ATMEGA645A-AU Microchip Integrated Circuit (Quad Flat Packages) In Stock
Microchip ATMEGA645A-AU is an 8-bit AVR RISC microcontroller with 64KB Flash memory and up to 20MHz clock frequency. Supports wide voltage operation from 1.8V at 4MHz to 5V at 20MHz with built-in ADC and JTAG boundary scan. Available in 64-pin TQFP package, in stock worldwide with competitive pricing.
- Manufacturer
- Microchip
- Package
- Quad Flat Packages
- Pin Count
- 64
- Lifecycle
- ACTIVE
- Datasheet
- ATMEGA645A-AU Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $4.6500(MOQ 1)
- 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 ATMEGA645A-AU?
- 8-bit AVR RISC architecture with up to 20MHz clock frequency and wide voltage range from 1.8V to 5.5V
- Built-in ADC and JTAG boundary scan support enabling easy debugging and analog signal acquisition
- 64-pin TQFP package (14x14mm, 0.8mm pitch) with 64KB Flash for feature-rich embedded applications
What is ATMEGA645A-AU used for?
The ATMEGA645A-AU is suited for embedded control applications requiring a high I/O count and broad operating voltage range, such as industrial automation controllers, human-machine interfaces, and smart appliances. Its AVR RISC architecture with 20MHz maximum clock frequency provides excellent performance for real-time processing tasks in consumer electronics and medical devices. The integrated ADC and JTAG boundary scan capability streamline hardware bring-up and simplify manufacturing test in production environments.
What are the specifications of ATMEGA645A-AU?
| 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) | 4096 |
| ROM (words) | 65536 |
| ROM Programmability | FLASH |
| Speed | 16MHz |
| 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 |
| ## ATMEGA645A-AU Alternates Showing results | Image |
| 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 |
Where can I find the ATMEGA645A-AU datasheet?
ATMEGA645A-AU Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for ATMEGA645A-AU?
Compatible alternatives and drop-in replacements for ATMEGA645A-AU:
suggested
suggested
Frequently Asked Questions
What is the maximum operating frequency of the ATMEGA645A-AU?
The ATMEGA645A-AU operates at a maximum clock frequency of 20MHz at standard supply voltage. It also supports lower frequency operation at reduced voltages: 8MHz at 2.7V minimum supply and 4MHz at 1.8V minimum supply, enabling power-optimized designs.
What package does the ATMEGA645A-AU come in?
The ATMEGA645A-AU is housed in a 64-pin TQFP package measuring 14x14mm with 1mm height and 0.80mm pin pitch, conforming to the MS-026AEB standard. This compact surface-mount package is ideal for high I/O density PCB designs.
Does the ATMEGA645A-AU support JTAG debugging?
Yes, the ATMEGA645A-AU includes JTAG boundary scan support, enabling in-circuit debugging, programming, and manufacturing test using standard JTAG tools. This feature significantly reduces development time and simplifies production test fixture design.
What is the minimum supply voltage for the ATMEGA645A-AU?
The ATMEGA645A-AU can operate from a minimum supply voltage of 1.8V at 4MHz clock frequency, making it suitable for battery-powered applications. At 2.7V minimum, it supports up to 8MHz operation, and reaches full 20MHz performance at standard 5V supply.
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
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $6.3800 | $6.38 |
| 20+ | $5.1300 | $102.60 |
| 1000+ | $4.8700 | $4870.00 |
| 5000+ | $4.6500 | $23250.00 |
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