ATSAM3N4AA-MU Equivalent & Substitute Parts

Part Overview

The ATSAM3N4AA-MU is an ARM Cortex-M3 SAM3N microcontroller IC featuring 32-bit single-core architecture, 48MHz clock speed, and 256KB FLASH memory in a 48-QFN (7x7) surface mount package. This device is classified as obsolete, necessitating identification of equivalent substitute parts for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility within the specified voltage supply range (1.62V ~ 3.6V), identical package form factor (48-QFN 7x7), and compatible I/O count (34 pins) while meeting current product availability and compliance standards.

Substiute Parts

ATSAM3N4AA-MU

Microchip TechnologyIn Stock: 18336ATSAM3N4AA-MU Datasheet

Current PartRFQ

ATSAM4N8AA-MU

Microchip TechnologyIn Stock: 1054ATSAM4N8AA-MU Datasheet

DirectRFQ

ATSAM4S4AA-MU

Microchip TechnologyIn Stock: 4095ATSAM4S4AA-MU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ATSAM3N4AA-MU are selected based on the following critical parameters that determine functional and physical compatibility:

Mandatory Compatibility Criteria:

• Identical package form factor: 48-QFN (7x7) with exposed pad
• Identical I/O pin count: 34 pins
• Voltage supply range overlap: 1.62V ~ 3.6V
• Surface mount mounting type
• Operating temperature range: -40°C ~ 85°C
• Connectivity support: I2C, IrDA, SPI, UART/USART
• Peripheral support: Brown-out Detect/Reset, DMA, POR, PWM, WDT

Allowable Parameter Variations:

• Core processor architecture: ARM Cortex-M3 or ARM Cortex-M4
• Clock speed: Equal to or greater than 48MHz
• Program memory size: Equal to or greater than 256KB FLASH
• RAM size: Equal to or greater than 24K x 8
• Data converter resolution: Equal to or greater than 10-bit A/D
• Product status: Active preferred over obsolete
• Compliance certifications: ROHS3 Compliant, REACH Unaffected

Parameter Comparison

Engineering Selection Recommendations

ATSAM4N8AA-MU is a direct substitute offering enhanced performance within the SAM4N series. This part maintains identical electrical specifications (1.62V ~ 3.6V supply voltage), package form factor (48-QFN 7x7), and I/O configuration (34 pins). The SAM4N8AA-MU provides increased processing capability (100MHz vs. 48MHz) and expanded memory resources (512KB FLASH, 64K x 8 RAM vs. 256KB FLASH, 24K x 8 RAM). Active product status ensures long-term availability and supply chain stability. ROHS3 compliance and REACH unaffected status maintain regulatory alignment.

ATSAM4S4AA-MU is the manufacturer-recommended substitute offering superior performance characteristics within the SAM4S series. This part maintains identical electrical specifications (1.62V ~ 3.6V supply voltage), package form factor (48-QFN 7x7), and I/O configuration (34 pins). The SAM4S4AA-MU provides the highest processing speed (120MHz), enhanced data conversion capability (8x12b A/D vs. 8x10b A/D), and extended connectivity options including USB and Memory Card support. Active product status and full compliance certifications support production continuity.

Both substitute parts are electrically and mechanically compatible with the ATSAM3N4AA-MU within the specified operating parameters. Selection between ATSAM4N8AA-MU and ATSAM4S4AA-MU depends on application requirements for processing speed, memory capacity, and peripheral connectivity.

Frequently Asked Questions (FAQ)

Q: Can ATSAM4N8AA-MU and ATSAM4S4AA-MU be used interchangeably with ATSAM3N4AA-MU?

A: Both parts are electrically and mechanically compatible substitutes. They share identical package form factor (48-QFN 7x7), I/O pin count (34), voltage supply range (1.62V ~ 3.6V), and operating temperature range (-40°C ~ 85°C). Functional differences exist in processing speed, memory capacity, and peripheral availability, which may require firmware or application adjustments.

Q: What are the key differences between ATSAM4N8AA-MU and ATSAM4S4AA-MU?

A: ATSAM4N8AA-MU operates at 100MHz with 512KB FLASH and 64K x 8 RAM. ATSAM4S4AA-MU operates at 120MHz with 256KB FLASH and 64K x 8 RAM. ATSAM4S4AA-MU includes additional connectivity options (USB, Memory Card, SSC) and higher resolution A/D conversion (8x12b vs. 9x10b). Both maintain identical package and I/O specifications.

Q: Are there any compliance or regulatory differences between these parts?

A: All three parts are ROHS3 compliant and REACH unaffected. Moisture sensitivity levels differ: ATSAM3N4AA-MU is MSL 1 (Unlimited), while ATSAM4N8AA-MU and ATSAM4S4AA-MU are MSL 3 (168 Hours). This affects storage and handling requirements but does not impact electrical performance or regulatory compliance.

Q: Why is ATSAM3N4AA-MU classified as obsolete?

A: Obsolete status indicates the part is no longer in active production. ATSAM4N8AA-MU and ATSAM4S4AA-MU are active products offering equivalent or enhanced functionality, making them suitable replacements for new designs and ongoing production.

Q: Do these substitute parts require PCB layout modifications?

A: No. All three parts use identical 48-QFN (7x7) package form factor with exposed pad and 34 I/O pins. PCB layouts designed for ATSAM3N4AA-MU are physically compatible with ATSAM4N8AA-MU and ATSAM4S4AA-MU without modification.