ATMEGA168P-20MU - 8-bit AVR MCU 20MHz 16KB Flash | Microchip
料号： ATMEGA168P-20MU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.45 | $2.45 |
| 10 | $2.2 | $22.00 |
| 100 | $1.86 | $186.00 |
| 500 | $1.62 | $810.00 |
| 1,000 | $1.38 | $1,380.00 |
ATMEGA168P-20MU 概述
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.
直接替换替代料： ATMEGA168P-20MU ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATMEGA168P-20MU （相同外形与封装尺寸） ——差异在于 Package, Operating Temperature, Flash Memory, RoHS Status, ADC.
快速对比工具——选择替代料号进行并排对比：
ATMEGA168PA-MU
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.72 / 个
查看数据手册 →ATMEGA168-20MU
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →ATMEGA168A-MU
✅ 直接替换✓ 有现货
$1.38 / 个
查看数据手册 →ATMEGA328P-MU
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.85 / 个
查看数据手册 →ATMEGA88PA-MU
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.26 / 个
查看数据手册 →ATMEGA48PA-MU
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.08 / 个
查看数据手册 →ATMEGA168P-20MU 最大额定值与电气特性
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 20 MHz |
| Program Memory Size | 16 KB (8K x 16) FLASH |
| EEPROM Size | 512 B |
| RAM Size | 1 KB SRAM |
| Number of I/O | 23 |
| Connectivity | I2C, SPI, USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| ADC Resolution | 10-bit |
| Number of ADC Channels | 8 (in QFN/TQFP packages) |
| Operating Voltage Range | 1.8 V to 5.5 V |
| Oscillator Type | Internal |
| 工作温度 | -40C to +85C |
| 封装 | 32-VQFN (5x5 mm) |
| 安装类型 | Surface Mount |
| Programming | ICSP, debugWIRE |
| Technology | picoPower low-power |
| RoHS 状态 | Compliant |
ATMEGA168P-20MU 引脚配置
| 引脚 1 | PD3 — Port D bit 3 (GPIO / OC2B PWM) |
| 引脚 2 | PD4 — Port D bit 4 (GPIO / XCK / T0) |
| 引脚 3 | GND — Ground |
| 引脚 4 | VCC — Digital supply voltage |
| 引脚 5 | GND — Ground |
| 引脚 6 | VCC — Digital supply voltage |
| 引脚 7 | PB6 — Port B bit 6 (XTAL1 / TOSC1) |
| 引脚 8 | PB7 — Port B bit 7 (XTAL2 / TOSC2) |
| 引脚 9 | PD5 — Port D bit 5 (GPIO / T1 / OC0B) |
| 引脚 10 | PD6 — Port D bit 6 (GPIO / AIN0 / OC0A) |
| 引脚 11 | PD7 — Port D bit 7 (GPIO / AIN1) |
| 引脚 12 | PB0 — Port B bit 0 (GPIO / ICP1 / CLKO) |
| 引脚 13 | PB1 — Port B bit 1 (GPIO / OC1A) |
| 引脚 14 | PB2 — Port B bit 2 (GPIO / SS / OC1B) |
| 引脚 15 | PB3 — Port B bit 3 (GPIO / MOSI / OC2A) |
| 引脚 16 | PB4 — Port B bit 4 (GPIO / MISO) |
| 引脚 17 | PB5 — Port B bit 5 (GPIO / SCK) |
| 引脚 18 | AVCC — ADC supply voltage |
| 引脚 19 | ADC6 — ADC input channel 6 |
| 引脚 20 | AREF — Analog reference voltage |
| 引脚 21 | GND — Ground |
| 引脚 22 | ADC7 — ADC input channel 7 |
| 引脚 23 | PC0 — Port C bit 0 (ADC0 / SCL) |
| 引脚 24 | PC1 — Port C bit 1 (ADC1 / SDA) |
| 引脚 25 | PC2 — Port C bit 2 (ADC2 / TCK) |
| 引脚 26 | PC3 — Port C bit 3 (ADC3 / TMS) |
| 引脚 27 | PC4 — Port C bit 4 (ADC4 / SDA / TDO) |
| 引脚 28 | PC5 — Port C bit 5 (ADC5 / SCL / TDI) |
| 引脚 29 | RESET — Reset input / debugWIRE |
| 引脚 30 | PD0 — Port D bit 0 (GPIO / RXD) |
| 引脚 31 | PD1 — Port D bit 1 (GPIO / TXD) |
| 引脚 32 | PD2 — Port D bit 2 (GPIO / INT0) |
典型应用
ATMEGA168P-20MU 适用于 6 应用s: Industrial Sensor Nodes, Arduino-Compatible Maker Platforms, Consumer Appliance Control, Battery-Powered Portable Instruments, HVAC and Building Automation, Hobby RC and Robotics Control.
Industrial Sensor Nodes
The ATMEGA168P-20MU suits industrial sensor nodes because its picoPower sleep modes and 1.8-5.5 V supply range allow direct connection to 24 V-derived or battery rails with simple regulation. The 10-bit, 8-channel ADC digitizes analog sensors such as pressure, temperature, and current-sense outputs without an external converter, while SPI and I2C interfaces handle digital sensors and RS-485 front ends via USART. In typical use the MCU wakes on watchdog or pin-change interrupt, samples sensors, and transmits over USART before returning to power-down, keeping average current in the microamp range. The 20 MHz throughput (20 MIPS) leaves headroom for filtering and protocol stacks in harsh, timing-critical environments.
推荐
Arduino-Compatible Maker Platforms
The ATmega168P is the classic MCU of Arduino-class boards (predecessor to the ATmega328P), and the -20MU VQFN version fits compact shields and custom boards. Its 16 KB flash stores the Arduino bootloader plus application sketch, while the USART-based bootloader enables firmware updates over any USB-serial bridge. DebugWIRE allows single-wire on-chip debugging from the MPLAB ecosystem, and ICSP via SPI supports factory programming. The 23 I/O lines match the standard Arduino pin mapping, so existing sketches, libraries, and shields port directly. Because the ATMEGA328P-MU shares the identical 32-VQFN footprint, a board can ship with either memory density, simplifying BOM management across cost-optimized and feature-expanded product variants.
推荐
Consumer Appliance Control
Home appliances - coffee machines, fans, small pumps, and thermostat panels - benefit from the ATMEGA168P-20MU's combination of PWM timers and robust operating range. Three flexible timer/counters generate PWM for motor speed and heater or LED dimming control, while the internal oscillator removes the need for a crystal in cost-driven designs. The 1.8-5.5 V supply tolerates unregulated transformer-rectifier rails common in appliances, and brown-out reset plus watchdog timer ensure safe recovery from mains disturbances. The 32-VQFN 5x5 mm package keeps PCB area minimal inside control panels. With 16 KB flash there is ample room for button debouncing, display driving, and communication logic in a single chip.
推荐
Battery-Powered Portable Instruments
Portable meters and data loggers leverage the ATMEGA168P-20MU's picoPower design: in power-down sleep the MCU consumes microamp-level current, and the 1.8 V floor allows two-cell alkaline operation down to end-of-discharge. The 10-bit ADC with internal reference measures battery voltage and sensor inputs, while EEPROM stores calibration constants across power cycles without external NVM. Timer-based wakeups via power-save mode enable periodic logging at precisely controlled intervals. The 5x5 mm VQFN conserves board area in handheld enclosures. Designers should budget active-mode current at 20 MHz and exploit clock prescaling - running at 1 MHz from the internal RC drastically reduces active energy per sample in duty-cycled instruments.
推荐
HVAC and Building Automation
Thermostats, damper actuators, and zone controllers use the ATMEGA168P-20MU for its I2C (TWI) bus, which connects humidity and temperature sensors, real-time clocks, and LCD drivers on two wires. The USART interfaces to RS-485 transceivers for Modbus RTU networks in commercial buildings, and 16 KB flash accommodates a compact protocol stack plus control firmware. Operating to +85C ambient covers plenum and equipment-room environments, while the watchdog timer guards against field lock-ups across long unattended deployments. PWM outputs drive triac or relay-based actuator control with soft-start profiles. The brown-out detector ensures EEPROM-backed setpoints are never corrupted during brownout events on shared building power.
推荐
Hobby RC and Robotics Control
The ATMEGA168P-20MU is a mainstay of hobby robotics: its hardware PWM channels generate servo pulse trains and motor-drive signals with jitter-free timing, while timer input-capture measures RC receiver pulses precisely. At 20 MHz the AVR delivers 20 MIPS, sufficient for closed-loop PID control on small differential-drive robots when combined with quadrature encoder reading via pin-change interrupts. SPI connects IMU breakout boards, and I2C addresses OLED displays and rangefinders. The internal 8 MHz RC oscillator option removes BOM cost in toys and entry kits. Because the ATmega328P shares the same 32-VQFN pinout, robot controller boards can offer a memory-upgrade path without redesign.
推荐
推荐产品汇总
工程参考数据： ATMEGA168P-20MU ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ATMEGA168PA-MU | ATMEGA168-20MU | ATMEGA168A-MU | ATMEGA328P-MU |
|---|---|---|---|---|---|
| Package | 32-VQFN (5x5 mm) | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB | 16 KB | 16 KB | 16 KB | 32 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 2 KB |
| Max Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Power Technology | picoPower (P die) | picoPower (PA, improved) | standard die | A die | picoPower (P die) |
| Lifecycle Recommendation | Active; PA is newer device | Recommended for new designs | Legacy equivalent | Active | Active, mainstream |
关键差异点
- picoPower P die with microamp power-down （对比 ATMEGA168-20MU)
- Dedicated ADC6/ADC7 extra channels in QFN （对比 ATMEGA168P-20AU)
- Direct memory-upgrade path （对比 ATMEGA328P-MU)
设计说明
The 32-VQFN 5x5 mm package has a central exposed die pad that must be soldered to a grounded PCB pad. Include an array of thermal vias (typically 3x3, 0.3 mm drill) under the pad connected to the ground plane to guarantee reliable solder joint formation and heat dissipation. Insufficient die-pad soldering is the most common cause of intermittent ground faults and field failures on QFN-packaged AVRs. Verify the reflow profile with X-ray or SAM sampling on first articles, and design the land pattern per Microchip QFN application guidance.
Decouple both VCC pins (4 and 6) and AVCC (pin 18) with 100 nF ceramic capacitors placed within 2 mm of each pin, plus a bulk 4.7-10 uF capacitor near the device. Tie AVCC to VCC through an LC or RC filter when ADC accuracy matters - AVCC noise directly degrades 10-bit ADC effective resolution. If ADC channels 6 and 7 (pins 19 and 22, present only in QFN/TQFP packages) are used, keep their traces short and away from switching nodes. Power the RESET line through a 10 k-ohm pull-up; debugWIRE shares this line, so avoid heavy capacitive loading.
Two frequent mistakes with the ATMEGA168P: (1) disabling RESET (RSTDISBL fuse) removes debugWIRE and ICSP access, potentially bricking boards that then need HV programming - avoid in production unless absolutely required; (2) at 5 V the 20 MHz rating applies, but at reduced voltage below 2.7 V the safe maximum frequency derates (about 10 MHz at 1.8-2.7 V class per ATmega frequency-vs-voltage curves) - always check the datasheet derating graph before running full speed at low VCC. Also remember the clock-source fuses default to the internal 8 MHz RC divided to 1 MHz on blank devices.
合规信息
RoHS compliant and lead-free per DigiKey/Mouser listings. REACH, halogen-free, and conflict-minerals status to be confirmed on the Microchip compliance portal for the specific date code.
