ATSAM4LS2BA-MUR - Cortex-M4 48MHz 128KB MCU | Microchip
MPN: ATSAM4LS2BA-MUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.6 | $7.60 |
| 10 | $6.95 | $69.50 |
| 100 | $6.25 | $625.00 |
| 500 | $5.8 | $2,900.00 |
| 1,000 | $5.4 | $5,400.00 |
ATSAM4LS2BA-MUR Overview
A microcontroller unit (MCU) is a single-chip computer that integrates a processor core, memory, and peripherals such as timers, serial interfaces, and analog converters into one integrated circuit. MCUs sit at the heart of embedded systems, below system-on-chip and application processor families in the computing hierarchy, and the SAM4L family belongs to Microchip (formerly Atmel) ATSAM ARM-based flash MCU product line.
Key features of the ATSAM4LS2BA-MUR include the ARM Cortex-M4 RISC processor with 48 MHz maximum frequency, 128 KB (128K x 8) of flash program memory, operation from 1.8V, 2.5V, or 3.3V supply rails, and an industrial temperature grade designation. The SAM4L series emphasizes ultra-low-power design with flexible power modes, making it suitable for battery-powered and energy-harvesting designs.
Technically, the Cortex-M4 core provides a 3-stage pipeline, hardware divide, and single-cycle multiply for efficient signal processing, while the SAM4L peripheral set typically includes multiple serial communication interfaces and analog peripherals, all clocked from a flexible clock controller supporting multiple sleep and wait modes for active power optimization.
Typical applications include industrial sensing nodes, consumer portable devices, building automation, and low-power IoT endpoints where the combination of 48 MHz Cortex-M4 performance and low active current is valuable.
A key design consideration is supply selection: the device supports 1.8V/2.5V/3.3V operation, so decoupling and power-tree planning should match the chosen rail, and the exposed pad must be soldered to a grounded PCB land pattern for thermal and electrical performance.
This page synthesizes distributor pricing, drop-in alternatives, comparison tables, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATSAM4LS2BA-MUR — 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 ATSAM4LS2BA-MUR (same form factor and footprint) — differing in Package, RoHS Status, SRAM, Supply Voltage, Packaging.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAM4LS2BA-MU
✅ Drop-In✓ In Stock
$3.79 / Unit
View Datasheet →ATSAM4LC2BA-MUR
✅ Drop-In✓ In Stock
$3.25 / Unit
View Datasheet →ATSAM4LS2AA-MU
✅ Drop-In✓ In Stock
$3.55 / Unit
View Datasheet →ATSAM4LS2CA-MUR
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATSAM4LS4BA-MUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.25 / Unit
View Datasheet →ATSAM4LS2BA-MUR Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M4 |
| Core Size | 32-Bit |
| Maximum Clock Frequency | 48 MHz |
| Flash Memory Size | 128 KB (128K x 8) |
| RAM Memory Size | 32 KB |
| Supply Voltage | 1.8V / 2.5V / 3.3V |
| Minimum Supply Voltage | 1.68 V |
| Package Type | 64-QFN (9x9 mm) Exposed Pad |
| Number of Pins / Terminals | 64 |
| Mounting Style | Surface Mount |
| Temperature Grade | Industrial |
| Packaging | Tape & Reel (T/R) |
| RoHS Status | Compliant (GREEN package) |
| Product Family | SAM4L (ATSAM ARM-based Flash MCU) |
| Data Bus Width | 32 bit |
| Program Memory Type | Flash |
ATSAM4LS2BA-MUR 64-qfn (9x9 mm) exposed pad Pin Configuration Guide
Pin configuration for ATSAM4LS2BA-MUR (64-qfn (9x9 mm) exposed pad 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 ATSAM4LS2BA-MUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAM4LS2BA-MUR is suitable for 6 applications: Industrial Sensing Nodes, Portable and Battery-Powered Devices, Building Automation and HVAC Control, Low-Power IoT Endpoints, Medical and Health Monitoring Devices, Consumer Appliances and White Goods.
Industrial Sensing Nodes
The ATSAM4LS2BA-MUR fits industrial sensing nodes because its 48 MHz ARM Cortex-M4 core provides enough headroom for local filtering and protocol stacks, while the SAM4L low-power architecture allows the node to sleep between measurement cycles to conserve energy. Its 128 KB flash accommodates a full sensor driver, communication stack, and calibration routines, and the 32 KB SRAM buffers sample data before transmission. The industrial temperature grade suits factory-floor environments, and the 1.8V-3.3V supply range interfaces directly with common sensor rails. In use, the MCU reads sensors via I2C or SPI, applies digital filtering on the Cortex-M4, and transmits results over RS-485 or wireless modules; the exposed-pad QFN-64 must be well grounded for reliable operation in electrically noisy industrial cabinets.
Recommended
Portable and Battery-Powered Devices
Battery-powered consumer and portable products benefit from the ATSAM4LS2BA-MUR because the SAM4L series was architected for ultra-low-power operation with multiple sleep and wait modes orchestrated by a flexible power controller, allowing the 48 MHz Cortex-M4 to run only during active processing bursts. Operation at 1.8V reduces active power compared to 3.3V designs, and 128 KB flash plus 32 KB SRAM is sufficient for user-interface code, sensor fusion, and Bluetooth LE or sub-GHz radio stacks. The 9x9 mm 64-QFN exposed-pad package keeps board area compact for handheld form factors. A typical design runs the MCU in a low-power sleep state between touch or sensor events, wakes on interrupt, processes, and returns to sleep; designers should verify datasheet sleep-mode currents at their chosen clock configuration to model battery life accurately.
Recommended
Building Automation and HVAC Control
In building automation, the ATSAM4LS2BA-MUR serves as a zone controller or sensor-head processor where its 48 MHz Cortex-M4 handles PID loops for dampers and valves, MODBUS or proprietary serial protocols, and sensor averaging algorithms. The industrial temperature grade tolerates rooftop and mechanical-room conditions, while the 128 KB flash stores control logic, schedules, and network firmware with update margin. Multiple serial interfaces in the SAM4L peripheral set connect to RS-485 transceivers, displays, and environmental sensors. Because HVAC controllers often run continuously, developers exploit SAM4L low-power idle modes during polling intervals to cut average consumption in battery-backup scenarios. Layout should route the exposed pad to a ground plane and keep the 3.3V rail well decoupled to maintain ADC accuracy for temperature and pressure measurements across the controller board.
Recommended
Low-Power IoT Endpoints
For IoT endpoint designs reporting over LPWAN or short-range radios, the ATSAM4LS2BA-MUR combines enough compute for payload encryption and JSON/CBOR formatting with the SAM4L family's power-optimized idle behavior, so the radio transmit burst is the dominant energy cost rather than the MCU. The 32 KB SRAM holds TLS session state for secure cloud connections, and 128 KB flash stores the stack plus over-the-air update staging. Its 1.68 V minimum supply allows direct operation from a single lithium cell via an LDO, simplifying the power tree. In a typical deployment the MCU wakes on a timer, samples sensors, encrypts, transmits, and sleeps; verify the datasheet active-mode current at 48 MHz versus reduced clock frequencies, since running slower at lower voltage can improve energy per task for non-time-critical reporting.
Recommended
Medical and Health Monitoring Devices
Portable health monitors use the ATSAM4LS2BA-MUR to acquire physiological signals, apply the Cortex-M4's DSP-oriented instructions to filtering tasks such as IIR/FIR conditioning of ECG or SpO2 waveforms, and manage displays or wireless telemetry. The SAM4L's low-power modes extend battery life in wearable form factors, while the 128 KB flash supports signal-processing libraries and calibration data. The 1.8V-capable supply range helps minimize power in implant-adjacent or long-wear accessories, and the compact 9x9 mm QFN-64 fits small PCBs behind sensor electrodes. Designers must respect medical EMC requirements: a solid ground plane under the MCU, careful exposed-pad soldering, and shielded analog front-end routing are essential. For certified products, select the appropriate SAM4L temperature variant and follow Microchip reliability guidance during qualification.
Recommended
Consumer Appliances and White Goods
Appliance control boards use the ATSAM4LS2BA-MUR as the human-interface and supervisory processor, where its 48 MHz Cortex-M4 drives capacitive-touch scanning, segment or TFT display updates, motor-control feedback loops, and communication with a main power board. The 128 KB flash holds the full UI state machine and fault logs, and the industrial temperature grade survives kitchen and laundry environments. The SAM4L peripheral set's multiple timers and serial channels interface with encoder inputs, EEPROM emulation in flash, and UART links. Because appliance boards prioritize unit cost, the 64-QFN exposed-pad package reduces board area and assembly cost with standard reflow processes; the GREEN RoHS package meets global consumer product environmental requirements. Layout should separate the MCU's analog references from motor-driver switching paths to preserve ADC accuracy.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM4LS2BA-MUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM4LS2BA-MU | ATSAM4LC2BA-MUR | ATSAM4LS2AA-MU | ATSAM4LS2CA-MUR |
|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) Exposed Pad | 64-QFN (9x9 mm) EP - same | 64-QFN (9x9 mm) EP - same | 64-QFN EP - same | 64-QFN (9x9 mm) EP - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Max Frequency | ARM Cortex-M4, 48 MHz | ARM Cortex-M4, 48 MHz | ARM Cortex-M4, 48 MHz | ARM Cortex-M4, 48 MHz | ARM Cortex-M4, 48 MHz |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB | 256 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| Supply Voltage Options | 1.8V / 2.5V / 3.3V | 1.8V / 2.5V / 3.3V | 1.8V / 2.5V / 3.3V | 1.8V / 2.5V / 3.3V | 1.8V / 2.5V / 3.3V |
| Packaging / Delivery | Tape & Reel (T/R) | Tray | Tape & Reel (T/R) | Tray | Tape & Reel (T/R) |
| Peripheral Emphasis | Standard SAM4L LS peripheral set | Standard SAM4L LS set (identical) | LC ultra-low-power peripheral set (verify) | Standard LS set, A grade | Standard LS set with larger flash |
Key Differentiators
- Identical-silicon drop-in with packaging flexibility (vs ATSAM4LS2BA-MU)
- Flash headroom upgrade on the same footprint (vs ATSAM4LS2CA-MUR)
- Standard peripheral set vs ultra-low-power variant (vs ATSAM4LC2BA-MUR)
- Cost-optimized memory tier (vs ATSAM4LS4BA-MUR)
Design Notes
The ATSAM4LS2BA-MUR supports 1.8V, 2.5V, and 3.3V rails with a minimum supply of 1.68 V per FindIC electrical data. Place one 100 nF X7R ceramic capacitor at each VDD/VDDIO pin pair, located within 2 mm of the pin, plus at least one 4.7 uF bulk capacitor per supply domain. If the design runs from a switching pre-regulator, add an LC filter or LDO between the buck output and the MCU rail, since Cortex-M4 supply ripple directly degrades ADC and analog-peripheral accuracy in the SAM4L family.
The 64-QFN 9x9 mm exposed pad is the primary ground and thermal path. Define an array of thermal vias (typically 4x4 to 5x5, 0.3 mm drill) under the pad connecting to the internal ground plane, and use a solder-paste stencil segmented to about 50-60% coverage to prevent voiding and device floating during reflow. Verify the pad-to-land-pattern dimensions against the Microchip package drawing in the SAM4L family datasheet before releasing the footprint.
SAM4L parts multiplex many functions onto the 64 pins; never assume a pinout from summary diagrams - check the full pin multiplexing tables in the family datasheet for your chosen peripheral set before routing. Also confirm the exact flash size in firmware linker settings when substituting family variants: the drop-in ATSAM4LS2CA-MUR provides 256 KB flash versus 128 KB, and a linker script written for 128 KB will silently waste the extra memory of the larger part.
Compliance Information
Mouser listing describes the package as 'QFN, GREEN, IND TEMP, MRL A, T&R' - GREEN denotes Microchip lead-free, halogen-free RoHS-compliant packaging. REACH and conflict-minerals status not stated in provided data.
