ATSAM3U1EA-AU Equivalent & Substitute Parts

Part Overview

The ATSAM3U1EA-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. The device is currently classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Core Processor	ARM® Cortex®-M3
Core Size	32-Bit Single-Core
Speed	96MHz
Program Memory Size	64KB (64K x 8) FLASH
RAM Size	20K x 8
Voltage Supply (Vcc/Vdd)	1.62V ~ 3.6V
Number of I/O	96
Data Converters	A/D 8x10b, 8x12b
Connectivity	EBI/EMI, I2C, Memory Card, SPI, SSC, UART/USART, USB
Peripherals	Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT
Package / Case	144-LQFP (20x20)
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

The ATSAM3U1EB-AU qualifies as a direct substitute for the ATSAM3U1EA-AU based on identical electrical and mechanical specifications. Substitution is valid when the following parameters match:

Core processor architecture: ARM Cortex-M3
Core size and speed: 32-Bit Single-Core at 96MHz
Memory configuration: 64KB FLASH and 20KB RAM
I/O count: 96 pins
Voltage supply range: 1.62V ~ 3.6V
Data converter specifications: A/D 8x10b, 8x12b
Connectivity interfaces: EBI/EMI, I2C, Memory Card, SPI, SSC, UART/USART, USB
Peripheral set: Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT
Package type: 144-LQFP (20x20)
Operating temperature range: -40°C ~ 85°C
Compliance standards: ROHS3, REACH Unaffected

Parameter Comparison

Parameter	ATSAM3U1EA-AU	ATSAM3U1EB-AU	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) FLASH	64KB (64K x 8) FLASH	✓
RAM Size	20K x 8	20K x 8	✓
Voltage - Supply (Vcc/Vdd)	1.62V ~ 3.6V	1.62V ~ 3.6V	✓
Number of I/O	96	96	✓
Data Converters	A/D 8x10b, 8x12b	A/D 8x10b, 8x12b	✓
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	✓
Package / Case	144-LQFP (20x20)	144-LQFP (20x20)	✓
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)	✓
REACH Status	REACH Unaffected	REACH Unaffected	✓
Product Status	Obsolete	Active	Different
Packaging	Not specified	Tray	N/A

Engineering Selection Recommendations

The ATSAM3U1EB-AU is the direct equivalent substitute for the ATSAM3U1EA-AU. All electrical specifications, pin configurations, memory architecture, and peripheral functionality are identical. The primary distinction is product status: the ATSAM3U1EA-AU is obsolete while the ATSAM3U1EB-AU is active, ensuring ongoing availability and manufacturer support.

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for new designs and legacy system maintenance. The ATSAM3U1EB-AU is supplied in Tray packaging, which is standard for active production inventory.

Frequently Asked Questions (FAQ)

Q: Can the ATSAM3U1EB-AU be used as a direct replacement for the ATSAM3U1EA-AU?

A: Yes. The ATSAM3U1EB-AU is electrically and mechanically identical to the ATSAM3U1EA-AU. All specifications including processor architecture, memory configuration, I/O count, voltage supply range, connectivity interfaces, and peripheral set are equivalent. Pin-for-pin compatibility is confirmed.

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

A: The primary difference is product lifecycle status. The ATSAM3U1EA-AU is classified as obsolete, while the ATSAM3U1EB-AU is active. Both parts share identical technical specifications and are from the same SAM3U series manufactured by Microchip Technology.

Q: Are there any packaging differences?

A: The ATSAM3U1EA-AU packaging is not specified in available documentation. The ATSAM3U1EB-AU is supplied in Tray packaging. Both use the 144-LQFP (20x20) package case for surface mount applications.

Q: Will the ATSAM3U1EB-AU work in existing designs using the ATSAM3U1EA-AU?

A: Yes. The identical electrical and mechanical specifications ensure functional compatibility in existing PCB layouts and firmware implementations. No design modifications are required.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the ATSAM3U1EA-AU and ATSAM3U1EB-AU are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: Both parts have MSL 3 with a 168-hour floor life rating, requiring standard moisture control handling procedures during storage and assembly.

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