ATMEGA88P-20AUR - 8-bit AVR MCU 20MHz 8KB Flash | Microchip
MPN: ATMEGA88P-20AUR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.42 | $1.42 |
| 10 | $1.28 | $12.80 |
| 100 | $1.09 | $109.00 |
| 500 | $0.95 | $475.00 |
| 1,000 | $0.82 | $820.00 |
| 3,000 | $0.74 | $2,220.00 |
ATMEGA88P-20AUR Overview
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most of its 131 instructions in a single clock cycle, positioning it in the embedded control hierarchy as an MCU -> 8-bit microcontroller -> AVR ATmega family member -> semiconductor integrated circuit. It integrates program memory, data memory, timers, ADC, and serial peripherals on one die, replacing multi-chip solutions in cost-sensitive control systems.
Key features include 20 MHz maximum clock speed (5V operation), a 10-bit 8-channel ADC, picoPower technology for ultra-low sleep-mode consumption, debugWIRE on-chip debugging over the reset line, and 2.7V to 5.5V supply operation. Three flexible timers/counters with compare modes, plus USART, SPI, and TWI (I2C) interfaces, cover most embedded communication needs.
Architecturally, the device pairs 32 general-purpose working registers directly with the ALU, avoiding the accumulator bottleneck of classic 8051-style cores. Read-while-write Flash enables self-programming bootloaders, while in-system programmable (ISP) memory supports field firmware updates without removing the chip from the PCB.
Typical applications include industrial sensor nodes and motor control, home automation and IoT end nodes, and consumer appliances requiring precise analog measurement via the 8-channel 10-bit ADC at low cost.
For design, note that maximum clock frequency derates with supply voltage: 20 MHz is only guaranteed at 4.5V-5.5V, so 3.3V systems must limit operation to roughly 13.3 MHz or accept overclocking risk.
This page synthesizes distributor pricing, drop-in alternatives within the ATmega family, pinout data, and practical design notes beyond what a single datasheet page offers.
Drop-in alternatives for ATMEGA88P-20AUR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATMEGA88P-20AUR (same form factor and footprint) β differing in Operating Temperature, Package, Supply Voltage Range, General Purpose Working Registers, ADC.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA88A-AU
β Drop-Inβ In Stock
$1.52 / Unit
View Datasheet βATMEGA88P-20AU
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA88-20AU
β Drop-Inβ In Stock
$2.33 / Unit
View Datasheet βATMEGA88-20AI
β Drop-Inβ In Stock
$1.38 / Unit
View Datasheet βATMEGA328P-AUR
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA8A-AUR
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA88P-20AUR Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Maximum Clock Frequency | 20 MHz |
| Flash Memory | 8 KB (4K x 16) |
| EEPROM | 512 B |
| SRAM | 1 KB |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Throughput | Up to 20 MIPS at 20 MHz |
| GPIO Count | 23 |
| ADC Resolution | 10-bit |
| ADC Channels | 8 |
| Communication Interfaces | USART, SPI, TWI (I2C) |
| Timers/Counters | 3 (two 8-bit, one 16-bit) |
| Debug System | debugWIRE on-chip debug |
| Instructions | 131, most single-cycle |
| Package | 32-TQFP (7x7 mm) |
| Mounting Type | Surface Mount |
| Low Power Technology | picoPower |
| Programming | ISP in-system, self-programming Flash |
| Operating Temperature | -40C to +85C (industrial) |
| RoHS Status | Compliant |
ATMEGA88P-20AUR Pin Configuration
| Pin 1 | PD3 β Port D, bit 3 (GPIO / PCINT19) |
| Pin 2 | PD4 β Port D, bit 4 (GPIO / XCK/T0 / PCINT20) |
| Pin 3 | GND β Ground |
| Pin 4 | VCC β Digital supply voltage |
| Pin 5 | GND β Ground |
| Pin 6 | VCC β Digital supply voltage |
| Pin 7 | PB6 β Port B, bit 6 (XTAL1/TOSC1 / PCINT6) |
| Pin 8 | PB7 β Port B, bit 7 (XTAL2/TOSC2 / PCINT7) |
| Pin 9 | PD5 β Port D, bit 5 (T1 / OC0B / PCINT21) |
| Pin 10 | PD6 β Port D, bit 6 (AIN0 / OC0A / PCINT22) |
| Pin 11 | PD7 β Port D, bit 7 (AIN1 / PCINT23) |
| Pin 12 | PB0 β Port B, bit 0 (ICP1 / CLKO / PCINT0) |
| Pin 13 | PB1 β Port B, bit 1 (OC1A / PCINT1) |
| Pin 14 | PB2 β Port B, bit 2 (SS/OC1B / PCINT2) |
| Pin 15 | PB3 β Port B, bit 3 (MOSI/OC2A / PCINT3) |
| Pin 16 | PB4 β Port B, bit 4 (MISO / PCINT4) |
| Pin 17 | PB5 β Port B, bit 5 (SCK / PCINT5) |
| Pin 18 | AVCC β ADC supply voltage |
| Pin 19 | ADC6 β Analog input channel 6 |
| Pin 20 | AREF β Analog reference voltage |
| Pin 21 | GND β Ground |
| Pin 22 | ADC7 β Analog input channel 7 |
| Pin 23 | PC0 β Port C, bit 0 (ADC0 / PCINT8) |
| Pin 24 | PC1 β Port C, bit 1 (ADC1 / PCINT9) |
| Pin 25 | PC2 β Port C, bit 2 (ADC2 / PCINT10) |
| Pin 26 | PC3 β Port C, bit 3 (ADC3 / PCINT11) |
| Pin 27 | PC4 β Port C, bit 4 (ADC4/SDA / PCINT12) |
| Pin 28 | PC5 β Port C, bit 5 (ADC5/SCL / PCINT13) |
| Pin 29 | PC6 β Port C, bit 6 (RESET, active low / PCINT14) |
| Pin 30 | PD0 β Port D, bit 0 (RXD / PCINT16) |
| Pin 31 | PD1 β Port D, bit 1 (TXD / PCINT17) |
| Pin 32 | PD2 β Port D, bit 2 (INT0 / PCINT18) |
Typical Applications
ATMEGA88P-20AUR is suitable for 6 applications: Industrial Sensor Nodes, Home Automation and IoT End Nodes, Motor Control and Fan Drivers, Consumer Appliance Control, Educational and Hobby Embedded Platforms, Battery-Powered Portable Instruments.
Industrial Sensor Nodes
The ATMEGA88P-20AUR fits industrial sensor acquisition nodes because its 10-bit, 8-channel ADC digitizes up to eight analog sensors (temperature, pressure, current shunts) without external conversion hardware, and its 2.7V-5.5V supply range tolerates unregulated 5V industrial rails. In a typical node, the MCU samples via ADC0-ADC5, formats data in its 1 KB SRAM, and transmits over TWI or USART to a gateway at 115200 baud. PicoPower sleep modes cut idle current to microamp levels for battery-backed nodes, while the industrial -40C to +85C temperature grade and 20 MIPS throughput handle both intermittent bursts and real-time threshold interrupts from the three on-chip timers.
Recommended
Home Automation and IoT End Nodes
For home automation endpoints such as wall switches, dimmers, and environmental monitors, the ATMEGA88P-20AUR combines low cost with the connectivity mix (USART, SPI, TWI) needed to drive sub-GHz or 2.4 GHz radio modules. Its picoPower technology is the decisive parameter: power-down sleep with a periodic timer2 wake from a 32.768 kHz crystal keeps average consumption compatible with coin-cell or energy-harvesting supplies. The 23 GPIO lines directly drive relays, LEDs, and capacitive-style button inputs, while the 10-bit ADC reads NTC thermistors for climate reporting. Firmware is field-updatable through the read-while-write self-programming Flash bootloader over the existing radio link, avoiding physical access after installation.
Recommended
Motor Control and Fan Drivers
The ATMEGA88P-20AUR performs small brushed-DC and BLDC fan control using its 16-bit Timer/Counter1 in PWM mode: at 20 MHz, it generates 8-bit PWM at roughly 78 kHz, above audible range. The ADC monitors back-EMF or hall-sensor inputs on up to 8 channels for commutation feedback, and analog-comparator-assisted zero-cross detection is available on the ADC pins. The 23 GPIOs gate a driver stage, and the watchdog timer enforces safe shutdown if firmware stalls - a common safety requirement in appliance thermal management. Its 5V industrial tolerance and -40C to +85C operation suit closed hot-air environments inside projectors, power supplies, and HVAC actuators.
Recommended
Consumer Appliance Control
In coffee makers, rice cookers, and small appliance controllers, the ATMEGA88P-20AUR replaces discrete logic by integrating touch/button scanning on GPIO, NTC temperature measurement via the 10-bit ADC, and zero-cross-synchronized heater PWM on the 16-bit timer. The 8 KB Flash comfortably holds control state machines, fault logging in the 512 B EEPROM (retaining settings across power cycles), and localized UI text. debugWIRE on the reset pin allows two-wire production-line calibration of temperature offsets without extra test pads. The 2.7V-5.5V range accepts low-cost unregulated supplies, and the picoPower standby modes meet standby-power limits in off-state appliance regulations.
Recommended
Educational and Hobby Embedded Platforms
The ATMEGA88P-20AUR is a staple of embedded-systems education because the AVR instruction set (131 instructions, mostly single-cycle) is compact enough to teach assembly, yet the peripheral set - timers, USART, SPI, TWI, and ADC - mirrors larger industrial MCUs. Its 32-TQFP footprint is hand-solderable on training boards, and the same die architecture scales directly to the ATmega328P used in Arduino Uno. Development uses free toolchains: MPLAB X with AVR-GCC, or the Arduino IDE for C++ beginners. debugWIRE debugging requires only the reset line, so students experience professional on-chip debugging on a sub-$2 IC, including breakpoint and single-step workflows.
Recommended
Battery-Powered Portable Instruments
Handheld meters and portable data loggers benefit from the ATMEGA88P-20AUR's picoPower sleep architecture: in power-down mode with watchdog active, the device wakes periodically, runs a 10-bit ADC conversion of the measured quantity, updates the LCD or stores a sample, and returns to sleep. A 3V lithium cell powers the 2.7V-5.5V input directly without a regulator. The internal 2.56V bandgap reference and internal RC oscillator eliminate external precision components for low-accuracy meters, while battery voltage is self-monitored via a spare ADC channel. The 512 B EEPROM retains calibration constants, and the 8 KB Flash stores logging tables plus USB-serial or UART export firmware for PC data download.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA88P-20AUR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA88A-AU | ATMEGA88-20AU | ATMEGA328P-AUR | ATMEGA8A-AUR |
|---|---|---|---|---|---|
| Package | 32-TQFP (7x7) | 32-TQFP (7x7) - same | 32-TQFP (7x7) - same | 32-TQFP (7x7) - same | 32-TQFP (7x7) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 8 KB | 8 KB | 8 KB | 32 KB | 8 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 2 KB | 1 KB |
| Max Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 16 MHz |
| picoPower Low Sleep Modes | Yes | No (standard power) | No | Yes | No |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 1.8 V to 5.5 V | 2.7 V to 5.5 V |
| debugWIRE On-chip Debug | Yes | Yes | Yes | Yes | No |
Key Differentiators
- picoPower ultra-low sleep consumption (vs ATMEGA88A-AU)
- 20 MIPS throughput vs older AVR generation (vs ATMEGA8A-AUR)
- Lower cost for 8 KB designs vs ATmega328P (vs ATMEGA328P-AUR)
Design Notes
Decouple each VCC pin (pins 4 and 6) with 100 nF ceramic capacitors placed within 3 mm of the pins, plus one 4.7 uF bulk capacitor near the TQFP. Connect AVCC (pin 18) to VCC through a low-pass filter (10 nF to ground, optionally 10 ohm series) when ADC accuracy matters, and never leave AVCC floating even if the ADC is unused. AREF (pin 20) needs a 100 nF cap to GND; do not attach a capacitor when selecting the internal reference for external-AREF mode. Estimated: at 20 MHz and 5V, active current is roughly 5-6 mA per Microchip typical figures, trivial for most supplies.
Frequency derates with supply voltage: 20 MHz is specified only at 4.5V-5.5V. At 3.3V, keep the clock at or below approximately 13.3 MHz using the CKOUT/clock fuses or a divided crystal. Another frequent error is leaving RESET (pin 29) unmanaged: debugWIRE requires the DWEN fuse and re-uses the reset line, and recovering a part stuck in debugWIRE mode needs a specific high-voltage-free unlock sequence in the programmer tool. Finally, EEPROM writes during power-down need BOD enabled at 2.7V to prevent corruption on brown-out.
Route the crystal (pins 7-8) with short traces and ground guarding on both sides; keep XTAL traces away from high-speed PWM outputs PB1-PB3. For mixed analog/digital boards, keep ADC trace routing (PC0-PC5, ADC6-7) away from switching nodes and provide a solid ground plane under the TQFP. The TQFP-32 thermal pad-free design dissipates negligible heat (<50 mW typical), so no thermal vias are needed. Use pin-1 dot orientation consistently: pin 1 (PD3) is left of the top-center index in the 7x7 mm body per the datasheet pin diagram.
Compliance Information
RoHS compliant lead-free TQFP per Microchip product page; REACH and halogen-free declarations not stated in provided data.
