ATSAM3N2AA-MU Equivalent & Substitute Parts

Part Overview

The ATSAM3N2AA-MU is an ARM Cortex-M3 SAM3N microcontroller IC featuring 32-bit single-core architecture, 48MHz clock speed, 128KB FLASH memory, and 16KB RAM in a 48-QFN (7x7) surface mount package. This device is classified as obsolete product status. Identifying equivalent and substitute parts is necessary to support legacy system maintenance, design updates, and supply chain continuity when original inventory becomes unavailable.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Core Processor	ARM Cortex-M3
Core Size	32-Bit Single-Core
Speed	48MHz
Program Memory Size	128KB (128K x 8) FLASH
RAM Size	16K x 8
Number of I/O	34
Voltage Supply (Vcc/Vdd)	1.62V ~ 3.6V
Data Converters	A/D 8x10b
Connectivity	I2C, IrDA, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, DMA, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package	48-VFQFN Exposed Pad (7x7)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the ATSAM3N2AA-MU are identified based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Identical package format: 48-QFN (7x7) with exposed pad
Identical pin count: 34 I/O pins
Identical voltage supply range: 1.62V ~ 3.6V
Identical mounting type: Surface mount
Identical operating temperature range: -40°C ~ 85°C
Compatible connectivity interfaces: I2C, SPI, UART/USART
Compatible peripheral set: DMA, PWM, WDT, Brown-out Detect/Reset, POR

Secondary Compatibility Considerations:

Program memory size: 128KB minimum
RAM size: 16KB minimum
Core architecture: 32-bit single-core ARM-based processors

The substitute parts listed below meet all primary compatibility criteria and maintain backward compatibility with existing designs while offering enhanced performance characteristics or improved product status.

Parameter Comparison

Parameter	ATSAM3N2AA-MU	ATSAM4N8AA-MU	ATSAM4S2AA-MU	MKL25Z128VFT4
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	NXP USA Inc.
Core Processor	ARM Cortex-M3	ARM Cortex-M4	ARM Cortex-M4	ARM Cortex-M0+
Speed	48MHz	100MHz	120MHz	48MHz
Program Memory Size	128KB	512KB	128KB	128KB
RAM Size	16K x 8	64K x 8	64K x 8	16K x 8
Number of I/O	34	34	34	36
Voltage Supply (Vcc/Vdd)	1.62V ~ 3.6V	1.62V ~ 3.6V	1.62V ~ 3.6V	1.71V ~ 3.6V
Data Converters	A/D 8x10b	A/D 9x10b	A/D 8x12b	A/D 13x16b, D/A 1x12b
Connectivity	I2C, IrDA, SPI, UART/USART	I2C, IrDA, SPI, UART/USART	I2C, IrDA, Memory Card, SPI, SSC, UART/USART, USB	I2C, LINbus, SPI, UART/USART, USB, USB OTG
Peripherals	Brown-out Detect/Reset, DMA, POR, PWM, WDT	Brown-out Detect/Reset, DMA, POR, PWM, WDT	Brown-out Detect/Reset, DMA, POR, PWM, WDT	Brown-out Detect/Reset, DMA, LVD, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 105°C
Package	48-VFQFN Exposed Pad	48-VFQFN Exposed Pad	48-VFQFN Exposed Pad	48-VFQFN Exposed Pad
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

ATSAM4N8AA-MU is a direct Microchip Technology substitute within the SAM4N series. This part maintains identical pin configuration, package format, and voltage supply range. It offers enhanced performance with ARM Cortex-M4 core architecture, 100MHz clock speed, and 512KB FLASH memory. Product status is active with ROHS3 compliance and REACH unaffected certification. Selection of this part is appropriate for designs requiring higher processing capability while maintaining the same physical footprint and electrical interface.

ATSAM4S2AA-MU is a Microchip Technology substitute within the SAM4S series. This part maintains identical pin configuration, package format, and voltage supply range. It provides ARM Cortex-M4 core architecture, 120MHz clock speed, and enhanced connectivity including USB support. Program memory matches the original specification at 128KB. Product status is active with ROHS3 compliance and REACH unaffected certification. Selection of this part is appropriate for designs requiring USB connectivity and higher clock speed performance.

MKL25Z128VFT4 is a manufacturer-recommended substitute from NXP USA Inc. within the Kinetis KL2 series. This part maintains identical package format and pin count with compatible voltage supply range. It features ARM Cortex-M0+ core architecture, 48MHz clock speed matching the original, and 128KB FLASH memory. Enhanced data converter capabilities include 13-channel 16-bit A/D and 1-channel 12-bit D/A. Extended operating temperature range to 105°C and additional connectivity options including USB OTG are provided. Product status is active with ROHS3 compliance and REACH unaffected certification. Selection of this part is appropriate for designs requiring cross-manufacturer compatibility and enhanced analog conversion capabilities.

Frequently Asked Questions (FAQ)

Q: Can ATSAM4N8AA-MU be used as a direct replacement for ATSAM3N2AA-MU?

A: ATSAM4N8AA-MU is electrically and mechanically compatible with identical package, pin count, and voltage supply specifications. The primary difference is enhanced performance with higher clock speed (100MHz vs 48MHz) and increased FLASH memory (512KB vs 128KB). Existing firmware may require recompilation but will function without hardware modifications.

Q: What are the key differences between ATSAM4S2AA-MU and ATSAM4N8AA-MU?

A: Both parts share identical package and pin configuration. ATSAM4S2AA-MU operates at 120MHz with 128KB FLASH and includes USB connectivity. ATSAM4N8AA-MU operates at 100MHz with 512KB FLASH without USB support. Selection depends on application requirements for clock speed, memory capacity, and USB functionality.

Q: Is MKL25Z128VFT4 from a different manufacturer compatible?

A: MKL25Z128VFT4 from NXP USA Inc. maintains identical package format, pin count, and voltage supply range. Core architecture differs (ARM Cortex-M0+ vs Cortex-M3), requiring firmware validation and potential code modifications. Enhanced analog conversion capabilities and extended temperature range are provided. Cross-manufacturer substitution requires design review and testing.

Q: What is the impact of different moisture sensitivity levels?

A: ATSAM3N2AA-MU has MSL 1 (unlimited shelf life). Substitute parts have MSL 3 (168-hour limit after moisture exposure). This affects storage and handling procedures. Parts with MSL 3 require baking before reflow if exposed to humidity for extended periods. Manufacturing processes must account for reduced shelf life windows.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the original ATSAM3N2AA-MU specifications. Compliance certifications are maintained across all alternatives.

Q: Which substitute part offers the best performance upgrade?

A: ATSAM4S2AA-MU provides the highest clock speed at 120MHz with USB connectivity support. ATSAM4N8AA-MU offers the largest FLASH memory at 512KB. Selection depends on specific application performance and feature requirements.

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