ATSAM3S1BA-MU Equivalent & Substitute Parts

Part Overview

The ATSAM3S1BA-MU is an ARM Cortex-M3 SAM3S microcontroller IC featuring 32-bit single-core architecture, 64MHz clock speed, and 64KB FLASH memory in a 64-QFN (9x9) surface mount package. This device is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. The SAM3S series provides integrated connectivity options including I2C, MMC, SPI, SSC, UART/USART, and USB interfaces, along with essential peripherals such as DMA, PWM, and watchdog timer functionality.

Substiute Parts

ATSAM3S1BA-MU

Microchip TechnologyIn Stock: 881ATSAM3S1BA-MU Datasheet

Current PartRFQ

ATSAM3S1BB-MU

Microchip TechnologyIn Stock: 2220ATSAM3S1BB-MU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The ATSAM3S1BB-MU qualifies as a direct substitute for the ATSAM3S1BA-MU based on identical electrical and mechanical parameters. Substitution is valid when the following criteria are met:

• Identical core processor architecture (ARM Cortex-M3)
• Matching core size and speed (32-Bit Single-Core, 64MHz)
• Identical program memory capacity (64KB FLASH)
• Identical RAM configuration (16K x 8)
• Matching voltage supply range (1.62V ~ 3.6V)
• Identical I/O count (47 pins)
• Identical connectivity interfaces (I2C, MMC, SPI, SSC, UART/USART, USB)
• Identical peripheral set (Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT)
• Matching data converter specifications (A/D 10x10/12b; D/A 2x12b)
• Identical package form factor (64-QFN 9x9)
• Identical operating temperature range (-40°C ~ 85°C)

Parameter Comparison

Engineering Selection Recommendations

The ATSAM3S1BB-MU is a direct functional equivalent to the ATSAM3S1BA-MU. Both devices share identical electrical specifications, memory configurations, peripheral sets, and package form factors. The primary distinction is product status: the ATSAM3S1BA-MU is obsolete, while the ATSAM3S1BB-MU maintains active production status.

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying equivalent regulatory requirements. The ATSAM3S1BB-MU is supplied in Tray packaging with MSL 3 (168 Hours) moisture sensitivity, compared to the original part's MSL 1 (Unlimited) rating. This difference reflects standard industry packaging variations and does not affect functional compatibility in applications where standard moisture control procedures are observed.

For new designs or production continuity where the ATSAM3S1BA-MU is unavailable, the ATSAM3S1BB-MU provides complete electrical and mechanical interchangeability.

Frequently Asked Questions (FAQ)

Q: Can the ATSAM3S1BB-MU directly replace the ATSAM3S1BA-MU in existing designs?

A: Yes. Both parts are identical in core processor, memory capacity, speed, I/O configuration, connectivity interfaces, and package form factor. No design modifications are required for functional substitution.

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

A: The ATSAM3S1BA-MU is obsolete, while the ATSAM3S1BB-MU is in active production. The suffix letter change reflects Microchip's product lifecycle management. Electrical and mechanical specifications remain identical.

Q: Are there packaging differences between these parts?

A: The ATSAM3S1BA-MU packaging is not specified in available documentation. The ATSAM3S1BB-MU is supplied in Tray packaging. Both use the 64-QFN (9x9) form factor with identical pin configuration and exposed pad design.

Q: What is the significance of the different MSL ratings?

A: The ATSAM3S1BA-MU has MSL 1 (Unlimited moisture sensitivity), while the ATSAM3S1BB-MU has MSL 3 (168 Hours). MSL 3 requires standard moisture control during storage and handling. This is a typical industry variation and does not affect device performance when standard moisture management procedures are followed.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the ATSAM3S1BA-MU and ATSAM3S1BB-MU are ROHS3 compliant and REACH unaffected, meeting equivalent environmental and regulatory standards.

Q: What is the operating temperature range for both parts?

A: Both parts operate across -40°C to 85°C (TA), providing identical thermal performance specifications.