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ATMEGA644P-15MZ Equivalent & Substitute Parts
Part Overview
The ATMEGA644P-15MZ is an 8-bit AVR microcontroller from Microchip Technology, featuring 64KB FLASH memory, 4KB RAM, and 2KB EEPROM. This device integrates 32 I/O pins, multiple communication interfaces (I2C, SPI, UART/USART), and operates at 16MHz with a supply voltage range of 2.7V to 5.5V. The part is qualified to AEC-Q100 automotive standards and complies with ROHS3 and REACH requirements.
The ATMEGA644P-15MZ is classified as obsolete. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term product availability for applications currently utilizing this microcontroller.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 16MHz |
| Program Memory Size | 64KB (32K x 16) |
| Program Memory Type | FLASH |
| EEPROM Size | 2K x 8 |
| RAM Size | 4K x 8 |
| Number of I/O | 32 |
| 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 ~ 125°C (TA) |
| Mounting Type | Surface Mount |
| Package / Case | 44-VFQFN Exposed Pad |
| Grade | Automotive |
| Qualification | AEC-Q100 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) |
Substitute Part Grouping Explanation
Substitution of the ATMEGA644P-15MZ is determined by strict equivalence across the following critical parameters:
- Core Architecture: AVR processor family
- Memory Configuration: 64KB FLASH, 4KB RAM, 2KB EEPROM
- Clock Speed: 16MHz operation
- I/O Count: 32 I/O pins
- Supply Voltage Range: 2.7V ~ 5.5V
- Package: 44-VFQFN Exposed Pad (7x7mm)
- Connectivity Interfaces: I2C, SPI, UART/USART
- Peripheral Set: Brown-out Detect/Reset, POR, PWM, WDT
- Data Conversion: A/D 8x10b
- Automotive Qualification: AEC-Q100
- Compliance: ROHS3, REACH Unaffected
The ATMEGA644P-A15MZ meets all these criteria and is classified as a parametric equivalent. The primary distinction is product status: the main part is obsolete while the substitute is active, ensuring ongoing availability.
Parameter Comparison
| Parameter | ATMEGA644P-15MZ | ATMEGA644P-A15MZ |
|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology |
| Core Processor | AVR | AVR |
| Core Size | 8-Bit | 8-Bit |
| Speed | 16MHz | 16MHz |
| Program Memory Size | 64KB (32K x 16) | 64KB (32K x 16) |
| Program Memory Type | FLASH | FLASH |
| EEPROM Size | 2K x 8 | 2K x 8 |
| RAM Size | 4K x 8 | 4K x 8 |
| Number of I/O | 32 | 32 |
| 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 ~ 125°C (TA) | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 44-VFQFN Exposed Pad | 44-VFQFN Exposed Pad |
| Grade | Automotive | Automotive |
| Qualification | AEC-Q100 | AEC-Q100 |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) | 3 (168 Hours) |
| Product Status | Obsolete | Active |
Engineering Selection Recommendations
The ATMEGA644P-A15MZ is a direct parametric equivalent to the ATMEGA644P-15MZ. Both devices share identical electrical specifications, memory configurations, I/O capabilities, and package geometry. The substitute part maintains full automotive qualification (AEC-Q100) and compliance certifications (ROHS3, REACH Unaffected).
The primary advantage of selecting ATMEGA644P-A15MZ is its active product status, which ensures sustained supply chain availability and manufacturing support. For applications currently using ATMEGA644P-15MZ, migration to ATMEGA644P-A15MZ requires no design modifications, as all functional and electrical parameters are equivalent.
Frequently Asked Questions (FAQ)
Q: Can ATMEGA644P-A15MZ be used as a direct replacement for ATMEGA644P-15MZ?
A: Yes. Both parts are parametrically equivalent across all critical specifications including memory size, clock speed, I/O count, supply voltage range, package type, and peripheral set. No circuit modifications are required.
Q: Are there any differences in automotive qualification between these parts?
A: No. Both the ATMEGA644P-15MZ and ATMEGA644P-A15MZ are qualified to AEC-Q100 automotive standards and comply with ROHS3 and REACH requirements.
Q: What is the significance of the product status difference?
A: The ATMEGA644P-15MZ is classified as obsolete, indicating discontinued manufacturing. The ATMEGA644P-A15MZ is active, meaning it is currently manufactured and supported by Microchip Technology. For new designs or long-term supply requirements, the active part is recommended.
Q: Are the package dimensions identical?
A: Yes. Both parts use the 44-VFQFN Exposed Pad package with 7x7mm dimensions. PCB footprints and assembly processes are identical.
Q: Do these parts have the same moisture sensitivity level?
A: Yes. Both parts have MSL 3 rating with a 168-hour floor life, requiring identical handling and storage procedures.
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