ATSAMD21J18A-MUT - 48MHz ARM Cortex-M0+ 256KB Flash MCU | Microchip
N.º de pieza: ATSAMD21J18A-MUT ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $5.12 | $5,12 |
| 10 | $4.61 | $46,10 |
| 100 | $4.09 | $409,00 |
| 500 | $3.68 | $1.840,00 |
| 1.000 | $3.27 | $3.270,00 |
ATSAMD21J18A-MUT Descripción general
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), data memory (SRAM), and configurable peripherals. The ARM Cortex-M0+ is a 32-bit processor core optimized for low-power, deterministic embedded applications and sits within the broader ARM Cortex-M family hierarchy (Cortex-M0 -> Cortex-M0+ -> Cortex-M3 -> Cortex-M4 -> Cortex-M7). The SAM D21 family occupies the entry-level, low-power end of the Microchip Cortex-M lineup; within that family, the ATSAMD21J18A variant provides the largest pin count (64 pins) and largest Flash option, enabling connectivity-rich designs that smaller-pinned SAMD21G or SAMD21E variants cannot serve.
Key features include 256 KB Flash, 32 KB SRAM, full-speed USB 2.0 with on-chip transceiver, six SERCOM modules that can each be configured as UART, SPI, or I2C, a 12-bit 350 ksps ADC with up to 20 channels, a 10-bit DAC, and two analog comparators. SleepWalking peripherals and the Event System allow the core to remain in deep sleep while peripherals react autonomously, drawing only a few microamps.
The device is built on a low-power CMOS process and supports six software-selectable sleep modes (IDLE, STANDBY, BACKUP, OFF) with sub-microsecond wake-up. The integrated Full-Speed USB PHY eliminates external crystal requirements for USB, while SERCOM multiplexing lets designers assign digital interfaces to most GPIO pins, simplifying PCB routing across board variants.
Typical applications include home automation gateways, consumer electronics, smart metering, industrial sensor nodes, USB peripherals (HID, CDC, mass storage), wearable fitness devices, and low-power IoT end nodes. The wide operating voltage and rich peripheral mix make it well suited for battery-powered products requiring USB connectivity or multiple serial interfaces.
When designing with the ATSAMD21J18A, use MPLAB X IDE or Microchip Studio with the ASF/Atmel Software Framework, and program/debug with an Atmel-ICE or MPLAB Snap. Decouple VDDCORE and VDDIO with at least 100 nF plus 4.7 uF bulk capacitors placed as close to the pins as possible.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, helping procurement and firmware engineers evaluate the ATSAMD21J18A-MUT for new designs or as a substitute for other Cortex-M0+ MCU candidates.
Alternativas directas para ATSAMD21J18A-MUT — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ATSAMD21J18A-MUT (mismo factor de forma y huella) — difiere en Package, Operating Temperature, ADC, DAC, USB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ATSAMD21J18A-AUT
✅ Sustitución directa✓ En stock
$2.63 / unidad
Ver hoja de datos →ATSAMD21J18A-MUT Valores máximos y características eléctricas
| Core Architecture | ARM Cortex-M0+ (32-bit) |
| Maximum Clock Speed | 48 MHz |
| Flash Memory | 256 KB (256K x 8) |
| SRAM | 32 KB |
| Operating Voltage Range | 1.62 V to 3.63 V |
| Encapsulado | 64-pin QFN (9x9 mm) |
| USB | USB 2.0 Full-Speed with on-chip transceiver |
| SERCOM Modules | 6 (configurable as UART/SPI/I2C) |
| ADC | 12-bit, up to 20 channels, 350 ksps |
| DAC | 10-bit, 1 channel |
| Analog Comparators | 2 |
| Event System | 6 channels |
| Sleep Modes | IDLE, STANDBY, BACKUP, OFF |
| Temperatura de funcionamiento | -40C to +85C (industrial) |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
| Functional Safety | FuSa (SAM D21J family) |
Configuración de pines de ATSAMD21J18A-MUT
| Pin 1 | VDD — Digital supply voltage |
| Pin 2 | GND — Ground |
| Pin 3 | PA00 — GPIO / SERCOM1 PAD0 |
| Pin 4 | PA01 — GPIO / SERCOM1 PAD1 |
| Pin 5 | PA02 — GPIO / ADC AIN0 |
| Pin 6 | PA03 — GPIO / ADC AIN1 / VREFA |
| Pin 7 | PA04 — GPIO / ADC AIN2 / VREFB |
| Pin 8 | PA05 — GPIO / ADC AIN3 |
| Pin 9 | PA06 — GPIO / ADC AIN4 |
| Pin 10 | PA07 — GPIO / ADC AIN5 |
| Pin 11 | PA08 — GPIO / SERCOM0 PAD0 / I2S |
| Pin 12 | PA09 — GPIO / SERCOM0 PAD1 / I2S |
| Pin 13 | PA10 — GPIO / SERCOM2 PAD0 |
| Pin 14 | PA11 — GPIO / SERCOM2 PAD1 |
| Pin 15 | PA12 — GPIO / SERCOM4 PAD0 |
| Pin 16 | PA13 — GPIO / SERCOM4 PAD1 |
| Pin 17 | PA14 — GPIO / SERCOM3 PAD0 |
| Pin 18 | PA15 — GPIO / SERCOM3 PAD1 |
| Pin 19 | PA16 — GPIO / SERCOM1 PAD0 |
| Pin 20 | PA17 — GPIO / SERCOM1 PAD1 |
| Pin 21 | PA18 — GPIO / SERCOM3 PAD2 |
| Pin 22 | PA19 — GPIO / SERCOM3 PAD3 |
| Pin 23 | PA20 — GPIO / SERCOM5 PAD2 |
| Pin 24 | PA21 — GPIO / SERCOM5 PAD3 |
| Pin 25 | PA22 — GPIO / SERCOM3 PAD0 |
| Pin 26 | PA23 — GPIO / SERCOM3 PAD1 |
| Pin 27 | PA24 — GPIO / SERCOM5 PAD0 / USB D- |
| Pin 28 | PA25 — GPIO / SERCOM5 PAD1 / USB D+ |
| Pin 29 | PA27 — GPIO |
| Pin 30 | PA28 — GPIO |
| Pin 31 | PA30 — GPIO / SWCLK |
| Pin 32 | PA31 — GPIO / SWDIO |
| Pin 33 | PB00 — GPIO |
| Pin 34 | PB01 — GPIO |
| Pin 35 | PB02 — GPIO / SERCOM5 PAD0 |
| Pin 36 | PB03 — GPIO / SERCOM5 PAD1 |
| Pin 37 | PB04 — GPIO / SERCOM3 PAD0 |
| Pin 38 | PB05 — GPIO / SERCOM3 PAD1 |
| Pin 39 | PB06 — GPIO / SERCOM3 PAD2 |
| Pin 40 | PB07 — GPIO / SERCOM3 PAD3 |
| Pin 41 | PB08 — GPIO / SERCOM4 PAD0 |
| Pin 42 | PB09 — GPIO / SERCOM4 PAD1 |
| Pin 43 | PB10 — GPIO / SERCOM4 PAD2 |
| Pin 44 | PB11 — GPIO / SERCOM4 PAD3 |
| Pin 45 | PB12 — GPIO / SERCOM4 PAD0 |
| Pin 46 | PB13 — GPIO / SERCOM4 PAD1 |
| Pin 47 | PB14 — GPIO / SERCOM4 PAD2 |
| Pin 48 | PB15 — GPIO / SERCOM4 PAD3 |
| Pin 49 | PB16 — GPIO / SERCOM5 PAD0 |
| Pin 50 | PB17 — GPIO / SERCOM5 PAD1 |
| Pin 51 | PB18 — GPIO |
| Pin 52 | PB19 — GPIO |
| Pin 53 | PB20 — GPIO |
| Pin 54 | PB21 — GPIO |
| Pin 55 | PB22 — GPIO |
| Pin 56 | PB23 — GPIO |
| Pin 57 | PB24 — GPIO |
| Pin 58 | PB25 — GPIO |
| Pin 59 | PC00 — GPIO |
| Pin 60 | PC01 — GPIO |
| Pin 61 | PC02 — GPIO |
| Pin 62 | PC03 — GPIO |
| Pin 63 | GND — Ground |
| Pin 64 | VDD — Digital supply voltage |
Aplicaciones típicas
ATSAMD21J18A-MUT es adecuado para 6 aplicacións: Home Automation Gateway, USB HID / CDC Peripheral, Smart Metering / Energy Monitor, Industrial Sensor Node, Wearable Fitness Device, Low-Power IoT End Node.
Home Automation Gateway
The ATSAMD21J18A-MUT is a strong fit for home automation gateways thanks to its 256 KB Flash and 32 KB SRAM, which comfortably fit TCP/IP stacks (LwIP), Zigbee/Wi-Fi co-processor command parsing, and OTA bootloader logic. Six configurable SERCOM modules let the gateway drive multiple sensor buses (UART for HVAC controllers, I2C for sensor hubs, SPI for radio modules) without external muxing chips. The integrated Full-Speed USB 2.0 PHY simplifies local console or CDC debugging without external crystals, and the 1.62-3.63 V operating range supports direct battery or 3.3 V regulator rails. SleepWalking and Event System features keep idle current below 10 uA in standby, extending battery life in wireless bridge designs.
Recomendado
USB HID / CDC Peripheral
The ATSAMD21J18A-MUT is ideal for USB HID, CDC, and mass-storage peripherals because of its on-chip Full-Speed USB 2.0 PHY and transceiver. The 256 KB Flash holds the USB stack plus application firmware, while 32 KB SRAM handles descriptor buffers and HID report queues. The SAM D21 family datasheet DS40001882 confirms USB device operation with internal 48 MHz PLL without an external USB crystal when the PLL is locked to the system clock, reducing BOM cost. Six SERCOMs allow concurrent UART bridge, SPI flash, and I2C sensor interfaces alongside USB, perfect for USB-to-multi-protocol bridge dongles.
Recomendado
Smart Metering / Energy Monitor
Smart metering and energy monitoring applications benefit from the ATSAMD21J18A-MUT's 12-bit 350 ksps ADC with up to 20 channels for current/voltage sensing on multiple phases simultaneously. The integrated 10-bit DAC drives analog front-end calibration signals, and two analog comparators handle zero-crossing detection for power-line synchronization without external components. Six SERCOMs connect to UART-modulated metrology ICs, I2C EEPROMs for log storage, and SPI displays for local readout. Sub-microamp standby current from BACKUP and OFF sleep modes extends battery life on battery-backed metering peripherals per Microchip power benchmarks.
Recomendado
Industrial Sensor Node
Industrial sensor nodes leverage the ATSAMD21J18A-MUT's industrial -40C to +85C temperature range, rich ADC, and SERCOM flexibility. The 12-bit ADC samples multiple analog sensor channels at 350 ksps for vibration, temperature, or pressure sensing, while SERCOMs handle RS-485 (UART), SPI for digital sensors, and I2C for EEPROM. The 256 KB Flash accommodates Modbus or CANopen protocol stacks. Functional Safety (FuSa) features in the SAM D21J family support safety-critical industrial applications requiring IEC 61508 documentation, which the smaller SAMD21G/E variants lack.
Recomendado
Wearable Fitness Device
Wearable fitness devices benefit from the ATSAMD21J18A-MUT's combination of ultra-low deep-sleep current, integrated USB for charging/data, and SERCOM flexibility for biometric sensor interfaces. The 6-channel Event System allows the Cortex-M0+ core to remain in BACKUP sleep mode while the ADC and comparators wake it on heart-rate or motion events, achieving weeks of battery life on small Li-ion or coin cells. The 64-pin QFN package (9x9 mm) fits within compact wearable enclosures, and the 1.62-3.63 V operating range supports direct Li-ion battery operation without an LDO.
Recomendado
Low-Power IoT End Node
Low-power IoT end nodes running on coin cells or energy harvesting are a primary use case for the ATSAMD21J18A-MUT. The SAM D21 datasheet DS40001882 cites typical deep-sleep current below 5 uA with RTC running, extending battery life to years on appropriate duty cycles. Six SERCOMs interface to LoRa, BLE, or sub-GHz radio modules via SPI/UART, and the 12-bit ADC reads environmental sensors directly. Functional Safety features in the SAM D21J family support safety-critical IoT deployments such as gas detectors or medical peripherals, while the 64-pin QFN package exposes enough GPIO for multi-radio coexistence.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ATSAMD21J18A-MUT — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ATSAMD21J18A-AUT | ATSAMD21J17A-AU | ATSAMD21G18A-MU |
|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - same | 64-TQFP | 48-QFN |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Max Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash | 256 KB | 256 KB | 256 KB | 256 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB |
| Operating Voltage | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V |
| Operating Temperature | -40C to +85C (industrial) | -40C to +125C (automotive) | -40C to +85C | -40C to +85C |
| GPIO Count | 52 (64-pin QFN) | 52 | 52 | 38 (48-pin) |
| Functional Safety (FuSa) | Yes (SAM D21J family) | Yes | Yes | No (SAM D21G family) |
Diferenciadores clave
- Largest pin-count variant in SAM D21 family with FuSa support (frente a ATSAMD21G18A-MU)
- Identical silicon with automotive temperature grade available (frente a ATSAMD21J18A-AUT)
- 64-pin TQFP option for hand-solder and through-hole debugging (frente a ATSAMD21J17A-AU)
Notas de diseño
Decouple VDDCORE with a 100 nF ceramic capacitor placed within 5 mm of the pin, and add a 4.7 uF bulk capacitor on VDDIO. Per the SAM D21 datasheet DS40001882, VDDIO and VDDCORE can be tied together for simple single-supply designs operating at 3.3 V, but separating them allows the core to enter BACKUP mode while keeping I/O ring active for wake-on-interrupt. Add a 10 kohm pull-up on RESET to ensure proper startup if not driven by the debugger.
The 64-pin QFN (9x9 mm) package requires an exposed pad (EP) that MUST be soldered to the ground plane for thermal dissipation and electrical performance. Use a via array (typically 4-9 thermal vias, 0.3 mm drill) under the EP to ground. For USB applications, route the USB D+/D- differential pair (PA24/PA25) as a 90-ohm differential impedance match with length matching within 150 mil per USB 2.0 FS spec. Keep the 32 kHz crystal traces short and surrounded by ground.
When migrating code from SAMD21G/E variants, ensure unused pins on the J18A package are configured correctly - the additional 16 GPIO pins on PB and PC ports must be initialized even if unused to prevent floating input current draw. The SERCOM peripheral pin mappings differ between SAMD21 packages; verify SERCOM PAD assignments against the DS40001882 pinout table for the 64-pin variant, not the 48-pin. The on-chip USB PHY may require a 1 uF capacitor on VBUS if USB bus-powered operation is needed.
Información de cumplimiento
RoHS and REACH compliant per Microchip product page. The MUT variant is NOT AEC-Q100 qualified - choose ATSAMD21J18A-AUT for AEC-Q100 automotive designs. The MUT is industrial grade (-40C to +85C).
