ATSAM3S1BA-AU Equivalent & Substitute Parts

Part Overview

The ATSAM3S1BA-AU is an ARM Cortex-M3 SAM3S microcontroller IC manufactured by Microchip Technology, featuring 32-bit single-core architecture operating at 64MHz with 64KB FLASH memory and 16KB RAM. The device is packaged in a 64-LQFP (10x10) surface mount configuration and supports multiple connectivity interfaces including I2C, MMC, SPI, SSC, UART/USART, and USB.

The ATSAM3S1BA-AU carries an Obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this microcontroller platform.

Key Parameters

Parameter	Value
Core Processor	ARM Cortex-M3
Core Size	32-Bit Single-Core
Speed	64MHz
Program Memory Size	64KB (64K x 8)
Program Memory Type	FLASH
RAM Size	16K x 8
Voltage Supply (Vcc/Vdd)	1.62V ~ 3.6V
Number of I/O	47
Connectivity	I2C, MMC, SPI, SSC, UART/USART, USB
Data Converters	A/D 10x10/12b; D/A 2x12b
Peripherals	Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	64-LQFP (10x10)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the ATSAM3S1BA-AU is determined by strict equivalence across the following critical parameters:

Core Architecture: ARM Cortex-M3 processor
Memory Configuration: 64KB FLASH, 16KB RAM
Operating Frequency: 64MHz
I/O Count: 47 pins
Package Format: 64-LQFP (10x10) surface mount
Voltage Range: 1.62V ~ 3.6V
Connectivity Suite: I2C, MMC, SPI, SSC, UART/USART, USB
Peripheral Set: Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT
Data Conversion: A/D 10x10/12b; D/A 2x12b
Compliance: ROHS3, MSL 3

The ATSAM3S1BB-AU meets all specified electrical and mechanical parameters, maintaining functional and pin-level compatibility with the original ATSAM3S1BA-AU.

Parameter Comparison

Parameter	ATSAM3S1BA-AU	ATSAM3S1BB-AU	Match
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)	✓
Program Memory Type	FLASH	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	47	47	✓
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 10x10/12b; D/A 2x12b	A/D 10x10/12b; D/A 2x12b	✓
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	✓
Package / Case	64-LQFP (10x10)	64-LQFP (10x10)	✓
Mounting Type	Surface Mount	Surface Mount	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
MSL Rating	3 (168 Hours)	3 (168 Hours)	✓
Product Status	Obsolete	Active	Substitute Available

Engineering Selection Recommendations

The ATSAM3S1BB-AU is a direct functional equivalent to the ATSAM3S1BA-AU. Both devices share identical electrical specifications, memory configuration, peripheral set, and package format. The primary distinction is product lifecycle status: the ATSAM3S1BA-AU is classified as Obsolete, while the ATSAM3S1BB-AU maintains Active status with confirmed inventory availability (2800 units in stock versus 1310 units for the original part).

Both parts maintain ROHS3 compliance and identical MSL ratings, ensuring equivalent environmental and regulatory standing. The ATSAM3S1BB-AU is supplied in Tray packaging, supporting standard manufacturing and assembly workflows.

For applications currently utilizing the ATSAM3S1BA-AU, direct substitution with the ATSAM3S1BB-AU requires no design modifications, firmware changes, or PCB layout alterations. Pin assignments, electrical characteristics, and functional behavior remain identical across both part numbers.

Frequently Asked Questions (FAQ)

Q: Are the ATSAM3S1BA-AU and ATSAM3S1BB-AU pin-compatible?

A: Yes. Both devices utilize the 64-LQFP (10x10) package with 47 I/O pins in identical pin configurations. No PCB redesign is required for substitution.

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

A: The ATSAM3S1BA-AU is Obsolete; the ATSAM3S1BB-AU is Active. All electrical specifications, memory sizes, operating frequencies, connectivity interfaces, and peripheral functions are identical. The suffix change reflects product lifecycle management by Microchip Technology.

Q: Can firmware developed for the ATSAM3S1BA-AU run on the ATSAM3S1BB-AU without modification?

A: Yes. Identical core architecture, memory organization, and peripheral configuration ensure complete firmware compatibility. No recompilation or code changes are necessary.

Q: Are there any voltage or temperature rating differences?

A: No. Both parts operate across the identical voltage range (1.62V ~ 3.6V) and temperature range (-40°C ~ 85°C TA).

Q: What packaging differences exist between these parts?

A: The ATSAM3S1BA-AU is supplied in standard packaging; the ATSAM3S1BB-AU is supplied in Tray packaging. Both are surface mount 64-LQFP (10x10) configurations suitable for automated assembly.

Q: Are both parts ROHS3 compliant?

A: Yes. Both the ATSAM3S1BA-AU and ATSAM3S1BB-AU maintain ROHS3 compliance with identical MSL ratings of 3 (168 Hours).

Q: Which part should be selected for new designs?

A: The ATSAM3S1BB-AU should be selected for new designs due to its Active product status and confirmed supply availability. Existing designs using the ATSAM3S1BA-AU can transition to the ATSAM3S1BB-AU without design changes.

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