AT91SAM7S512-MU Equivalent & Substitute Parts

Part Overview

The AT91SAM7S512-MU is an ARM7® SAM7S series microcontroller IC featuring 16/32-bit architecture, 55MHz operation, and 512KB FLASH memory in a 64-QFN (9x9) surface mount package. This device is classified as obsolete, making identification of compatible substitute parts essential for ongoing production support, maintenance, and design continuity. The SAM7S512B-MU provides direct functional equivalence while maintaining active product status.

Key Parameters

Parameter	Value
Core Processor	ARM7®
Core Size	16/32-Bit
Speed	55MHz
Program Memory Size	512KB (512K x 8)
Program Memory Type	FLASH
RAM Size	64K x 8
Voltage Supply (Vcc/Vdd)	1.65V ~ 1.95V
Number of I/O	32
Data Converters	A/D 8x10b
Connectivity	I2C, SPI, SSC, UART/USART, USB
Peripherals	Brown-out Detect/Reset, DMA, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	64-VFQFN Exposed Pad
Supplier Device Package	64-QFN (9x9)
Series	SAM7S

Substitute Part Grouping Explanation

Substitution of the AT91SAM7S512-MU is determined by strict equivalence across all electrical and mechanical parameters. The AT91SAM7S512B-MU qualifies as a direct substitute based on the following criteria:

Core processor architecture (ARM7®), bit width (16/32-Bit), clock speed (55MHz), program memory capacity (512KB FLASH), RAM allocation (64K x 8), supply voltage range (1.65V ~ 1.95V), I/O count (32 pins), data converter specification (A/D 8x10b), connectivity interfaces (I2C, SPI, SSC, UART/USART, USB), peripheral feature set (Brown-out Detect/Reset, DMA, POR, PWM, WDT), operating temperature range (-40°C ~ 85°C), and physical package specification (64-VFQFN Exposed Pad, 64-QFN 9x9) are identical between the main part and substitute.

The primary distinction is product status: AT91SAM7S512-MU is obsolete, while AT91SAM7S512B-MU maintains active status with higher inventory availability.

Parameter Comparison

Parameter	AT91SAM7S512-MU	AT91SAM7S512B-MU	Match
Manufacturer	Microchip Technology	Microchip Technology	✓
Series	SAM7S	SAM7S	✓
Core Processor	ARM7®	ARM7®	✓
Core Size	16/32-Bit	16/32-Bit	✓
Speed	55MHz	55MHz	✓
Program Memory Size	512KB (512K x 8)	512KB (512K x 8)	✓
Program Memory Type	FLASH	FLASH	✓
RAM Size	64K x 8	64K x 8	✓
Voltage Supply (Vcc/Vdd)	1.65V ~ 1.95V	1.65V ~ 1.95V	✓
Number of I/O	32	32	✓
Data Converters	A/D 8x10b	A/D 8x10b	✓
Connectivity	I2C, SPI, SSC, UART/USART, USB	I2C, SPI, SSC, UART/USART, USB	✓
Peripherals	Brown-out Detect/Reset, DMA, POR, PWM, WDT	Brown-out Detect/Reset, DMA, POR, PWM, WDT	✓
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	✓
Mounting Type	Surface Mount	Surface Mount	✓
Package / Case	64-VFQFN Exposed Pad	64-VFQFN Exposed Pad	✓
Supplier Device Package	64-QFN (9x9)	64-QFN (9x9)	✓
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	Different

Engineering Selection Recommendations

The AT91SAM7S512B-MU is the direct functional equivalent for AT91SAM7S512-MU applications. Selection of the substitute part is supported by:

Complete electrical parameter equivalence across all specified operating conditions, memory configurations, and interface protocols. Identical physical package specification ensures PCB layout and assembly compatibility without design modification. Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements. The AT91SAM7S512B-MU maintains active product status with established supply chain availability, addressing the obsolescence of the original part number. Moisture sensitivity level (MSL 3, 168 hours) and operating temperature range (-40°C ~ 85°C) are identical, ensuring equivalent reliability in specified environmental conditions.

Frequently Asked Questions (FAQ)

Q: Can AT91SAM7S512B-MU directly replace AT91SAM7S512-MU in existing designs?

A: Yes. All electrical parameters, memory specifications, I/O configuration, connectivity interfaces, and physical package dimensions are identical. No circuit design changes are required.

Q: Are there differences in pin configuration or pinout between these parts?

A: No. Both parts use the 64-VFQFN Exposed Pad package with 64-QFN (9x9) dimensions. Pinout is identical.

Q: What is the primary reason for substitution?

A: AT91SAM7S512-MU is classified as obsolete. AT91SAM7S512B-MU provides equivalent functionality with active product status and improved supply availability.

Q: Do both parts meet the same compliance standards?

A: Yes. Both parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity level (MSL 3, 168 hours) and ECCN/HTSUS classifications.

Q: Are there packaging differences between the two part numbers?

A: The main part number does not specify packaging detail. AT91SAM7S512B-MU is supplied in Tray packaging. Both parts are surface mount components in identical physical packages.

Q: What is the operating temperature range for both parts?

A: Both parts operate across -40°C to 85°C (TA), ensuring equivalent thermal performance in specified applications.

Q: Are the supply voltage requirements identical?

A: Yes. Both parts require 1.65V to 1.95V supply voltage (Vcc/Vdd) with identical electrical characteristics across this range.

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