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ATMEGA324PA-PU Equivalent & Substitute Parts
Part Overview
The ATMEGA324PA-PU is an 8-bit AVR microcontroller from Microchip Technology's ATmega series, featuring 32KB FLASH program memory, 2KB RAM, and 1KB EEPROM. This device integrates 32 I/O pins, multiple communication interfaces (I2C, SPI, UART/USART), and analog-to-digital conversion capabilities. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | ATMEGA324PA-PU |
| Manufacturer | Microchip Technology |
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 20MHz |
| 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 |
| Connectivity | I2C, SPI, UART/USART |
| Data Converters | A/D 8x10b |
| Voltage Supply (Vcc/Vdd) | 1.8V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Through Hole |
| Package / Case | 40-DIP (0.600", 15.24mm) |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the ATMEGA324PA-PU 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
- Communication Interfaces: I2C, SPI, UART/USART support
- Analog Capability: 8-channel 10-bit ADC
- Electrical Specifications: 1.8V ~ 5.5V supply range, -40°C ~ 85°C operating temperature
- Physical Package: 40-DIP form factor with 0.600" (15.24mm) pitch
- Compliance: ROHS3 compliance and REACH unaffected status
The ATMEGA324A-PU meets all these criteria and is classified as a parametric equivalent. Both parts share identical functional specifications, memory architecture, peripheral set, and package dimensions.
Parameter Comparison
| Parameter | ATMEGA324PA-PU | ATMEGA324A-PU |
|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology |
| Core Processor | AVR | AVR |
| Core Size | 8-Bit | 8-Bit |
| Speed | 20MHz | 20MHz |
| 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 |
| 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 |
| Voltage Supply (Vcc/Vdd) | 1.8V ~ 5.5V | 1.8V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Through Hole | Through Hole |
| Package / Case | 40-DIP (0.600", 15.24mm) | 40-DIP (0.600", 15.24mm) |
| Product Status | Obsolete | Obsolete |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| REACH Status | REACH Unaffected | REACH Unaffected |
Engineering Selection Recommendations
Both the ATMEGA324PA-PU and ATMEGA324A-PU are classified as obsolete products. Selection between these parts should be based on availability and compliance requirements. Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for current manufacturing standards. The ATMEGA324A-PU currently shows higher inventory availability (6100 pcs) compared to the ATMEGA324PA-PU (1091 pcs), which may influence procurement decisions for production volumes. Pin-for-pin compatibility and identical electrical specifications ensure direct substitution without circuit modification.
Frequently Asked Questions (FAQ)
Q: Are the ATMEGA324PA-PU and ATMEGA324A-PU pin-compatible?
A: Yes. Both devices use the 40-DIP package with identical pin assignments, voltage specifications, and I/O configurations. Direct substitution is possible without PCB redesign.
Q: What is the difference between these two part numbers?
A: The ATMEGA324PA-PU and ATMEGA324A-PU are parametric equivalents with identical functional specifications, memory architecture, and peripheral sets. The suffix variation reflects manufacturing revision levels within the ATmega324 product line.
Q: Can I use the ATMEGA324A-PU as a replacement in existing designs?
A: Yes. The ATMEGA324A-PU meets all electrical, mechanical, and functional requirements of the ATMEGA324PA-PU. No design changes are required for direct substitution.
Q: Are both parts compliant with current regulatory standards?
A: Yes. Both the ATMEGA324PA-PU and ATMEGA324A-PU are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.
Q: What communication protocols does this microcontroller support?
A: The ATMEGA324PA-PU and ATMEGA324A-PU support I2C, SPI, and UART/USART communication interfaces, enabling integration with standard industrial and embedded communication networks.
Q: What is the maximum operating frequency?
A: Both devices operate at a maximum frequency of 20MHz with a supply voltage range of 1.8V to 5.5V.
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