AT91SAM7S128C-MU Equivalent & Substitute Parts

Part Overview

The AT91SAM7S128C-MU is an ARM7® SAM7S series microcontroller IC featuring 16/32-bit architecture, 55MHz operation, and 128KB FLASH memory in a 64-QFN (9x9) surface mount package. This part is classified as obsolete, making identification of compatible substitutes essential for ongoing system support and new design implementations. The SAM7S128 base product line provides consistent core functionality across packaging and operational variants, enabling direct substitution where electrical and mechanical parameters align.

Substiute Parts

AT91SAM7S128C-MU

Microchip TechnologyIn Stock: 1066AT91SAM7S128C-MU Datasheet

Current PartRFQ

AT91SAM7S128D-MU

Microchip TechnologyIn Stock: 3235AT91SAM7S128D-MU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT91SAM7S128C-MU is determined by strict alignment of the following critical parameters:

Core Electrical Parameters: ARM7® processor architecture, 16/32-bit core size, 55MHz clock speed, 128KB FLASH memory capacity, 32KB RAM, and 32 I/O pins must remain constant across all substitute parts.

Connectivity & Peripherals: I2C, SPI, SSC, UART/USART, and USB interfaces, combined with Brown-out Detect/Reset, DMA, POR, PWM, and WDT functionality, define the functional feature set and must be preserved.

Power & Environmental Specifications: Supply voltage range of 1.65V ~ 1.95V and operating temperature range of -40°C ~ 85°C establish the operational envelope.

Physical Package: 64-QFN (9x9) surface mount package with 64-VFQFN Exposed Pad configuration ensures mechanical and thermal compatibility.

Base Product Designation: All substitutes must share the AT91SAM7S128 base product number, confirming core silicon equivalence.

Variations in packaging type (tube vs. tray), product status (obsolete vs. active), and moisture sensitivity level (MSL) do not affect electrical or functional substitutability.

Parameter Comparison

Engineering Selection Recommendations

The AT91SAM7S128D-MU is a direct electrical and functional equivalent to the AT91SAM7S128C-MU. All core processor specifications, memory configurations, I/O counts, connectivity interfaces, and peripheral functions are identical. Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent component selection.

The primary distinction between these parts is product lifecycle status: the AT91SAM7S128C-MU is classified as obsolete, while the AT91SAM7S128D-MU maintains active product status with current manufacturing availability. The AT91SAM7S128D-MU is supplied in tray packaging versus tube packaging for the C variant, and carries a higher moisture sensitivity level (MSL 3 vs. MSL 1), reflecting standard industry practices for active production components.

For new designs and ongoing system support where the AT91SAM7S128C-MU is unavailable, the AT91SAM7S128D-MU provides complete functional and electrical substitution without design modification or board-level changes.

Frequently Asked Questions (FAQ)

Q: Can AT91SAM7S128D-MU replace AT91SAM7S128C-MU in existing designs?

A: Yes. The AT91SAM7S128D-MU is electrically and functionally identical to the AT91SAM7S128C-MU. All processor core specifications, memory capacity, I/O configuration, connectivity interfaces, and peripheral functions are equivalent. No circuit modifications or firmware changes are required.

Q: What is the difference between the C and D variants?

A: The C and D variants differ in product status, packaging format, and moisture sensitivity level. The C variant is obsolete and supplied in tube packaging with MSL 1 (unlimited moisture exposure). The D variant is active production, supplied in tray packaging with MSL 3 (168-hour moisture exposure limit). Electrical and functional specifications are identical.

Q: Are there any package compatibility concerns?

A: No. Both parts use the identical 64-QFN (9x9) surface mount package with 64-VFQFN Exposed Pad configuration. PCB footprints, solder reflow profiles, and thermal management approaches remain unchanged.

Q: Does the higher MSL rating of the D variant affect performance?

A: No. Moisture sensitivity level (MSL) is a manufacturing and storage specification that does not affect electrical performance or functional operation. MSL 3 indicates standard moisture handling requirements during component storage and assembly processes.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both AT91SAM7S128C-MU and AT91SAM7S128D-MU are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: What supply voltage range do these parts support?

A: Both parts operate at 1.65V ~ 1.95V supply voltage. This low-voltage specification is consistent across all SAM7S128 variants and must be maintained in system power supply design.