ATSAM4LS4BA-AUR - 32-bit ARM Cortex-M4 48MHz MCU 256KB | Microchip
MPN: ATSAM4LS4BA-AUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.12 | $5.12 |
| 10 | $4.61 | $46.10 |
| 100 | $4.18 | $418.00 |
| 500 | $3.79 | $1,895.00 |
| 1,000 | $3.42 | $3,420.00 |
ATSAM4LS4BA-AUR Overview
A microcontroller (MCU) is a complete computing system integrated onto a single chip, combining a processor core, program memory, data memory, and a rich set of peripherals. The ARM Cortex-M4 at the heart of the SAM4L family sits near the top of the embedded processor hierarchy, which runs from simple 8-bit cores through Cortex-M0/M0+ up to the DSP-capable Cortex-M4, making the SAM4L suitable for mid-to-high-performance embedded control, sensing, and connectivity tasks.
Key features of the ATSAM4LS4BA-AUR include the Cortex-M4 RISC processor running at 48 MHz with single-cycle DSP instructions and a hardware FPU, 256KB of flash for code storage, operation from 1.8V or 3.3V supplies, and an industrial temperature grade of -40C to +85C. The device also integrates a hardware cryptographic engine, as noted on distributor listings (TQFP, Green, IND TEMP, CRYPTO, MRL A), which accelerates AES and other security primitives for secure IoT and connected products.
Architecturally, the SAM4L series is optimized for ultra-low-power applications: it uses a low-leakage process and multiple power modes, including sleep, wait, and backup modes, allowing battery-powered designs to spend most of their life in standby while retaining fast wake-up to active execution. The Cortex-M4 core delivers approximately 1.25 DMIPS/MHz, so the 48 MHz clock yields roughly 60 DMIPS, sufficient for sensor fusion, digital filtering, and lightweight protocol stacks.
Typical applications include battery-powered industrial sensors, building automation nodes, consumer appliances, portable medical accessories, and secure connected devices where the cryptographic engine and low-power modes directly extend product battery life.
For design, budget flash usage carefully: 256KB is generous for control code but tight for large BLE or TLS stacks, in which case a higher-memory SAM4L variant in the same package should be considered. Follow Microchip layout guidance for decoupling and VDDIO domain separation to maximize noise immunity.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet, providing a single self-contained reference for selection engineers.
Drop-in alternatives for ATSAM4LS4BA-AUR — 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-AUR (same form factor and footprint) — differing in Package, Operating Temperature, Number of Pins, Packaging.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAM4LC4BA-AUR
✅ Drop-In✓ In Stock
$3.25 / Unit
View Datasheet →ATSAM4LS4CA-AUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.85 / Unit
View Datasheet →ATSAM4LC4CA-AUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.71 / Unit
View Datasheet →ATSAM4LS2BA-AUR
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATSAM4LC2BA-AUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.35 / Unit
View Datasheet →ATSAM4LS4BA-AUR Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M4 |
| Core Size | 32-Bit |
| Maximum Clock Frequency | 48 MHz |
| Flash Memory Size | 256KB (256K x 8) |
| Supply Voltage | 1.8V / 3.3V |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 64-TQFP (10x10 mm) |
| Pin Count | 64 |
| Mounting Type | Surface Mount |
| Termination Form | Gull Wing |
| Package Shape | Square (TFQFP) |
| Hardware Crypto Engine | Yes |
| Packaging | Tape & Reel (T/R) |
| RoHS / Green Status | Green, RoHS Compliant |
| Series | SAM4L |
ATSAM4LS4BA-AUR square (tfqfp) Pin Configuration Guide
Pin configuration for ATSAM4LS4BA-AUR (square (tfqfp) 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-AUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAM4LS4BA-AUR is suitable for 6 applications: Battery-Powered Industrial Sensor Nodes, Secure IoT End Devices, Building Automation and HVAC Control, Portable Medical and Health Accessories, Consumer Appliance Control Boards, Handheld Test and Measurement Instruments.
Battery-Powered Industrial Sensor Nodes
The ATSAM4LS4BA-AUR fits industrial sensor nodes because the SAM4L family pairs a 48 MHz Cortex-M4 core with ultra-low-power sleep, wait, and backup modes that minimize average current draw in duty-cycled sampling applications. The DSP instructions accelerate filtering of ADC data from pressure, temperature, or vibration sensors, while the integrated cryptographic engine secures data upload. In a typical node the MCU sleeps between measurement intervals, waking on RTC or external interrupts; unlike 8-bit MCUs it performs local signal processing without offloading, reducing radio airtime and extending battery life in -40C to +85C field environments.
Recommended
Secure IoT End Devices
The ATSAM4LS4BA-AUR suits secure IoT endpoints because it integrates a hardware cryptographic engine, noted in the Mouser listing (TQFP, Green, IND TEMP, CRYPTO), which accelerates AES operations for TLS handshake and encrypted telemetry without heavy software latency. The 256KB flash accommodates a lightweight TLS stack plus application code, and the 48 MHz Cortex-M4 provides the throughput for elliptic-curve session setup. Placed as the main controller driving a wireless module over UART/SPI, the MCU can gate module power in backup mode; the trade-off is that very large full TLS stacks may need the higher-memory SAM4L variants.
Recommended
Building Automation and HVAC Control
The ATSAM4LS4BA-AUR is a strong fit for building automation controllers and HVAC zone controls. The industrial -40C to +85C rating tolerates rooftop and mechanical-room temperatures, the 1.8V/3.3V supply range simplifies integration with 3.3V sensor rails, and the 64-pin TQFP provides enough GPIO for relays, triacs, and multiple sensor buses (I2C, UART, SPI). The Cortex-M4 core at 48 MHz runs PID loops for damper and valve control with headroom for communication protocol handling. Typical designs sleep between 100 ms control ticks, and the SAM4L low-power modes keep standby current low enough for thermostats powered from a single phase-neutral energy source.
Recommended
Portable Medical and Health Accessories
For portable medical accessories such as glucose meters, pulse oximeters, and digital thermometers, the ATSAM4LS4BA-AUR combines fast wake-up with low standby power, keeping batteries small and product enclosures compact. The Cortex-M4 DSP capability enables on-device signal conditioning of analog front-end data, and the hardware crypto engine supports HIPAA-oriented data protection for Bluetooth-tethered uploads. The 256KB flash stores calibration tables and UI code with margin. Designs typically run the MCU from an LDO at 3.3V and exploit backup mode between patient measurements; industrial temperature grading also simplifies shipping and storage qualification across global climates.
Recommended
Consumer Appliance Control Boards
The ATSAM4LS4BA-AUR serves appliance control boards for coffee machines, air purifiers, and smart kitchen devices where a capacitive-touch UI, motor control, and connectivity coexist. The 48 MHz Cortex-M4 runs the control loop and UI simultaneously, 256KB flash holds touch-tuning and OTA-bootloader code, and the 64-pin TQFP exposes enough I/O for keypads, LED segments, and sensor inputs. The green, RoHS-compliant package meets consumer environmental requirements, and tape-and-reel packaging suits high-volume SMT lines. Compared with 8-bit MCUs, the single-chip integration reduces BOM count and firmware complexity in touch-plus-control designs.
Recommended
Handheld Test and Measurement Instruments
In handheld meters and portable test instruments, the ATSAM4LS4BA-AUR provides the compute for DSP-based measurement algorithms (RMS computation, FFT windowing) at 48 MHz while staying within battery budgets through aggressive use of sleep modes. The 1.8V to 3.3V operating range allows direct regulation from a single-cell lithium source, the industrial temperature range survives workshop and field conditions, and 256KB flash retains firmware, calibration constants, and logged-data buffers. The hardware crypto engine can sign measurement logs for compliance reporting. SWD debugging via Atmel-ICE class tools supports field firmware updates through a custom bootloader.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM4LS4BA-AUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM4LC4BA-AUR | ATSAM4LS4CA-AUR | ATSAM4LS2BA-AUR | ATSAM4LC2BA-AUR |
|---|---|---|---|---|---|
| Package | 64-TQFP (10x10) | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M4, 32-bit | ARM Cortex-M4, 32-bit | ARM Cortex-M4, 32-bit | ARM Cortex-M4, 32-bit | ARM Cortex-M4, 32-bit |
| Max Clock Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash Memory | 256KB | 256KB | 256KB | 128KB (-50%) | 128KB (-50%) |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | Extended CA grade | -40C to +85C | -40C to +85C |
| Peripheral Set | Full LS series peripheral integration | Reduced (LC series) | Full LS series | Full LS series, fewer memory-dependent blocks | Reduced (LC series) |
| Packaging | Tape & Reel (AUR) | Tape & Reel | Tape & Reel | Tape & Reel | Tape & Reel |
Key Differentiators
- Full LS-series peripheral integration with hardware crypto (vs ATSAM4LC4BA-AUR)
- 2x the flash of value-tier variants (vs ATSAM4LS2BA-AUR)
- Cost-effective industrial grade (vs ATSAM4LS4CA-AUR)
- Cortex-M4 with DSP instructions vs Cortex-M0+ competitors (vs MKL16Z256VLH4)
Design Notes
The SAM4L operates from 1.8V or 3.3V rails; use a clean 3.3V LDO or buck output with at least 100 nF of ceramic decoupling per VDD/VDDIO pin pair plus a 4.7 uF to 10 uF bulk capacitor near the package. Separate VDDIO domains per datasheet guidance so switching peripherals (USART, SPI) do not couple noise into the analog supply. If targeting battery operation, measure actual sleep-mode current with your firmware configuration, because peripheral clock gating choices dominate standby consumption.
For the 64-TQFP (10x10 mm) land pattern, follow the IPC-recommended TQFP-64 footprint in the Microchip packaging datasheet and keep the SWD (SWCLK/SWDIO) traces short and routed away from noisy switching nets for reliable programming and debug. Place a 100 nF capacitor within 2 mm of each supply pin. If using the 32.768 kHz crystal for the RTC/backup domain, keep it adjacent to the IC with a guard ground ring to preserve low-power timing accuracy.
Verify flash budget before committing to this 256KB part: TLS/BLE stacks plus an OTA bootloader can exceed 256KB, in which case migrate to a higher-memory SAM4L variant before layout freeze - same-package memory variants keep the PCB unchanged. Also confirm peripheral availability when substituting LC variants for LS parts, since the LC series trims peripheral blocks despite being pin-compatible. Finally, do not assume datasheet sleep currents apply without your exact clock and regulator configuration.
Compliance Information
Mouser lists this part as 'TQFP, Green, IND TEMP, CRYPTO, MRL A' - Green denotes Microchip green (RoHS, halogen-free) packaging. REACH and conflict minerals declarations should be confirmed via Microchip compliance documentation.
