AT91SAM7X128B-CU Equivalent & Substitute Parts

Part Overview

The AT91SAM7X128B-CU is an ARM7® SAM7X series microcontroller IC featuring 16/32-bit architecture, 55MHz operation, and 128KB FLASH memory in a 100-TFBGA (9x9) package. This device integrates CANbus, Ethernet, I2C, SPI, SSC, UART/USART, and USB connectivity with comprehensive peripheral support including DMA, PWM, and watchdog timer functionality.

The AT91SAM7X128B-CU is classified as obsolete. Identifying equivalent substitute parts is necessary to support legacy system maintenance, design updates, and procurement continuity when original inventory becomes unavailable.

Key Parameters

Parameter	Value
Core Processor	ARM7®
Core Size	16/32-Bit
Speed	55MHz
Program Memory Size	128KB (128K x 8)
Program Memory Type	FLASH
RAM Size	32K x 8
Voltage Supply (Vcc/Vdd)	1.65V ~ 1.95V
Number of I/O	62
Connectivity	CANbus, Ethernet, I2C, SPI, SSC, UART/USART, USB
Peripherals	Brown-out Detect/Reset, DMA, POR, PWM, WDT
Data Converters	A/D 8x10b
Oscillator Type	Internal
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	100-TFBGA (9x9)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the AT91SAM7X128B-CU is determined by strict equivalence across the following critical parameters:

Core Processor: ARM7®
Core Size: 16/32-Bit
Speed: 55MHz
Program Memory: 128KB FLASH
RAM: 32K x 8
Voltage Supply: 1.65V ~ 1.95V
I/O Count: 62 pins
Connectivity: CANbus, Ethernet, I2C, SPI, SSC, UART/USART, USB
Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
Data Converters: A/D 8x10b
Package: 100-TFBGA (9x9)
Mounting: Surface Mount

The AT91SAM7X128C-CU meets all substitution criteria as a direct equivalent within the SAM7X series, maintaining identical electrical specifications, pin configuration, and functional capabilities.

Parameter Comparison

Parameter	AT91SAM7X128B-CU	AT91SAM7X128C-CU
Manufacturer	Microchip Technology	Atmel
Core Processor	ARM7®	ARM7®
Core Size	16/32-Bit	16/32-Bit
Speed	55MHz	55MHz
Program Memory Size	128KB (128K x 8)	128KB (128K x 8)
Program Memory Type	FLASH	FLASH
RAM Size	32K x 8	32K x 8
Voltage Supply (Vcc/Vdd)	1.65V ~ 1.95V	1.65V ~ 1.95V
Number of I/O	62	62
Connectivity	CANbus, Ethernet, I2C, SPI, SSC, UART/USART, USB	CANbus, Ethernet, I2C, SPI, SSC, UART/USART, USB
Peripherals	Brown-out Detect/Reset, DMA, POR, PWM, WDT	Brown-out Detect/Reset, DMA, POR, PWM, WDT
Data Converters	A/D 8x10b	A/D 8x10b
Oscillator Type	Internal	Internal
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	100-TFBGA (9x9)	100-TFBGA (9x9)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
ECCN	3A991A2	3A991A2
HTSUS	8542.31.0001	8542.31.0001

Engineering Selection Recommendations

The AT91SAM7X128C-CU is a direct functional equivalent to the AT91SAM7X128B-CU. Both devices share identical electrical specifications, pin assignments, memory configuration, and peripheral integration within the SAM7X microcontroller family.

The primary distinction is product status: the AT91SAM7X128B-CU is obsolete, while the AT91SAM7X128C-CU maintains active production status. Both parts carry identical export control classifications (ECCN 3A991A2) and tariff codes (HTSUS 8542.31.0001), confirming regulatory equivalence.

For new designs or system updates, the AT91SAM7X128C-CU is the appropriate selection due to active availability and ongoing manufacturer support. For legacy system maintenance where AT91SAM7X128B-CU inventory exists, the AT91SAM7X128C-CU provides seamless substitution without design modification.

Frequently Asked Questions (FAQ)

Q: Are the AT91SAM7X128B-CU and AT91SAM7X128C-CU pin-compatible?

A: Yes. Both devices use the 100-TFBGA (9x9) package with identical pin assignments, voltage levels, and signal definitions. No PCB layout changes are required for substitution.

Q: Can the AT91SAM7X128C-CU replace the AT91SAM7X128B-CU in existing applications?

A: Yes. The devices are electrically and functionally equivalent across all specified parameters: core processor, clock speed, memory capacity, I/O count, connectivity interfaces, and peripheral functions. Existing firmware and hardware designs require no modification.

Q: What is the significance of the different part number suffixes (B vs. C)?

A: The suffix indicates manufacturing revision within the SAM7X series. Both revisions maintain identical functional specifications and are interchangeable from an engineering perspective.

Q: Are there compliance or certification differences between these parts?

A: No. Both parts carry identical ECCN and HTSUS classifications, confirming regulatory equivalence for export and tariff purposes.

Q: Why is the AT91SAM7X128B-CU listed as obsolete?

A: Microchip Technology has transitioned production to the AT91SAM7X128C-CU variant. The obsolete status reflects end-of-life for the B revision, not functional deficiency. The C revision provides continued support for the SAM7X 128KB platform.

Q: What packaging options are available for these microcontrollers?

A: Both parts are supplied in 100-TFBGA (9x9) surface mount packages. This is the only package configuration for this memory and feature set within the SAM7X series.

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