AT91SAM9XE128-CU Equivalent & Substitute Parts

Part Overview

The AT91SAM9XE128-CU is an ARM926EJ-S based microprocessor from Microchip Technology's SAM9XE series, designed for embedded applications requiring 32-bit processing at 180MHz. This device integrates SDRAM and SRAM controllers, LCD/touchscreen interfaces, 10/100Mbps Ethernet, and multiple communication protocols including USB 2.0, I2C, SPI, and UART/USART. The AT91SAM9XE128-CU is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. The primary substitute maintains identical electrical and mechanical specifications while offering active product status.

Substiute Parts

AT91SAM9XE128-CU

Microchip TechnologyIn Stock: 851AT91SAM9XE128-CU Datasheet

Current PartRFQ

AT91SAM9XE256B-CU

Microchip TechnologyIn Stock: 954AT91SAM9XE256B-CU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT91SAM9XE128-CU is determined by strict equivalence across the following critical parameters:

• Processor Architecture: ARM926EJ-S core with identical instruction set compatibility
• Processing Speed: 180MHz operation frequency
• Memory Controllers: SDRAM and SRAM controller support
• Interface Capabilities: LCD, touchscreen, Ethernet, USB 2.0, and serial communication protocols
• Electrical Specifications: I/O voltage levels (1.8V, 2.5V, 3.3V) and operating temperature range (-40°C ~ 85°C)
• Physical Package: 217-LFBGA (15x15) ball grid array form factor
• Compliance Standards: ROHS3 compliance and MSL 3 rating

The AT91SAM9XE256B-CU meets all these criteria, providing direct functional and physical compatibility while offering active product status for new designs and production support.

Parameter Comparison

Engineering Selection Recommendations

The AT91SAM9XE256B-CU is the direct equivalent substitute for the AT91SAM9XE128-CU. Both devices share identical electrical specifications, physical packaging, and functional capabilities across all processor, memory, interface, and communication parameters.

The primary distinction is product status: the AT91SAM9XE128-CU is classified as obsolete, while the AT91SAM9XE256B-CU maintains active status. This status difference ensures continued manufacturing support, supply chain availability, and compliance documentation for the substitute part.

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for industrial and commercial embedded applications. The identical MSL 3 rating (168 hours) applies to both devices for moisture-sensitive handling protocols.

Frequently Asked Questions (FAQ)

Q: Are the AT91SAM9XE128-CU and AT91SAM9XE256B-CU pin-compatible?

A: Yes. Both devices use the 217-LFBGA (15x15) package with identical pinout, electrical characteristics, and interface specifications. Direct PCB-level substitution is supported without layout modifications.

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

A: The devices are functionally and electrically equivalent across all specified parameters. The AT91SAM9XE256B-CU differs primarily in product status (active versus obsolete) and internal memory configuration, which does not affect external interface compatibility or electrical operation.

Q: Can I use the AT91SAM9XE256B-CU as a drop-in replacement in existing designs?

A: Yes. The substitute part maintains identical voltage levels (1.8V, 2.5V, 3.3V), operating temperature range (-40°C ~ 85°C), and all interface specifications. No circuit modifications are required.

Q: Are there any compliance or certification differences?

A: No. Both parts carry identical ROHS3 compliance, REACH unaffected status, ECCN classification (3A991A2), and HTSUS code (8542.31.0001). MSL 3 handling requirements apply to both devices.

Q: What interfaces are supported by the substitute part?

A: The AT91SAM9XE256B-CU supports all interfaces present in the original part: LCD and touchscreen controllers, 10/100Mbps Ethernet, USB 2.0 (3 ports), I2C, SPI, UART/USART, MMC/SD/SDIO, SSC, and EBI/EMI for external memory and peripheral expansion.