AT91SAM7S256C-AU Equivalent & Substitute Parts

Part Overview

The AT91SAM7S256C-AU is an ARM7® SAM7S series microcontroller IC featuring 16/32-bit architecture, 55MHz operation, and 256KB FLASH memory in a 64-LQFP package. This part is classified as obsolete, making identification of equivalent substitute components essential for ongoing production support, design updates, and inventory management. The AT91SAM7S256D-AU provides direct functional equivalence with improved product status and availability.

Substiute Parts

AT91SAM7S256C-AU

Microchip TechnologyIn Stock: 4128AT91SAM7S256C-AU Datasheet

Current PartRFQ

AT91SAM7S256D-AU

Microchip TechnologyIn Stock: 11288AT91SAM7S256D-AU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The AT91SAM7S256D-AU qualifies as a direct substitute for the AT91SAM7S256C-AU based on identical electrical and mechanical parameters. Substitution is valid when the following criteria are met:

Core processor architecture (ARM7®), core size (16/32-bit), clock speed (55MHz), program memory capacity (256KB FLASH), RAM capacity (64K x 8), supply voltage range (1.65V ~ 1.95V), data converter specifications (A/D 8x10b), I/O count (32 pins), connectivity interfaces (I2C, SPI, SSC, UART/USART, USB), peripheral features (Brown-out Detect/Reset, DMA, POR, PWM, WDT), operating temperature range (-40°C ~ 85°C), package type (64-LQFP 10x10), and compliance certifications (ROHS3, MSL 3) remain unchanged.

The primary distinction between these parts is product status and packaging format. The AT91SAM7S256C-AU is obsolete with limited availability, while the AT91SAM7S256D-AU maintains active product status with higher inventory levels and tray packaging.

Parameter Comparison

Engineering Selection Recommendations

The AT91SAM7S256D-AU is the appropriate selection for new designs and production continuity. This part maintains active product status with Microchip Technology, ensuring long-term availability and supply chain stability. Both parts carry identical ROHS3 compliance and MSL 3 certification, meeting environmental and moisture handling requirements.

For existing designs currently using the AT91SAM7S256C-AU, direct substitution with the AT91SAM7S256D-AU is valid without circuit modification or firmware changes. The tray packaging format of the substitute part is standard for active production components and presents no technical incompatibility.

Frequently Asked Questions (FAQ)

Q: Are the AT91SAM7S256C-AU and AT91SAM7S256D-AU pin-compatible?

A: Yes. Both parts use the 64-LQFP (10x10) package with identical pin assignments, voltage specifications, and I/O configurations. Direct PCB substitution is possible without layout modifications.

Q: What is the difference between the packaging formats?

A: The AT91SAM7S256C-AU uses standard packaging, while the AT91SAM7S256D-AU uses tray packaging. Both formats are compatible with standard pick-and-place assembly equipment. Tray packaging is the current standard for active production components.

Q: Can firmware developed for the AT91SAM7S256C-AU run on the AT91SAM7S256D-AU?

A: Yes. Identical core processor architecture, memory configuration, and peripheral specifications ensure complete firmware compatibility. No code modifications are required.

Q: Are there any compliance differences between these parts?

A: No. Both parts maintain ROHS3 compliance and MSL 3 (168 Hours) certification. Environmental and regulatory requirements are identical.

Q: Why is the AT91SAM7S256C-AU classified as obsolete?

A: Product obsolescence reflects Microchip Technology's lifecycle management. The AT91SAM7S256D-AU provides equivalent functionality with active production support and improved availability.