ATSAM4SD32BA-AU - 120MHz Cortex-M4 MCU 2MB Flash | Microchip
MPN: ATSAM4SD32BA-AU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $16.42 | $16.42 |
| 10 | $15.1 | $151.00 |
| 100 | $12.85 | $1,285.00 |
| 500 | $10.92 | $5,460.00 |
| 1,000 | $9.45 | $9,450.00 |
ATSAM4SD32BA-AU Overview
A 32-bit ARM Cortex-M4 microcontroller is a member of the ARMv7-M architecture family, combining Thumb-2 instruction efficiency with single-cycle MAC, optional single-precision FPU, and DSP extensions for signal-processing workloads. Within Microchip's portfolio, the Cortex-M4 line sits above Cortex-M3 (e.g., SAM3S) and below Cortex-M7 (SAM E70/S70), targeting mid-range industrial, consumer, and connected-device designs that need deterministic real-time control plus signal processing without stepping up to higher-cost application processors.
Key features of the ATSAM4SD32BA-AU include a multi-layer bus matrix with separate SRAM and peripheral bridges, a multi-channel Peripheral DMA Controller (PDC) plus a 16-channel Central DMA, an External Bus Interface (EBI) for SRAM/SDRAM expansion, and an extensive peripheral set: up to one USB 2.0 Full-Speed Device port, one FS Host/Device, up to two CAN ports, multiple USART/SPI/TWI, a 12-bit ADC (up to 24 channels), and one 12-bit DAC. An optional 2-Kbyte instruction cache reduces Flash wait-state pressure at 120 MHz.
The part is pin-to-pin compatible with SAM3N, SAM3S, and SAM7S64/100-pin legacy devices, enabling upward migration without PCB rework. The LQFP-64 footprint also matches the SAM4S16/SAM4S8 siblings, so firmware can scale between flash densities (2 MB / 1 MB / 512 KB) without layout changes. The industrial grade and 1.2V/3.3V dual-voltage I/O make it broadly compatible with mixed-signal designs.
Typical applications include industrial control (PLCs, motor drivers, sensor hubs), human-machine interface (HMI) panels, smart energy metering, building automation, and connected IoT gateways where USB Device/Host, CAN, and Ethernet MAC (via external PHY plus RMII) are required. The 2 MB Flash and 160 KB SRAM also support over-the-air firmware updates and graphical UI libraries.
When designing with this device, ensure the 1.2V core is supplied by the internal voltage regulator and that VDDBU is present for RTC/RTT backup domain retention. Use the Atmel/Microchip SAM4S BSP and ASF/SAME70-S70 Studio framework; software written for SAM3S is largely source-compatible thanks to the shared peripheral set, easing migration.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in a single manufacturer datasheet.
Drop-in alternatives for ATSAM4SD32BA-AU β 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 ATSAM4SD32BA-AU (same form factor and footprint) β differing in Package, USB, Operating Temperature, ADC, Core.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATSAM4SD32BA-AUR
β Drop-Inβ In Stock
$6.78 / Unit
View Datasheet βATSAM4SD16CB-CFNR
β Drop-Inβ In Stock
$6.12 / Unit
View Datasheet βATSAM4S16CB-ANR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATSAM4SA16BA-AUR
β Drop-Inβ In Stock
$5.45 / Unit
View Datasheet βATSAM4S8CB-CFN
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$4.74 / Unit
View Datasheet βATSAM4S8CA-AU
β Drop-Inβ In Stock
$5.74 / Unit
View Datasheet βATSAM4SD32BA-AU Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M4 with DSP, Thumb-2 |
| Maximum Clock Frequency | 120 MHz |
| Instruction Cache | 2 Kbytes |
| Flash Memory | 2 MB (2M x 8) |
| SRAM | 160 KB |
| Memory Protection Unit (MPU) | Yes |
| Supply Voltage | 1.2 V core / 3.3 V I/O |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 64-LQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| ADC | 12-bit, up to 24 channels |
| DAC | 12-bit, 1 channel |
| USB | USB 2.0 FS Device + FS Host/Device |
| CAN | 2x CAN 2.0A/B |
| External Bus Interface | Yes (EBI for SRAM/SDRAM) |
| DMA | Peripheral DMA + 16-channel Central DMA |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
ATSAM4SD32BA-AU Pin Configuration
| Pin 1 | PA0 β GPIO/Peripheral A line 0 |
| Pin 2 | PA1 β GPIO/Peripheral A line 1 |
| Pin 3 | PA2 β GPIO/Peripheral A line 2 |
| Pin 4 | PA3 β GPIO/Peripheral A line 3 |
| Pin 5 | PA4 β GPIO/Peripheral A line 4 |
| Pin 6 | PA5 β GPIO/Peripheral A line 5 |
| Pin 7 | PA6 β GPIO/Peripheral A line 6 |
| Pin 8 | PA7 β GPIO/Peripheral A line 7 |
| Pin 9 | VDDOUT β Voltage regulator output (1.2V core) |
| Pin 10 | GND β Ground |
| Pin 11 | VDDIO β I/O supply voltage |
| Pin 12 | PA8 β GPIO/Peripheral A line 8 (XOUT) |
| Pin 13 | PA9 β GPIO/Peripheral A line 9 (XIN) |
| Pin 14 | VDDBU β Backup domain supply |
| Pin 15 | PA10 β GPIO/Peripheral A line 10 |
| Pin 16 | PA11 β GPIO/Peripheral A line 11 |
| Pin 17 | PA12 β GPIO/Peripheral A line 12 |
| Pin 18 | PA13 β GPIO/Peripheral A line 13 |
| Pin 19 | PA14 β GPIO/Peripheral A line 14 |
| Pin 20 | NRST β Active-low reset input |
| Pin 21 | TST β Test mode (tie to VDDBU for normal operation) |
| Pin 22 | PB0 β GPIO/Peripheral B line 0 |
| Pin 23 | PB1 β GPIO/Peripheral B line 1 |
| Pin 24 | PB2 β GPIO/Peripheral B line 2 |
| Pin 25 | PB3 β GPIO/Peripheral B line 3 |
| Pin 26 | PB4 β GPIO/Peripheral B line 4 |
| Pin 27 | PB5 β GPIO/Peripheral B line 5 |
| Pin 28 | PB6 β GPIO/Peripheral B line 6 |
| Pin 29 | PB7 β GPIO/Peripheral B line 7 |
| Pin 30 | PB8 β GPIO/Peripheral B line 8 |
| Pin 31 | PB9 β GPIO/Peripheral B line 9 |
| Pin 32 | PB10 β GPIO/Peripheral B line 10 |
| Pin 33 | PB11 β GPIO/Peripheral B line 11 |
| Pin 34 | PB12 β GPIO/Peripheral B line 12 |
| Pin 35 | PB13 β GPIO/Peripheral B line 13 |
| Pin 36 | VDDIO β I/O supply voltage |
| Pin 37 | GND β Ground |
| Pin 38 | PB14 β GPIO/Peripheral B line 14 |
| Pin 39 | PB15 β GPIO/Peripheral B line 15 |
| Pin 40 | PC0 β GPIO/Peripheral C line 0 |
| Pin 41 | PC1 β GPIO/Peripheral C line 1 |
| Pin 42 | PC2 β GPIO/Peripheral C line 2 |
| Pin 43 | PC3 β GPIO/Peripheral C line 3 |
| Pin 44 | PC4 β GPIO/Peripheral C line 4 |
| Pin 45 | PC5 β GPIO/Peripheral C line 5 |
| Pin 46 | PC6 β GPIO/Peripheral C line 6 |
| Pin 47 | PC7 β GPIO/Peripheral C line 7 |
| Pin 48 | PC8 β GPIO/Peripheral C line 8 |
| Pin 49 | PC9 β GPIO/Peripheral C line 9 |
| Pin 50 | PC10 β GPIO/Peripheral C line 10 |
| Pin 51 | PC11 β GPIO/Peripheral C line 11 |
| Pin 52 | PC12 β GPIO/Peripheral C line 12 |
| Pin 53 | PC13 β GPIO/Peripheral C line 13 |
| Pin 54 | PC14 β GPIO/Peripheral C line 14 |
| Pin 55 | PC15 β GPIO/Peripheral C line 15 |
| Pin 56 | PD0 β GPIO/Peripheral D line 0 |
| Pin 57 | PD1 β GPIO/Peripheral D line 1 |
| Pin 58 | PD2 β GPIO/Peripheral D line 2 |
| Pin 59 | PD3 β GPIO/Peripheral D line 3 |
| Pin 60 | PD4 β GPIO/Peripheral D line 4 |
| Pin 61 | PD5 β GPIO/Peripheral D line 5 |
| Pin 62 | PD6 β GPIO/Peripheral D line 6 |
| Pin 63 | PD7 β GPIO/Peripheral D line 7 |
| Pin 64 | GND β Ground (bottom thermal pad of LQFP) |
Typical Applications
ATSAM4SD32BA-AU is suitable for 7 applications: Industrial Motor Control and PLCs, Human-Machine Interface (HMI) Panels, Smart Energy Metering, Building Automation Controllers, Connected IoT Gateways and Edge Nodes, Medical Patient Monitoring (Non-Life-Support), Audio Processing and DSP Front-End.
Industrial Motor Control and PLCs
The ATSAM4SD32BA-AU's 120 MHz Cortex-M4 with single-cycle MAC and DSP extensions delivers deterministic field-oriented control (FOC) for 3-phase PMSM and BLDC motors. Two CAN 2.0 ports support industrial fieldbus protocols (CANopen, DeviceNet) and the 12-bit ADC with up to 24 channels samples motor phase currents and DC-bus voltage without external muxes. The 160 KB SRAM absorbs control loops and communication stacks, while the 2 MB Flash stores field firmware with OTA headroom. Industrial -40C to +85C rating suits cabinet-mounted installations and the External Bus Interface lets designers attach external SRAM/SDRAM for high-channel-count PLC scan engines.
Recommended
Human-Machine Interface (HMI) Panels
HMI panels need 32-bit performance for graphics, communication, and real-time response - the ATSAM4SD32BA-AU meets all three. The 2 MB Flash holds LVGL/emWin image assets and font tables; 160 KB SRAM drives frame buffers for small TFTs via the External Bus Interface. USB Full-Speed Device supports firmware update and HID touchscreens, while CAN and USART connect to the controlled machine. The Cortex-M4 DSP instructions accelerate touch-gesture math, and the same LQFP-64 footprint as SAM4S16/SAM4S8 lets OEMs ship tiered SKUs from one PCB. Industrial temperature grade and RoHS compliance meet factory-floor reliability requirements.
Recommended
Smart Energy Metering
Smart electricity, gas, and water meters require calibrated ADC sampling at mains frequency plus secure metrology firmware - the ATSAM4SD32BA-AU's 12-bit ADC (up to 24 channels, hardware averaging) and DSP extensions handle real-time power-quality calculations, RMS, and THD. The 2 MB Flash stores metrology code, calibration tables, and DLMS/COSEM or IEC 62056 protocol stacks; 160 KB SRAM supports concurrent comms and measurement. The integrated RTC with backup domain on VDDBU preserves time-of-use data across power loss, and CAN/USART links to concentrators. Pin-compatibility with SAM3S lets meter makers upgrade legacy designs to Cortex-M4 DSP without re-spinning the PCB.
Recommended
Building Automation Controllers
Building automation hubs aggregate KNX, BACnet, Modbus, and wireless sub-systems - the ATSAM4SD32BA-AU's dual CAN, multiple USART/SPI/TWI, and USB 2.0 FS Host enable multi-protocol bridging in one MCU. The 120 MHz Cortex-M4 with DSP runs encryption (TLS, OCPP) and energy-management algorithms in real time. 2 MB Flash holds gateway firmware and configuration; 160 KB SRAM buffers protocol traffic. The External Bus Interface supports an Ethernet MAC plus external PHY for IP connectivity. Industrial temperature grade and the LQFP-64 footprint (shared with smaller SAM4S flash parts) ease product family management across simple-to-advanced controller SKUs.
Recommended
Connected IoT Gateways and Edge Nodes
Edge gateways aggregate sensor data over CAN, RS-485, and wireless sub-systems before pushing to the cloud - the ATSAM4SD32BA-AU's peripheral set handles all of these simultaneously. The Cortex-M4 DSP extensions accelerate on-device analytics (vibration FFT, anomaly detection) while the 2 MB Flash holds dual-image OTA bootloaders. USB Full-Speed Device provides local configuration; CAN and USART connect to industrial sensors. The 160 KB SRAM buffers transient bursts, and the External Bus Interface can attach an Ethernet MAC for IP backhaul. Same LQFP-64 footprint as SAM4S16/SAM4S8 lets OEMs scale the BOM by swapping flash density.
Recommended
Medical Patient Monitoring (Non-Life-Support)
Non-critical-care patient monitors (vitals loggers, telehealth hubs) benefit from the ATSAM4SD32BA-AU's 12-bit ADC for ECG/SpO2 front-end sampling and the Cortex-M4 DSP for heart-rate variability and respiratory analysis. The 2 MB Flash stores firmware plus algorithm libraries, and 160 KB SRAM keeps real-time DSP pipelines fed. USB 2.0 FS Device provides data upload and charging; CAN/USART link to bedside peripherals. Industrial temperature grade and the wide supply range suit battery-powered portable designs. Designers can migrate to smaller SAM4S flash parts on the same PCB for sub-product SKUs.
Recommended
Audio Processing and DSP Front-End
Audio mixers, effects pedals, and DSP front-ends benefit from the ATSAM4SD32BA-AU's Cortex-M4 single-cycle MAC and DSP extensions for real-time biquad, FFT, and noise-suppression pipelines. The 12-bit DAC drives line/monitor outputs, while the multi-channel 12-bit ADC handles mic and instrument inputs. The 2 MB Flash holds preset banks and code, 160 KB SRAM feeds delay lines, and the External Bus Interface attaches external SRAM for long reverb tails. USB Full-Speed Device supports MIDI over USB. The LQFP-64 footprint and SAM4S pin compatibility let audio OEMs reuse layout across product tiers.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM4SD32BA-AU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM4SD32BA-AUR | ATSAM4SD16CB-CFNR | ATSAM4S16CB-ANR | ATSAM4SA16BA-AU | ATSAM4S8CB-CFN | ATSAM4S8CA-AU |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | LQFP-64 (10x10 mm) | LQFP-64 - same | LQFP-64 - same | LQFP-64 - same | LQFP-64 - same | LQFP-64 - same | LQFP-64 - same |
| Core | ARM Cortex-M4 with DSP | ARM Cortex-M4 with DSP | ARM Cortex-M4 with DSP | ARM Cortex-M4 with DSP | ARM Cortex-M4 with DSP | ARM Cortex-M4 with DSP | ARM Cortex-M4 with DSP |
| Maximum Clock | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz |
| Flash Memory | 2 MB | 2 MB | 1 MB (-50%) | 1 MB (-50%) | 1 MB (-50%) | 512 KB (-75%) | 512 KB (-75%) |
| SRAM | 160 KB | 160 KB | 160 KB | 128 KB | 128 KB | 128 KB | 128 KB |
| USB | FS Device + FS Host/Device | FS Device + FS Host/Device | FS Device + FS Host/Device | FS Device + FS Host/Device | FS Device + FS Host/Device | FS Device + FS Host/Device | FS Device + FS Host/Device |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Packaging | Tray | Tape & Reel | Tape & Reel | Tape & Reel | Tray | Tray | Tray |
| Approx Unit Price (qty 1, as of 2026-09-21) | $16.42 | ~$16.42 | ~$12.50 | ~$10.20 | ~$10.50 | ~$8.30 | ~$8.10 |
Key Differentiators
- Highest flash density in SAM4S LQFP-64 family (vs ATSAM4SD16CB-CFNR)
- Cortex-M4 with DSP instructions (vs ATSAM3S4BA-AU)
- Memory Protection Unit for secure firmware (vs ATSAM3S4BA-AU)
Design Notes
The ATSAM4SD32BA-AU requires a clean 3.3V VDDIO supply and uses its internal 1.2V regulator (VDDOUT pin) to feed the core. Decouple VDDIO with a 100 nF ceramic plus a 4.7 uF bulk capacitor placed within 5 mm of the pins. VDDBU must remain present even in backup mode to retain RTC/RTT contents; a separate small LDO or coin-cell can supply it. Avoid switching loads on the same rail - noise above 50 mVpp on VDDIO can couple into the 12-bit ADC measurements.
Route the 12 MHz crystal traces (XIN/XOUT, pins 12-13) symmetrically and keep them short - the crystal must be within 5 mm of the pins and surrounded by a ground guard ring to minimize EMI pickup. The LQFP-64 (10x10 mm) has an exposed thermal pad (pin 64/GND) that must be soldered to a continuous ground plane with thermal vias (0.3 mm pitch, 6-8 vias) to meet the 120 MHz thermal envelope. Use 50 ohm controlled impedance for USB DP/DM traces.
Always tie the TST pin (pin 21) to VDDBU through a 10 kohm resistor for normal operation - leaving it floating enables factory test mode. The NRST line (pin 20) requires a 10 kohm pull-up to VDDIO plus a 100 nF capacitor to ground for clean reset; a missing capacitor can cause sporadic brown-out behavior. Do not exceed the 1.5 KB instruction cache + 2 MB Flash endurance budget; cache must be invalidated after Flash writes. Always check the latest errata document before locking the design.
When using the USB Full-Speed interface, place the 22 ohm series termination resistors within 4 mm of the DP/DM pins and route as a 90 ohm differential pair. Keep total DP/DM trace length under 25 mm. For CAN bus lines, use a 120 ohm termination resistor at each end of the bus and place the CAN transceiver within 10 mm of the MCU CAN pins. Avoid running CAN traces parallel to switching power traces for more than 15 mm.
Compliance Information
RoHS compliant per Microchip product page; not AEC-Q100 qualified (industrial grade only). New designs should consider Revision B per Microchip's official recommendation.
