ATSAMA5D21A-CUR - 500MHz Cortex-A5 MPU, 196-TFBGA | Microchip
MPN: ATSAMA5D21A-CUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $17.2 | $172.00 |
| 100 | $15.85 | $1,585.00 |
| 500 | $14.4 | $7,200.00 |
| 1,000 | $13.1 | $13,100.00 |
ATSAMA5D21A-CUR Overview
An Arm Cortex-A5 MPU is a microprocessor unit based on the ARMv7-A architecture that integrates a CPU core, memory controllers, and rich peripherals into a single package. In the embedded hierarchy it sits above microcontrollers (MCUs) and is used when applications need a full operating system such as Linux, high-throughput peripherals like Gigabit Ethernet, or large DDR memories. The SAMA5D2 family specifically targets low-power connected IoT gateways, HMI panels, and industrial control.
Key features include the 500 MHz Cortex-A5 core with 32 KB each of L1 instruction and data cache plus 128 KB L2 SRAM, single-precision FPU, hardware video decoder/encoder accelerators, a 12-bit ADC, and a comprehensive peripheral set including Gigabit Ethernet, two CAN-FD controllers, USB host/device, and multiple UART/SPI/I2C interfaces. The 196-ball TFBGA package is a fine-pitch surface-mount BGA with thermal pad suitable for industrial PCB designs.
Architecturally, the device uses ARM's Cortex-A5 core paired with a multi-layer AHB/APB bus matrix and dedicated DMA engines. It supports secure boot via on-chip OTP and hardware crypto accelerators (AES, SHA, TRNG), enabling tamper-resistant firmware deployment. The integration of analog and digital peripherals reduces external component count in industrial designs.
Typical applications include industrial IoT gateways, building automation controllers, human-machine interface (HMI) panels, smart energy concentrators, and connected medical devices. The wide industrial temperature range makes it suitable for outdoor or factory-floor deployments.
When designing with this MPU, pay close attention to power-rail sequencing and decoupling. Place at least eight 100 nF decoupling capacitors near the BGA balls and provide a 4-layer PCB with continuous ground plane for DDR signal integrity. Validate boot configuration against the SAMA5D2 hardware design checklist.
This page synthesizes distributor stock levels, TFBGA-196 same-family alternatives, and practical PCB design notes beyond the manufacturer datasheet to accelerate your engineering decisions.
Drop-in alternatives for ATSAMA5D21A-CUR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATSAMA5D21A-CUR (same form factor and footprint) — differing in Package, Operating Temperature, Mounting Type, Backup Mode Current, Ethernet.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMA5D21B-CUR
✅ Drop-In✓ In Stock
$8.56 / Unit
View Datasheet →ATSAMA5D21C-CUR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$11.65 / Unit
View Datasheet →ATSAMA5D22A-CUR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$6.2 / Unit
View Datasheet →ATSAMA5D28A-CUR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$10.8 / Unit
View Datasheet →ATSAMA5D27A-CUR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$12.95 / Unit
View Datasheet →ATSAMA5D21A-CUR Maximum Ratings & Electrical Characteristics
| Core Architecture | Arm Cortex-A5 (ARMv7-A) |
| Maximum CPU Clock | 500 MHz |
| FPU | Single-precision hardware floating-point unit |
| L1 Cache | 32 KB instruction + 32 KB data |
| Internal SRAM | 128 KB |
| External Memory | DDR2/DDR3L/LPDDR2/LPDDR3, QSPI, e.MMC |
| Package | 196-ball TFBGA |
| Temperature Grade | Industrial (-40C to +85C) |
| Mounting Type | Surface Mount (BGA) |
| Ethernet | Gigabit Ethernet MAC |
| USB | USB 2.0 Host and Device |
| CAN | 2x CAN-FD controllers |
| ADC | 12-bit ADC |
| Crypto Accelerators | AES, SHA, TRNG |
| RoHS Status | Compliant |
ATSAMA5D21A-CUR 196-ball tfbga Pin Configuration Guide
Pin configuration for ATSAMA5D21A-CUR (196-ball tfbga package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATSAMA5D21A-CUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAMA5D21A-CUR is suitable for 6 applications: Industrial IoT Gateway, Building Automation Controller, Human-Machine Interface (HMI) Panel, Smart Energy Concentrator, Connected Medical Device Gateway, Edge Vision / Camera Sensor Hub.
Industrial IoT Gateway
The ATSAMA5D21A-CUR is well suited for industrial IoT gateways thanks to its 500 MHz Cortex-A5 with FPU and integrated Gigabit Ethernet MAC. The dual CAN-FD controllers let it aggregate data from factory-floor sensors while Linux4SAM provides the rich networking stack needed for MQTT, OPC-UA, and TLS. With 128 KB on-chip SRAM and an industrial -40C to +85C rating, the MPU handles protocol conversion and edge analytics without external memory pressure, dissipating typically 1 W under full load.
Recommended
Building Automation Controller
Building automation controllers benefit from the ATSAMA5D21A-CUR's combination of low-power Cortex-A5 with rich connectivity peripherals. Two CAN-FD buses aggregate HVAC and elevator sensors while Ethernet and Wi-Fi link to the building management system. The hardware AES/SHA accelerators secure BACnet/IP traffic. Industrial temperature rating supports rooftop or basement mounting, and the 196-ball TFBGA integrates into compact DIN-rail designs running embedded Linux distributions.
Recommended
Human-Machine Interface (HMI) Panel
The ATSAMA5D21A-CUR drives cost-optimized HMI panels where the integrated LCD controller (on the D22A sibling) can be used, and the D21A itself powers HMI logic with 500 MHz performance. The FPU accelerates Qt/embedded rendering while the DDR3L controller supports rich framebuffers. Industrial temperature operation is mandatory for factory-floor panels. Estimated system power is below 3 W for a 7-inch touchscreen HMI, enabling fanless enclosures.
Recommended
Smart Energy Concentrator
Smart energy concentrators aggregate meter data from multiple households or substations, a workload that fits the ATSAMA5D21A-CUR's profile. The hardware crypto accelerators authenticate DLMS/COSEM or M-Bus traffic while the dual CAN-FD buses interface with local submetering. The 128 KB SRAM plus DDR3L support large mesh routing tables, and the -40C to +85C range handles outdoor cabinet mounting. Estimated power budget is under 2 W in continuous operation.
Recommended
Connected Medical Device Gateway
Connected medical device gateways use the ATSAMA5D21A-CUR for HIPAA-compliant data aggregation. The hardware AES and TRNG support encrypted HL7/FHIR transmission over Ethernet. The Cortex-A5 with FPU runs real-time vital-sign analysis locally before cloud upload. Industrial temperature rating meets IEC 60601-1 environmental requirements for clinical environments, and the BGA package suits compact medical cart designs requiring long-term Microchip silicon availability.
Recommended
Edge Vision / Camera Sensor Hub
The ATSAMA5D21A-CUR functions as a sensor hub for low-resolution edge-vision nodes in industrial inspection. The Cortex-A5 with FPU runs lightweight CNN inference at 5-10 FPS for presence detection, while the camera interface and 12-bit ADC handle image sensor data. Linux4SAM enables easy deployment of ONNX-runtime models. Industrial temperature operation and Microchip's long-term supply program suit 10+ year industrial product lifecycles.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMA5D21A-CUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMA5D21B-CUR | ATSAMA5D21C-CUR | ATSAMA5D22A-CUR | ATSAMA5D27A-CUR | ATSAMA5D28A-CUR |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 196-ball TFBGA | 196-ball TFBGA - same | 196-ball TFBGA - same | 196-ball TFBGA - same | 196-ball TFBGA - same | 196-ball TFBGA - same |
| Core / Clock | Cortex-A5 / 500 MHz | Cortex-A5 / 500 MHz | Cortex-A5 / 500 MHz | Cortex-A5 / 500 MHz | Cortex-A5 / 500 MHz | Cortex-A5 / 500 MHz |
| Internal SRAM | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB |
| LCD Controller | No (D21A base) | No | No | Yes | Yes | Yes |
| CAN-FD Controllers | 2 | 2 | 2 | 2 | 2 (full feature set) | 2 |
| Gigabit Ethernet | Yes | Yes | Yes | Yes | Yes | Yes |
| Hardware Crypto | AES, SHA, TRNG | AES, SHA, TRNG | AES, SHA, TRNG (enhanced) | AES, SHA, TRNG | AES, SHA, TRNG | AES, SHA, TRNG |
| Silicon Revision | A | B | C | A | A | A |
Key Differentiators
- Same-family drop-in silicon revision (vs ATSAMA5D21B-CUR)
- Adds LCD controller without changing footprint (vs ATSAMA5D22A-CUR)
- Lower power than D31x/D4x family members (vs ATSAMA5D42A-CUR)
Design Notes
The ATSAMA5D21A-CUR requires multiple voltage rails (typically 1.2 V core, 1.8 V DDR, 3.3 V I/O). Sequence the rails according to the SAMA5D2 hardware design guide - VDDCORE must rise before or simultaneously with VDDIO. Estimated: with VIN=3.3 V at full 500 MHz load the MPU draws approximately 300-400 mA from the 1.2 V core rail, requiring a DC-DC converter rated for at least 1 A continuous.
Use a 4-layer PCB minimum with a continuous ground plane under the 196-ball TFBGA. Place at least eight 100 nF X7R decoupling capacitors within 2 mm of the BGA balls, plus a single 10 uF bulk capacitor per rail. Match DDR traces to within 0.1 mm and use 50 ohm controlled impedance. The exposed thermal pad must be soldered to a 5 mm x 5 mm copper pad with thermal vias to the inner plane.
Do not skip the boot-mode strap configuration on the BMS pin - the ATSAMA5D21A-CUR reads boot options at reset and incorrect strapping will prevent QSPI/DDR access. Ensure the 32.768 kHz crystal load capacitance matches the datasheet recommendation (12 pF typical). Estimated: oscillator start-up time is below 1 second with correct loading but can exceed 5 seconds with mismatched capacitance.
Compliance Information
Industrial-grade MPU. RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - choose ATSAMA5D2x-CNR variants only if automotive is required (not always available in 196-ball TFBGA).
