ATSAM4S2AA-MU - 120MHz Cortex-M4 MCU 128KB Flash | Microchip
MPN: ATSAM4S2AA-MU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.67 | $1.67 |
| 10 | $1.55 | $15.50 |
| 100 | $1.42 | $142.00 |
| 500 | $1.31 | $655.00 |
| 1,000 | $1.22 | $1,220.00 |
ATSAM4S2AA-MU Overview
A microcontroller (MCU) is a single-chip computer that integrates a processor core, memory (FLASH and SRAM), and peripherals such as UARTs, SPI, I2C, ADCs and timers on one die. Within the hierarchy of embedded processors, the SAM4S sits above entry-level Cortex-M0+ parts and offers DSP instructions and a single-cycle multiply-accumulate unit inherited from the Cortex-M4 architecture, making it suitable for digitally intensive control loops and signal processing.
Key features include the 120 MHz Cortex-M4 core with hardware floating-point support in the SAM4S family architecture, 128 KB of on-chip FLASH for program storage, pin-to-pin compatibility across the SAM4S, SAM4N, SAM3S, SAM3N and SAM7S series (48-, 64- and 100-pin versions), and an industrial temperature grade option. The MRL-A (Moisture Requirement Level A) green QFN package supports lead-free reflow assembly and RoHS-type green compliance per Microchip's GREEN package designation shown by distributors.
Architecturally, the SAM4S family combines the Cortex-M4 core with a multi-layer bus matrix, enabling parallel peripheral access and efficient DMA transfers. The shared peripheral set across memory-density variants means firmware developed for the 128 KB ATSAM4S2A migrates directly to higher-density siblings by relinking, without board changes thanks to pin-to-pin compatibility.
Typical applications include industrial control and automation nodes, motor control and power-conversion systems, consumer devices, and embedded IoT gateways where 120 MHz headroom and hardware multiply-accumulate improve control-loop and filtering performance.
When designing, budget code size carefully: 128 KB FLASH is adequate for most control and communication stacks but not for graphics-heavy firmware; plan migration headroom using the pin-compatible ATSAM4S4A density variant.
This page synthesizes distributor pricing (LCSC, DigiKey, Mouser), same-family drop-in alternatives, and practical design guidance not found in the manufacturer datasheet alone.
Drop-in alternatives for ATSAM4S2AA-MU — 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 ATSAM4S2AA-MU (same form factor and footprint) — differing in Operating Temperature, Package, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAM4S4AA-MU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.79 / Unit
View Datasheet →ATSAM3S2AA-MU
✅ Drop-In✓ In Stock
$3.6 / Unit
View Datasheet →ATSAM3S4AA-MU
✅ Drop-In✓ In Stock
$3.85 / Unit
View Datasheet →ATSAM3N4AA-MU
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →ATSAM4S2AA-MU Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M4 |
| Core Size | 32-Bit |
| Max Clock Frequency | 120 MHz |
| Program Memory (FLASH) | 128 KB (128K x 8) |
| Series | SAM4S |
| Operating Temperature | Industrial grade (-40C to +85C per Mouser IND TEMP listing) |
| Package | 48-QFN (7x7 mm) |
| Mounting Type | Surface Mount |
| Package Green Status | GREEN, MRL-A (Moisture Requirement Level A) |
| Pin-to-Pin Compatibility | SAM4N, SAM3S, SAM3N, SAM7S (48-, 64-, 100-pin versions) |
| RoHS Status | Compliant (GREEN package per Mouser listing) |
| Number of Terminals | 48 |
| Package Shape | Square HVQCCN |
ATSAM4S2AA-MU square hvqccn Pin Configuration Guide
Pin configuration for ATSAM4S2AA-MU (square hvqccn 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 ATSAM4S2AA-MU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAM4S2AA-MU is suitable for 6 applications: Industrial Control and Automation, Motor Control and Power Conversion, Embedded IoT Gateways and Sensor Nodes, Consumer Appliance Control Boards, Test and Measurement Instruments, Building Automation and HVAC Controllers.
Industrial Control and Automation
The ATSAM4S2AA-MU fits industrial control nodes where deterministic processing and multiple communication interfaces are required. Its 120 MHz Cortex-M4 core executes PID control loops and protocol stacks concurrently, while 128 KB FLASH accommodates PLC-style ladder interpretation, Modbus RTU/TCP framing, or CAN-based fieldbus firmware. In a typical installation, the MCU sequences relays, samples analog sensor channels through its on-chip ADC, and reports status over RS-485 or Ethernet via an external MAC-PHY. The industrial temperature grade and GREEN MRL-A QFN package support harsh-panel and DIN-rail module assembly. Because the SAM4S series is pin-to-pin compatible with SAM3S and SAM3N parts, one PCB design can span cost-optimized (M3) and performance-optimized (M4) product tiers, reducing qualification effort across a controller portfolio.
Recommended
Motor Control and Power Conversion
Motor drives and digital power converters benefit from the ATSAM4S2AA-MU's 120 MHz Cortex-M4 core with single-cycle multiply-accumulate instructions, which accelerate Clarke/Park transforms and current-loop filters used in field-oriented control. The SAM4S peripheral complement includes PWM generation and ADC triggering for power-stage commutation; designers should confirm exact PWM channel and ADC sample-rate figures in the SAM4S datasheet against the inverter topology. The 128 KB FLASH holds sensorless-observer code, protection state machines, and communication (typically UART or CAN to a host). Running the control interrupt at 10-20 kHz leaves ample CPU margin for host communications. The 48-QFN 7x7 mm footprint keeps the controller physically close to gate drivers, shortening analog sense routing on compact power boards.
Recommended
Embedded IoT Gateways and Sensor Nodes
The ATSAM4S2AA-MU serves as the main controller in IoT sensor nodes and small gateways that aggregate analog and digital sensor data and push it upstream over UART, SPI, or I2C-connected radio modules. The 120 MHz core provides headroom for sensor-fusion math, CRC/checksum computation, and TLS-style pre-processing that exceeds the capability of Cortex-M0+ nodes, while 128 KB FLASH typically suffices for a sensor application plus a serial bootloader for field firmware updates. Its industrial temperature grade suits outdoor and unconditioned enclosures. Designers commonly pair it with a low-power radio transceiver and use the SAM4S DMA channels to move ADC samples without CPU intervention, reducing active-current duty cycle in battery-backed deployments where sleep-time dominance determines battery life.
Recommended
Consumer Appliance Control Boards
Home appliances such as coffee machines, air purifiers, and small cooking devices use the ATSAM4S2AA-MU to drive user interfaces, manage heater or motor loads, and implement safety interlocks. The 120 MHz performance supports capacitive-touch sensing, segmented LCD driving through external drivers, and buzzer tone generation while the control loop runs, all within the 128 KB FLASH budget typical of appliance firmware. The GREEN MRL-A QFN package meets lead-free mass-production assembly requirements for high-volume consumer lines. Cost matters in this segment, so the pin-compatible ATSAM3S2AA-MU offers a down-cell option when M4 DSP features are unnecessary, letting one PCB carry either controller depending on feature tier - a proven SAM-family cost-optimization strategy documented by Microchip's series compatibility notes.
Recommended
Test and Measurement Instruments
Handheld meters, bench sub-instruments, and data loggers use the ATSAM4S2AA-MU where its 120 MHz Cortex-M4 accelerates numeric processing: RMS windowing, calibration-table interpolation, and DSP filtering of ADC streams. The single-cycle MAC and hardware divide support productive DSP-class math without an external coprocessor, and 128 KB FLASH typically hosts measurement firmware plus a USB or UART command interface. In a typical signal chain the SAM4S polls a precision ADC over SPI using DMA, applies digital filtering in fixed point, and formats results to a display driver. Migration headroom matters in instruments because features accrete; the pin-compatible ATSAM4S4AA-MU doubles-class memory without layout change, protecting the hardware investment across product revisions.
Recommended
Building Automation and HVAC Controllers
The ATSAM4S2AA-MU suits zone controllers, damper actuators, and HVAC board-level controllers that must run communication stacks (Modbus, BACnet-MS/TP over UART) alongside sensor acquisition and actuator timing. The 120 MHz core sustains these concurrent tasks with deterministic interrupt latency, and 128 KB FLASH accommodates protocol stacks plus a compensation or schedule engine. The industrial temperature grade covers rooftop and mechanical-room environments, and the GREEN QFN package aligns with RoHS-driven building-electronics specifications. A key design benefit is series longevity: because SAM4S is pin-to-pin compatible with SAM3S/SAM3N/SAM7S in 48-pin packages, building controllers can be re-sourced across memory densities or core generations during supply disruptions without re-qualifying the PCB layout.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM4S2AA-MU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM4S4AA-MU | ATSAM4S2BA-MU | ATSAM3S2AA-MU | ATSAM3N4AA-MU |
|---|---|---|---|---|---|
| Package | 48-QFN (7x7 mm) | 48-QFN (7x7 mm) - same | 64-QFN - differs | 48-QFN (7x7 mm) - same | 48-QFN (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M3 | ARM Cortex-M3 |
| FLASH | 128 KB | 256 KB (SAM4S4 tier) | 128 KB | 128 KB (SAM3S2 tier) | 256 KB (SAM3N4 tier) |
| Pin Compatibility with ATSAM4S2AA-MU | Reference | Yes - same 48-pin map | No - 64-pin | Yes - per datasheet 60001419B | Yes - per datasheet 60001419B |
Key Differentiators
- Cortex-M4 DSP capability at 120 MHz (vs ATSAM3S2AA-MU)
- Same-footprint migration to double flash (vs ATSAM4S4AA-MU)
- Broader supply-chain fallback than single-core dependency (vs ATSAM3N4AA-MU)
Design Notes
The ATSAM4S2AA-MU uses a 48-QFN (7x7 mm) exposed-pad package. Connect the center thermal pad to a solid ground plane through an array of thermal vias (typically 4-9 vias) to provide both electrical ground return and heat dissipation. Follow Microchip's QFN land-pattern recommendation for solder-mask-defined versus non-solder-mask-defined pads; a 0.5 mm pitch layout requires careful stencil design (typically ~65-75% pad coverage) to avoid bridging. Verify the exact land-pattern dimensions in the SAM4S datasheet package section before releasing the PCB fabrication package.
Provide clean decoupling for all VDD/VDDIO pins: place 100 nF ceramic capacitors within 2-3 mm of each supply pin, plus bulk capacitance (4.7-10 uF) near the regulator output. Confirm the exact supply voltage range in the SAM4S family datasheet before selecting the LDO or buck converter feeding the MCU. If the design will later migrate to pin-compatible SAM4S/SAM3S variants, keep the supply solution within the intersection of family voltage ratings so a relink-only migration remains possible. Add a series ferrite for VDDIO if noisy actuators share the supply rail.
Two frequent SAM4S design pitfalls: (1) FLASH sizing - 128 KB fills quickly with a USB stack, RTOS, and OTA bootloader; design the schematic pin-compatible with the ATSAM4S4AA-MU (same 48-QFN footprint) so a flash upgrade needs no PCB change. (2) Peripheral multiplexing - SAM4S pins carry multiple functions selected by the PIO controller; verify each pin's mux assignment in the datasheet pinout tables during schematic capture, not after layout, because conflicting mux choices on the 48-pin package are the most common re-spin cause.
Compliance Information
Mouser lists the part as 'QFN,GREEN,IND TEMP,MRL A' - Microchip GREEN designation indicates RoHS-compliant lead-free packaging. Formal REACH and conflict-minerals declarations should be obtained from Microchip's compliance portal.
