ATSAM3U1CA-AU Equivalent & Substitute Parts

Part Overview

The ATSAM3U1CA-AU is an ARM Cortex-M3 SAM3U microcontroller IC manufactured by Microchip Technology, featuring 32-bit single-core architecture operating at 96MHz with 64KB FLASH memory and 20KB RAM. This device is classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Series	SAM3U
Core Processor	ARM Cortex-M3
Core Size	32-Bit Single-Core
Speed	96MHz
Program Memory Size	64KB (64K x 8)
Program Memory Type	FLASH
RAM Size	20K x 8
Voltage Supply (Vcc/Vdd)	1.62V ~ 3.6V
Data Converters	A/D 4x10b, 4x12b
Number of I/O	57
Connectivity	EBI/EMI, I2C, Memory Card, SPI, SSC, UART/USART, USB
Peripherals	Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	100-LQFP (14x14)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the ATSAM3U1CA-AU is determined by strict equivalence across the following critical parameters:

Identical manufacturer (Microchip Technology)
Identical series designation (SAM3U)
Identical core processor architecture (ARM Cortex-M3)
Identical core size and configuration (32-Bit Single-Core)
Identical operating frequency (96MHz)
Identical program memory capacity and type (64KB FLASH)
Identical RAM capacity (20K x 8)
Identical supply voltage range (1.62V ~ 3.6V)
Identical data converter configuration (A/D 4x10b, 4x12b)
Identical I/O count (57)
Identical connectivity interfaces (EBI/EMI, I2C, Memory Card, SPI, SSC, UART/USART, USB)
Identical peripheral set (Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT)
Identical operating temperature range (-40°C ~ 85°C)
Identical package type and pinout (100-LQFP 14x14)
Compliance with ROHS3 and equivalent MSL ratings

Parameter Comparison

Parameter	ATSAM3U1CA-AU (Main)	ATSAM3U1CB-AU (Substitute)	Match
Manufacturer	Microchip Technology	Microchip Technology	✓
Series	SAM3U	SAM3U	✓
Core Processor	ARM Cortex-M3	ARM Cortex-M3	✓
Core Size	32-Bit Single-Core	32-Bit Single-Core	✓
Speed	96MHz	96MHz	✓
Program Memory Size	64KB (64K x 8)	64KB (64K x 8)	✓
Program Memory Type	FLASH	FLASH	✓
RAM Size	20K x 8	20K x 8	✓
Voltage Supply (Vcc/Vdd)	1.62V ~ 3.6V	1.62V ~ 3.6V	✓
Data Converters	A/D 4x10b, 4x12b	A/D 4x10b, 4x12b	✓
Number of I/O	57	57	✓
Connectivity	EBI/EMI, I2C, Memory Card, SPI, SSC, UART/USART, USB	EBI/EMI, I2C, Memory Card, SPI, SSC, UART/USART, USB	✓
Peripherals	Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT	Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT	✓
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	✓
Mounting Type	Surface Mount	Surface Mount	✓
Package / Case	100-LQFP (14x14)	100-LQFP (14x14)	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	✓
Product Status	Obsolete	Active	Upgrade

Engineering Selection Recommendations

The ATSAM3U1CB-AU is a direct functional equivalent to the ATSAM3U1CA-AU with identical electrical and mechanical specifications across all critical parameters. The primary distinction is product lifecycle status: the ATSAM3U1CA-AU is classified as obsolete, while the ATSAM3U1CB-AU maintains active status with Microchip Technology.

Both devices maintain ROHS3 compliance and equivalent moisture sensitivity ratings. The ATSAM3U1CB-AU is supplied in Tray packaging, whereas the main part packaging specification is not provided. Selection of the ATSAM3U1CB-AU is appropriate for new designs, production continuity, and replacement applications where the ATSAM3U1CA-AU is no longer available through standard procurement channels.

Frequently Asked Questions (FAQ)

Q: Are the ATSAM3U1CA-AU and ATSAM3U1CB-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 possible without layout modifications.

Q: Can the ATSAM3U1CB-AU replace the ATSAM3U1CA-AU in existing designs?

A: Yes. All electrical parameters, memory configurations, operating ranges, and peripheral sets are identical. Firmware and software compatibility is maintained.

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

A: The primary difference is product status. The ATSAM3U1CA-AU is obsolete, while the ATSAM3U1CB-AU is active. Both are SAM3U series devices with identical specifications.

Q: Are there packaging differences?

A: The ATSAM3U1CB-AU is specified with Tray packaging. Packaging specification for the ATSAM3U1CA-AU is not provided in the reference data.

Q: Do both parts meet the same compliance standards?

A: Yes. Both devices are ROHS3 compliant with MSL rating of 3 (168 Hours). REACH status is unaffected for both parts.

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

A: Both the ATSAM3U1CA-AU and ATSAM3U1CB-AU operate across -40°C to 85°C (TA).

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