ATMEGA128-8AU Microchip Integrated Circuit (Quad Flat Packages) In Stock
ATMEGA128-8AU is an 8-bit AVR microcontroller with 128 KB in-system programmable Flash, 4 KB EEPROM, 4 KB SRAM, 53 programmable I/O lines, and 8 MHz max clock speed in a 64-pin TQFP package. From $5.00 in stock worldwide shipping.
- Manufacturer
- Microchip
- Package
- Quad Flat Packages
- Pin Count
- 64
- Lifecycle
- OBSOLETE
- Datasheet
- ATMEGA128-8AU Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 128 KB in-system programmable Flash with 10,000 write/erase cycle endurance for reliable firmware storage
- 8-channel 10-bit ADC with optional differential input for precise analog signal acquisition
- Two 8-bit and two 16-bit timers/counters with PWM support for flexible timing and motor control
- Multiple serial interfaces including UART, SPI, and I2C (TWI) enabling versatile system connectivity
Applications
ATMEGA128-8AU is well-suited for industrial control systems, embedded sensor nodes, and robotics platforms requiring 8-bit processing at up to 8 MHz from a 2.7 V to 5.5 V supply. Its 128 KB Flash and rich peripheral set make it ideal for data logging equipment and multi-axis motor controllers. The device also fits consumer electronics prototyping and educational development boards where low cost and broad ecosystem support are priorities.
Specifications
| YTEOL | 0 |
| Has ADC | YES |
| Address Bus Width | 16 |
| Bit Size | 8 |
| Boundary Scan | NO |
| Clock Frequency-Max | 8MHz |
| DAC Channels | NO |
| DMA Channels | NO |
| External Data Bus Width | 8 |
| JESD-30 Code | S-PQFP-G64 |
| JESD-609 Code | e3 |
| Number of I/O Lines | 53 |
| On Chip Program ROM Width | 8 |
| PWM Channels | YES |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | SQUARE |
| Package Style | FLATPACK, THIN PROFILE |
| Qualification Status | Not Qualified |
| ROM (words) | 131072 |
| ROM Programmability | FLASH |
| Speed | 8MHz |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 3V |
| Supply Voltage-Nom | 3V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | MATTE TIN |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.8mm |
| Terminal Position | QUAD |
| uPs/uCs/Peripheral ICs Type | MICROCONTROLLER, RISC |
| Package | Quad Flat Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 3 |
| HTS Code | 8542.31.00.15 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for ATMEGA128-8AU:
Frequently Asked Questions
What clock speed and supply voltage does ATMEGA128-8AU support for real-time control tasks?
ATMEGA128-8AU runs at up to 8 MHz from a 2.7 V to 5.5 V supply, making it suitable for real-time control loops where deterministic 125 ns instruction cycles and wide voltage tolerance are required in battery-powered or industrial systems.
How much non-volatile storage does ATMEGA128-8AU provide for firmware and calibration data?
The device integrates 128 KB of in-system programmable Flash with 10,000 write/erase cycles, 4 KB of EEPROM with 100,000 write/erase cycles, and 4 KB of internal SRAM, providing ample space for firmware, lookup tables, and calibration coefficients without external memory in most embedded designs.
Which analog measurement scenarios benefit from the ATMEGA128-8AU ADC compared to lower-pin-count AVR devices?
ATMEGA128-8AU includes an 8-channel 10-bit successive approximation ADC with optional 200x differential gain, enabling precision temperature sensing, pressure measurement, and multi-channel analog data acquisition across 53 I/O lines—significantly more coverage than 28-pin or 40-pin AVR alternatives at the same 8 MHz performance tier.
When does selecting ATMEGA128-8AU over ATMEGA64-8AU make sense from a memory and I/O perspective?
ATMEGA128-8AU doubles the Flash to 128 KB and adds an external memory bus interface supporting up to 64 KB of external SRAM, making it the better choice when the 64 KB Flash of the ATMEGA64-8AU is insufficient for large communication stacks, bootloaders combined with application code, or designs requiring more than 40 concurrent I/O signals.
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