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ATSAM3U1CA-CU Equivalent & Substitute Parts
Part Overview
The ATSAM3U1CA-CU is an ARM Cortex-M3 SAM3U microcontroller IC featuring 32-bit single-core architecture operating at 96MHz with 64KB FLASH memory and 20KB RAM. This device is classified as obsolete, necessitating identification of active equivalent parts for new designs and production continuity. The part is housed in a 100-TFBGA (9x9) package and operates across a supply voltage range of 1.62V to 3.6V with an operating temperature range of -40°C to 85°C.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Core Processor | ARM® Cortex®-M3 |
| Core Size | 32-Bit Single-Core |
| Speed | 96MHz |
| Program Memory Size | 64KB (64K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 20K x 8 |
| Voltage - Supply (Vcc/Vdd) | 1.62V ~ 3.6V |
| Number of I/O | 57 |
| Package / Case | 100-TFBGA (9x9) |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) |
Substitute Part Grouping Explanation
The ATSAM3U1CB-CU qualifies as a direct substitute for the ATSAM3U1CA-CU based on the following matching parameters:
- Identical core processor architecture: ARM Cortex-M3
- Matching core size: 32-Bit Single-Core
- Identical operating frequency: 96MHz
- Identical program memory configuration: 64KB FLASH
- Identical RAM capacity: 20K x 8
- Matching supply voltage range: 1.62V ~ 3.6V
- Identical I/O count: 57 pins
- Identical package specification: 100-TFBGA (9x9)
- Matching operating temperature range: -40°C ~ 85°C
- Identical connectivity interfaces: EBI/EMI, I2C, Memory Card, SPI, SSC, UART/USART, USB
- Identical peripheral set: Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT
- Identical data converter configuration: A/D 4x10b, 4x12b
- Matching compliance certifications: ROHS3 Compliant, REACH Unaffected
The primary distinction is product status: ATSAM3U1CA-CU is obsolete while ATSAM3U1CB-CU is active, with significantly higher inventory availability (2693 units versus 784 units).
Parameter Comparison
| Parameter | ATSAM3U1CA-CU | ATSAM3U1CB-CU | Match |
|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | ✓ |
| Series | SAM3U | SAM3U | ✓ |
| Core Processor | ARM® Cortex®-M3 | ARM® Cortex®-M3 | ✓ |
| Core Size | 32-Bit Single-Core | 32-Bit Single-Core | ✓ |
| Speed | 96MHz | 96MHz | ✓ |
| Program Memory Size | 64KB (64K x 8) | 64KB (64K x 8) | ✓ |
| RAM Size | 20K x 8 | 20K x 8 | ✓ |
| Voltage - Supply (Vcc/Vdd) | 1.62V ~ 3.6V | 1.62V ~ 3.6V | ✓ |
| Number of I/O | 57 | 57 | ✓ |
| Package / Case | 100-TFBGA (9x9) | 100-TFBGA (9x9) | ✓ |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | ✓ |
| Mounting Type | Surface Mount | Surface Mount | ✓ |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ✓ |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) | 3 (168 Hours) | ✓ |
| Product Status | Obsolete | Active | Different |
| Packaging | Not specified | Tray | Different |
Engineering Selection Recommendations
The ATSAM3U1CB-CU is the direct functional equivalent for the ATSAM3U1CA-CU. Selection of the ATSAM3U1CB-CU is supported by the following factors:
- All electrical parameters are identical across both parts
- All mechanical specifications match, including package dimensions and pin configuration
- Both parts maintain ROHS3 compliance and REACH unaffected status
- The ATSAM3U1CB-CU carries active product status with established supply chain availability
- The ATSAM3U1CB-CU is available in tray packaging, suitable for production environments
- Inventory levels for ATSAM3U1CB-CU (2693 units) provide superior supply continuity compared to the obsolete ATSAM3U1CA-CU
For applications currently using ATSAM3U1CA-CU, direct substitution with ATSAM3U1CB-CU requires no design modifications, PCB layout changes, or firmware adjustments.
Frequently Asked Questions (FAQ)
Q: Can ATSAM3U1CB-CU replace ATSAM3U1CA-CU in existing designs?
A: Yes. The ATSAM3U1CB-CU is a direct pin-for-pin and functional equivalent. No design modifications are required for substitution.
Q: Are there differences in electrical performance between these parts?
A: No. Both parts share identical core processor architecture, clock speed, memory configuration, supply voltage range, operating temperature range, and peripheral interfaces.
Q: What is the significance of the product status difference?
A: ATSAM3U1CA-CU is classified as obsolete, indicating discontinued production and limited long-term availability. ATSAM3U1CB-CU is active, ensuring ongoing manufacturing and supply chain support.
Q: Are the package specifications identical?
A: Yes. Both parts use the 100-TFBGA (9x9) package with identical pin assignments, mechanical dimensions, and mounting requirements.
Q: Does packaging format affect substitution?
A: Packaging format (tray for ATSAM3U1CB-CU versus unspecified for ATSAM3U1CA-CU) does not affect electrical or mechanical compatibility. Tray packaging is standard for production environments.
Q: Are compliance certifications maintained across both parts?
A: Yes. Both parts maintain ROHS3 compliance and REACH unaffected status with identical moisture sensitivity levels (MSL 3, 168 hours).
Q: What connectivity interfaces are supported?
A: Both parts support identical interfaces: EBI/EMI, I2C, Memory Card, SPI, SSC, UART/USART, and USB.
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