ATSAM3S1AA-AUR Equivalent & Substitute Parts

Part Overview

The ATSAM3S1AA-AUR is an ARM Cortex-M3 SAM3S microcontroller IC manufactured by Microchip Technology. This 32-bit single-core device operates at 64MHz with 64KB FLASH memory and 16KB RAM, housed in a 48-LQFP (7x7) surface mount package. The part is currently listed as obsolete, making identification of suitable 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) FLASH
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-AUR is determined by strict equivalence across the following critical parameters:

ARM Cortex-M3 core processor architecture
32-bit single-core configuration
64MHz operating frequency
64KB FLASH program memory capacity
16KB RAM capacity
34 I/O pins
Supply voltage range 1.62V ~ 3.6V
Identical peripheral set: Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT
Connectivity support: I2C, MMC, SPI, SSC, UART/USART, USB
A/D converter configuration: 8x10/12b
48-LQFP (7x7) surface mount package
ROHS3 compliance
MSL 3 rating

The ATSAM3S1AB-AUR meets all these criteria and qualifies as a direct substitute.

Parameter Comparison

Parameter	ATSAM3S1AA-AUR	ATSAM3S1AB-AUR
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) FLASH	64KB (64K x 8) FLASH
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 Option	Not specified	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

The ATSAM3S1AB-AUR is the direct substitute for the ATSAM3S1AA-AUR. Both parts are electrically and mechanically identical across all specified parameters. The primary distinction is product status: the ATSAM3S1AA-AUR is obsolete, while the ATSAM3S1AB-AUR maintains active status with significantly higher inventory availability (1,000,399 units versus 709 units).

Both parts carry ROHS3 compliance and identical MSL 3 ratings, ensuring equivalent environmental and regulatory compliance. The ATSAM3S1AB-AUR is available in standard packaging formats (Cut Tape and Digi-Reel), supporting both prototype and production workflows.

For new designs or production continuity, the ATSAM3S1AB-AUR is the appropriate selection due to active product status and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Are the ATSAM3S1AA-AUR and ATSAM3S1AB-AUR pin-compatible?

A: Yes. Both parts use the 48-LQFP (7x7) package with identical pin assignments, I/O configuration (34 pins), and electrical characteristics. Direct PCB substitution is supported without layout modifications.

Q: What is the difference between these two part numbers?

A: The parts are functionally and electrically identical. The difference is product lifecycle status: ATSAM3S1AA-AUR is obsolete, while ATSAM3S1AB-AUR is active. The ATSAM3S1AB-AUR also offers standard packaging options (Cut Tape and Digi-Reel) for improved supply chain accessibility.

Q: Can I use the ATSAM3S1AB-AUR as a drop-in replacement?

A: Yes. The ATSAM3S1AB-AUR is a direct substitute. All electrical parameters, memory configuration, peripheral set, connectivity options, and package specifications are identical. No firmware, schematic, or PCB modifications are required.

Q: Are both parts RoHS compliant?

A: Yes. Both the ATSAM3S1AA-AUR and ATSAM3S1AB-AUR are ROHS3 compliant and carry MSL 3 moisture sensitivity ratings.

Q: Why should I transition from ATSAM3S1AA-AUR to ATSAM3S1AB-AUR?

A: The ATSAM3S1AA-AUR is obsolete with limited remaining inventory (709 units). The ATSAM3S1AB-AUR is actively manufactured with robust supply availability (1,000,399 units), ensuring long-term design support and production continuity.

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