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ATSAM3U1EA-CU Equivalent & Substitute Parts
Part Overview
The ATSAM3U1EA-CU is a 32-bit ARM Cortex-M3 microcontroller from Microchip Technology's SAM3U series, featuring 64KB Flash memory, 20KB RAM, and 96 I/O pins in a 144-BGA package. This device is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. The ATSAM3U1EB-CU serves as the direct functional equivalent with active product status.
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 |
| Number of I/O | 96 |
| Voltage Supply (Vcc/Vdd) | 1.62V ~ 3.6V |
| Data Converters | A/D 8x10b, 8x12b |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 144-LFBGA (13x13) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| MSL Rating | 3 (168 Hours) |
Substitute Part Grouping Explanation
The ATSAM3U1EB-CU qualifies as a direct substitute for the ATSAM3U1EA-CU based on identical electrical and mechanical parameters. Substitution is valid when the following criteria are met:
- Identical core processor architecture (ARM Cortex-M3)
- Matching clock speed (96MHz)
- Identical program memory capacity (64KB Flash)
- Identical RAM capacity (20KB)
- Identical I/O pin count (96)
- Identical supply voltage range (1.62V ~ 3.6V)
- Identical data converter specifications (A/D 8x10b, 8x12b)
- Identical operating temperature range (-40°C ~ 85°C)
- Identical package type and pinout (144-LFBGA 13x13)
- 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)
Parameter Comparison
| Parameter | ATSAM3U1EA-CU | ATSAM3U1EB-CU | Match |
|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Yes |
| Series | SAM3U | SAM3U | Yes |
| Core Processor | ARM Cortex-M3 | ARM Cortex-M3 | Yes |
| Core Size | 32-Bit Single-Core | 32-Bit Single-Core | Yes |
| Speed | 96MHz | 96MHz | Yes |
| Program Memory Size | 64KB (64K x 8) | 64KB (64K x 8) | Yes |
| Program Memory Type | FLASH | FLASH | Yes |
| RAM Size | 20K x 8 | 20K x 8 | Yes |
| Number of I/O | 96 | 96 | Yes |
| Voltage Supply (Vcc/Vdd) | 1.62V ~ 3.6V | 1.62V ~ 3.6V | Yes |
| Data Converters | A/D 8x10b, 8x12b | A/D 8x10b, 8x12b | Yes |
| Oscillator Type | Internal | Internal | Yes |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | Yes |
| Mounting Type | Surface Mount | Surface Mount | Yes |
| Package / Case | 144-LFBGA (13x13) | 144-LFBGA (13x13) | Yes |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Yes |
| MSL Rating | 3 (168 Hours) | 3 (168 Hours) | Yes |
| Product Status | Obsolete | Active | Different |
Engineering Selection Recommendations
The ATSAM3U1EB-CU is the appropriate substitute for the ATSAM3U1EA-CU. The primary distinction is product lifecycle status: the ATSAM3U1EA-CU is obsolete while the ATSAM3U1EB-CU maintains active product status from Microchip Technology. All electrical specifications, memory configurations, I/O capabilities, and package specifications are identical between the two parts. Both devices are ROHS3 compliant and carry identical MSL ratings. The ATSAM3U1EB-CU is available in Tray packaging, supporting production continuity for designs currently using the ATSAM3U1EA-CU.
Frequently Asked Questions (FAQ)
Q: Are the ATSAM3U1EA-CU and ATSAM3U1EB-CU pin-compatible?
A: Yes. Both devices use the 144-LFBGA (13x13) package with identical pinout and electrical characteristics. No PCB redesign is required for substitution.
Q: What is the primary reason to substitute the ATSAM3U1EA-CU?
A: The ATSAM3U1EA-CU is classified as obsolete. The ATSAM3U1EB-CU provides identical functionality with active product status, ensuring long-term availability and supply chain continuity.
Q: Are there any differences in memory specifications between these parts?
A: No. Both parts feature 64KB Flash memory and 20KB RAM with identical access specifications.
Q: Do both parts support the same connectivity interfaces?
A: Yes. Both the ATSAM3U1EA-CU and ATSAM3U1EB-CU support EBI/EMI, I2C, Memory Card, SPI, SSC, UART/USART, and USB interfaces.
Q: What is the difference in packaging between these parts?
A: The ATSAM3U1EA-CU packaging is not specified in available data. The ATSAM3U1EB-CU is supplied in Tray packaging. Both use the same 144-LFBGA (13x13) case.
Q: Are both parts compliant with current environmental standards?
A: Yes. Both the ATSAM3U1EA-CU and ATSAM3U1EB-CU are ROHS3 compliant and REACH unaffected, meeting current environmental regulations.
Q: Can I use the ATSAM3U1EB-CU as a direct replacement without firmware modifications?
A: Yes. Identical core processor, memory, and peripheral specifications ensure firmware compatibility without modification.
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