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ATMEGA329-16AI Equivalent & Substitute Parts
Part Overview
The ATMEGA329-16AI is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 32KB FLASH memory, 2KB RAM, and 1KB EEPROM. This device integrates 54 I/O pins, operates at 16MHz, and supports multiple connectivity protocols including SPI, UART/USART, and USI. The part is classified as obsolete, making identification of compatible substitutes essential for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 16MHz |
| Program Memory Size | 32KB (16K x 16) |
| Program Memory Type | FLASH |
| EEPROM Size | 1K x 8 |
| RAM Size | 2K x 8 |
| Number of I/O | 54 |
| Voltage Supply (Vcc/Vdd) | 2.7V ~ 5.5V |
| Data Converters | A/D 8x10b |
| Connectivity | SPI, UART/USART, USI |
| Peripherals | Brown-out Detect/Reset, LCD, POR, PWM, WDT |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 64-TQFP (14x14) |
| Mounting Type | Surface Mount |
Substitute Part Grouping Explanation
Substitution of the ATMEGA329-16AI is determined by strict equivalence across all electrical and mechanical parameters. The substitute part must maintain identical specifications for core processor architecture, memory configuration, I/O count, operating voltage range, temperature rating, and physical package dimensions. The ATMEGA329-16AU qualifies as a direct substitute based on complete parameter alignment across all critical functional and physical attributes.
Parameter Comparison
| Parameter | ATMEGA329-16AI | ATMEGA329-16AU |
|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology |
| Core Processor | AVR | AVR |
| Core Size | 8-Bit | 8-Bit |
| Speed | 16MHz | 16MHz |
| Program Memory Size | 32KB (16K x 16) | 32KB (16K x 16) |
| Program Memory Type | FLASH | FLASH |
| EEPROM Size | 1K x 8 | 1K x 8 |
| RAM Size | 2K x 8 | 2K x 8 |
| Number of I/O | 54 | 54 |
| Voltage Supply (Vcc/Vdd) | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Data Converters | A/D 8x10b | A/D 8x10b |
| Connectivity | SPI, UART/USART, USI | SPI, UART/USART, USI |
| Peripherals | Brown-out Detect/Reset, LCD, POR, PWM, WDT | Brown-out Detect/Reset, LCD, POR, PWM, WDT |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Package / Case | 64-TQFP (14x14) | 64-TQFP (14x14) |
| Mounting Type | Surface Mount | Surface Mount |
| 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 ATMEGA329-16AU is the direct substitute for the obsolete ATMEGA329-16AI. Both parts are electrically and mechanically identical across all functional parameters. The primary distinction is product status and regulatory compliance: the ATMEGA329-16AU maintains active production status and achieves ROHS3 compliance, whereas the ATMEGA329-16AI is obsolete and RoHS non-compliant. For new designs or production continuity, the ATMEGA329-16AU is the appropriate selection. Both parts share identical MSL ratings and require equivalent handling procedures during assembly.
Frequently Asked Questions (FAQ)
Q: Are ATMEGA329-16AI and ATMEGA329-16AU pin-compatible? A: Yes. Both devices use the 64-TQFP (14x14) package with identical pin assignments and electrical characteristics.
Q: What is the difference between the two part numbers? A: The suffix designates packaging format. The ATMEGA329-16AI uses tube packaging, while the ATMEGA329-16AU uses tray packaging. Electrical specifications are identical.
Q: Can I use ATMEGA329-16AU in place of ATMEGA329-16AI? A: Yes. The ATMEGA329-16AU is a direct functional and physical substitute. It provides the additional benefit of active production status and ROHS3 compliance.
Q: Are there any memory or performance differences? A: No. Both parts feature identical 32KB FLASH, 2KB RAM, 1KB EEPROM, 16MHz operation, and 54 I/O pins.
Q: What are the moisture sensitivity requirements? A: Both parts carry MSL rating 3, requiring storage at ≤30% relative humidity and limiting floor life to 168 hours after moisture exposure.
Q: Is the operating temperature range the same? A: Yes. Both parts operate across -40°C to 85°C ambient temperature range.
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