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ATMEGA32L-8AC Equivalent & Substitute Parts
Part Overview
The ATMEGA32L-8AC is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 32KB FLASH memory, 2KB RAM, and 1KB EEPROM. This device integrates 32 I/O pins, multiple communication interfaces (I2C, SPI, UART/USART), and integrated analog-to-digital conversion capabilities in a 44-TQFP surface mount package.
The ATMEGA32L-8AC is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance and production requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 8MHz |
| Program Memory Size | 32KB (16K x 16) |
| Program Memory Type | FLASH |
| RAM Size | 2K x 8 |
| EEPROM Size | 1K x 8 |
| Number of I/O | 32 |
| Voltage Supply Range | 2.7V ~ 5.5V |
| Data Converters | A/D 8x10b |
| Connectivity | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Package / Case | 44-TQFP (10x10) |
| Mounting Type | Surface Mount |
Substitute Part Grouping Explanation
Substitution of the ATMEGA32L-8AC is determined by strict equivalence across the following critical parameters:
- Core Architecture: AVR processor family
- Memory Configuration: 32KB FLASH, 2KB RAM, 1KB EEPROM
- I/O Count: 32 pins minimum
- Operating Voltage: 2.7V ~ 5.5V range
- Package Format: 44-TQFP (10x10) surface mount
- Connectivity Interfaces: I2C, SPI, UART/USART support
- Peripheral Set: Brown-out Detect/Reset, POR, PWM, WDT
The ATMEGA32L-8AU meets all substitution criteria. Both parts share identical core specifications, memory architecture, I/O configuration, and package format. Differences in product status, operating temperature range, and compliance certifications do not affect functional substitutability in applications designed for the ATMEGA32L-8AC.
Parameter Comparison
| Parameter | ATMEGA32L-8AC | ATMEGA32L-8AU |
|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology |
| Core Processor | AVR | AVR |
| Core Size | 8-Bit | 8-Bit |
| Speed | 8MHz | 8MHz |
| Program Memory Size | 32KB (16K x 16) | 32KB (16K x 16) |
| Program Memory Type | FLASH | FLASH |
| RAM Size | 2K x 8 | 2K x 8 |
| EEPROM Size | 1K x 8 | 1K x 8 |
| Number of I/O | 32 | 32 |
| Voltage Supply Range | 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 |
| Package / Case | 44-TQFP (10x10) | 44-TQFP (10x10) |
| Mounting Type | Surface Mount | Surface Mount |
| Operating Temperature | 0°C ~ 70°C | -40°C ~ 85°C |
| Product Status | Obsolete | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
Engineering Selection Recommendations
The ATMEGA32L-8AU is a direct functional substitute for the ATMEGA32L-8AC in applications where the original part is no longer available. Both devices are pin-compatible and functionally equivalent across all core specifications.
Selection of the ATMEGA32L-8AU offers the following advantages:
- Active Product Status: Currently manufactured and supported by Microchip Technology, ensuring long-term availability and supply chain stability
- Extended Operating Temperature Range: -40°C ~ 85°C versus 0°C ~ 70°C, providing broader environmental operating capability
- RoHS3 Compliance: Meets current environmental and regulatory requirements, whereas the ATMEGA32L-8AC is RoHS non-compliant
For applications with strict temperature constraints limited to 0°C ~ 70°C, the ATMEGA32L-8AU remains fully functional and compatible. The extended temperature range does not introduce incompatibility with designs specified for the narrower range.
Frequently Asked Questions (FAQ)
Q: Are the ATMEGA32L-8AC and ATMEGA32L-8AU pin-compatible?
A: Yes. Both devices use the 44-TQFP (10x10) package with identical pin assignments, memory architecture, and I/O configuration. Direct PCB substitution is possible without layout modifications.
Q: What is the difference between the ATMEGA32L-8AC and ATMEGA32L-8AU?
A: The primary differences are product status, operating temperature range, and RoHS compliance. The ATMEGA32L-8AC is obsolete with a 0°C ~ 70°C operating range and RoHS non-compliant status. The ATMEGA32L-8AU is an active product with -40°C ~ 85°C operating range and ROHS3 compliance. Functional specifications and memory configurations are identical.
Q: Can the ATMEGA32L-8AU replace the ATMEGA32L-8AC in existing designs?
A: Yes. The ATMEGA32L-8AU is a direct substitute. No firmware modifications, PCB redesign, or schematic changes are required. Existing code compiled for the ATMEGA32L-8AC will execute identically on the ATMEGA32L-8AU.
Q: What packaging options are available for these parts?
A: Both the ATMEGA32L-8AC and ATMEGA32L-8AU are supplied in 44-TQFP (10x10) surface mount packages. The ATMEGA32L-8AC is supplied in standard packaging, while the ATMEGA32L-8AU is supplied in Tray packaging.
Q: Are there any voltage supply differences between these devices?
A: No. Both devices operate across the identical voltage supply range of 2.7V ~ 5.5V. Power supply design and decoupling requirements remain unchanged.
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