ATSAM4LC8BA-UUR - 48MHz Cortex-M4 512KB WLCSP-64 | Microchip
MPN: ATSAM4LC8BA-UUR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.2 | $6.20 |
| 10 | $5.6 | $56.00 |
| 100 | $4.95 | $495.00 |
| 500 | $4.45 | $2,225.00 |
| 1,000 | $3.95 | $3,950.00 |
ATSAM4LC8BA-UUR Overview
A microcontroller (MCU) is a single-chip computer that integrates a processor core, memory, and peripherals, forming the lowest level of the embedded system hierarchy: MCU -> embedded processor -> ARM Cortex-M family -> ARM architecture. The SAM4L family belongs to Microchip's (formerly Atmel) 32-bit ARM-based flash MCU portfolio, positioned for ultra-low-power applications.
Key features include the lowest active-mode current in its class at 90uA/MHz, deep-sleep current of 1.5uA, and the shortest wake-up time among Cortex-M4-based devices at down to 1.5us. The integrated AES cryptographic engine supports secure data handling, and the chip provides 10-bit and 12-bit ADC options with up to 43 GPIO pins.
Architecturally, the Cortex-M4 core includes DSP instructions and optional FPU capability, while the SAM4L peripheral set integrates flexible serial communication controllers, timer/counter units, and the PICOPower technology that enables aggressive power-domain gating. This lets designers switch off unused peripherals and RAM blocks, achieving near-zero standby consumption without losing fast wake-up responsiveness.
Typical applications include battery-powered portable instrumentation, IoT sensor nodes, wearable and medical monitoring devices, and energy-harvesting systems where the ultra-low active current and fast wake-up directly extend battery life.
A key design consideration is the WLCSP ball-grid footprint: fan-out routing under a 0.5mm-pitch ball array requires microvia PCB technology, so verify fabrication capability before committing the land pattern.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATSAM4LC8BA-UUR 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 ATSAM4LC8BA-UUR (same form factor and footprint) β differing in Core Processor, Flash Memory, Package, Packaging, Series.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATSAM4LC4BA-UUR
β Drop-Inπ Reference alternative (not in catalog)
ATSAM4LC8CA-UUR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATSAM4LC4CA-UUR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATSAM4LC8BA-AUR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATSAM4LC8AA-UUR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATSAM4LC8BA-UUR Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M4 |
| Core Size | 32-bit |
| Maximum Clock Frequency | 48 MHz |
| Flash Memory | 512 KB |
| Supply Voltage Range | 1.68 V to 3.6 V |
| Active Mode Current | 90 uA/MHz |
| Sleep Mode Current | 1.5 uA |
| Wake-up Time | 1.5 us (minimum) |
| ADC Resolution | 10-bit, 12-bit |
| Number of GPIOs | 43 |
| Package | 64-ball WLCSP (5.27 x 5.19 mm) |
| Mounting Type | Surface Mount |
| Cryptography | AES hardware acceleration |
| Temperature Range | Industrial (-40C to +85C) |
| Packaging | Tape & Reel (T&R) |
| RoHS Status | Compliant |
| Series | SAM4L (ATSAM4LC8B) |
ATSAM4LC8BA-UUR 64-ball wlcsp (5.27 x 5.19 mm) Pin Configuration Guide
Pin configuration for ATSAM4LC8BA-UUR (64-ball wlcsp (5.27 x 5.19 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 ATSAM4LC8BA-UUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAM4LC8BA-UUR is suitable for 6 applications: Battery-Powered Portable Instruments, IoT Sensor Nodes, Wearable and Health Monitoring Devices, Energy-Harvesting Systems, Industrial Remote Monitoring, Secure Embedded Access Control.
Battery-Powered Portable Instruments
The ATSAM4LC8BA-UUR's 90uA/MHz active current and 1.5uA sleep current directly translate into extended battery runtime for handheld meters, data loggers, and portable test equipment. A typical design sleeps between measurement events and wakes in 1.5us via RTC or external interrupt, so the CPU is active only milliseconds per minute, pushing average current into the microamp range. The 512KB flash accommodates logging firmware, calibration tables, and USB or BLE-style communication stacks without external memory. Its 1.68V to 3.6V supply range allows direct operation from a lithium coin cell through a simple regulator across the full discharge curve.
Recommended
IoT Sensor Nodes
Wireless sensor nodes benefit from the SAM4L's aggressive power-domain gating: unused peripherals and RAM blocks can be switched off while the device waits in 1.5uA sleep, then wakes in 1.5us to burst-process sensor data at 48MHz. The hardware AES engine encrypts telemetry payloads with minimal CPU cost, supporting secure over-the-network operation. The 12-bit ADC digitizes analog sensors directly, and up to 43 GPIOs interface multiple sensor buses on one chip. The compact 5.27 x 5.19 mm WLCSP footprint fits coin-cell-sized node PCBs, while the industrial temperature rating covers uncontrolled outdoor enclosures.
Recommended
Wearable and Health Monitoring Devices
Wearable medical and fitness products demand both miniaturization and long battery life, and the ATSAM4LC8BA-UUR addresses both. Its 64-ball WLCSP at 5.27 x 5.19 mm is among the smallest footprints available for a 512KB Cortex-M4, enabling placement inside watch straps and patch-style monitors. The 12-bit ADC samples biopotential and bioimpedance front-ends, while 90uA/MHz active current keeps continuous signal-processing duty cycles affordable on small lithium-polymer cells. The 1.5us wake-up supports event-driven sampling of heart-rate or motion data without holding the core active, and hardware AES protects patient data in transit.
Recommended
Energy-Harvesting Systems
Photovoltaic, thermoelectric, and RF energy-harvesting supplies deliver only tens to hundreds of microamps average, making the SAM4L's power profile essential. The device can start and operate from a reservoir capacitor charged by the harvester, executing short compute bursts at 90uA/MHz and returning to 1.5uA sleep so the stored charge is not drained between events. The 1.68V low-end supply operation works directly with cold-start harvester PMICs, and the 1.5us wake-up means the MCU spends nearly all time asleep even with high event rates. The industrial temperature grade tolerates the outdoor thermal environments typical of harvester installations.
Recommended
Industrial Remote Monitoring
Factory and infrastructure monitoring endpoints require industrial temperature compliance, robust ADC inputs, and intermittent but secure connectivity, all matched by the ATSAM4LC8BA-UUR. Rated for industrial temperature ranges, it survives unconditioned panels and outdoor cabinets. Its 10-bit and 12-bit ADCs digitize 4-20mA-derived and vibration sensor signals, while the 512KB flash stores protocol stacks, local buffering, and firmware-update images. Sleep-mode consumption of 1.5uA suits battery-backed nodes that must continue logging through power outages, and the AES engine secures telemetry toward SCADA or cloud endpoints. The WLCSP package suits dense multi-channel sensor boards.
Recommended
Secure Embedded Access Control
Access-control readers, smart locks, and secure tokens benefit from the SAM4L's combination of hardware AES, 512KB flash for credential databases, and low standby power on battery or backup supply. The cryptographic engine handles challenge-response authentication with the host controller without exposing keys to software-timed attacks, and the 1.5uA sleep current suits always-on readers that idle most of the day. Wake-up in 1.5us from a capacitive-touch or RF-detector interrupt gives instant response when a credential is presented. The compact WLCSP-64 footprint integrates the reader logic into slim door hardware.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM4LC8BA-UUR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM4LC4BA-UUR | ATSAM4LC8CA-UUR | ATSAM4LC4CA-UUR | ATSAM4LC8BA-AUR |
|---|---|---|---|---|---|
| Package | 64-ball WLCSP (5.27 x 5.19 mm) | 64-ball WLCSP - same | 64-ball WLCSP - same | 64-ball WLCSP - same | 64-ball WLCSP - same |
| Brand | Microchip Technology | 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 | 512 KB | 256 KB | 512 KB | 256 KB | 512 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 |
| Active Mode Current | 90 uA/MHz | 90 uA/MHz | 90 uA/MHz | 90 uA/MHz | 90 uA/MHz |
| Temperature Grade | Industrial (-40C to +85C) | Industrial | Extended | Extended | Automotive/Extended |
| Hardware Crypto (AES) | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Double the flash at identical footprint (vs ATSAM4LC4BA-UUR)
- Extended temperature option on the same die (vs ATSAM4LC8CA-UUR)
- Hardware AES cryptography (vs ATSAM4LC4BA-UUR)
Design Notes
The 64-ball WLCSP (5.27 x 5.19 mm) uses a dense ball array that typically requires 0.4-0.5mm pitch routing. Plan for microvia (HDI) PCB fabrication: laser-drilled vias, Via-in-pad with fill, and at least 4 layers to fan out the 43 GPIOs plus power balls. Verify your fabricator's minimum trace/space (typically 75um/75um for WLCSP work) before locking the land pattern, and follow the Microchip SAM4L datasheet land-pattern dimensions for stencil aperture design.
To actually achieve the advertised 1.5uA sleep current, every unused peripheral clock must be gated and unused GPIOs should be configured as inputs with pull-ups or grounded outputs per the SAM4L power-management guidelines in the datasheet. Floating inputs cause shoot-through current in input buffers that can raise sleep consumption by tens of microamps. Use the SAM4L's PICOPower sleepwalk feature so peripherals can operate while the CPU core is powered down.
WLCSP packages are mechanically fragile: board flex during connector insertion or enclosure assembly can crack ball solder joints. Add underfill if the product will see flexure or thermal cycling, and specify the board finish (ENIG recommended) to keep coplanarity across the ball array. Also note that rework of a WLCSP device is effectively impractical - validate the assembly profile carefully to avoid scrapping complete boards.
Compliance Information
RoHS compliance confirmed via JLCPCB listing (marked ROHS) and Mouser listing (MRL A, Tape & Reel). REACH, halogen-free, and conflict-minerals declarations not found in source data - request Microchip compliance certificate for full documentation.
