ATMEGA168PA-PU - 8-bit AVR MCU, 16KB Flash, 20MHz | Microchip
Référence : ATMEGA168PA-PU ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $2.79 | $2,79 |
| 10 | $2.51 | $25,10 |
| 100 | $2.24 | $224,00 |
| 500 | $2.02 | $1 010,00 |
| 1 000 | $1.86 | $1 860,00 |
ATMEGA168PA-PU Présentation
An 8-bit microcontroller (MCU) is a self-contained computing device that integrates a processor core, program memory, data memory, and peripherals on a single silicon die. Within the power management hierarchy of embedded systems, an MCU such as the AVR ATmega family sits at the control layer, executing firmware that coordinates sensors, actuators, and communication interfaces. The AVR architecture uses a modified Harvard layout with 32 general-purpose working registers directly connected to the ALU, allowing most of its 133 instructions to execute in a single clock cycle.
Key features of the ATMEGA168PA-PU include read-while-write ISP Flash programming, 23 general-purpose I/O lines, a 10-bit ADC, a programmable USART, a byte-oriented Two-Wire (I2C) interface, and an SPI serial port. The picoPower technology delivers multiple sleep modes for battery-operated designs, and the -PU suffix denotes the commercial/industrial PDIP (28-DIP, 0.300 inch / 7.62 mm pitch) package supplied in tubes.
Technically, the device operates from a 2.7 V to 5.5 V supply, supports in-system programming via the SPI or bootloader, and includes brown-out detection, a power-on reset, and a watchdog timer for robust operation. Three flexible timer/counters with compare modes and PWM outputs allow motor control, LED dimming, and precise waveform generation without CPU overhead.
Typical applications include Arduino-compatible prototyping boards, hobby and educational electronics, low-power sensor nodes, and small industrial control and instrumentation products where through-hole mounting eases assembly and rework.
For design, note that the 16 KB Flash and 1 KB SRAM ceiling makes the pin-compatible ATMEGA328P-PU (32 KB Flash, 2 KB SRAM) the safer choice if firmware growth is expected; otherwise the ATMEGA168PA-PU offers the lowest cost in the 28-pin family.
This page synthesizes verified distributor data, pin-compatible drop-in alternatives, comparison tables, and practical design notes not found in a single manufacturer datasheet.
Alternatives de remplacement direct pour ATMEGA168PA-PU — 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 ATMEGA168PA-PU (même facteur de forme et même empreinte) — différant par Communication Interfaces, Timers, RoHS Status, Operating Temperature, ADC.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA168A-PU
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATMEGA328P-PU
✅ Remplacement direct✓ En stock
Contactez-nous pour le prix
Voir la fiche technique →ATMEGA168-20PU
✅ Remplacement direct✓ En stock
$3.78 / unité
Voir la fiche technique →ATMEGA168P-20PU
✅ Remplacement direct✓ En stock
$2.05 / unité
Voir la fiche technique →ATMEGA168V-10PU
✅ Remplacement direct✓ En stock
$2.01 / unité
Voir la fiche technique →ATMEGA88PA-PU
✅ Remplacement direct✓ En stock
$1.85 / unité
Voir la fiche technique →ATMEGA168PA-PU Valeurs maximales et caractéristiques électriques
| Core Architecture | 8-bit AVR RISC |
| Flash Program Memory | 16 KB (8K x 16) |
| SRAM | 1 KB |
| EEPROM | 512 B |
| Fréquence d'horloge maximale | 20 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V |
| General Purpose I/O Lines | 23 |
| Working Registers | 32 |
| Instructions | 133, most single-cycle |
| Timers/Counters | 3 (with compare and PWM modes) |
| ADC | 10-bit, 6 channels |
| Communication Interfaces | USART, SPI, Two-Wire (I2C) |
| Boîtier | 28-PDIP (0.300 in, 7.62 mm), through-hole |
| Type de montage | Through Hole |
| Packaging | Tube |
| Special Features | picoPower, brown-out detect, POR, watchdog, ISP, read-while-write |
| Life Cycle Stage | Active |
Configuration des broches de ATMEGA168PA-PU
| Broche 1 | PC6 / RESET — Reset input (active low) or port C bit 6 |
| Broche 2 | PD0 / RXD — Port D bit 0 / USART receive |
| Broche 3 | PD1 / TXD — Port D bit 1 / USART transmit |
| Broche 4 | PD2 / INT0 — Port D bit 2 / external interrupt 0 |
| Broche 5 | PD3 / INT1 — Port D bit 3 / external interrupt 1 / OC2B |
| Broche 6 | PD4 — Port D bit 4 / timer counter input T0/XCK |
| Broche 7 | VCC — Digital supply voltage (2.7 V to 5.5 V) |
| Broche 8 | GND — Ground |
| Broche 9 | PB6 / XTAL1 — Port B bit 6 / crystal oscillator input or external clock |
| Broche 10 | PB7 / XTAL2 — Port B bit 7 / crystal oscillator output |
| Broche 11 | PD5 / OC0B — Port D bit 5 / timer0 compare output B / T1 |
| Broche 12 | PD6 / OC0A — Port D bit 6 / timer0 compare output A / AIN0 |
| Broche 13 | PD7 / AIN1 — Port D bit 7 / analog comparator negative input |
| Broche 14 | PB0 / ICP1 — Port B bit 0 / timer1 input capture / CLKO |
| Broche 15 | PB1 / OC1A — Port B bit 1 / timer1 compare output A |
| Broche 16 | PB2 / OC1B / SS — Port B bit 2 / timer1 compare output B / SPI slave select |
| Broche 17 | PB3 / MOSI / OC2A — Port B bit 3 / SPI master output / timer2 compare output A |
| Broche 18 | PB4 / MISO — Port B bit 4 / SPI master input |
| Broche 19 | PB5 / SCK — Port B bit 5 / SPI clock |
| Broche 20 | AVCC — ADC supply voltage, connect to VCC |
| Broche 21 | AREF — Analog reference voltage for ADC |
| Broche 22 | GND — Ground |
| Broche 23 | PC0 / ADC0 — Port C bit 0 / ADC channel 0 |
| Broche 24 | PC1 / ADC1 — Port C bit 1 / ADC channel 1 |
| Broche 25 | PC2 / ADC2 — Port C bit 2 / ADC channel 2 |
| Broche 26 | PC3 / ADC3 — Port C bit 3 / ADC channel 3 |
| Broche 27 | PC4 / ADC4 / SDA — Port C bit 4 / ADC channel 4 / Two-Wire data |
| Broche 28 | PC5 / ADC5 / SCL — Port C bit 5 / ADC channel 5 / Two-Wire clock |
Applications typiques
ATMEGA168PA-PU convient pour 6 applications: Arduino-Compatible Prototyping Boards, Low-Power Battery Sensor Nodes, Industrial Control and Monitoring, Education and STEM Training Kits, Consumer Appliance Subsystems, Hobby Robotics and RC Projects.
Arduino-Compatible Prototyping Boards
The ATMEGA168PA-PU is the classic through-hole MCU used in early Arduino-compatible boards, because the 28-pin PDIP is socketed and can be swapped in seconds. Its 16 KB Flash runs standard Arduino bootloaders, and its 20 MHz rating (typically clocked at 16 MHz from a ceramic resonator) matches the Arduino ecosystem timing assumptions. The 23 GPIO lines and 10-bit ADC support shields and analog sensors directly. Developers prototype on a socketed DIP, burn the bootloader via ISP, and move to the ATMEGA328P-PU on the same footprint when 16 KB or 1 KB SRAM becomes the limit.
Recommandé
Low-Power Battery Sensor Nodes
The picoPower technology of the ATMEGA168PA-PU makes it well suited to battery-powered sensor nodes: six sleep modes (idle through power-down) let the design idle at micropower levels and wake on pin-change interrupt, watchdog, or timer event. The 2.7 V floor allows operation directly from two alkaline cells or a single lithium coin cell via a small LDO, while the integrated 10-bit ADC reads temperature, humidity, or light sensors without external converters. A typical node sleeps most of the time, wakes every few seconds, samples a channel, and transmits over USART or SPI - the 16 KB Flash easily holds such firmware.
Recommandé
Industrial Control and Monitoring
In small industrial controllers, the ATMEGA168PA-PU provides brown-out detection, a power-on reset, and a watchdog timer - the three safety nets required for unattended equipment. Three timer/counters with compare modes generate PWM for motor drives, heater control, or valve positioning, while the USART links to Modbus-style RS-485 transceivers and the Two-Wire interface reads digital sensors. The 5 V rating gives robust noise margins typical of industrial panels, and the through-hole PDIP survives vibration better when socketed with retention clips. Code size for simple sequencer or monitoring tasks stays comfortably within 16 KB Flash and 1 KB SRAM.
Recommandé
Education and STEM Training Kits
Because the ATMEGA168PA-PU is through-hole and widely documented, it remains a staple of electronics education: students can insert it into a breadboard, wire a 5 V supply and 16 MHz crystal, and flash code with an inexpensive USBasp programmer. The 133-instruction AVR RISC core teaches assembly fundamentals, while the 10-bit ADC, PWM outputs, and USART/SPI/I2C peripherals support progressively advanced labs in sensing, actuation, and serial communication. The 16 KB Flash is ample for classroom exercises, and replacing a damaged chip costs a few dollars - a practical advantage over fragile surface-mount alternatives in teaching environments.
Recommandé
Consumer Appliance Subsystems
Consumer appliances - coffee makers, fans, small heaters, and chargers - use the ATMEGA168PA-PU for front-panel control: reading buttons via port pins, driving seven-segment or LCD displays, generating buzzer tones with timer PWM, and sequencing relays through GPIO. The 2.7 V to 5.5 V supply range fits transformer or capacitive-dropper power supplies, and the internal RC oscillator removes the crystal in cost-driven designs where timing tolerance permits. The watchdog and brown-out reset ensure the appliance recovers safely from mains brownouts, and the 16 KB Flash holds UI logic, EEPROM-backed user settings (512 B EEPROM), and communication code with ease.
Recommandé
Hobby Robotics and RC Projects
The ATMEGA168PA-PU is a favorite in hobby robotics for its three timers with PWM outputs that directly drive servo and ESC signals, six ADC channels that read IR rangefinders, line sensors, and battery voltage, and a hardware USART for Bluetooth or telemetry modules over SPI and I2C buses. The 20 MHz capability allows fast control loops for balancing robots, while the 32 working registers let interrupt service routines run with minimal context overhead. The DIP package sockets into perfboard robots, and the wide 2.7 V to 5.5 V range tolerates sagging battery packs during motor stalls.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA168PA-PU — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATMEGA168A-PU | ATMEGA328P-PU | ATMEGA168-20PU | ATMEGA168P-20PU | ATMEGA168V-10PU | ATMEGA88PA-PU |
|---|---|---|---|---|---|---|---|
| Package | 28-PDIP (through-hole) | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB | 16 KB | 32 KB | 16 KB | 16 KB | 16 KB | 8 KB |
| SRAM | 1 KB | 1 KB | 2 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| Maximum Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 10 MHz | 20 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 1.8 V to 5.5 V | 4.5 V to 5.5 V | 2.7 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| picoPower Low-Leakage Process | Yes (PA revision) | No | Yes (P revision) | No | Yes | No | Yes (PA revision) |
Principaux différenciateurs
- picoPower low-leakage process for battery designs (vs ATMEGA168A-PU)
- Lowest cost with 16 KB on the 28-pin PDIP footprint (vs ATMEGA328P-PU)
- Full 20 MHz speed rating (vs ATMEGA168V-10PU)
Notes de conception
Decouple VCC and AVCC separately with 100 nF ceramic capacitors placed as close to pins 7 and 20 as possible, plus 4.7 uF bulk capacitance on the board. AVCC must always be connected to VCC even if the ADC is unused. If ADC accuracy matters, add an RC low-pass (e.g., 10 ohm + 100 nF) between VCC and AVCC and route ADC traces away from clock lines. Estimated: at 5 V and full 20 MHz operation, active current is on the order of 10-15 mA per typical AVR datasheet curves - verify against the current datasheet figure for your voltage and frequency.
PC6 (pin 1) defaults to RESET. If you want a seventh I/O pin, disabling RESET via fuse removes high-voltage ISP reprogrammability - only do this for cost-critical finished products. Also, clock speed is voltage dependent: 16-20 MHz operation requires VCC near 5 V per AVR speed-grade curves; running 16 MHz at 3.3 V is out of specification for this device. When migrating firmware from the ATMEGA328P-PU, check that Flash usage is under 16 KB and static RAM under 1 KB, or the linker will silently overrun SRAM.
Keep the crystal (if used) within a few millimeters of pins 9 and 10 with short ground return paths, and use 12-22 pF load capacitors matched to the crystal specification. Because the PDIP is through-hole, socketed designs add contact resistance and inductance - acceptable at 20 MHz but avoid long ribbon connections to the crystal. For ISP programming, route MOSI, MISO, SCK, and RESET to a 2x3 header, and ensure other circuitry on those pins (e.g., LEDs on SCK) does not load the programming lines.
The PDIP package dissipates far less power than the MCU's rating envelope in typical use. Estimated: at 5 V with ~15 mA active current, dissipation is roughly 75 mW, well within the PDIP thermal capability with no heatsink considerations. Thermal design only becomes relevant when driving high LED or relay currents directly from GPIO - keep per-pin sink/source current within datasheet absolute maximum ratings (40 mA absolute maximum per pin, lower for reliable long-term operation) and use transistors or drivers for loads above a few tens of milliamperes.
Informations de conformité
Compliance details were not stated in the provided web data; consult the Microchip product page or environmental datasheet. Note that ATMEGA168-20PU listings describe a 'green' variant of the older family.
