ATSAM4LS4BA-MU - 48MHz Cortex-M4 256KB MCU | Microchip
MPN: ATSAM4LS4BA-MU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.41 | $2.41 |
| 10 | $2.29 | $22.90 |
| 100 | $2.12 | $212.00 |
| 500 | $1.98 | $990.00 |
| 1,000 | $1.85 | $1,850.00 |
ATSAM4LS4BA-MU Overview
A microcontroller (MCU) is a complete computing system on a single chip, integrating a processor core, program memory, data memory, and peripheral functions such as timers, communication interfaces, and analog converters. Within the power-management hierarchy, an MCU like the SAM4L often acts as the master controller of a system, coordinating sensors, power management ICs, and communication devices. The ARM Cortex-M4 core adds DSP instructions and hardware floating-point capability to the widely used 32-bit MCU ecosystem.
Key features of the ATSAM4LS4BA-MU include the SAM4L series focus on ultra-low power consumption, a 48 MHz maximum core clock, 256 KB of on-chip flash, 32 KB of SRAM, and an industrial operating temperature range, as confirmed by DigiKey and Mouser distributor listings. The 64-QFN no-lead package supports compact surface-mount designs with good thermal performance via the exposed pad.
Technically, the device combines the ARMv7E-M architecture with Microchip (formerly Atmel) peripheral IP from the SAM4L family, offering a 32-bit RISC datapath, nested vectored interrupt controller, and multiple low-power sleep modes. The flash-based program memory allows in-system reprogramming, and the 3.3 V supply class simplifies integration with modern sensors and transceivers.
Typical applications include industrial control panels, battery-powered metering and IoT sensor nodes, and consumer appliances that need a balance of DSP-class performance and low standby power. The Cortex-M4 core handles digital filtering and control loops efficiently, while the flash and SRAM capacity suits protocol stacks and small RTOS kernels.
When designing with this MCU, budget supply decoupling and PCB thermal relief on the exposed pad early, and verify that 256 KB flash meets final firmware size including a bootloader and OTA margin.
This page synthesizes distributor pricing, drop-in alternatives within the SAM4L family, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for ATSAM4LS4BA-MU 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 ATSAM4LS4BA-MU (same form factor and footprint) β differing in RoHS Status, Package, Flash Memory, Operating Temperature, Supply Voltage.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATSAM4LS4AA-MU
β Drop-Inβ In Stock
$3.95 / Unit
View Datasheet βATSAM4LS4BA-MU-ES
β Drop-Inπ Reference alternative (not in catalog)
ATSAM4LS2BA-MUR
β Drop-Inβ In Stock
$5.4 / Unit
View Datasheet βATSAM4LS8BA-MUR
β Drop-Inπ Reference alternative (not in catalog)
ATSAM4LC4BA-MU
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$1 / Unit
View Datasheet βATSAM4LS4BA-MU Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M4 |
| Core Size | 32-Bit |
| Maximum Clock Speed | 48 MHz |
| Flash Memory | 256 KB (256K x 8) |
| SRAM | 32 KB |
| Supply Voltage | 3.3 V |
| Package | 64-QFN (9x9 mm) |
| Mounting Type | Surface Mount |
| Temperature Grade | Industrial |
| Series | SAM4L |
| RoHS Status | Compliant (GREEN per Mouser listing) |
ATSAM4LS4BA-MU 64-qfn (9x9 mm) Pin Configuration Guide
Pin configuration for ATSAM4LS4BA-MU (64-qfn (9x9 mm) 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 ATSAM4LS4BA-MU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAM4LS4BA-MU is suitable for 6 applications: Battery-Powered IoT Sensor Nodes, Industrial Control and Automation, Smart Metering, Human Interface and Touch Control Panels, Medical and Portable Diagnostic Devices, Consumer Appliances and White Goods.
Battery-Powered IoT Sensor Nodes
The ATSAM4LS4BA-MU fits battery-powered IoT nodes because the SAM4L family is engineered by Microchip for ultra-low-power operation while still providing a 48 MHz Cortex-M4 core with DSP instructions for sensor filtering and encryption workloads. In a typical node, the MCU samples sensors over TWI/SPI, applies digital filtering in short active bursts, then enters a low-power sleep mode between transmissions. The 256 KB flash accommodates a full protocol stack plus an OTA bootloader with dual-image staging, and the 32 KB SRAM buffers radio payloads. The 3.3 V, 64-QFN (9x9 mm) package keeps the PCB footprint compact for coin-cell or Li-SOCl2 powered designs where average current, not peak performance, determines battery life.
Recommended
Industrial Control and Automation
In industrial control, the ATSAM4LS4BA-MU provides the deterministic 32-bit control processing and industrial temperature grading that factory environments demand, per the Mouser listing (QFN, GREEN, IND TEMP). The 48 MHz Cortex-M4 executes PID loops, Modbus or CAN-style protocol handling, and safety polling routines with ample headroom, while 256 KB flash holds application code plus field-updatable firmware. The 64-QFN package with exposed pad conducts heat into the PCB, improving reliability in sealed enclosures with no forced airflow. Designers typically pair the MCU with isolated RS-485 or CAN transceivers and industrial-grade power supervision. The industrial temperature grade and GREEN/RoHS compliance simplify deployment across global equipment platforms and long-lifetime industrial products.
Recommended
Smart Metering
Smart metering demands accurate measurement DSP plus multi-decade battery life, and the ATSAM4LS4BA-MU addresses both: the Cortex-M4's single-cycle MAC accelerates RMS computation, FFT leakage analysis, and tamper-detection algorithms, while SAM4L low-power modes trim the average budget in battery-backed meters. The 256 KB flash stores multi-tariff firmware, calibration tables, and communication stacks (e.g., DLMS/COSEM class protocols), and the 32 KB SRAM holds interval-load profiles. The 64-QFN (9x9 mm) footprint fits dense meter PCBs alongside the metrology front end. Industrial temperature grading covers outdoor meter cabinets, and GREEN RoHS compliance meets utility procurement standards across regions, making the part a strong controller choice for electricity, gas, and water meter platforms.
Recommended
Human Interface and Touch Control Panels
The ATSAM4LS4BA-MU serves capacitive-touch control panels and appliance HMIs, where the 48 MHz Cortex-M4 runs touch-scanning and decoding libraries with low jitter while the MCU's sleep modes keep panel standby power within regulatory limits. The 256 KB flash supports touch tuning data, animation assets for small TFT or segment displays, and field-upgradeable firmware; the 32 KB SRAM buffers display frames and touch event queues. The 64-QFN (9x9 mm) no-lead package provides enough GPIO multiplexing for a segmented touch grid plus backlight and buzzer control. Industrial temperature rating permits appliance installations near heat sources, and RoHS/GREEN compliance aligns with consumer appliance environmental requirements in global markets.
Recommended
Medical and Portable Diagnostic Devices
Portable medical devices benefit from the ATSAM4LS4BA-MU's combination of DSP-class signal processing and low standby power. The Cortex-M4 MAC/SIMD instructions handle baseline wander removal, QRS-style peak detection, and oversampling decimation on physiological signals, while sleep modes extend battery runtime between charges in wearable monitors. The 256 KB flash stores calibration, patient-data buffers, and BLE-style communication firmware, and the 32 KB SRAM supports logging sessions between uploads. The 3.3 V, 64-QFN (9x9 mm) package enables compact, low-profile enclosures appropriate for handheld diagnostic instruments. Engineers must verify the exact leakage and sleep currents from the official datasheet when documenting device battery-life claims for regulatory submissions.
Recommended
Consumer Appliances and White Goods
In white goods and consumer appliances, the ATSAM4LS4BA-MU consolidates motor-assist control, user-interface scanning, and communication in one 32-bit device. The 48 MHz Cortex-M4 runs compressor/fan control loops with the DSP extensions, while remaining flash margin (256 KB total) covers field firmware updates distributed over appliance service links. Low-power modes support always-on clock and standby features mandated by energy regulations. The GREEN, RoHS-compliant 64-QFN (9x9 mm) package meets the environmental requirements of global appliance manufacturers, and the industrial temperature grade tolerates enclosed, poorly ventilated electronics compartments. Board designers commonly pair it with isolated AC-mains sensing and relay or TRIAC drive stages under MCU GPIO control.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM4LS4BA-MU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM4LS4AA-MU | ATSAM4LS2BA-MUR | ATSAM4LS8BA-MUR | ATSAM4LC4BA-MU |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| Core | ARM Cortex-M4, 32-bit | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 |
| Max Clock Speed | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash Memory | 256 KB | 256 KB | 128 KB | 512 KB | 256 KB |
| Temperature Grade | Industrial | Industrial | Industrial | Industrial | Industrial |
Key Differentiators
- Balanced memory configuration (vs ATSAM4LS2BA-MUR)
- Cost-optimized for 256 KB designs (vs ATSAM4LS8BA-MUR)
- Production-qualified silicon (vs ATSAM4LS4BA-MU-ES)
Design Notes
The ATSAM4LS4BA-MU is a 3.3 V-class device. Provide separate clean supply domains for the core/IO rails per the SAM4L datasheet power architecture, and decouple each VDD/VDDIO pair with 100 nF ceramics placed within 2 mm of the pins, plus a bulk 4.7-10 uF capacitor near the package. If USB or radio peripherals are used, isolate noisy load transients with a ferrite bead on the analog/PLL supply pin. Verify exact rail names and allowable ranges in the official datasheet power-supply chapter before finalizing the schematic.
The 64-QFN (9x9 mm) no-lead package requires a well-defined exposed-pad footprint for both electrical return and thermal relief. Follow Microchip/Atmel QFN land-pattern guidelines: an exposed-pad via array (typically 4-9 thermal vias on a 1.0-1.2 mm pitch) stitching to a ground plane improves heat spreading and reduces ground bounce. Use solder paste divided into multiple small apertures on the exposed pad to avoid voids and device float during reflow, and inspect with X-ray for volume production.
When migrating within the SAM4L family (e.g., from ATSAM4LS2BA to ATSAM4LS4BA), flash and SRAM boundaries change - validate linker scripts and flash wait-state settings against the 48 MHz clock before porting. Also confirm debugger compatibility: engineering-sample parts such as ATSAM4LS4BA-MU-ES may require newer toolchain device packs and may not be qualified for production shipments. Always lock unused GPIO as outputs-low or inputs with pull defined at boot to avoid floating-pin leakage in battery designs.
Compliance Information
Mouser listing identifies the part as QFN, GREEN, IND TEMP, MRL A - GREEN indicates RoSS/RoHS-classified lead-free, halogen-free packaging. REACH and conflict-minerals status not stated in provided data.
