ATSAM4CMS8CB-AU Equivalent & Substitute Parts

Part Overview

The ATSAM4CMS8CB-AU is a 32-bit dual-core ARM Cortex-M4/M4F microcontroller from Microchip Technology's SAM4CM series, featuring 512KB FLASH memory, 128KB RAM, and 120MHz operation. This device is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The SAM4CM architecture supports embedded systems requiring high-performance processing with integrated connectivity interfaces including SPI, UART/USART, I2C, and IrDA protocols.

Substiute Parts

ATSAM4CMS8CB-AU

Microchip TechnologyIn Stock: 894ATSAM4CMS8CB-AU Datasheet

Current PartRFQ

ATSAM4CMS8CC-AU

Microchip TechnologyIn Stock: 4545ATSAM4CMS8CC-AU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ATSAM4CMS8CB-AU is determined by strict equivalence across the following critical parameters:

• Manufacturer and series match (Microchip Technology SAM4CM)
• Identical core processor architecture (ARM Cortex-M4/M4F)
• Matching core size and speed (32-Bit Dual-Core, 120MHz)
• Equivalent memory configuration (512KB FLASH, 128KB RAM)
• Identical package and pinout (100-LQFP 14x14)
• Compatible voltage supply range (1.62V ~ 3.6V)
• Matching connectivity interfaces (EBI/EMI, I2C, IrDA, SPI, UART/USART)
• Identical peripheral set (Brown-out Detect/Reset, DMA, LCD, POR, PWM, WDT)
• Equivalent I/O count (57 pins)
• Matching compliance certifications (ROHS3, REACH Unaffected)

The ATSAM4CMS8CC-AU qualifies as a direct substitute based on full parameter alignment across all electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The ATSAM4CMS8CC-AU is a direct functional equivalent to the ATSAM4CMS8CB-AU. Both devices share identical electrical specifications, memory configuration, peripheral set, and package geometry. The primary distinction is product lifecycle status: the ATSAM4CMS8CB-AU is obsolete while the ATSAM4CMS8CC-AU maintains active production status.

For new designs and production continuity, the ATSAM4CMS8CC-AU is the appropriate selection. Both parts maintain equivalent ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment. The substitute part is available in higher inventory quantities (4512 units versus 830 units), supporting sustained manufacturing requirements.

Frequently Asked Questions (FAQ)

Q: Are the ATSAM4CMS8CB-AU and ATSAM4CMS8CC-AU pin-compatible?

A: Yes. Both devices use the 100-LQFP (14x14) package with identical pinout and 57 I/O pins. Direct PCB substitution is supported without layout modifications.

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

A: The devices are electrically and functionally identical. The difference is product status: ATSAM4CMS8CB-AU is obsolete, while ATSAM4CMS8CC-AU is in active production. The suffix variation (-CB versus -CC) reflects packaging or manufacturing batch designation.

Q: Can I use ATSAM4CMS8CC-AU in place of ATSAM4CMS8CB-AU in existing designs?

A: Yes. The substitute part maintains full compatibility across all specified electrical parameters, memory configuration, peripheral functionality, and package specifications. No firmware or hardware modifications are required.

Q: Are there any compliance or certification differences?

A: No. Both parts maintain identical ROHS3 compliance, REACH unaffected status, and MSL 3 moisture sensitivity rating. Regulatory requirements are equivalent.

Q: What is the inventory status of the substitute part?

A: The ATSAM4CMS8CC-AU is available in active production with 4512 units in stock, compared to 830 units for the obsolete ATSAM4CMS8CB-AU.