ATMEGA168A-AUR - 8-bit AVR MCU 16KB 20MHz | Microchip
Référence : ATMEGA168A-AUR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $2.32 | $2,32 |
| 10 | $2.09 | $20,90 |
| 100 | $1.86 | $186,00 |
| 500 | $1.63 | $815,00 |
| 1 000 | $1.45 | $1 450,00 |
ATMEGA168A-AUR Présentation
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.
Alternatives de remplacement direct pour ATMEGA168A-AUR — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ATMEGA168A-AUR (même facteur de forme et même empreinte) — différant par Communication Interfaces, Timers/Counters, Package, Supply Voltage Range, ADC Resolution.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA168PA-AUR
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$1.85 / unité
Voir la fiche technique →ATMEGA328P-AUR
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$2.18 / unité
Voir la fiche technique →ATMEGA328-AUR
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$1.65 / unité
Voir la fiche technique →ATMEGA88A-AUR
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ATMEGA48A-AUR
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ATMEGA168-20AUR
✅ Remplacement direct✓ En stock
$2.76 / unité
Voir la fiche technique →ATMEGA168A-AUR Valeurs maximales et caractéristiques électriques
| 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 |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Number of I/O | 23 |
| Connectivity | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Timers | Three flexible timer/counters with compare modes |
| Data Converters | 10-bit ADC |
| Instructions | 133 powerful instructions, most single-cycle |
| Boîtier | 32-TQFP (7x7 mm) |
| Type de montage | Surface Mount |
| Programming | In-System Programmable (ISP) FLASH with read-while-write |
| Lifecycle Stage | Active |
Configuration des broches de ATMEGA168A-AUR
| Broche 1 | PD3 — Port D, bit 3 (GPIO / interrupt source) |
| Broche 2 | PD4 — Port D, bit 4 (GPIO) |
| Broche 3 | GND — Ground |
| Broche 4 | VCC — Digital supply voltage (2.7V to 5.5V) |
| Broche 5 | GND — Ground |
| Broche 6 | VCC — Digital supply voltage |
| Broche 7 | PB6 — Port B, bit 6 (XTAL1 / TOSC1) |
| Broche 8 | PB7 — Port B, bit 7 (XTAL2 / TOSC2) |
| Broche 9 | PD5 — Port D, bit 5 (GPIO) |
| Broche 10 | PD6 — Port D, bit 6 (GPIO) |
| Broche 11 | PD7 — Port D, bit 7 (GPIO) |
| Broche 12 | PB0 — Port B, bit 0 (GPIO) |
| Broche 13 | PB1 — Port B, bit 1 (GPIO) |
| Broche 14 | PB2 — Port B, bit 2 (GPIO) |
| Broche 15 | PB3 — Port B, bit 3 (MOSI / SPI master output) |
| Broche 16 | PB4 — Port B, bit 4 (MISO / SPI master input) |
| Broche 17 | PB5 — Port B, bit 5 (SCK / SPI clock) |
| Broche 18 | AVCC — ADC supply voltage |
| Broche 19 | ADC6 — ADC input channel 6 |
| Broche 20 | AREF — Analog reference voltage for ADC |
| Broche 21 | GND — Ground |
| Broche 22 | ADC7 — ADC input channel 7 |
| Broche 23 | PC0 — Port C, bit 0 (ADC0) |
| Broche 24 | PC1 — Port C, bit 1 (ADC1) |
| Broche 25 | PC2 — Port C, bit 2 (ADC2) |
| Broche 26 | PC3 — Port C, bit 3 (ADC3) |
| Broche 27 | PC4 — Port C, bit 4 (ADC4 / SDA, TWI data) |
| Broche 28 | PC5 — Port C, bit 5 (ADC5 / SCL, TWI clock) |
| Broche 29 | PC6 — RESET (active-low reset input) |
| Broche 30 | PD0 — Port D, bit 0 (RXD, USART receive) |
| Broche 31 | PD1 — Port D, bit 1 (TXD, USART transmit) |
| Broche 32 | PD2 — Port D, bit 2 (GPIO / interrupt source) |
Applications typiques
ATMEGA168A-AUR convient pour 6 applications: Industrial Control and Automation, HVAC and Building Automation, Sensor Nodes and Battery Instruments, Consumer Appliances and White Goods, Arduino-Compatible and Educational Boards, Motor Control and PWM Actuation.
Industrial Control and Automation
The ATMEGA168A-AUR fits industrial control nodes where deterministic 8-bit control loops, USART communication, and robust power supervision matter more than raw processing horsepower. Its 133 single-cycle AVR instructions deliver up to 20 MIPS at 20 MHz - sufficient for PID control of motor drives, relay sequencing, and PLC-style I/O scanning. The brown-out detector and power-on reset guarantee clean restarts on noisy factory power rails, while the internal watchdog timer recovers from firmware lockups without external components. The byte-oriented TWI interface chains multiple sensor modules on one two-wire bus, and the SPI port drives displays or ADC front-ends. Operating across 2.7V to 5.5V, it tolerates unregulated 5V industrial supplies directly.
Recommandé
HVAC and Building Automation
In HVAC controllers, thermostat panels, and room-sensor nodes, the ATMEGA168A-AUR combines a 10-bit ADC for temperature, humidity, and pressure front-ends with the enhanced power-save mode for low average consumption. The three timer/counters with compare modes generate PWM for damper servo and fan-speed control without CPU overhead. The USART links the node to RS-485 gateways, while TWI (I2C) reads digital temperature sensors directly. The 2.7V to 5.5V supply range supports both battery-backup and 5V mains-derived rails. With 16 KB FLASH and read-while-write capability, calibration tables stored in the 512 B EEPROM can be updated in the field via ISP without interrupting program execution.
Recommandé
Sensor Nodes and Battery Instruments
Portable and battery-powered instruments benefit from the ATMEGA168A-AUR power-save mode, which idles the core while timers keep running for periodic wake-up and ADC sampling. The 10-bit ADC plus the two extra channels ADC6 and ADC7 available in the 32-TQFP package allow multi-channel sensor acquisition without an external multiplexer. The internal 1 KB SRAM handles buffering and filtering of sample streams, and the USART streams results to a host or logger. Because the core executes most instructions in a single clock cycle, the CPU can sleep between conversions even at modest clock rates, extending battery life. The 2.7V floor allows operation from two alkaline cells with a simple LDO.
Recommandé
Consumer Appliances and White Goods
Appliance control boards - coffee machines, fans, small pumps, and lighting products - use the ATMEGA168A-AUR for its low BOM cost, single-chip integration of POR, brown-out detect, watchdog, and PWM, and its wide 2.7V to 5.5V operating range suited to cost-optimized power supplies. The 16 KB FLASH accommodates UI state machines, key-scanning, and display drivers, while the three timers generate both display multiplexing and triac/PWM actuation signals. In-system programmability allows one firmware image to be flashed at end-of-line test on the assembled board, simplifying manufacturing. The active lifecycle status and multi-distributor availability protect long product runs against component obsolescence.
Recommandé
Arduino-Compatible and Educational Boards
The ATmega168 is a founding member of the pin-compatible ATmega 8/88/168/328 family that underpins Arduino-compatible boards and the MiniCore hardware package, giving the ATMEGA168A-AUR immediate access to a mature open-source toolchain, bootloaders, and library ecosystem. The 16 KB FLASH holds the Arduino bootloader plus user sketches, the USART implements USB-serial sketch upload, and SPI/TWI drive shields and sensor modules. Designers migrating between ATmega88, 168, and 328 reuse the same PCB footprint and programmer hardware, since the 32-TQFP pinout is identical across the family. This makes the part ideal for STEM kits, hobby boards, and rapid prototypes before a production spin.
Recommandé
Motor Control and PWM Actuation
Small motor drives, servo actuators, and LED dimming circuits exploit the ATMEGA168A-AUR three flexible timer/counters with compare modes to generate complementary PWM outputs with hardware dead-time behavior, offloading waveform generation from software. The AVR executes control-loop code in single clock cycles, so a 20 MHz device closes current loops at multi-kilohertz rates with margin. The 10-bit ADC reads shunt or hall feedback, the USART connects to higher-level controllers, and the watchdog enforces failsafe shutdown if firmware stalls. With 23 I/O lines, a single 32-TQFP device handles encoder inputs, limit switches, and fault inputs alongside the PWM outputs, reducing board area and component count.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA168A-AUR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATMEGA168PA-AUR | ATMEGA328P-AUR | ATMEGA88A-AUR | ATMEGA168-20AUR |
|---|---|---|---|---|---|
| Package | 32-TQFP (7x7 mm) | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB | 16 KB | 32 KB | 8 KB | 16 KB |
| SRAM | 1 KB | 1 KB | 2 KB | 1 KB | 1 KB |
| EEPROM | 512 B | 512 B | 1 KB | 512 B | 512 B |
| Max Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Supply Voltage | 2.7 V to 5.5 V | 1.8 V to 5.5 V (picoPower) | 1.8 V to 5.5 V (picoPower) | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Power Technology | Standard ATmega168A core | picoPower (lower sleep current) | picoPower | Standard A-grade core | Predecessor (non-A) core |
| Pin Compatibility | ATmega 8/88/168/328 TQFP-32 family pinout | Pin-to-pin compatible | Pin-to-pin compatible | Pin-to-pin compatible | Pin-to-pin compatible |
Principaux différenciateurs
- Best price/performance within the pin-compatible family at 16 KB (vs ATMEGA328P-AUR)
- Balanced 16 KB / 1 KB / 512 B memory configuration (vs ATMEGA88A-AUR)
- Lower unit cost than picoPower variants when sleep current is not critical (vs ATMEGA168PA-AUR)
- Updated A-process die versus the original ATmega168 (vs ATMEGA168-20AUR)
Notes de conception
Decouple both VCC pins (pins 4 and 6) and the AVCC pin (pin 18) independently: place 100 nF ceramic capacitors within 5 mm of each supply pin plus a 10 uF bulk capacitor near the device. Tie AVCC to VCC through a low-pass filter (e.g., 10 ohm series resistor plus 100 nF) when ADC accuracy matters; AVCC must never exceed VCC by more than 0.3 V. The 2.7V minimum supply means designs running from a 3.3V rail are fully supported, but verify the speed-versus-voltage derating curve in the manufacturer datasheet before running 20 MHz near the voltage floor.
The 32-TQFP (7x7 mm) exposes no thermal pad, so thermal management is straightforward, but routing discipline matters for the crystal and analog section. Keep the XTAL1/XTAL2 traces (pins 7 and 8) short (under 10 mm) and surround them with a guard ground to prevent stray coupling that can stop the oscillator. Route ADC sensor signals away from the SPI clock (PB5) and USART TX lines, and reserve pins ADC6/ADC7 (pins 19 and 22) for the most noise-sensitive analog channels since they connect directly to the ADC mux with minimal internal routing.
PC6 (pin 29) is the dedicated RESET pin - do not configure it as a weak I/O drive without understanding that clearing the RESET-disable fuse locks out further ISP programming. When migrating firmware from ATMEGA88A or ATMEGA328P, verify EEPROM addressing and flash-size-dependent constants, and confirm fuse settings (clock source, brown-out threshold) are re-checked for the target variant. Supplying the part below 2.7 V with a 20 MHz clock is outside the verified specification for this ordering code - either lower the clock or select a picoPower variant such as ATMEGA168PA-AUR with a wider voltage range.
For ISP programming via the SPI pins (PB3/MOSI, PB4/MISO, PB5/SCK, PC6/RESET), place a series 100 ohm resistor on SCK close to the programming header to damp ringing on long cables. On the TWI bus (PC4/SDA, PC5/SCL), use 4.7 kohm pull-ups at 5V operation (10 kohm at 3.3V) and keep bus capacitance under 400 pF per the two-wire interface specification. These practice notes follow standard AVR hardware design guidance from Microchip application documentation rather than a specific datasheet figure.
Informations de conformité
The -AUR ordering suffix indicates RoHS-compliant, lead-free, tape-and-reel packaging per Microchip ordering-code convention. Formal REACH and conflict-minerals declarations should be obtained from the Microchip product page compliance portal.