ATSAM4LS4BA-MUR - 48MHz Cortex-M4 256KB MCU | Microchip
MPN: ATSAM4LS4BA-MUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.92 | $5.92 |
| 10 | $5.45 | $54.50 |
| 100 | $4.98 | $498.00 |
| 500 | $4.6 | $2,300.00 |
| 1,000 | $4.25 | $4,250.00 |
ATSAM4LS4BA-MUR Overview
A 32-bit microcontroller (MCU) is an integrated circuit that combines a processor core, memory, and peripherals on a single chip, sitting within the broader hierarchy of embedded processors: microcontroller -> ARM Cortex-M core family -> system-on-chip for embedded control. The SAM4L family is Atmel (now Microchip) Flash MCUs based on the high-performance ARM Cortex-M4 RISC processor, which includes a hardware floating-point unit and DSP instructions.
Key features include the 48 MHz Cortex-M4 core with FPU, 256 KB Flash and 32 KB SRAM, and low-power operation suited to battery-powered designs. The industrial temperature grade and Tape & Reel (T/R) packaging support automated high-volume assembly.
The SAM4L architecture integrates a multi-layer bus matrix, flexible peripheral event system, and power-management controller with multiple sleep modes, allowing peripherals to operate while the CPU sleeps to minimize energy per task in low-power applications.
Typical applications include battery-powered portable instruments, industrial sensing and control nodes, and consumer devices requiring a balance of processing performance (hardware floating point at 48 MHz) and low standby power.
Design consideration: operate the device within the 1.68V to 3.6V supply window (nominal 3.3V) and confirm GPIO assignments against the manufacturer datasheet before layout, as QFN packages with exposed pads require careful thermal and ground pad soldering.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATSAM4LS4BA-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 ATSAM4LS4BA-MUR (same form factor and footprint) — differing in Package, Flash Memory Size, RoHS Status, Supply Voltage, Packaging.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAM4LS4BA-AUR
✅ Drop-In✓ In Stock
$3.42 / Unit
View Datasheet →ATSAM4LS4BA-MU
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →ATSAM4LC4BA-MUR
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATSAM4LS4CA-MUR
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATSAM4LS2BA-MUR
✅ Drop-In✓ In Stock
$5.4 / Unit
View Datasheet →ATSAM4LC8BA-UUR
✅ Drop-In✓ In Stock
$3.95 / Unit
View Datasheet →ATSAM4LS4BA-MUR Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M4 |
| Core Size | 32-Bit |
| Maximum Clock Frequency | 48 MHz |
| Flash Memory Size | 256 KB (256K x 8) |
| RAM Size | 32K x 8 |
| Supply Voltage Range | 1.68 V to 3.6 V |
| Nominal Supply Voltage | 3.3 V |
| Series | SAM4L |
| Package | 64-QFN (9x9 mm) with Exposed Pad |
| Number of Terminals | 64 |
| Mounting Type | Surface Mount |
| Temperature Grade | Industrial |
| Packaging | Tape & Reel (T/R) |
| Product Status | Active |
| Program Memory Type | FLASH |
ATSAM4LS4BA-MUR 64-qfn (9x9 mm) with exposed pad Pin Configuration Guide
Pin configuration for ATSAM4LS4BA-MUR (64-qfn (9x9 mm) with 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 ATSAM4LS4BA-MUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAM4LS4BA-MUR is suitable for 6 applications: Battery-Powered Portable Instruments, Industrial Sensing and Control Nodes, Metering and Instrumentation Front Ends, Consumer Embedded Devices, IoT Sensor Nodes and Gateways, Motor Control and Actuation.
Battery-Powered Portable Instruments
The ATSAM4LS4BA-MUR fits portable instruments because its SAM4L platform is Microchip's power-optimized Cortex-M4 line: it combines a 48 MHz peak clock for fast burst computation with multiple low-power sleep modes governed by an integrated power management controller. The 1.68V to 3.6V supply range allows direct operation from a single lithium cell via a simple LDO, and the hardware FPU accelerates sensor math (filtering, calibration, linearization) that would otherwise dominate the energy budget in software emulation. In a typical design the MCU sleeps between samples, waking on RTC or peripheral events, so average current is dominated by sleep-mode figures documented in the manufacturer datasheet rather than the active 48 MHz specification.
Recommended
Industrial Sensing and Control Nodes
For industrial sensing nodes, the ATSAM4LS4BA-MUR provides the industrial temperature grade demanded by factory-floor environments, plus the processing headroom (Cortex-M4 with DSP instructions at 48 MHz) to run PID loops, FFT-based vibration analysis, or protocol stacks locally. The 256 KB Flash accommodates field-updatable firmware with dual-image bootloaders, while 32 KB SRAM buffers sensor data and communication frames. Its 64-QFN (9x9 mm) footprint keeps the node compact, and the exposed-pad package provides solid ground reference for analog front ends. Designers should verify the exact industrial temperature range in the SAM4L datasheet and provide proper decoupling on the 3.3V rail for EMC robustness in electrically noisy environments.
Recommended
Metering and Instrumentation Front Ends
The ATSAM4LC4BA-MUR sibling with its LCD controller is often chosen for meters, but the ATSAM4LS4BA-MUR itself suits battery metering products that use external displays or segment drivers, thanks to its low sleep current and long-battery-life sleep modes. The 32-bit Cortex-M4 core performs energy computation (RMS, power factor, harmonic analysis using DSP instructions) at 48 MHz, while 256 KB Flash holds tariff tables and communication stacks. The 1.68V to 3.6V rail tolerance supports directly regulated meter supplies. Use the peripheral event system to route ADC results to memory without CPU intervention, minimizing wake time and maximizing battery life in always-on metering products.
Recommended
Consumer Embedded Devices
In consumer products such as remote controls, small appliances, fitness accessories, and toys, the ATSAM4LS4BA-MUR offers a strong performance-per-dollar point: 48 MHz Cortex-M4 with hardware FPU, 256 KB Flash for feature-rich firmware, and a compact 9x9 mm QFN for space-limited industrial design. Tape & Reel packaging supports high-volume SMT assembly, and the GREEN industrial part status aligns with consumer environmental requirements. The 32 KB SRAM comfortably hosts BLE or sub-GHz radio stacks running on companion modules. Engineers should budget GPIO count from the datasheet pin-multiplexing tables early, since QFN pin assignments are fixed and multiplexer configuration constrains peripheral placement during PCB layout.
Recommended
IoT Sensor Nodes and Gateways
IoT nodes benefit from the ATSAM4LS4BA-MUR's balance of DSP-capable 32-bit processing and low standby power: edge filtering and anomaly detection run locally on the Cortex-M4 FPU at 48 MHz, while the multi-sleep-mode power controller keeps average draw low between radio transmissions. The SAM4L peripheral event system and DMA reduce CPU wake-ups, directly cutting energy per sensor transaction. With 256 KB Flash there is room for OTA-update bootloaders plus application and crypto code, and 32 KB SRAM buffers mesh-networking stacks. Pair with a certified radio module over UART/SPI and power the MCU rail from a high-efficiency buck converter sized for the 3.6V maximum input.
Recommended
Motor Control and Actuation
The ATSAM4LS4BA-MUR suits small motor control tasks where the Cortex-M4's DSP instructions and hardware FPU execute field-oriented control or complementary PWM algorithms at 48 MHz. The SAM4L peripheral set includes PWM-capable timers and the event system allows fast fault reaction paths independent of CPU latency. The industrial temperature grade and QFN exposed-pad package provide the thermal and environmental robustness needed near actuators. Because this memory point focuses on the LS power-optimized subset, designers of higher-channel-count motor drives should verify PWM channel availability in the datasheet; for BLDC fans, pumps, and latches within modest power levels, this MCU provides deterministic control with low standby consumption.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM4LS4BA-MUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM4LS4BA-AUR | ATSAM4LC4BA-MUR | ATSAM4LS2BA-MUR | ATSAM4LC8BA-UUR |
|---|---|---|---|---|---|
| Package | 64-QFN (9x9) EP | 64-QFN (9x9) EP - same | 64-QFN (9x9) EP - same | 64-QFN (9x9) EP - same | verify package code U against datasheet |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Max Clock | 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 | 256 KB | 256 KB | 256 KB | 128 KB (-50%) | 512 KB (+100%) |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 64 KB |
| Supply Voltage | 1.68 V to 3.6 V | 1.68 V to 3.6 V | 1.68 V to 3.6 V | 1.68 V to 3.6 V | 1.68 V to 3.6 V |
| LCD Controller | No | No | Yes (segment LCD) | No | Yes (segment LCD) |
Key Differentiators
- Full 256 KB Flash at this price point (vs ATSAM4LS2BA-MUR)
- Power-optimized LS subset (vs ATSAM4LC4BA-MUR)
- Hardware FPU and DSP instructions at 48 MHz (vs Cortex-M0+/M3 class MCUs at similar price)
Design Notes
Design the supply rail so worst-case excursions (regulator tolerance plus ripple and load transients) remain inside the 1.68V to 3.6V operating window of the ATSAM4LS4BA-MUR, with 3.3V nominal. Place a 10 uF bulk capacitor plus 0.1 uF ceramic decoupling at each supply pin group of the 64-QFN, as close to the pins as possible. If the design runs from a battery through an LDO, choose a regulator with quiescent current well below the MCU sleep current so the regulator does not dominate the standby budget; check the SAM4L datasheet sleep-mode current figures for your selected mode.
The 64-QFN (9x9 mm) exposed-pad package requires the center pad to be soldered to a grounded PCB land pattern with an array of thermal vias. Follow the land-pattern dimensions in the Microchip package drawing; undersized or un-soldered center pads are the leading cause of QFN field failures and poor ground integrity. Use non-solder-mask-defined (NSMD) pads for the 64 perimeter pins and print the stencil with approximately 50-70% coverage on the center pad aperture to avoid voiding and pad floating during reflow.
SAM4L GPIOs are multiplexed: each physical pin maps to multiple peripheral functions through the Peripheral Multiplexer, so a pin chosen for one function in schematic capture may conflict with another peripheral later. Before routing, build a pin-assignment table directly from the SAM4L datasheet alternate-function tables and reserve SWD (SWCLK/SWDIO) pins for programming and debugging. Also enable the hardware FPU in startup code; floating-point code compiled for software fallback will run but with large cycle-count penalties at 48 MHz.
Compliance Information
Distributor listings describe the part as GREEN (halogen-free), consistent with Microchip standard MCU processing. Formal RoHS/REACH/lead-free declarations should be confirmed from the official Microchip Material Declaration Data Sheet for this exact ordering code.
