ATMEGA168-20PU - 8-bit AVR MCU 16KB Flash 20MHz PDIP-28 | Microchip
N.º da peça: ATMEGA168-20PU ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $5.05 | $5,05 |
| 10 | $4.72 | $47,20 |
| 100 | $4.35 | $435,00 |
| 500 | $4.05 | $2.025,00 |
| 1.000 | $3.78 | $3.780,00 |
ATMEGA168-20PU Visão geral
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.
Alternativas drop-in para ATMEGA168-20PU — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com ATMEGA168-20PU (mesmo formato e footprint) — diferindo em Communication Interfaces, Package, ADC, RoHS Status, Working Registers.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ATMEGA168A-PU
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ATMEGA168PA-PU
✅ Drop-In✓ Em estoque
$1.86 / unidade
Ver ficha técnica →ATMEGA168P-20PU
✅ Drop-In✓ Em estoque
$2.05 / unidade
Ver ficha técnica →ATMEGA328P-PU
✅ Drop-In✓ Em estoque
Consulte o preço
Ver ficha técnica →ATMEGA328-PU
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ATMEGA88-20PU
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$0.82 / unidade
Ver ficha técnica →ATMEGA168-20PI
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ATMEGA168-20PU Classificações máximas e características elétricas
| Core Processor | AVR 8-bit RISC |
| Core Size | 8-Bit |
| Max Clock Speed | 20 MHz |
| Flash Memory | 16 KB (8K x 16) |
| EEPROM | 512 B |
| SRAM | 1 KB |
| Supply Voltage Range | 2.7 V to 5.5 V |
| General Purpose I/O | 23 |
| ADC Resolution | 10-bit |
| ADC Channels (PDIP) | 6 |
| Communication Interfaces | USART, SPI, I2C (TWI) |
| Timers | 2 x 8-bit, 1 x 16-bit |
| Encapsulamento | 28-PDIP (0.300 inch, 7.62 mm) |
| Tipo de montagem | Through Hole |
| Instruction Set | 133 instructions, most single-cycle |
| Working Registers | 32 x 8-bit |
| Debug Interface | debugWIRE |
Configuração de pinos do ATMEGA168-20PU
| Pino 1 | PC6 / RESET — Reset input (active low) or digital I/O PC6 |
| Pino 2 | PD0 / RXD — Digital I/O PD0, USART receive |
| Pino 3 | PD1 / TXD — Digital I/O PD1, USART transmit |
| Pino 4 | PD2 / INT0 — Digital I/O PD2, external interrupt 0 |
| Pino 5 | PD3 / INT1 / OC2B — Digital I/O PD3, external interrupt 1, Timer2 PWM output |
| Pino 6 | PD4 / T0 / XCK — Digital I/O PD4, Timer0 counter input, USART external clock |
| Pino 7 | VCC — Digital supply voltage (2.7 V to 5.5 V) |
| Pino 8 | GND — Ground |
| Pino 9 | PB6 / XTAL1 / TOSC1 — Digital I/O PB6, crystal oscillator input, RTC oscillator input |
| Pino 10 | PB7 / XTAL2 / TOSC2 — Digital I/O PB7, crystal oscillator output |
| Pino 11 | PD5 / T1 / OC0B — Digital I/O PD5, Timer1 counter input, Timer0 PWM output |
| Pino 12 | PD6 / AIN0 / OC0A — Digital I/O PD6, analog comparator positive input, Timer0 PWM output |
| Pino 13 | PD7 / AIN1 — Digital I/O PD7, analog comparator negative input |
| Pino 14 | PB0 / ICP1 / CLK0 — Digital I/O PB0, Timer1 input capture, divided clock output |
| Pino 15 | PB1 / OC1A — Digital I/O PB1, Timer1 PWM output A |
| Pino 16 | PB2 / SS / OC1B — Digital I/O PB2, SPI slave select, Timer1 PWM output B |
| Pino 17 | PB3 / MOSI / OC2A — Digital I/O PB3, SPI master data out, Timer2 PWM output |
| Pino 18 | PB4 / MISO — Digital I/O PB4, SPI master data in |
| Pino 19 | PB5 / SCK — Digital I/O PB5, SPI serial clock |
| Pino 20 | AVCC — ADC supply voltage, connect to VCC via low-pass filter |
| Pino 21 | AREF — ADC analog reference voltage |
| Pino 22 | GND — Ground |
| Pino 23 | PC0 / ADC0 — Digital I/O PC0, ADC channel 0 |
| Pino 24 | PC1 / ADC1 — Digital I/O PC1, ADC channel 1 |
| Pino 25 | PC2 / ADC2 — Digital I/O PC2, ADC channel 2 |
| Pino 26 | PC3 / ADC3 — Digital I/O PC3, ADC channel 3 |
| Pino 27 | PC4 / ADC4 / SDA — Digital I/O PC4, ADC channel 4, TWI data line |
| Pino 28 | PC5 / ADC5 / SCL — Digital I/O PC5, ADC channel 5, TWI clock line |
Aplicações típicas
ATMEGA168-20PU é adequado para 6 aplicaçãos: Arduino-Compatible Prototyping Boards, Industrial Sensor Nodes and Data Loggers, Home Automation and Smart Devices, Battery-Powered Portable Instruments, Motor Control and PWM Actuation, Educational and Legacy Through-Hole Systems.
Arduino-Compatible Prototyping Boards
The ATMEGA168-20PU is a natural fit for Arduino-compatible boards and through-hole prototypes because the PDIP-28 package plugs into a standard 0.1-inch socket, allowing the MCU to be swapped without desoldering. The Arduino ecosystem (including the MiniCore hardware package on GitHub) provides bootloaders and board definitions for ATmega168/328 parts. With a 16 MHz crystal at 5V, the device delivers 16 MIPS with single-cycle I/O access, comfortably running digitalRead/Write, PWM, and ADC sampling loops. ISP flashing through the SPI header keeps firmware updates non-destructive to the board.
Recomendado
Industrial Sensor Nodes and Data Loggers
In industrial sensing, the ATMEGA168-20PU combines a 10-bit ADC with six analog channels on the PDIP variant, USART for RS-485/Modbus links via a transceiver, and the TWI (I2C) master for digital sensors. The 2.7V-5.5V supply range tolerates unregulated industrial rails after simple LDO conditioning, and the Power-down sleep mode (sub-uA class) suits battery-backed loggers that wake on timer or interrupt. The 16KB Flash accommodates a Modus-free acquisition firmware plus a small protocol stack, while 512B EEPROM safely stores calibration constants across power cycles.
Recomendado
Home Automation and Smart Devices
For smart-home nodes such as wall switches, dimmers, and RF remotes, the ATMEGA168-20PU offers TWI for OLED displays and RTC chips, SPI for RF transceiver modules, and hardware PWM on multiple timer channels for LED dimming or small motor control. Running at 20 MHz from a 5V rail gives ample timing resolution for zero-cross AC dimming, and the analog comparator supports mains-sync detection without external op-amps. The through-hole package simplifies repair-friendly consumer designs and low-volume assembly by hand or wave soldering.
Recomendado
Battery-Powered Portable Instruments
Portable meters and handheld instruments benefit from the AVR family's low-power design: multiple sleep modes, an on-chip ADC with internal 1.1V/2.56V references, and clock prescaling that lets the 20 MHz core idle at kilohertz rates to save power. The 2.7V floor permits two-cell alkaline or single-cell lithium operation with a boost regulator. Firmware can gate peripherals per the datasheet's Power Reduction Register, and debugWIRE on the RESET pin enables single-wire in-system debugging with only one signal pin consumed during development.
Recomendado
Motor Control and PWM Actuation
The ATMEGA168-20PU drives small DC motors, servos, and stepper drivers using its three timers: two 8-bit timers provide up to four PWM channels for fan/servo control, and the 16-bit Timer1 generates precise servo or phase-correct PWM at 20 MHz resolution. Hardware input-capture supports tachometer/encoder feedback without CPU polling. Fast GPIO with single-cycle access allows bit-banged protocols for ESC or driver interfaces. Combined with a MOSFET gate driver, the MCU's 20 MIPS throughput handles closed-loop speed control loops at multi-kilohertz update rates.
Recomendado
Educational and Legacy Through-Hole Systems
Universities and repair shops value the ATMEGA168-20PU because the DIP-28 body teaches real pin-level wiring - crystals, ISP headers, decoupling - with no hot-air rework required, and it retrofits into decades of legacy DIP-based control boards as a direct replacement for older AT90S/ATmega8-class sockets (with firmware porting). The AVR instruction set, with 133 mostly single-cycle instructions and 32 working registers, remains a standard teaching platform, and open toolchains (avrdude, GCC, MiniCore) run free on any PC.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ATMEGA168-20PU — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ATMEGA168A-PU | ATMEGA168PA-PU | ATMEGA168P-20PU | ATMEGA328P-PU | ATMEGA88-20PU |
|---|---|---|---|---|---|---|
| Package | 28-PDIP | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same |
| Brand | Microchip Technology (Atmel legacy) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB | 16 KB | 16 KB | 16 KB | 32 KB | 8 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 2 KB | 1 KB |
| EEPROM | 512 B | 512 B | 512 B | 512 B | 1 KB | 512 B |
| Max Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Power Technology | Standard CMOS | Refreshed low-power | picoPower | picoPower | picoPower | Standard CMOS |
| GPIO Count | 23 | 23 | 23 | 23 | 23 | 23 |
| Drop-in Compatibility | Reference part | Pin-to-pin, same register map | Pin-to-pin, same register map | Pin-to-pin, same register map | Pin-to-pin upgrade, 2x memory | Pin-to-pin downgrade, half Flash |
Principais diferenciais
- Through-hole PDIP-28 package for socketed, repairable designs (vs ATMEGA168-20AU / ATMEGA328P-PU TQFP peers)
- 20 MHz top speed grade within the ATmega168 PDIP family (vs ATMEGA168V-10PU / ATMEGA168PV-10PU)
- Straightforward memory upgrade path (vs ATMEGA328P-PU)
Notas de projeto
The 20 MHz '-20' speed grade is guaranteed only in the 4.5V-5.5V supply region; below that, derate the clock per the datasheet maximum-frequency-vs-VCC safe operating region (roughly halving near 2.7V). Provide separate VCC and AVCC filtering: connect AVCC to VCC through an LC or RC low-pass (e.g., 10 uH / 10 uF) so ADC readings are not corrupted by digital supply noise, and never leave AVCC floating even if the ADC is unused.
Place 100 nF ceramic decoupling capacitors directly across VCC-GND (pins 7-8) and AVCC-GND (pin 20 to nearest ground), with leads as short as possible on through-hole layouts. Add a bulk 10 uF capacitor at the power entry point. Route the ISP header (MOSI/MISO/SCK/RESET/VCC/GND) as a 2x3 0.1-inch header near the MCU so AVRISP/MPLAB SNAP programmers reach it without disturbing crystal routing.
PC6 (pin 1) defaults to RESET, not GPIO - reconfiguring it as I/O disables external reset and complicates ISP recovery, so keep it as RESET in most designs. When using an external crystal on PB6/PB7, set the correct CKSEL/SUT fuse bits; wrong fuses can brick the clock configuration, requiring a high-frequency external clock for rescue. Also note RESET doubles as the debugWIRE single-wire debug pin.
For I2C (TWI on PC4/SDA, PC5/SCL), include pull-up resistors sized for bus capacitance - typically 4.7 kOhm at 100 kHz for short buses on a 5V rail. For USART links beyond board level, use a proper transceiver (RS-485/RS-232) rather than driving lines directly. Crystal layout should keep the crystal and two load capacitors within a few millimeters of PB6/PB7 over a solid ground pour.
Informações de conformidade
Compliance status not stated in provided web data; the FindMyChip listing references 'GREEN' packaging for the related ATMEGA168P-20PU, but this product's RoHS/REACH status must be confirmed on the Microchip product page.
