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
What are the key features of ATMEGA128-8AU?
- 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
What is ATMEGA128-8AU used for?
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.
What are the specifications of ATMEGA128-8AU?
| 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 |
Where can I find the ATMEGA128-8AU datasheet?
ATMEGA128-8AU Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for ATMEGA128-8AU?
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.
Related Guides
CSD87313DMS Synchronous Buck Power Stage Design Guide
Design a compact CSD87313DMS synchronous buck stage with practical guidance for loss, gate drive, PCB layout, EMI, thermal validation, and sourcing.
Aug 6, 2026
STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection
Choose STEF05SGR for 5 V overcurrent protection by checking current-limit margin, inrush, thermal loss, fault response, and sourcing.
Aug 6, 2026
C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC
Select C0402C103K3RACTU by voltage margin, X7R behavior, tolerance, 0402 assembly risk, and qualified alternatives.
Aug 4, 2026
STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security
Choose STM32H753VIT6 by evaluating memory architecture, LQFP-100 pin fit, connectivity, security, power, and sourcing tradeoffs.
Aug 4, 2026
Why Buy from FindMyChip
About Microchip
Microchip is a leading electronic component manufacturer. FindMyChip sources Microchip ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
More from Microchip
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“FindMyChip sourced our entire STM32 BOM in 48 hours when our usual distributor had 16-week lead times.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit