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ATMEGA8-16AI Equivalent & Substitute Parts
Part Overview
The ATMEGA8-16AI is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 8KB of FLASH program memory, 1KB of RAM, and 512 bytes of EEPROM. This device operates at 16MHz with integrated peripherals including I2C, SPI, and UART/USART connectivity, along with analog-to-digital conversion capabilities. The ATMEGA8-16AI is classified as obsolete, making identification of functionally equivalent alternatives necessary 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 | 8KB (4K x 16) |
| Program Memory Type | FLASH |
| RAM Size | 1K x 8 |
| EEPROM Size | 512 x 8 |
| Voltage Supply (Vcc/Vdd) | 4.5V ~ 5.5V |
| Number of I/O | 23 |
| Data Converters | A/D 8x10b |
| Connectivity | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount |
| Package / Case | 32-TQFP (7x7) |
Substitute Part Grouping Explanation
Substitution of the ATMEGA8-16AI is determined by strict equivalence across the following critical parameters:
- Core Architecture: AVR processor family
- Memory Configuration: 8KB FLASH, 1KB RAM, 512 bytes EEPROM
- Operating Frequency: 16MHz
- Supply Voltage Range: 4.5V ~ 5.5V
- I/O Count: 23 pins
- Peripheral Set: I2C, SPI, UART/USART, PWM, WDT, Brown-out Detect/Reset, POR
- Analog Capability: 8-channel 10-bit ADC
- Package: 32-TQFP (7x7) surface mount
The ATMEGA8-16AU meets all these criteria and is therefore a direct functional equivalent. The primary distinction between these parts is product status and packaging format.
Parameter Comparison
| Parameter | ATMEGA8-16AI | ATMEGA8-16AU |
|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology |
| Core Processor | AVR | AVR |
| Core Size | 8-Bit | 8-Bit |
| Speed | 16MHz | 16MHz |
| Program Memory Size | 8KB (4K x 16) | 8KB (4K x 16) |
| Program Memory Type | FLASH | FLASH |
| RAM Size | 1K x 8 | 1K x 8 |
| EEPROM Size | 512 x 8 | 512 x 8 |
| Voltage Supply (Vcc/Vdd) | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Number of I/O | 23 | 23 |
| Data Converters | A/D 8x10b | A/D 8x10b |
| Connectivity | I2C, SPI, UART/USART | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT | Brown-out Detect/Reset, POR, PWM, WDT |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 32-TQFP (7x7) | 32-TQFP (7x7) |
| Product Status | Obsolete | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
| Packaging Format | Tube | Tray |
Engineering Selection Recommendations
The ATMEGA8-16AU is the direct substitute for the ATMEGA8-16AI. Both devices are electrically and functionally identical across all specified parameters. Selection between these parts should be based on the following factors:
Product Status: The ATMEGA8-16AI is obsolete, while the ATMEGA8-16AU maintains active product status with ongoing manufacturer support and availability.
Compliance: The ATMEGA8-16AU is ROHS3 compliant, whereas the ATMEGA8-16AI is RoHS non-compliant. For applications subject to RoHS regulations, the ATMEGA8-16AU is the required selection.
Packaging: The ATMEGA8-16AI is supplied in tube packaging, while the ATMEGA8-16AU is supplied in tray packaging. Packaging selection depends on production volume and handling requirements.
Programmability Verification: The ATMEGA8-16AU is verified as programmable through DiGi-Electronics channels, providing additional assurance for production environments.
Frequently Asked Questions (FAQ)
Q: Are the ATMEGA8-16AI and ATMEGA8-16AU pin-compatible?
A: Yes. Both devices use the 32-TQFP (7x7) package with identical pinout and electrical characteristics. Direct PCB substitution is possible without layout modifications.
Q: Can the ATMEGA8-16AU replace the ATMEGA8-16AI in existing designs?
A: Yes. The ATMEGA8-16AU is a direct functional equivalent with identical memory configuration, operating frequency, supply voltage range, and peripheral set. No firmware or hardware modifications are required.
Q: What is the difference between tube and tray packaging?
A: Tube packaging is used for lower-volume orders and manual handling, while tray packaging is optimized for automated pick-and-place assembly. The electrical and functional characteristics of the device are identical regardless of packaging format.
Q: Why is the ATMEGA8-16AI classified as obsolete?
A: Microchip Technology has discontinued the ATMEGA8-16AI in favor of the ATMEGA8-16AU, which offers improved compliance status and active production support. The ATMEGA8-16AU provides identical functionality with enhanced regulatory compliance.
Q: Does RoHS3 compliance affect device performance?
A: No. RoHS3 compliance relates to material composition and environmental standards, not electrical performance. The ATMEGA8-16AU operates identically to the ATMEGA8-16AI across all specified electrical parameters.
Q: Are there any memory or speed differences between these parts?
A: No. Both the ATMEGA8-16AI and ATMEGA8-16AU feature 8KB FLASH program memory, 1KB RAM, 512 bytes EEPROM, and operate at 16MHz. Memory configuration and performance are identical.
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