AT91SAM7XC128B-AU Equivalent & Substitute Parts

Part Overview

The AT91SAM7XC128B-AU is an ARM7® SAM7XC microcontroller IC featuring 16/32-bit architecture, 55MHz clock speed, and 128KB FLASH memory in a 100-LQFP package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The SAM7XC series has reached end-of-life status, requiring migration to active alternatives that maintain functional compatibility within the SAM family architecture.

Substiute Parts

AT91SAM7XC128B-AU

Microchip TechnologyIn Stock: 1198AT91SAM7XC128B-AU Datasheet

Current PartRFQ

ATSAM4E8CA-AU

Microchip TechnologyIn Stock: 1853ATSAM4E8CA-AU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT91SAM7XC128B-AU is based on the following criteria derived from the provided parameters:

Package Compatibility: Both the main part and substitute maintain the 100-LQFP (14x14) surface mount package, ensuring mechanical and electrical pin compatibility.

Microcontroller Architecture: The substitute part operates within the Microchip SAM microcontroller family, maintaining software compatibility through ARM-based instruction set architecture.

Operating Temperature Range: The substitute part supports the full -40°C ~ 85°C operating temperature range, meeting industrial and commercial application requirements.

Compliance Standards: Both parts maintain ROHS3 compliance and identical Moisture Sensitivity Level (MSL 3, 168 Hours), ensuring equivalent handling and storage requirements.

Supply Voltage Compatibility: The substitute part supports an extended voltage range (1.62V ~ 3.6V) that encompasses the original part's supply voltage specification (1.65V ~ 1.95V).

Connectivity and Peripherals: The substitute part includes all connectivity interfaces present in the original part (CANbus, Ethernet, UART/USART, SPI, USB) plus additional interfaces, ensuring functional compatibility for existing designs.

Parameter Comparison

Engineering Selection Recommendations

The ATSAM4E8CA-AU is the designated manufacturer substitute for the obsolete AT91SAM7XC128B-AU. Selection of this substitute is based on the following engineering criteria:

Product Status: The AT91SAM7XC128B-AU is obsolete, while the ATSAM4E8CA-AU maintains active product status with ongoing manufacturer support and availability.

Compliance Alignment: Both parts maintain identical ROHS3 compliance and Moisture Sensitivity Level (MSL 3), ensuring equivalent environmental and regulatory compliance for production environments.

Package Equivalence: The 100-LQFP (14x14) package is identical between both parts, eliminating the need for PCB redesign or layout modifications.

Connectivity Preservation: The substitute part retains all primary connectivity interfaces (CANbus, Ethernet, UART/USART, SPI, USB) specified in the original part, supporting existing firmware and hardware integration.

Enhanced Capabilities: The ATSAM4E8CA-AU provides increased processing performance (120MHz vs. 55MHz), expanded memory resources (512KB FLASH, 128KB RAM vs. 128KB FLASH, 32KB RAM), and enhanced analog capabilities (16x12-bit A/D and 2x12-bit D/A converters), enabling improved system performance without architectural changes.

Frequently Asked Questions (FAQ)

Q: Can the ATSAM4E8CA-AU be used as a direct replacement for the AT91SAM7XC128B-AU?

A: The ATSAM4E8CA-AU is pin-compatible and package-compatible with the AT91SAM7XC128B-AU in the 100-LQFP form factor. Firmware modifications may be required due to architectural differences between ARM7® and ARM® Cortex®-M4 processors, but the substitute maintains functional compatibility for core microcontroller operations.

Q: What are the key differences in electrical specifications?

A: The ATSAM4E8CA-AU supports an extended supply voltage range (1.62V ~ 3.6V) compared to the original part (1.65V ~ 1.95V). The substitute operates at 120MHz versus 55MHz, and provides significantly larger memory resources (512KB FLASH and 128KB RAM versus 128KB FLASH and 32KB RAM). Both parts maintain identical operating temperature ranges and MSL ratings.

Q: Are there any package or handling differences?

A: Both parts use the 100-LQFP (14x14) surface mount package with identical Moisture Sensitivity Level (MSL 3, 168 Hours) specifications. No changes to PCB assembly processes, soldering parameters, or component handling procedures are required.

Q: What connectivity interfaces are preserved in the substitute part?

A: The ATSAM4E8CA-AU retains all primary connectivity interfaces from the original part: CANbus, Ethernet, UART/USART, SPI, and USB. The substitute adds IrDA and MMC/SD interfaces, providing enhanced connectivity options without removing existing functionality.

Q: Is firmware migration required when switching to the ATSAM4E8CA-AU?

A: Firmware migration depends on the complexity of the original application. While both parts are ARM-based microcontrollers, the architectural transition from ARM7® to ARM® Cortex®-M4 may require code review and testing. Peripheral register layouts and interrupt handling may differ between the SAM7XC and SAM4E series.

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

A: The ATSAM4E8CA-AU maintains ROHS3 compliance and is REACH unaffected, matching the regulatory compliance profile of the original part. Both parts are suitable for industrial and commercial applications within the specified operating temperature range.