ATSAM3N4BA-AU Equivalent & Substitute Parts

Part Overview

The ATSAM3N4BA-AU is an ARM Cortex-M3 SAM3N microcontroller IC featuring 32-bit single-core architecture, 48MHz clock speed, 256KB FLASH memory, and 64-LQFP packaging. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts are selected based on compatible electrical specifications, identical packaging footprint, and functional equivalence within the SAM microcontroller family.

Key Parameters

Parameter	Value
Core Processor	ARM Cortex-M3
Core Size	32-Bit Single-Core
Clock Speed	48MHz
Program Memory	256KB FLASH
RAM Size	24K x 8
Supply Voltage	1.62V ~ 3.6V
Package Type	64-LQFP (10x10)
I/O Count	47
Operating Temperature	-40°C ~ 85°C
Connectivity	I2C, IrDA, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, DMA, POR, PWM, WDT
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the ATSAM3N4BA-AU are grouped based on the following substitution criteria:

Direct Substitutes (64-LQFP Package Compatibility):

ATSAM4N8BA-AU and ATSAM4S4BA-AU maintain identical 64-LQFP (10x10) packaging, 47 I/O pins, and supply voltage range (1.62V ~ 3.6V). These parts are pin-compatible and represent functional upgrades within the SAM4 family, offering enhanced processing capability (ARM Cortex-M4), increased memory capacity, and higher clock speeds while preserving the same physical footprint and electrical interface.

Manufacturer Recommended Substitute (Package Variant):

ATSAM4LS4AA-MU is the manufacturer-recommended alternative, featuring ARM Cortex-M4 architecture and identical 256KB FLASH memory capacity. This part uses 48-QFN (7x7) packaging with 32 I/O pins, representing a footprint reduction suitable for space-constrained applications. Supply voltage compatibility (1.68V ~ 3.6V) and operating temperature range (-40°C ~ 85°C) align with the original specification.

Parameter Comparison

Parameter	ATSAM3N4BA-AU	ATSAM4N8BA-AU	ATSAM4S4BA-AU	ATSAM4LS4AA-MU
Core Processor	ARM Cortex-M3	ARM Cortex-M4	ARM Cortex-M4	ARM Cortex-M4
Clock Speed	48MHz	100MHz	120MHz	48MHz
Program Memory	256KB FLASH	512KB FLASH	256KB FLASH	256KB FLASH
RAM Size	24K x 8	64K x 8	64K x 8	32K x 8
Supply Voltage	1.62V ~ 3.6V	1.62V ~ 3.6V	1.62V ~ 3.6V	1.68V ~ 3.6V
Package Type	64-LQFP (10x10)	64-LQFP (10x10)	64-LQFP (10x10)	48-QFN (7x7)
I/O Count	47	47	47	32
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Connectivity	I2C, IrDA, SPI, UART/USART	I2C, IrDA, SPI, UART/USART	I2C, IrDA, Memory Card, SPI, SSC, UART/USART, USB	I2C, IrDA, LINbus, SPI, UART/USART, USB
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Pin-Compatible Replacement (64-LQFP Footprint): Select ATSAM4N8BA-AU or ATSAM4S4BA-AU when PCB layout and I/O pin assignments must remain unchanged. Both parts maintain the 64-LQFP (10x10) package with 47 I/O pins and identical supply voltage specifications. ATSAM4S4BA-AU provides additional connectivity options (USB, Memory Card, SSC) compared to ATSAM4N8BA-AU, making it suitable for applications requiring expanded peripheral support. Both parts are active products with ROHS3 compliance.

For Space-Optimized Design (Footprint Reduction): Select ATSAM4LS4AA-MU when board space constraints permit package migration from 64-LQFP to 48-QFN. This manufacturer-recommended substitute reduces I/O count to 32 pins and footprint to 7x7mm. Verify that application requirements do not exceed 32 I/O pins before selection. Supply voltage minimum increases to 1.68V; confirm compatibility with power supply design. This part is an active product with ROHS3 compliance.

For Maximum Performance Upgrade: ATSAM4S4BA-AU offers the highest clock speed (120MHz) and enhanced data converter specifications (11x12-bit A/D, 2x12-bit D/A) while maintaining 256KB FLASH memory and 64-LQFP packaging. This selection is appropriate when performance headroom and expanded peripheral capability are design priorities.

Frequently Asked Questions (FAQ)

Q: Can ATSAM4N8BA-AU and ATSAM4S4BA-AU be used interchangeably with ATSAM3N4BA-AU? A: Both parts are pin-compatible replacements with identical 64-LQFP (10x10) packaging and 47 I/O pins. However, firmware recompilation is required due to architectural differences (ARM Cortex-M3 to ARM Cortex-M4). Verify that application code is compatible with the SAM4 instruction set before deployment.

Q: What are the key differences between ATSAM4N8BA-AU and ATSAM4S4BA-AU? A: ATSAM4N8BA-AU operates at 100MHz with 512KB FLASH and basic connectivity (I2C, IrDA, SPI, UART/USART). ATSAM4S4BA-AU operates at 120MHz with 256KB FLASH and extended connectivity including USB, Memory Card, and SSC interfaces. Select based on clock speed requirements and peripheral needs.

Q: Is ATSAM4LS4AA-MU suitable for applications requiring 47 I/O pins? A: No. ATSAM4LS4AA-MU provides only 32 I/O pins in a 48-QFN package. This part is suitable only for applications that can operate with reduced I/O count. If all 47 pins are required, select ATSAM4N8BA-AU or ATSAM4S4BA-AU.

Q: Are all substitute parts ROHS3 compliant? A: Yes. ATSAM3N4BA-AU, ATSAM4N8BA-AU, ATSAM4S4BA-AU, and ATSAM4LS4AA-MU are all ROHS3 compliant with identical Moisture Sensitivity Level (MSL 3, 168 Hours).

Q: What is the minimum supply voltage for ATSAM4LS4AA-MU? A: The minimum supply voltage for ATSAM4LS4AA-MU is 1.68V, compared to 1.62V for other parts. Verify that power supply design can maintain this minimum voltage before selecting this part.

Q: Can firmware developed for ATSAM3N4BA-AU run on substitute parts without modification? A: Firmware requires recompilation and validation. While the SAM3N and SAM4 families share common peripherals and instruction set compatibility, architectural enhancements in the ARM Cortex-M4 and differences in memory configuration necessitate testing and potential code adjustments.

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