ATMEGA325A-AU Microchip Integrated Circuit (Quad Flat Packages) In Stock
The ATMEGA325A-AU is an 8-bit AVR RISC microcontroller running at up to 20 MHz with 32 kB Flash, 2 kB SRAM, and 1 kB EEPROM in a compact 64-pin TQFP package. It integrates I2C, SPI, USART interfaces, a 10-bit ADC with up to 8 channels, and operates from 1.8 V to 5.5 V. Available from stock worldwide with RoHS compliance.
- Manufacturer
- Microchip
- Package
- Quad Flat Packages
- Pin Count
- 64
- Lifecycle
- ACTIVE
- Datasheet
- ATMEGA325A-AU 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
- 8-bit AVR RISC core at up to 20 MHz with 32 kB Flash and 2 kB SRAM for embedded control tasks
- Wide supply voltage range from 1.8 V to 5.5 V supporting battery-powered and 5 V industrial designs
- Integrated 10-bit ADC with multiple channels plus I2C, SPI, and USART for versatile connectivity
- 64-pin TQFP package with boundary scan (JTAG) support for production testing and in-system programming
Applications
The ATMEGA325A-AU is ideal for embedded control applications such as industrial sensor nodes, consumer electronics, and portable medical devices requiring low-power operation down to 1.8 V. Its 32 kB Flash and rich peripheral set make it suitable for HMI panels, motor control, and wireless module firmware. The 64-pin TQFP footprint integrates easily into compact PCB designs where space is constrained.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | TQFP-64 |
| Factory Lead Time | 10Weeks |
| YTEOL | 14 |
| Has ADC | YES |
| Additional Feature | ALSO OPERATES AT 2.7 V MINIMUM SUPPLY AT 8 MHZ AND 1.8 V MINIMUM SUPPLY AT 4 MHZ |
| Bit Size | 8 |
| Boundary Scan | YES |
| CPU Family | AVR RISC |
| Clock Frequency-Max | 20MHz |
| DAC Channels | NO |
| DMA Channels | NO |
| Format | FIXED POINT |
| Integrated Cache | NO |
| JESD-30 Code | S-PQFP-G64 |
| JESD-609 Code | e3 |
| Low Power Mode | YES |
| Number of External Interrupts | 32 |
| Number of I/O Lines | 54 |
| Number of Serial I/Os | 1 |
| Number of Timers | 3 |
| On Chip Data RAM Width | 8 |
| On Chip Program ROM Width | 8 |
| PWM Channels | YES |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TQFP64,.63SQ,32 |
| Package Shape | SQUARE |
| Package Style | FLATPACK, THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| RAM (bytes) | 2048 |
| ROM (words) | 32768 |
| ROM Programmability | FLASH |
| Speed | 20MHz |
| Supply Current-Max | 12mA |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 5V |
| Supply Voltage-Nom | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| 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 1 |
| ECCN | EAR99 |
| HTS Code | 8542.31.00.01 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for ATMEGA325A-AU:
RISC Microcontroller, 8-Bit, FLASH, AVR RISC CPU, 20MHz, CMOS, PQFP64
Frequently Asked Questions
What memory resources does ATMEGA325A-AU offer for firmware development at 20 MHz?
ATMEGA325A-AU provides 32 kB of in-system programmable Flash, 2 kB of SRAM, and 1 kB of EEPROM, all accessible at up to 20 MHz clock frequency. This memory configuration supports moderately complex embedded firmware with persistent data storage without external memory chips.
Which voltage range does ATMEGA325A-AU support, and how does that affect battery-powered designs?
ATMEGA325A-AU operates from 1.8 V to 5.5 V, running at up to 4 MHz at 1.8 V and up to 8 MHz at 2.7 V, and up to 20 MHz at 5 V. This flexibility allows single-cell lithium or AA battery operation without a boost converter in low-frequency applications.
How does the ATMEGA325A-AU compare to ATMEGA164A for designs needing more I/O pins?
ATMEGA325A-AU uses a 64-pin TQFP package offering more I/O pins than the 44-pin TQFP of ATMEGA164A, while both share the same 8-bit AVR core at 20 MHz and similar 32 kB Flash. Choose ATMEGA325A-AU when your design requires more GPIO lines, larger LCD segments, or additional ADC inputs beyond what 44-pin variants provide.
What communication interfaces are available on ATMEGA325A-AU for sensor integration?
ATMEGA325A-AU integrates hardware I2C (TWI), SPI, and USART interfaces, plus a 10-bit ADC with up to 8 single-ended channels. This allows direct connection to common sensors such as I2C temperature sensors, SPI displays, and analog transducers within a single 64-pin TQFP device.
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