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ATMEGA8L-8AI Equivalent & Substitute Parts
Part Overview
The ATMEGA8L-8AI is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 8KB FLASH program memory, 1KB RAM, and 512 bytes EEPROM. This device integrates 23 I/O pins, internal oscillator, and peripheral support for I2C, SPI, and UART/USART communication protocols. The ATMEGA8L-8AI is classified as obsolete, necessitating identification of active equivalent parts for new designs and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 8MHz |
| Program Memory Size | 8KB (4K x 16) |
| Program Memory Type | FLASH |
| EEPROM Size | 512 x 8 |
| RAM Size | 1K x 8 |
| Number of I/O | 23 |
| Voltage Supply (Vcc/Vdd) | 2.7V ~ 5.5V |
| 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) |
| Oscillator Type | Internal |
Substitute Part Grouping Explanation
Substitution of the ATMEGA8L-8AI is determined by strict equivalence across the following critical parameters:
- Core Architecture: AVR processor family
- Memory Configuration: 8KB FLASH, 1KB RAM, 512 bytes EEPROM
- I/O Count: 23 pins minimum
- Operating Voltage: 2.7V ~ 5.5V range
- Package: 32-TQFP (7x7) form factor
- Peripheral Set: I2C, SPI, UART/USART, PWM, WDT, Brown-out Detect/Reset, POR
- Speed: 8MHz operation
- Data Conversion: 8-channel 10-bit ADC
The ATMEGA8L-8AU meets all substitution criteria as a direct functional equivalent with identical electrical and mechanical specifications. The primary distinction is product status and compliance certification.
Parameter Comparison
| Parameter | ATMEGA8L-8AI | ATMEGA8L-8AU |
|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology |
| Core Processor | AVR | AVR |
| Core Size | 8-Bit | 8-Bit |
| Speed | 8MHz | 8MHz |
| Program Memory Size | 8KB (4K x 16) | 8KB (4K x 16) |
| Program Memory Type | FLASH | FLASH |
| EEPROM Size | 512 x 8 | 512 x 8 |
| RAM Size | 1K x 8 | 1K x 8 |
| Number of I/O | 23 | 23 |
| Voltage Supply (Vcc/Vdd) | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| 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) |
| Oscillator Type | Internal | Internal |
| Product Status | Obsolete | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) | 3 (168 Hours) |
| REACH Status | REACH Unaffected | REACH Unaffected |
Engineering Selection Recommendations
The ATMEGA8L-8AU is the direct substitute for the obsolete ATMEGA8L-8AI. Both devices are electrically and mechanically identical across all functional parameters. Selection of the ATMEGA8L-8AU is justified by the following factors:
- Product Status: The ATMEGA8L-8AU maintains active production status, ensuring supply chain availability and long-term support.
- Compliance: The ATMEGA8L-8AU is ROHS3 compliant, meeting current environmental and regulatory requirements. The ATMEGA8L-8AI is RoHS non-compliant.
- Functional Equivalence: All electrical specifications, memory configurations, I/O counts, peripheral sets, and operating parameters are identical.
- Package Compatibility: Both devices use the 32-TQFP (7x7) package, enabling direct PCB layout compatibility without redesign.
Frequently Asked Questions (FAQ)
Q: Can the ATMEGA8L-8AU be used as a direct replacement for the ATMEGA8L-8AI in existing designs?
A: Yes. The ATMEGA8L-8AU is functionally and electrically identical to the ATMEGA8L-8AI. Both devices share the same 32-TQFP package, pinout, memory configuration, and peripheral set. No circuit modifications are required.
Q: What is the primary difference between these two parts?
A: The ATMEGA8L-8AI is classified as obsolete, while the ATMEGA8L-8AU is in active production. Additionally, the ATMEGA8L-8AU is ROHS3 compliant, whereas the ATMEGA8L-8AI is RoHS non-compliant.
Q: Are there any compatibility concerns with the 32-TQFP package?
A: No. Both parts use identical 32-TQFP (7x7) packaging. Pin assignments, spacing, and mechanical dimensions are equivalent, allowing direct PCB substitution.
Q: Does the ATMEGA8L-8AU support the same communication protocols?
A: Yes. Both devices support I2C, SPI, and UART/USART connectivity protocols identically.
Q: What is the moisture sensitivity level for these devices?
A: Both the ATMEGA8L-8AI and ATMEGA8L-8AU have a Moisture Sensitivity Level (MSL) of 3, with a floor life of 168 hours.
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