ATSAM3S1AA-MUR Equivalent & Substitute Parts

Part Overview

The ATSAM3S1AA-MUR is an ARM Cortex-M3 SAM3S microcontroller IC featuring 32-bit single-core architecture, 64MHz clock speed, and 64KB FLASH memory in a 48-QFN (7x7) surface mount package. This part is classified as obsolete, making identification of compatible substitutes essential for ongoing design support and production continuity. The SAM3S series provides integrated connectivity options including I2C, SPI, UART/USART, and USB, along with peripheral functions such as DMA, PWM, and watchdog timer capabilities.

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
Voltage Supply (Vcc/Vdd)	1.62V ~ 3.6V
Number of I/O	34
Mounting Type	Surface Mount
Package / Case	48-VFQFN Exposed Pad
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the ATSAM3S1AA-MUR is determined by strict equivalence across the following critical parameters:

Manufacturer & Series: Must be Microchip Technology SAM3S series
Core Architecture: ARM Cortex-M3, 32-bit single-core
Clock Speed: 64MHz
Memory Configuration: 64KB FLASH, 16KB RAM
Voltage Range: 1.62V ~ 3.6V
Package Type: 48-VFQFN Exposed Pad (48-QFN 7x7)
I/O Count: 34 pins
Connectivity & Peripherals: I2C, MMC, SPI, SSC, UART/USART, USB; Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT
Environmental Compliance: ROHS3 Compliant, MSL 3

The ATSAM3S1AB-MUR qualifies as a direct substitute based on identical electrical specifications, memory configuration, and package footprint. The primary distinction is product status and packaging format.

Parameter Comparison

Parameter	ATSAM3S1AA-MUR	ATSAM3S1AB-MUR
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
Voltage Supply (Vcc/Vdd)	1.62V ~ 3.6V	1.62V ~ 3.6V
Number of I/O	34	34
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
Data Converters	A/D 8x10/12b	A/D 8x10/12b
Oscillator Type	Internal	Internal
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	48-VFQFN Exposed Pad	48-VFQFN Exposed Pad
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active
Supplier Device Package	48-QFN (7x7)	48-QFN (7x7)
Packaging Format	Bulk	Tape & Reel (TR)

Engineering Selection Recommendations

The ATSAM3S1AB-MUR is the direct equivalent substitute for the ATSAM3S1AA-MUR. Both parts share identical electrical specifications, memory configuration, pin count, and package footprint. The ATSAM3S1AB-MUR carries active product status from Microchip Technology, ensuring continued availability and technical support. Both parts maintain ROHS3 compliance and equivalent environmental ratings.

The primary operational difference is packaging format: the ATSAM3S1AA-MUR is supplied in bulk packaging, while the ATSAM3S1AB-MUR is supplied in Tape & Reel (TR) format. This distinction affects handling, storage, and automated assembly processes but does not impact electrical or functional performance.

For new designs or production continuity, the ATSAM3S1AB-MUR is the recommended selection due to its active product status and standard industry packaging format.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts use the 48-VFQFN Exposed Pad package with identical pin assignments, voltage ratings, and I/O configurations. Direct PCB footprint compatibility is confirmed.

Q: What is the difference between bulk and Tape & Reel packaging?

A: Bulk packaging supplies components loose or in trays, suitable for manual assembly or small-volume production. Tape & Reel packaging supplies components on continuous carrier tape in reels, optimized for automated pick-and-place assembly equipment. Electrical and functional specifications remain identical.

Q: Can the ATSAM3S1AB-MUR replace the ATSAM3S1AA-MUR in existing designs?

A: Yes. Identical memory configuration (64KB FLASH, 16KB RAM), clock speed (64MHz), voltage supply range (1.62V ~ 3.6V), and peripheral set enable direct substitution without design modification.

Q: Why is the ATSAM3S1AA-MUR classified as obsolete?

A: Microchip Technology has transitioned this part to obsolete status. The ATSAM3S1AB-MUR remains in active production and is the recommended alternative for ongoing supply assurance.

Q: Are there any compliance differences between these parts?

A: No. Both parts maintain ROHS3 compliance, identical Moisture Sensitivity Level (MSL 3, 168 Hours), and equivalent environmental ratings across the -40°C ~ 85°C operating temperature range.

Q: What connectivity options are available on both parts?

A: Both the ATSAM3S1AA-MUR and ATSAM3S1AB-MUR support I2C, MMC, SPI, SSC, UART/USART, and USB connectivity, with integrated peripherals including DMA, PWM, watchdog timer, and brown-out detection.

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