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ATMEGA64-16AC Equivalent & Substitute Parts
Part Overview
The ATMEGA64-16AC is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 64KB of FLASH program memory, 4KB of RAM, and 2KB of EEPROM. This device operates at 16MHz with a 64-pin TQFP package and integrates multiple communication interfaces including I2C, SPI, and UART/USART connectivity.
The ATMEGA64-16AC is classified as obsolete. Identifying equivalent and substitute parts is necessary to support legacy system maintenance, design updates, and procurement continuity when original inventory becomes unavailable.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 16MHz |
| Program Memory Size | 64KB (32K x 16) |
| Program Memory Type | FLASH |
| RAM Size | 4K x 8 |
| EEPROM Size | 2K x 8 |
| Voltage Supply (Vcc/Vdd) | 4.5V ~ 5.5V |
| Number of I/O | 53 |
| Connectivity | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Data Converters | A/D 8x10b |
| Package / Case | 64-TQFP (14x14) |
| Mounting Type | Surface Mount |
Substitute Part Grouping Explanation
Substitution of the ATMEGA64-16AC is determined by strict equivalence across the following critical parameters:
- Core Architecture: AVR processor family
- Memory Configuration: 64KB FLASH, 4KB RAM, 2KB EEPROM
- Clock Speed: 16MHz operation
- Package Format: 64-pin TQFP (14x14mm)
- I/O Count: 53 I/O pins
- Connectivity Interfaces: I2C, SPI, UART/USART support
- Peripheral Set: Brown-out Detect/Reset, POR, PWM, WDT
The ATMEGA64-16AU meets all these criteria and qualifies as a direct substitute. Differences in operating temperature range, product status, and compliance certifications do not affect functional or electrical compatibility at the component level.
Parameter Comparison
| Parameter | ATMEGA64-16AC | ATMEGA64-16AU |
|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology |
| Core Processor | AVR | AVR |
| Core Size | 8-Bit | 8-Bit |
| Speed | 16MHz | 16MHz |
| Program Memory Size | 64KB (32K x 16) | 64KB (32K x 16) |
| Program Memory Type | FLASH | FLASH |
| RAM Size | 4K x 8 | 4K x 8 |
| EEPROM Size | 2K x 8 | 2K x 8 |
| Voltage Supply (Vcc/Vdd) | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Number of I/O | 53 | 53 |
| Connectivity | I2C, SPI, UART/USART | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT | Brown-out Detect/Reset, POR, PWM, WDT |
| Data Converters | A/D 8x10b | A/D 8x10b |
| Package / Case | 64-TQFP (14x14) | 64-TQFP (14x14) |
| Mounting Type | Surface Mount | Surface Mount |
| Operating Temperature | 0°C ~ 70°C (TA) | -40°C ~ 85°C (TA) |
| Product Status | Obsolete | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) | 3 (168 Hours) |
Engineering Selection Recommendations
The ATMEGA64-16AU is the direct substitute for the ATMEGA64-16AC. Both devices are electrically and functionally identical across all core parameters including memory, speed, I/O configuration, and peripheral set.
Selection of the ATMEGA64-16AU is supported by the following factors:
- Active Product Status: The ATMEGA64-16AU is in active production, ensuring long-term availability and supply chain stability.
- Regulatory Compliance: The ATMEGA64-16AU is ROHS3 compliant, meeting current environmental and regulatory requirements.
- Extended Operating Range: The ATMEGA64-16AU supports an operating temperature range of -40°C to 85°C, providing broader environmental tolerance compared to the obsolete ATMEGA64-16AC (0°C to 70°C).
- Verified Programmability: The ATMEGA64-16AU is verified as programmable through DiGi-Electronics channels.
The ATMEGA64-16AU maintains identical pinout, package dimensions, and electrical characteristics, enabling direct replacement in existing PCB designs without layout modifications.
Frequently Asked Questions (FAQ)
Q: Can the ATMEGA64-16AU be used as a direct replacement for the ATMEGA64-16AC in existing designs?
A: Yes. The ATMEGA64-16AU is a direct substitute. Both devices share identical core architecture, memory configuration, clock speed, pin count, and peripheral set. No design modifications are required.
Q: What is the difference in operating temperature range between these parts?
A: The ATMEGA64-16AC operates from 0°C to 70°C, while the ATMEGA64-16AU operates from -40°C to 85°C. The extended range of the ATMEGA64-16AU provides greater environmental tolerance for applications requiring operation in wider temperature conditions.
Q: Are the packages identical?
A: Yes. Both the ATMEGA64-16AC and ATMEGA64-16AU use the 64-pin TQFP package with 14x14mm dimensions. Pin assignments and electrical characteristics are identical.
Q: What is the significance of the RoHS compliance difference?
A: The ATMEGA64-16AC is RoHS non-compliant, while the ATMEGA64-16AU is ROHS3 compliant. For new designs or systems subject to environmental regulations, the ATMEGA64-16AU is the appropriate choice.
Q: Are there any memory or performance differences?
A: No. Both devices feature 64KB FLASH program memory, 4KB RAM, 2KB EEPROM, and operate at 16MHz. Memory organization and performance characteristics are identical.
Q: What is the Moisture Sensitivity Level (MSL) for these parts?
A: Both the ATMEGA64-16AC and ATMEGA64-16AU have an MSL rating of 3 with a 168-hour floor life. Identical moisture handling and storage requirements apply to both devices.
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