiconductor taxonomy, the ATmega168P sits under 8-bit microcontrollers, which belong to the broader embedded microcontroller family, itself a subset of integrated circuits. The AVR core uses a Harvard architecture with 32 general-purpose working registers and 133 powerful instructions, most executing in a single clock cycle, delivering up to 20 MIPS throughput at 20 MHz. Key features include 16 KB ISP flash with read-while-write capability, 512 B EEPROM for non-volatile parameter storage, 1 KB SRAM, three flexible timer/counters with compare modes, a 10-bit ADC, a programmable USART, and an SPI and TWI (I2C) interface. The picoPower technology reduces active and standby current, making the device suitable for battery-powered designs. The ATmega168P is fabricated on Microchip's low-power CMOS process and supports in-system programming and on-chip debug via the SPI-based ICSP interface, eliminating the need for a separate programmer in production. Its 23 I/O lines are grouped into three ports (PORTB, PORTC, PORTD), each with selectable internal pull-ups. Typical applications include consumer electronics, battery management, industrial control, sensor nodes, and hobbyist/Arduino-compatible platforms. The 32-TQFP package offers a compact 7x7 mm footprint with 0.8 mm pitch, well suited to automated surface-mount assembly. When designing with this device, decouple VCC and AVCC with 100 nF ceramic capacitors placed close to the pins, and connect the AREF pin through a low-pass filter when using the ADC. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA168P-20AUR

ATMEGA168P-20AUR - 8-bit AVR MCU 16KB Flash 20MHz | Microchip

The Microchip Technology ATMEGA168P-20AUR is a high-performance, low-power 8-bit AVR RISC microcontroller with 16 KB ISP flash memory, 1 KB SRAM, 512 B EEPROM, and 23 general-purpose I/O lines, executing up to 20 MIPS at 20 MHz in a 32-pin TQFP (7x7 mm) package. An 8-bit AVR microcontroller is a single-chip computer built around the AVR enhanced RISC architecture, in which most of the 131 powerful instructions execute in a single clock cycle. Within the power-management hierarchy, an MCU integrates a processor core, program flash, data SRAM, EEPROM, and peripherals such as timers, UART, SPI, I2C, and a 10-bit ADC on one die, replacing multi-chip solutions in embedded control systems. Key differentiating specifications include the picoPower technology for ultra-low sleep-mode consumption, an 8-channel 10-bit ADC, in-system self-programmable flash with read-while-write support, debugWIRE on-chip debugging, and an industrial temperature rating of -40C to +85C. The 20 MHz maximum clock and 5 V operation position this part between the low-speed 8 MHz variants and higher-memory ATmega328P devices. Architecturally, the ATmega168P pairs a fast-register-file RISC core (32 general-purpose working registers directly connected to the ALU) with Harvard-structured program and data buses. Two-cycle multiply hardware, three flexible timers with compare and PWM modes, a USART, and independent brown-out reset and watchdog circuits yield deterministic real-time behavior with minimal external components. Typical applications include hobby and commercial Arduino-compatible boards, industrial sensor nodes and actuator control, consumer appliance front panels, battery-powered instrumentation, and motor/PWM control loops. The picoPower feature set makes it especially well suited to battery-operated designs requiring microamp-level sleep currents. A key design consideration is supply-voltage versus clock-speed derating: above 8 MHz the device requires 4.5 V to 5.5 V operation, so a 3.3 V design must be clocked at 8 MHz or below per the manufacturer datasheet speed-versus-voltage curve. This page synthesizes verified distributor pricing, drop-in alternatives, pinout data, and practical design notes not consolidated in the manufacturer datasheet, delivering unique cross-reference value for sourcing and design engineers. Pricing references are as of 2026-09-16.

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ATMEGA168P-20MQR

ATMEGA168P-20MQR - 16KB AVR MCU, 20MHz, VQFN-32 | Microchip

The Microchip Technology ATMEGA168P-20MQR is a picoPower 8-bit AVR RISC microcontroller with 16KB ISP FLASH memory, 1KB SRAM, 512B EEPROM, and 23 general purpose I/O lines, executing at up to 20MHz (20 MIPS) in a 32-pin VQFN (5x5 mm) package with exposed pad. An 8-bit AVR microcontroller is a self-contained computing device that integrates a RISC processor core, program memory, data memory, and peripherals such as timers, ADC, and serial interfaces on a single chip. Within the embedded systems hierarchy, the ATmega family sits under the broader AVR MCU line, which belongs to Microchip's microcontroller and digital signal processing portfolio, and is programmed through the In-Circuit Serial Programming (ICSP) interface using tools such as the MPLAB SNAP. Key features include 131 powerful instructions with mostly single-cycle execution, 32 general purpose working registers, full static operation, and read-while-write FLASH capability for reliable firmware updates. The picoPower technology delivers extremely low sleep-mode consumption, making the device well suited to battery-operated designs. Peripherals include three flexible timer/counters with compare modes, an 8-channel 10-bit ADC, byte-oriented Two-Wire Interface (I2C), SPI serial port, and a programmable USART. Technically, the AVR advanced RISC architecture achieves throughput near 1 MIPS per MHz, allowing system designers to trade clock speed against power dissipation. Operating voltage spans 1.8V to 5.5V; full 20MHz operation requires a supply of 4.5V to 5.5V per the datasheet speed-versus-voltage curves, while lower voltages constrain maximum clock frequency. Typical applications include industrial sensor nodes, consumer appliance control boards, battery-powered metering, and hobby/embedded prototyping platforms compatible with Arduino-style ecosystems. For design, note that the ATMEGA168PA is the manufacturer-recommended newer device for new designs; the P variant remains in production but the PA offers lower active current at equivalent performance. This page synthesizes distributor pricing from DigiKey, Mouser, LCSC and Octopart, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA168P-20MU

ATMEGA168P-20MU - 8-bit AVR MCU 20MHz 16KB Flash | Microchip

The Microchip Technology ATMEGA168P-20MU is an 8-bit AVR RISC microcontroller with 16 KB ISP flash memory, 1 KB SRAM, 512 B EEPROM, and 23 general-purpose I/O lines, executing up to 20 MIPS at a maximum 20 MHz clock in a 32-pad VQFN (5x5 mm) package. An 8-bit AVR microcontroller is a Harvard-architecture MCU that executes most instructions in a single clock cycle, placing it in the embedded microcontroller hierarchy (AVR ATmega MCU -> 8-bit microcontroller -> microcontroller IC -> semiconductor). The ATmega family is widely used for cost-sensitive embedded control where flash self-programming and rich peripherals are required without an external memory interface. Key features include the picoPower technology for ultra-low power consumption, a 10-bit ADC with up to 8 channels in the QFN package, three flexible timer/counters with compare modes, and connectivity peripherals comprising I2C (TWI), SPI, and USART. The device operates from 1.8 V to 5.5 V, tolerating battery-powered and 5 V industrial environments alike. Architecturally, the ATMEGA168P-20MU combines 32 general-purpose working registers tightly coupled to the ALU, read-while-write flash for safe in-application firmware updates, debugWIRE on-chip debugging over the reset line, and in-circuit serial programming (ICSP). The picoPower sleep modes, including power-down at sub-uA levels, make it efficient for battery designs. Typical applications include industrial sensor nodes, consumer appliance control, hobby and maker platforms (Arduino-compatible designs), HVAC and building automation, and battery-operated portable instruments. The 20 MHz speed class supports control loops and protocol handling in these systems. Design consideration: the QFN-32 package exposes a central die pad that must be soldered to a grounded PCB pad for reliable operation and thermal dissipation; plan reflow accordingly. This page synthesizes distributor pricing, verified drop-in alternatives within the ATmega family, pinout data, and practical design notes not consolidated in the manufacturer datasheet.

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ATMEGA168P-20MUR

ATMEGA168P-20MUR - 8-Bit AVR MCU 20MHz 16KB Flash | Microchip

The Microchip Technology ATMEGA168P-20MUR is an 8-bit AVR RISC microcontroller delivering 20 MIPS throughput at 20 MHz, with 16 KB ISP FLASH memory, 512 B EEPROM, 1 KB SRAM, and 23 general-purpose I/O lines, housed in a 32-pad VQFN (5x5 mm, MLF) exposed-pad package. An 8-bit AVR ATmega microcontroller is a member of the AVR family of modified Harvard-architecture RISC processors, positioned in the system hierarchy as: ATmega168P -> ATmega family -> 8-bit AVR MCU -> microcontroller -> embedded processor. AVRs execute most instructions in a single clock cycle, which is why a 20 MHz ATmega168P achieves up to 20 MIPS - roughly 1 MIPS per MHz, higher effective throughput than many competing 8-bit cores at the same clock rate. Key features include the picoPower low-power technology with multiple sleep modes and sub-uA power-down current, a 10-bit ADC with up to 8 channels, three flexible timers (two 8-bit, one 16-bit with compare modes and PWM), a full-duplex USART, two-wire interface (I2C-compatible), SPI, and debugWIRE on-chip debugging. The part operates from 2.7 V to 5.5 V and is rated for the industrial temperature range of -40C to +85C, with the -20M speed grade valid at 4.5 V to 5.5 V. Architecturally, the device combines 32 general-purpose working registers directly connected to the ALU, allowing one-cycle execution of powerful instructions, and read-while-write FLASH for reliable in-system self-programming via the bootloader capability. Typical applications include Arduino-compatible boards (the ATmega168 is the classic Duemilanove-class core), industrial sensor nodes, consumer appliance controls, battery-powered picoPower designs, and motor/PWM control where the three timers and 6 PWM channels are valuable. Design consideration: choose the VCC operating point carefully - full 20 MHz operation requires 4.5 V to 5.5 V; at 2.7 V to 4.5 V the clock must be derated to 10 MHz per the AVR frequency-voltage curve. This page synthesizes distributor pricing, drop-in same-footprint alternatives, pinout, and practical design notes not consolidated in the manufacturer datasheet. Pricing shown is as of 2026-09-16.

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ATMEGA168P-20PU

ATMEGA168P-20PU - 8-Bit AVR MCU 20MHz 16KB Flash | Microchip

The Microchip Technology (Atmel) ATMEGA168P-20PU is a picoPower 8-bit AVR RISC microcontroller delivering 20 MIPS at 20 MHz, with 16KB ISP flash memory, 1KB SRAM, 512B EEPROM, and 23 general-purpose I/O lines in a 28-pin PDIP package rated for industrial temperatures. 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 integrates the CPU, program memory, data memory, timers, communication peripherals, and analog-to-digital converter on a single chip, making it a complete embedded control solution without external components. The ATmega168P family sits between the smaller ATmega48 and the larger ATmega328 in the AVR flash microcontroller lineup. Key features include 16KB of in-system-programmable flash with read-while-write support, a 10-bit ADC with up to 8 multiplexed channels (TQFP/QFN packages; 6 channels on PDIP), three flexible timer/counters with compare modes, and debugWIRE on-chip debugging. The picoPower technology enables low-power sleep modes for battery-operated designs, and supply voltage spans 2.7V to 5.5V. Architecturally, the AVR core uses 32 general-purpose working registers directly connected to the ALU, allowing one-cycle execution of most instructions - 133 powerful instructions in total. On-chip peripherals include USART, SPI, and two-wire (I2C-compatible) serial interfaces, plus a watchdog timer, brown-out detection, and power-on reset. Typical applications include hobbyist and Arduino-compatible boards, industrial sensor nodes, consumer appliance control, and low-power battery products where the through-hole PDIP package simplifies prototyping and rework. A key design consideration is clock selection: full 20 MHz operation requires 4.5V-5.5V; at 2.7V the maximum safe frequency is lower, so set fuse bits accordingly. This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA168PA-15MZ

ATMEGA168PA-15MZ - 8-bit AVR MCU 16KB Flash 20MHz | Microchip

The Microchip Technology ATMEGA168PA-15MZ is an 8-bit AVR RISC picoPower microcontroller with 16 KB ISP flash memory, 1 KB SRAM, 512 B EEPROM, and up to 20 MIPS throughput at 20 MHz, housed in a 32-pin QFN (5x5 mm) package with exposed pad and AEC-Q100 automotive qualification. A microcontroller unit (MCU) integrates a processor core, program memory, data memory, and peripherals on a single die, sitting at the center of the embedded systems hierarchy (MCU -> embedded processor -> semiconductor device). The AVR family uses a modified Harvard architecture in which most of its 131 instructions execute in a single clock cycle, so each megahertz of clock yields roughly one MIPS of effective throughput - a defining trait of 8-bit AVR RISC design. Key features include 23 general-purpose I/O lines, 32 general-purpose working registers, an 8-channel 10-bit ADC available in the QFN/MLF package, two 8-bit and one 16-bit timer with PWM, USI-capable serial interfaces (SPI, I2C, UART), debugWIRE on-chip debug, and picoPower sleep modes down to sub-uA currents. The PA suffix denotes the picoPower revision with lower power consumption than the original ATmega168. The device operates from 1.8V to 5.5V and across -40C to +125C, and is qualified to AEC-Q100 for automotive use. Read-while-write flash enables in-system self-programming, and a 4KB self-programming flash section supports bootloaders. Typical applications include automotive body and comfort modules, industrial sensor nodes, battery-powered metering, and motor control interfaces where 16 KB of code space and wide temperature range are sufficient. Design tip: use the debugWIRE pin (shared with RESET) for in-circuit debugging, and keep the exposed pad soldered to a ground pour for thermal and EMC performance. This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA168PA-ANR

ATMEGA168PA-ANR - 16KB AVR 8-Bit MCU 20MHz | Microchip

The Microchip Technology ATMEGA168PA-ANR is a picoPower 8-bit AVR RISC microcontroller with 16 KB of in-system programmable flash, 1 KB SRAM, and 512 bytes of EEPROM, running at up to 20 MHz and supplied from 1.8 V to 5.5 V, housed in a 32-pin TQFP (7x7 mm) package. It delivers up to 20 MIPS throughput at 20 MHz and integrates 23 general-purpose I/O lines, an 8-channel 10-bit ADC, and a debugWIRE on-chip debug interface. An AVR microcontroller is a Harvard-architecture 8-bit RISC device that executes most instructions in a single clock cycle, sitting within the hierarchy of microcontroller -> embedded processor -> integrated circuit -> semiconductor. The ATmega family is the classic general-purpose AVR line, and the PA suffix denotes the picoPower generation with reduced active and standby current for battery-powered designs. Key differentiators include 16 KB flash with read-while-write self-programming, 512 bytes of true EEPROM for non-volatile parameter storage, and a wide 1.8 V to 5.5 V supply that allows direct operation from single-cell Li-Ion or 3xAA battery stacks without a regulator. The 32-TQFP (7x7 mm) body keeps the footprint compact while exposing all 23 I/O lines. The device integrates three flexible timer/counters with compare modes, a programmable USART, a byte-oriented Two-Wire serial interface (I2C), an SPI port, internal and external interrupts, a 6-channel PWM, a programmable watchdog timer with separate oscillator, and brown-out detection. The 10-bit ADC with 8 multiplexed channels supports temperature sensing and analog front ends. Typical applications include battery-powered sensor nodes, consumer appliance control panels, motor control front ends, LED lighting controllers, and legacy Arduino-compatible designs. The 1.8 V minimum supply and sub-microamp power-down mode make it well suited to energy-harvesting and coin-cell products. A key design consideration is that the TQFP-32 land pattern is shared across the ATmega48PA/88PA/168PA family, so firmware can be scaled up or down without PCB changes. Decouple VCC and AVCC with 100 nF ceramic capacitors placed within a few millimeters of the pins, and keep the 32 kHz crystal traces short if using an external RTC crystal. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single reference for selection, replacement, and layout decisions.

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ATMEGA168PA-AU

ATMEGA168PA-AU - 8-bit AVR MCU 20MHz 16KB Flash TQFP-32 | Microchip

The Microchip Technology ATMEGA168PA-AU is a high-performance picoPower 8-bit AVR RISC microcontroller with 16 KB ISP FLASH memory, 512 B EEPROM, 1 KB SRAM, and up to 20 MIPS throughput at 20 MHz, housed in a 32-pin TQFP (7x7 mm) surface-mount package. A microcontroller unit (MCU) integrates a processor core, memory, and peripherals on a single chip, sitting at the center of the embedded-systems hierarchy: transistor -> logic IC -> microcontroller -> full system-on-chip. The AVR architecture uses a Harvard design with 32 general-purpose working registers directly connected to the ALU, allowing one-cycle execution of most instructions. Key features of the ATMEGA168PA-AU include 23 programmable I/O lines, a 6-channel 10-bit ADC, a USART, a byte-oriented Two-Wire Interface (TWI/I2C), an SPI serial port, three flexible timer/counters with compare modes, and six sleep modes down to power-save operation in the sub-1 uA range via the picoPower technology. The picoPower process delivers class-leading low-power operation: idle current, power-down, and standby modes support battery-powered designs. The enhanced RISC core executes most single-cycle instructions, and a two-cycle hardware multiplier accelerates digital signal processing tasks. In-system programmable (ISP) FLASH with read-while-write support enables field firmware updates. Typical applications include Arduino-compatible hobby and maker boards, industrial sensor nodes, consumer appliances, and low-cost automotive-adjacent control panels where moderate memory and low power are priorities. Design consideration: choose the internal 8 MHz RC oscillator for cost-sensitive designs, or drive the external 20 MHz crystal for maximum performance; brown-out detection should be enabled in noisy environments to prevent FLASH corruption. This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet.

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ATMEGA168PA-AUR

ATMEGA168PA-AUR - 8-bit AVR MCU 20MHz 16KB Flash TQFP-32 | Microchip

The Microchip Technology (Atmel) ATMEGA168PA-AUR is a high-performance, low-power picoPower 8-bit AVR RISC microcontroller with 16 KB of in-system programmable (ISP) Flash memory, 1 KB of SRAM, and 512 B of EEPROM, executing at up to 20 MHz and housed in a 32-pin TQFP (7 x 7 mm) package supplied on tape and reel. An 8-bit AVR microcontroller is a single-chip computer built around an advanced RISC architecture; in the wider system hierarchy it belongs to the MCU category under Integrated Circuits, sitting above discrete logic but below 32-bit application processors. ATmega-family MCUs execute most instructions in a single clock cycle and integrate program memory, data memory, and peripherals on one die, making them a mainstay of embedded control. Key features include the picoPower technology suite for microamp-level sleep currents, 23 general-purpose I/O lines, 32 general-purpose working registers, and three flexible timer/counters with compare modes. Peripherals include a serial programmable USART, a byte-oriented Two-Wire (I2C-compatible) interface, an SPI serial port, a 10-bit ADC with 8 single-ended channels (6 differential with programmable gain), and an internal calibrated RC oscillator, eliminating the need for an external crystal in many designs. Technically, the ATmega168PA combines 131 mostly single-cycle instructions with hardware multipliers, four power-saving modes (idle, ADC noise reduction, power-save, and power-down), brown-out detection, an on-chip debug interface, and in-system programmability via SPI. The PA variant extends the supply range down to 1.8 V with picoPower refinements over the original ATmega168, allowing direct operation from two alkaline cells or a single Li-ion cell with a regulator. Typical applications include battery-powered sensor nodes, industrial control panels, HVAC and appliance control, and Arduino-compatible hobby and prototyping boards (the Arduino Nano platform classically uses this 32-TQFP footprint). For design, remember that maximum clock frequency scales with supply voltage: 20 MHz requires 4.5-5.5 V, while operation at 1.8 V limits the safe clock to roughly 4 MHz per the datasheet frequency-voltage curve. This page synthesizes distributor pricing, verified drop-in alternatives, a complete TQFP-32 pinout, and practical design notes not consolidated in the manufacturer datasheet.

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ATMEGA168PA-CCU

ATMEGA168PA-CCU - 16KB Flash 20MHz AVR MCU 32-UFBGA | Microchip

The Microchip Technology ATMEGA168PA-CCU is a picoPower 8-bit AVR RISC microcontroller with 16 KB ISP flash memory, 1 KB SRAM, and 512 B EEPROM, running at up to 20 MHz in a 32-ball UFBGA (4x4 mm) package. A microcontroller unit (MCU) is a single integrated circuit that combines a processor core, memory, and programmable peripherals into one chip, forming the lowest tier of the embedded computing hierarchy: MCU -> embedded processor -> system-on-chip -> computing system. The AVR family pioneered single-cycle RISC execution, and the ATmega168PA belongs to the ATmega 8-bit flash MCU family alongside the ATmega88PA and ATmega328P. Key features include 131 powerful instructions with mostly single-clock-cycle execution, 32 x 8 general purpose working registers, fully static operation, 23 general purpose I/O lines, and an 8-channel 10-bit ADC. Connectivity spans I2C (TWI), SPI, and UART/USART interfaces, supporting common embedded communication buses without external controllers. The picoPower technology platform provides multiple sleep modes and low-power consumption characteristics suited to battery-operated designs. The 16 KB flash supports read-while-write operation and In-System Self-Programming, while the In-Circuit Serial Programming (ICSP) interface uses two I/O pins plus reset for debugging and programming, enabling rapid prototyping with tools such as the AVR debuggers. Typical applications include battery-powered sensor nodes, industrial control panels, consumer appliance controllers, and space-constrained portable devices where the compact 4x4 mm UFBGA footprint saves board area compared to TQFP alternatives. Designers should note that the UFBGA package requires reflow soldering and careful PCB fan-out; it cannot be hand-soldered or socketed like DIP variants. Verify supply-voltage range against the datasheet for the intended operating speed grade. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA168PA-CCUR

ATMEGA168PA-CCUR - 8-bit AVR MCU, 16KB Flash, 20MHz | Microchip

The Microchip Technology ATMEGA168PA-CCUR is an 8-bit AVR RISC microcontroller with 16KB of ISP flash memory, 1KB of SRAM, and 512B of EEPROM, executing up to 20 MIPS at a maximum 20MHz clock from a wide 1.8V to 5.5V supply, housed in a 32-ball UFBGA (4x4 mm) package supplied on tape and reel. An 8-bit AVR microcontroller is a single-chip integrated circuit that combines a RISC processor core, program memory, data memory, and peripherals such as timers, USART, SPI, I2C, and ADC on one die. Within the semiconductor hierarchy, it belongs to the microcontroller class of embedded processors, positioned under the broader categories of logic ICs and system-on-chip devices, and is programmed in-system through ICSP or debugWIRE. Key differentiating features include the picoPower technology suite for ultra-low sleep-mode consumption, brown-out detection and power-on reset for supply supervision, a programmable watchdog timer, and multi-channel 10-bit ADC with PWM outputs. The advanced AVR RISC architecture executes 131 powerful instructions, most in a single clock cycle, delivering deterministic real-time performance. Technically, the ATMEGA168PA pairs 32 general-purpose working registers directly to the ALU, achieving one-instruction-per-cycle throughput. The self-programming flash supports read-while-write firmware updates, and debugWIRE provides on-chip debugging over a single wire using only the reset line and two I/O pins, minimizing board-level debug infrastructure. Typical applications include battery-powered portable devices, consumer electronics, sensor nodes and IoT endpoints, and low-cost industrial control boards where the compact 4x4 mm UFBGA footprint and picoPower sleep modes extend battery life while conserving PCB area. When designing with this part, keep in mind that the fine 0.5 mm-class ball pitch of the UFBGA package requires controlled-impedance PCB fabrication and X-ray-capable assembly inspection; the trade-off for the tiny footprint is higher assembly cost than QFP alternatives. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATMEGA168-20MQR - 8-bit AVR MCU 20MHz 16KB Flash | Microchip

ATMEGA168-20MU - 8-Bit AVR MCU 20MHz 16KB Flash | Microchip

ATMEGA168-20MUR - AVR 8-Bit MCU 20MHz 16KB Flash | Microchip

ATMEGA168-20PU - 8-bit AVR MCU 16KB Flash 20MHz PDIP-28 | Microchip

ATMEGA168A-AU - 8-Bit AVR MCU 16KB Flash 20MHz | Microchip

ATMEGA168A-AUR - 8-bit AVR MCU 16KB 20MHz | Microchip

ATMEGA168A-CCU - 8-Bit AVR MCU, 16KB Flash, 20MHz | Microchip

ATMEGA168A-CCUR - 8-Bit AVR MCU 16KB Flash 20MHz | Microchip

ATMEGA168A-MMHR - 8-Bit AVR MCU 16KB Flash 20MHz | Microchip

ATMEGA168A-MU - 8-bit AVR MCU 16KB Flash 20MHz VQFN-32 | Microchip

ATMEGA168A-MUR - 8-Bit AVR MCU 16KB Flash 20MHz | Microchip

ATMEGA168P-20AN - 16KB Flash 20MHz AVR MCU | Microchip

ATMEGA168P-20AU - 8-Bit AVR 16KB Flash MCU | Microchip

ATMEGA168P-20AUR - 8-bit AVR MCU 16KB Flash 20MHz | Microchip

ATMEGA168P-20MQR - 16KB AVR MCU, 20MHz, VQFN-32 | Microchip

ATMEGA168P-20MU - 8-bit AVR MCU 20MHz 16KB Flash | Microchip

ATMEGA168P-20MUR - 8-Bit AVR MCU 20MHz 16KB Flash | Microchip

ATMEGA168P-20PU - 8-Bit AVR MCU 20MHz 16KB Flash | Microchip

ATMEGA168PA-15MZ - 8-bit AVR MCU 16KB Flash 20MHz | Microchip

ATMEGA168PA-ANR - 16KB AVR 8-Bit MCU 20MHz | Microchip

ATMEGA168PA-AU - 8-bit AVR MCU 20MHz 16KB Flash TQFP-32 | Microchip

ATMEGA168PA-AUR - 8-bit AVR MCU 20MHz 16KB Flash TQFP-32 | Microchip

ATMEGA168PA-CCU - 16KB Flash 20MHz AVR MCU 32-UFBGA | Microchip

ATMEGA168PA-CCUR - 8-bit AVR MCU, 16KB Flash, 20MHz | Microchip