ATSAM3N2BA-MU Equivalent & Substitute Parts

Part Overview

The ATSAM3N2BA-MU is an ARM Cortex-M3 SAM3N microcontroller IC featuring 32-bit single-core architecture, 48MHz clock speed, 128KB FLASH memory, and 16KB RAM in a 64-QFN (9x9) surface mount package. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support, production continuity, and system upgrades. Substitute parts are selected based on matching electrical specifications, package compatibility, and functional equivalence within the Microchip embedded microcontroller portfolio.

Substiute Parts

ATSAM3N2BA-MU

Microchip TechnologyIn Stock: 967ATSAM3N2BA-MU Datasheet

Current PartRFQ

ATSAM4N8BA-MU

Microchip TechnologyIn Stock: 1973ATSAM4N8BA-MU Datasheet

DirectRFQ

ATSAM4S2BA-MU

Microchip TechnologyIn Stock: 4136ATSAM4S2BA-MU Datasheet

DirectRFQ

PIC32MX530F128H-I/MR

Microchip TechnologyIn Stock: 1795PIC32MX530F128H-I/MR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ATSAM3N2BA-MU are selected based on the following critical parameters that determine functional and physical compatibility:

Matching Criteria:

• Package type: 64-VFQFN Exposed Pad (9x9) surface mount
• Voltage supply range: 1.62V ~ 3.6V
• Operating temperature range: -40°C ~ 85°C
• Number of I/O pins: 47
• Program memory type: FLASH
• Connectivity interfaces: I2C, IrDA, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• RoHS3 compliance and REACH unaffected status

Substitution Logic: The ATSAM4S2BA-MU and ATSAM4N8BA-MU are direct functional substitutes offering enhanced performance characteristics while maintaining package and pin compatibility. The PIC32MX530F128H-I/MR provides an alternative architecture option with equivalent memory and package specifications. All substitutes maintain the same 64-QFN package footprint, voltage supply range, operating temperature range, and core peripheral set, enabling drop-in replacement capability with potential firmware recompilation requirements due to architectural differences.

Parameter Comparison

Engineering Selection Recommendations

ATSAM4S2BA-MU is the primary substitute for the ATSAM3N2BA-MU. This part maintains identical program memory capacity (128KB FLASH), matching I/O count (47), and package footprint while offering enhanced performance through ARM Cortex-M4 architecture and 120MHz clock speed. The ATSAM4S2BA-MU is in active product status with ROHS3 compliance and REACH unaffected certification. Increased RAM capacity (64K x 8 versus 16K x 8) and enhanced data converter specifications (16x12-bit A/D, 2x12-bit D/A versus 10x10-bit A/D, 1x10-bit D/A) provide additional design margin. Additional connectivity options including Memory Card, SSC, and USB interfaces expand application flexibility.

ATSAM4N8BA-MU serves as an alternative substitute offering the highest program memory capacity (512KB FLASH) within the SAM4N series. This part maintains the same package, I/O count, and voltage specifications while providing 100MHz clock speed and 64K x 8 RAM. The ATSAM4N8BA-MU is in active product status with ROHS3 compliance. This option is suitable for applications requiring expanded memory capacity without architectural change.

PIC32MX530F128H-I/MR provides a cross-architecture alternative based on MIPS32 M4K processor technology. This part matches the 128KB FLASH memory and 16K x 8 RAM of the original ATSAM3N2BA-MU while operating at 40MHz. The PIC32MX530F128H-I/MR is in active product status with ROHS3 compliance and offers expanded connectivity including CANbus, LINbus, PMP, USB OTG, and I2S interfaces. This option requires firmware recompilation due to architectural differences but maintains equivalent electrical and package specifications. The minimum voltage supply is 2.3V, which is higher than the original part's 1.62V minimum.

Frequently Asked Questions (FAQ)

Q: Can the ATSAM4S2BA-MU directly replace the ATSAM3N2BA-MU without PCB modifications?

A: Yes. Both parts use identical 64-VFQFN Exposed Pad (9x9) package with 47 I/O pins in the same pinout configuration. No PCB layout changes are required. However, firmware recompilation is necessary due to architectural differences between ARM Cortex-M3 and ARM Cortex-M4 processors.

Q: What are the key differences between ATSAM4S2BA-MU and ATSAM4N8BA-MU substitutes?

A: The ATSAM4S2BA-MU maintains the original 128KB FLASH memory capacity with 120MHz clock speed and includes additional connectivity interfaces (Memory Card, SSC, USB). The ATSAM4N8BA-MU provides 512KB FLASH memory with 100MHz clock speed and standard SAM4N connectivity. Selection depends on application memory requirements and interface needs.

Q: Is the PIC32MX530F128H-I/MR a suitable substitute for the ATSAM3N2BA-MU?

A: The PIC32MX530F128H-I/MR matches the original part's 128KB FLASH memory, 16K x 8 RAM, and 64-QFN package specifications. However, it uses MIPS32 M4K architecture instead of ARM Cortex-M3, requiring complete firmware rewrite. The minimum voltage supply is 2.3V versus 1.62V for the original part. This option is suitable only when firmware recompilation is feasible and voltage supply constraints are acceptable.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The ATSAM4S2BA-MU, ATSAM4N8BA-MU, and PIC32MX530F128H-I/MR are all ROHS3 compliant with REACH unaffected status, matching the original ATSAM3N2BA-MU compliance certifications.

Q: What is the impact of increased clock speed in substitute parts?

A: The ATSAM4S2BA-MU (120MHz) and ATSAM4N8BA-MU (100MHz) offer higher clock speeds than the original ATSAM3N2BA-MU (48MHz). This enables faster code execution and improved real-time performance. Power consumption may increase proportionally with clock speed. Firmware timing-dependent code requires validation and potential adjustment.

Q: Can I use the PIC32MX530F128H-I/MR if my application requires 1.62V minimum supply voltage?

A: No. The PIC32MX530F128H-I/MR specifies a minimum supply voltage of 2.3V, which is incompatible with applications requiring 1.62V operation. The ATSAM4S2BA-MU or ATSAM4N8BA-MU must be used for low-voltage applications, as both maintain the 1.62V ~ 3.6V supply range of the original part.