ATSAM4CMS8CB-AUR Equivalent & Substitute Parts

Part Overview

The ATSAM4CMS8CB-AUR is a 32-bit dual-core ARM Cortex-M4/M4F microcontroller from Microchip Technology's SAM4CM series, featuring 512KB FLASH memory, 128KB RAM, and operation at 120MHz. This device is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The substitute part maintains identical core functionality, electrical specifications, and mechanical compatibility while offering active product status.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Series	SAM4CM
Core Processor	ARM Cortex-M4/M4F
Core Size	32-Bit Dual-Core
Speed	120MHz
Program Memory Size	512KB (512K x 8) FLASH
RAM Size	128K x 8
Voltage Supply (Vcc/Vdd)	1.62V ~ 3.6V
Number of I/O	57
Package Type	100-LQFP (14x14)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the ATSAM4CMS8CB-AUR is based on strict equivalence across the following critical parameters:

Processor Architecture: ARM Cortex-M4/M4F dual-core configuration
Memory Configuration: 512KB FLASH and 128KB RAM
Operating Frequency: 120MHz
Supply Voltage Range: 1.62V ~ 3.6V
Package Format: 100-LQFP (14x14) surface mount
Peripheral Set: EBI/EMI, I2C, IrDA, SPI, UART/USART, DMA, LCD, PWM, WDT, Brown-out Detect/Reset, POR
I/O Count: 57 pins
Environmental Compliance: ROHS3 Compliant, REACH Unaffected

The substitute part ATSAM4CMS8CC-AUR meets all electrical and mechanical requirements for direct replacement. The primary distinction is packaging format (Digi-Reel vs. Tape & Reel) and product lifecycle status.

Parameter Comparison

Parameter	ATSAM4CMS8CB-AUR	ATSAM4CMS8CC-AUR	Match
Manufacturer	Microchip Technology	Microchip Technology	✓
Series	SAM4CM	SAM4CM	✓
Core Processor	ARM Cortex-M4/M4F	ARM Cortex-M4/M4F	✓
Core Size	32-Bit Dual-Core	32-Bit Dual-Core	✓
Speed	120MHz	120MHz	✓
Program Memory Size	512KB (512K x 8) FLASH	512KB (512K x 8) FLASH	✓
RAM Size	128K x 8	128K x 8	✓
Voltage Supply (Vcc/Vdd)	1.62V ~ 3.6V	1.62V ~ 3.6V	✓
Number of I/O	57	57	✓
Data Converters	A/D 6x10b	A/D 6x10b	✓
Connectivity	EBI/EMI, I2C, IrDA, SPI, UART/USART	EBI/EMI, I2C, IrDA, SPI, UART/USART	✓
Peripherals	Brown-out Detect/Reset, DMA, LCD, POR, PWM, WDT	Brown-out Detect/Reset, DMA, LCD, POR, PWM, WDT	✓
Package Type	100-LQFP (14x14)	100-LQFP (14x14)	✓
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	3 (168 Hours)	3 (168 Hours)	✓
Product Status	Obsolete	Active	Substitute is Active
Packaging Format	Digi-Reel®	Tape & Reel (TR)	Different Format

Engineering Selection Recommendations

The ATSAM4CMS8CC-AUR is the direct functional equivalent of the ATSAM4CMS8CB-AUR. Selection of the substitute part is justified on the following basis:

Product Lifecycle: The ATSAM4CMS8CB-AUR is classified as obsolete. The ATSAM4CMS8CC-AUR maintains active product status, ensuring continued availability and manufacturer support.
Electrical Equivalence: All electrical parameters, memory configuration, processing capability, and peripheral functionality are identical.
Mechanical Compatibility: Both parts utilize the 100-LQFP (14x14) package format with identical pin assignments and surface mount characteristics, enabling direct PCB-level substitution.
Compliance Alignment: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent applications.
Packaging Consideration: The substitute part is supplied in Tape & Reel format, which is standard for production environments. Digi-Reel packaging of the original part is no longer available due to obsolescence.

Frequently Asked Questions (FAQ)

Q: Can ATSAM4CMS8CC-AUR be used as a direct replacement for ATSAM4CMS8CB-AUR in existing designs?

A: Yes. The parts are electrically and mechanically identical. Pin configuration, memory capacity, processing speed, voltage requirements, and peripheral functionality are equivalent. PCB layout and firmware require no modification.

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

A: Both are surface mount packaging formats for automated assembly. Digi-Reel is a proprietary format; Tape & Reel is the industry standard. The difference is in packaging presentation only; the microcontroller itself is identical.

Q: Are there any firmware compatibility issues between these parts?

A: No. Both parts implement the same ARM Cortex-M4/M4F architecture, instruction set, and peripheral register map. Firmware compiled for the ATSAM4CMS8CB-AUR executes without modification on the ATSAM4CMS8CC-AUR.

Q: Why is the original part marked as obsolete?

A: Product obsolescence is determined by the manufacturer based on market demand and production lifecycle. The ATSAM4CMS8CC-AUR remains in active production, providing continued support for this microcontroller family.

Q: Are the operating temperature ranges identical?

A: Yes. Both parts operate across the -40°C to 85°C temperature range, maintaining identical thermal specifications for industrial and commercial applications.

Q: What is the moisture sensitivity level, and does it differ between parts?

A: Both parts have MSL 3 (168 Hours), indicating identical moisture sensitivity. Storage and handling requirements are the same for both variants.

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