ATSAM4S8BB-UUR - 120MHz Cortex-M4 MCU, 512KB Flash | Microchip
MPN: ATSAM4S8BB-UUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.85 | $4.85 |
| 10 | $4.36 | $43.60 |
| 100 | $3.85 | $385.00 |
| 500 | $3.42 | $1,710.00 |
| 1,000 | $3.05 | $3,050.00 |
ATSAM4S8BB-UUR Overview
A Cortex-M4 microcontroller is a 32-bit RISC processor core designed by ARM Holdings, featuring a single-precision floating-point unit (FPU), a Memory Protection Unit (MPU), and a comprehensive interrupt controller (NVIC). The Cortex-M4 sits within a broader taxonomy: ARM Cortex-M -> 32-bit MCU -> embedded microcontroller -> integrated circuit. The SAM4S family specifically targets consumer, industrial control, and PC peripheral applications where deterministic real-time response, integrated connectivity, and code density are essential.
Key features of the ATSAM4S8BB-UUR include a 1.62 V to 3.6 V supply range, full-speed USB 2.0 Device port with embedded transceiver, up to 16-channel 1 Msps ADC, multiple serial peripherals (USART, SPI, TWI), and a high-speed peripheral bus. The device integrates a flexible clocking system with an internal 8 MHz RC oscillator and PLL, and supports low-power sleep modes down to single-digit microampere current. The WLCSP-64 footprint (4.42 x 3.42 mm) makes it suitable for space-constrained designs such as wearables, IoT edge nodes, and portable instrumentation.
The SAM4S8 architecture implements the Cortex-M4 with Thumb-2 instruction set, optional DSP extensions, and a hardware FPU for floating-point math acceleration. Internal SRAM is organized as 128 KB on the system bus for code/data and an additional 16 KB for fast interrupt-driven tasks. Flash memory is dual-bank capable, enabling in-application programming (IAP) and live firmware updates without external bootloader support.
Typical applications include industrial sensor hubs, USB-connected PC peripherals, smart metering, fitness wearables, and motor control front-ends. The device is also a strong fit for HMI panels and battery-powered data loggers where the low-power sleep modes and integrated USB simplify BOM and PCB area.
When designing with this device, allocate the WLCSP's fine-pitch balls to a 4-layer PCB with microvia fan-out, since 0.4 mm ball pitch is below standard 6-mil via capability. Plan decoupling per the manufacturer's reference schematic, and reserve one full USB DP/DN pair with 90-ohm differential impedance for the integrated USB Device port.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing engineers a single reference for sourcing, comparison, and integration planning of the ATSAM4S8BB-UUR.
Drop-in alternatives for ATSAM4S8BB-UUR — 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 ATSAM4S8BB-UUR (same form factor and footprint) — differing in Package, Flash Memory, SRAM, RoHS Status, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAM4S8BA-MU
✅ Drop-In✓ In Stock
$5.79 / Unit
View Datasheet →ATSAM4S4CA-CU
✅ Drop-In✓ In Stock
$3.9 / Unit
View Datasheet →ATSAM4S4AB-AN
✅ Drop-In✓ In Stock
$3.55 / Unit
View Datasheet →ATSAM4S2BB-UUR
✅ Drop-In✓ In Stock
$2.38 / Unit
View Datasheet →ATSAM4S16BA-UUR
✅ Drop-In✓ In Stock
$5.6 / Unit
View Datasheet →ATSAM4S8BB-UUR Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M4 32-bit RISC |
| Maximum Clock Speed | 120 MHz |
| Flash Memory | 512 KB (512K x 8) |
| SRAM | 128 KB |
| Supply Voltage | 1.62 V to 3.6 V |
| Active Power Consumption | 200 uA/MHz (typical) |
| Package | 64-ball WLCSP, 4.42 x 3.42 mm |
| Mounting Type | Surface Mount (WLCSP) |
| Operating Temperature | -40C to +85C (Industrial) |
| USB Interface | USB 2.0 Full-Speed Device port with embedded transceiver |
| ADC | Up to 16-channel, 12-bit, 1 Msps |
| Communication Peripherals | USART, SPI, TWI (I2C) |
| FPU | Hardware single-precision Floating Point Unit |
| RoHS Status | Compliant |
| Lead-Free | Yes |
ATSAM4S8BB-UUR 64-ball wlcsp, 4.42 x 3.42 mm Pin Configuration Guide
Pin configuration for ATSAM4S8BB-UUR (64-ball wlcsp, 4.42 x 3.42 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 ATSAM4S8BB-UUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAM4S8BB-UUR is suitable for 6 applications: Industrial Sensor Hub, USB-Connected PC Peripheral, Wearable Fitness Tracker, Smart Meter Data Logger, Battery-Powered HMI Panel, Motor Control Front-End (BLDC FOC).
Industrial Sensor Hub
The ATSAM4S8BB-UUR fits industrial sensor hubs because of its 120 MHz Cortex-M4 core with hardware FPU for processing sensor fusion algorithms, and its 16-channel 12-bit ADC sampling at up to 1 Msps. The 128 KB SRAM accommodates multi-axis IMU buffers and Kalman filter state, while the 512 KB Flash stores firmware for Modbus, IO-Link, or proprietary protocols. The 1.62-3.6 V supply tolerates 24 V industrial rails when paired with a switching pre-regulator. Integrated USB enables field firmware upgrades via the same connector used for commissioning, reducing field service time.
Recommended
USB-Connected PC Peripheral
The integrated USB 2.0 Full-Speed Device port with on-chip transceiver eliminates the need for an external PHY, simplifying USB HID, CDC, or vendor-class peripherals. The 120 MHz Cortex-M4 handles HID reports, custom protocols, and LED/display updates with ample headroom. The 512 KB Flash accommodates USB stack plus application logic, and 128 KB SRAM supports double-buffered endpoint transfers at 12 Mbps. The 4.42 x 3.42 mm WLCSP footprint suits compact dongles and embedded modules that plug directly into a USB-C receptacle with appropriate routing.
Recommended
Wearable Fitness Tracker
Wearable designs benefit from the ATSAM4S8BB-UUR's WLCSP-64 (4.42 x 3.42 mm) footprint and 200 uA/MHz active current. At 48 MHz with all peripherals off in Sleep mode, the device draws single-digit microamps with RTC running, extending coin-cell runtime. The Cortex-M4 FPU accelerates step-counting and motion-classification DSP algorithms, while 128 KB SRAM buffers sensor windows. The USB port enables direct charging/firmware update without an external interface IC, and the -40 to +85 C operating range handles body-temperature extremes and outdoor use.
Recommended
Smart Meter Data Logger
Smart meters demand long retention and reliable RTC-backed time stamping. The ATSAM4S8BB-UUR's dual-bank 512 KB Flash supports wear-leveled event logging with in-application programming, while 128 KB SRAM buffers measurement frames between radio transmissions. The 12-bit ADC with 16 channels handles multi-phase current/voltage sensing, and the 1.62-3.6 V supply allows direct connection to a 3.6 V Li-SOCl2 backup cell. Industrial -40 to +85 C operation and low Sleep current extend battery life to 10+ years in remote metering deployments.
Recommended
Battery-Powered HMI Panel
Small HMI panels use the ATSAM4S8BB-UUR to drive TFT displays and read capacitive touch via SPI/I2C peripherals. The 120 MHz Cortex-M4 with FPU handles LVGL/EmWin graphics rendering, while the 512 KB Flash stores fonts and graphics assets. The integrated USB simplifies firmware updates from a host PC. The 64-ball WLCSP allows compact panel designs under 30 x 30 mm. Sleep modes drop consumption when the panel is idle, preserving battery life in portable test instruments or hand-held operator terminals.
Recommended
Motor Control Front-End (BLDC FOC)
Sensorless BLDC FOC requires fast ADC sampling and DSP throughput - both delivered by the ATSAM4S8BB-UUR's 120 MHz Cortex-M4 with single-cycle MAC and hardware FPU. The 1 Msps ADC synchronizes to PWM for current sensing, and 128 KB SRAM holds observer state vectors. The 512 KB Flash fits FOC libraries plus application code for pumps, fans, or e-bike controllers under 1 kW. The WLCSP-64 footprint suits integrated motor-driver modules where PCB area is constrained. Industrial temperature grade supports under-hood automotive and white-goods applications.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM4S8BB-UUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM4S8BA-MU | ATSAM4S4CA-CU | ATSAM4S2BB-UUR | ATSAM4S16BA-UUR |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | WLCSP-64 (4.42x3.42 mm) | LQFP-64 | LQFP-64 | WLCSP-64 | WLCSP-64 |
| Flash Memory | 512 KB | 512 KB | 256 KB | 128 KB | 1 MB |
| SRAM | 128 KB | 128 KB | 64 KB | 64 KB | 192 KB |
| Max Clock Speed | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz |
| Core | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 |
| USB Interface | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device |
| Supply Voltage | 1.62 V to 3.6 V | 1.62 V to 3.6 V | 1.62 V to 3.6 V | 1.62 V to 3.6 V | 1.62 V to 3.6 V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- WLCSP-64 smallest-in-class footprint with same SAM4S8 die (vs ATSAM4S8BA-MU (LQFP-64))
- 512 KB Flash doubled over lower-tier ATSAM4S2 (vs ATSAM4S2BB-UUR (128 KB Flash))
- 128 KB SRAM for large sensor buffers (vs ATSAM4S4CA-CU (64 KB SRAM))
Design Notes
The 64-ball WLCSP uses 0.4 mm ball pitch, which is below standard 6-mil (0.15 mm) via fabrication capability. Use a 4-layer PCB with microvia (laser-drilled) stack-up; the top layer fans out from each ball to a microvia pad, then inner layers carry signals. Per Microchip SAM4S hardware design notes, place a continuous ground plane under the WLCSP to improve thermal dissipation and reduce EMI. Avoid placing tall components within 2 mm of the WLCSP edges to allow for underfill rework if needed.
Decouple VDDIN and VDDIO with a 10 uF bulk + 100 nF high-frequency capacitor pair placed within 3 mm of each pin pair. The internal 1.2 V LDO requires its own 1 uF + 10 nF pair on VDDCORE. Per the SAM4S datasheet, VDDCORE should never be driven externally; it is internal-regulator output only. Adding a ferrite bead on VDDIO before the analog supply (VDDANA) reduces ADC reference noise by 6-10 dB.
Do not confuse the UUR suffix (WLCSP-64, industrial temp, tape & reel) with UUR (LQFP-64) or MNR variants - they have different ball maps and footprints. Always verify the pin 1 marker on the package top mark; for WLCSP, A1 is identified by laser marking per JEDEC. For the integrated USB Device port, place the 90-ohm differential pair with no more than 2 vias on each line and match lengths within 150 mil. Failure to do so risks USB compliance test failures.
Estimated: at 120 MHz with all peripherals active at 3.3 V, the ATSAM4S8BB-UUR core draws approximately 24 mA (200 uA/MHz x 120 MHz), dissipating 79 mW. The WLCSP-64 has a typical theta-JA of 35-45 C/W on a 4-layer JEDEC EIA/JESD51 test board, yielding a self-heating rise of 3-4 C - well within operating range. For continuous USB traffic and high peripheral utilization, monitor junction temperature; consider copper-pour heat spreading on inner layers.
Compliance Information
RoHS compliance per Microchip product page. Industrial temperature grade -40C to +85C. Not AEC-Q100 qualified - for automotive applications consider SAM V71/V70 family or ATSAM4S16C automotive variants.
