ATSAM3S1AA-AU Equivalent & Substitute Parts

Part Overview

The ATSAM3S1AA-AU is an ARM Cortex-M3 SAM3S microcontroller IC manufactured by Microchip Technology, featuring 32-bit single-core architecture, 64MHz clock speed, and 64KB FLASH memory in a 48-LQFP (7x7) surface mount package. The part is currently classified as obsolete, making identification of compatible substitute components essential for ongoing design support, production continuity, and system maintenance.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Series	SAM3S
Core Processor	ARM Cortex-M3
Core Size	32-Bit Single-Core
Speed	64MHz
Program Memory Size	64KB (64K x 8)
RAM Size	16K x 8
Number of I/O	34
Voltage Supply (Vcc/Vdd)	1.62V ~ 3.6V
Data Converters	A/D 8x10/12b
Connectivity	I2C, MMC, SPI, SSC, UART/USART, USB
Peripherals	Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT
Package / Case	48-LQFP (7x7)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the ATSAM3S1AA-AU is determined by strict equivalence across the following critical parameters:

Processor Architecture: ARM Cortex-M3 core
Memory Configuration: 64KB FLASH, 16K x 8 RAM
Clock Speed: 64MHz
I/O Count: 34 pins
Package Format: 48-LQFP (7x7) surface mount
Voltage Range: 1.62V ~ 3.6V
Connectivity Interfaces: I2C, MMC, SPI, SSC, UART/USART, USB
Peripheral Set: Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT
Data Conversion: A/D 8x10/12b
Compliance: ROHS3, MSL 3

The ATSAM3S1AB-AU meets all these criteria and is classified as a direct substitute.

Parameter Comparison

Parameter	ATSAM3S1AA-AU	ATSAM3S1AB-AU
Manufacturer	Microchip Technology	Microchip Technology
Series	SAM3S	SAM3S
Core Processor	ARM Cortex-M3	ARM Cortex-M3
Core Size	32-Bit Single-Core	32-Bit Single-Core
Speed	64MHz	64MHz
Program Memory Size	64KB (64K x 8)	64KB (64K x 8)
RAM Size	16K x 8	16K x 8
Number of I/O	34	34
Voltage Supply (Vcc/Vdd)	1.62V ~ 3.6V	1.62V ~ 3.6V
Data Converters	A/D 8x10/12b	A/D 8x10/12b
Connectivity	I2C, MMC, SPI, SSC, UART/USART, USB	I2C, MMC, SPI, SSC, UART/USART, USB
Peripherals	Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT	Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT
Package / Case	48-LQFP (7x7)	48-LQFP (7x7)
Mounting Type	Surface Mount	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active
Packaging	Tube	Tray

Engineering Selection Recommendations

The ATSAM3S1AB-AU is the direct functional equivalent of the ATSAM3S1AA-AU. Both parts share identical electrical specifications, memory configuration, peripheral set, and package format. The primary distinction is product lifecycle status: the ATSAM3S1AA-AU is obsolete, while the ATSAM3S1AB-AU maintains active production status with Microchip Technology.

Both parts maintain ROHS3 compliance and identical MSL ratings, ensuring compatibility with current manufacturing and environmental standards. The ATSAM3S1AB-AU is available in higher inventory quantities (3000 Pcs) compared to the ATSAM3S1AA-AU (1320 Pcs), supporting production continuity and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the ATSAM3S1AB-AU be used as a direct replacement for the ATSAM3S1AA-AU?

A: Yes. The ATSAM3S1AB-AU is electrically and mechanically identical to the ATSAM3S1AA-AU. All functional parameters, memory specifications, I/O configuration, and peripheral sets are equivalent. No design modifications are required.

Q: Are there differences in packaging between these parts?

A: The ATSAM3S1AA-AU is supplied in tube packaging, while the ATSAM3S1AB-AU is supplied in tray packaging. Both use the same 48-LQFP (7x7) physical package format. Tray packaging is standard for active production parts and does not affect component functionality or PCB assembly compatibility.

Q: What is the significance of the product status difference?

A: The ATSAM3S1AA-AU is classified as obsolete, indicating Microchip Technology has discontinued active production. The ATSAM3S1AB-AU maintains active status with ongoing manufacturing support. For new designs or production continuity, the ATSAM3S1AB-AU is the recommended selection.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the ATSAM3S1AA-AU and ATSAM3S1AB-AU are ROHS3 compliant with identical MSL 3 ratings (168 Hours). They meet the same environmental and regulatory requirements.

Q: Are there any electrical parameter differences between these parts?

A: No. Both parts feature identical core processor architecture, clock speed (64MHz), memory configuration (64KB FLASH, 16K x 8 RAM), voltage supply range (1.62V ~ 3.6V), I/O count (34), connectivity interfaces, and peripheral sets.

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