ATSAM4CMS16CB-AU Equivalent & Substitute Parts

Part Overview

The ATSAM4CMS16CB-AU is a 32-bit dual-core ARM Cortex-M4/M4F microcontroller from Microchip Technology's SAM4CM series, featuring 1MB FLASH memory, 128KB RAM, and 120MHz operation. This device is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. The ATSAM4CMS16CC-AU serves as a direct functional equivalent with identical electrical and mechanical specifications.

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	1MB (1M x 8) FLASH
RAM Size	128K x 8
Voltage Supply (Vcc/Vdd)	1.62V ~ 3.6V
Number of I/O	57
Package / Case	100-LQFP (14x14)
Mounting Type	Surface Mount
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 ATSAM4CMS16CB-AU is determined by strict equivalence across the following parameters:

Core processor architecture and instruction set (ARM Cortex-M4/M4F)
Memory configuration (1MB FLASH, 128KB RAM)
Operating frequency (120MHz)
Supply voltage range (1.62V ~ 3.6V)
I/O pin count and configuration (57 I/O)
Package type and pinout (100-LQFP, 14x14mm)
Peripheral set (EBI/EMI, I2C, IrDA, SPI, UART/USART, DMA, LCD, PWM, WDT, Brown-out Detect/Reset, POR, A/D 6x10b)
Environmental compliance (ROHS3, REACH Unaffected)
Moisture sensitivity classification (MSL 3)

The ATSAM4CMS16CC-AU meets all substitution criteria as a direct equivalent within the SAM4CM microcontroller family.

Parameter Comparison

Parameter	ATSAM4CMS16CB-AU (Main)	ATSAM4CMS16CC-AU (Substitute)
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	1MB (1M x 8) FLASH	1MB (1M 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
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
Data Converters	A/D 6x10b	A/D 6x10b
Package / Case	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 (MSL)	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The ATSAM4CMS16CC-AU is the appropriate substitute for the obsolete ATSAM4CMS16CB-AU. Both devices are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The substitute part maintains active product status with Microchip Technology, ensuring continued availability and manufacturing support. All electrical characteristics, memory configuration, peripheral functionality, and package specifications are identical, enabling direct replacement without design modification. The substitute part is currently in stock with significantly higher inventory availability (19,644 units versus 929 units for the main part).

Frequently Asked Questions (FAQ)

Q: Are the ATSAM4CMS16CB-AU and ATSAM4CMS16CC-AU pin-compatible?

A: Yes. Both devices use the 100-LQFP (14x14mm) package with identical pinout and 57 I/O pins. No PCB layout changes are required.

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

A: The primary difference is product status. The ATSAM4CMS16CB-AU is obsolete, while the ATSAM4CMS16CC-AU is active. All functional and electrical specifications are identical.

Q: Can I use the ATSAM4CMS16CC-AU as a direct drop-in replacement?

A: Yes. The substitute part is electrically and mechanically equivalent. No firmware, software, or hardware modifications are necessary.

Q: Are both parts compliant with current environmental standards?

A: Yes. Both the ATSAM4CMS16CB-AU and ATSAM4CMS16CC-AU are ROHS3 compliant and REACH unaffected.

Q: What is the moisture sensitivity level for these microcontrollers?

A: Both parts have MSL 3 classification with a 168-hour floor life rating. Standard moisture control procedures during storage and handling apply.

Q: Which part should I specify for new designs?

A: Specify the ATSAM4CMS16CC-AU for new designs. This part has active product status and confirmed availability.

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