ATSAMD21J18A-MFT - 48MHz Cortex-M0+ MCU, 256KB Flash, 64-QFN
Référence : ATSAMD21J18A-MFT ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $5.42 | $5,42 |
| 10 | $4.88 | $48,80 |
| 100 | $4.05 | $405,00 |
| 500 | $3.55 | $1 775,00 |
| 1 000 | $3.12 | $3 120,00 |
| 3 000 | $2.74 | $8 220,00 |
ATSAMD21J18A-MFT Présentation
A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, and a set of on-chip peripherals. The ATSAMD21J18A-MFT's Cortex-M0+ core sits at the entry level of the 32-bit ARM Cortex-M family, balancing low power with deterministic interrupt response. The SAM D21 series is positioned within Microchip's portfolio between the lower-pin SAM D10/D11 and the larger SAM D20/D21 family variants. With on-chip USB and SERCOM multiplexing, it consolidates what would otherwise require multiple external components.
Key features include 256 KB Flash organized as 256K x 8, 32 KB SRAM, six SERCOM modules (each independently configurable), full-speed USB device/host with on-chip transceiver, a 12-bit ADC with up to 20 channels, two I2S interfaces, and a peripheral touch controller. AES 32-bit crypto accelerator and a true random number generator (TRNG) support secure applications. The integrated 32 kHz RTC oscillator and PLL-enable flexible clocking from internal or external sources.
The architecture pairs a Cortex-M0+ core with Microchip's SERCOM peripheral set and an event system that allows peripherals to interact without CPU intervention, freeing cycles for application logic. The 48 MHz clock with single-cycle multiplier achieves 2.46 CoreMark/MHz. The part is Functional Safety (FuSa) capable, supporting IEC 60730 class B libraries available separately.
Typical applications include industrial sensor nodes, home automation gateways, USB peripherals (HID/CDC/MSC), low-power IoT edge nodes, smart metering, consumer HID devices, and small touchscreen human-machine interfaces. The integrated USB avoids external PHY chips, reducing BOM cost.
Design consideration: place a 1 uF plus 100 nF decoupling network near each power pin; ensure the D+ and D+ trace impedance matches 90 ohms differential per USB specification. Use the sleepwalking idle peripherals mode to achieve sub-100 uA average system power.
This page synthesizes distributor pricing, drop-in SAMD21 alternatives, and practical low-power design notes not found in the standalone manufacturer datasheet.
Alternatives de remplacement direct pour ATSAMD21J18A-MFT — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ATSAMD21J18A-MFT (même facteur de forme et même empreinte) — différant par DAC, Operating Temperature, ADC, Package, USB.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATSAMD21J18A-MF
✅ Remplacement direct✓ En stock
$3.6 / unité
Voir la fiche technique →ATSAMD21J18A-MU
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATSAMD21J18A-AUT
✅ Remplacement direct✓ En stock
$2.63 / unité
Voir la fiche technique →ATSAMD21J18A-AU
✅ Remplacement direct✓ En stock
$2.69 / unité
Voir la fiche technique →ATSAMD21J18A-AF
✅ Remplacement direct✓ En stock
$2.99 / unité
Voir la fiche technique →ATSAMD21J18A-CU
✅ Remplacement direct✓ En stock
$2.52 / unité
Voir la fiche technique →ATSAMD21J18A-MFT Valeurs maximales et caractéristiques électriques
| Core | ARM Cortex-M0+ (32-bit) |
| Maximum CPU Clock | 48 MHz |
| Flash Memory | 256 KB (256K x 8) |
| SRAM | 32 KB |
| Supply Voltage Range | 1.62 V to 3.63 V |
| Température de fonctionnement | -40 C to +125 C |
| Boîtier | 64-QFN (9x9 mm) |
| Type de montage | Surface Mount |
| USB | USB 2.0 Full-Speed Device/Host with on-chip transceiver |
| SERCOM Modules | 6 (each configurable as I2C, SPI, or UART) |
| ADC | 12-bit, up to 350 ksps, up to 20 channels |
| DAC | 10-bit, 1 channel |
| Touch Peripheral (PTC) | Supported (mutual- and self-capacitance) |
| I2S Interfaces | 2 |
| RTC | 32 kHz internal RTC with calendar |
| Crypto Accelerator | AES 32-bit hardware accelerator |
| TRNG | True Random Number Generator |
| CoreMark/MHz | 2.46 |
| Statut RoHS | Compliant |
| MSL | 3 (168 hours) |
Configuration des broches de ATSAMD21J18A-MFT
| Broche 1 | PA00 — GPIO / XIN32 (external 32 kHz crystal input) |
| Broche 2 | PA01 — GPIO / XOUT32 (external 32 kHz crystal output) |
| Broche 3 | PA02 — GPIO / ADC_AIN[1] / AIN[2] |
| Broche 4 | PA03 — GPIO / ADC_AIN[2] |
| Broche 5 | GND — Ground |
| Broche 6 | VDDIN — Voltage regulator input supply |
| Broche 7 | VDDIO — I/O supply voltage |
| Broche 8 | PA04 — GPIO / ADC_AIN[4] / VOUT |
| Broche 9 | PA05 — GPIO / ADC_AIN[5] |
| Broche 10 | PA06 — GPIO / ADC_AIN[6] |
| Broche 11 | PA07 — GPIO / ADC_AIN[7] |
| Broche 12 | PA08 — GPIO / ADC_AIN[8] / I2S_SDI[0] |
| Broche 13 | PA09 — GPIO / ADC_AIN[9] / I2S_SDO[0] |
| Broche 14 | PA10 — GPIO / ADC_AIN[10] |
| Broche 15 | PA11 — GPIO / ADC_AIN[11] |
| Broche 16 | PA12 — GPIO / I2S_FS[0] |
| Broche 17 | PA13 — GPIO / I2S_MCK[0] |
| Broche 18 | PA14 — GPIO / I2S_SCK[0] |
| Broche 19 | PA15 — GPIO / I2S_SDI[1] |
| Broche 20 | PA16 — GPIO / I2S_SDO[1] |
| Broche 21 | PA17 — GPIO / I2S_FS[1] |
| Broche 22 | PA18 — GPIO / I2S_SCK[1] |
| Broche 23 | PA19 — GPIO / I2S_MCK[1] |
| Broche 24 | PA20 — GPIO / I2S_SDI[2] |
| Broche 25 | PA21 — GPIO / I2S_SDO[2] |
| Broche 26 | PA22 — GPIO / I2S_FS[2] |
| Broche 27 | PA23 — GPIO / I2S_SCK[2] |
| Broche 28 | PA24 — GPIO / USB_DM |
| Broche 29 | PA25 — GPIO / USB_DP |
| Broche 30 | GND — Ground |
| Broche 31 | VDDIO — I/O supply voltage |
| Broche 32 | PB00 — GPIO |
| Broche 33 | PB01 — GPIO |
| Broche 34 | PB02 — GPIO / ADC_AIN[14] |
| Broche 35 | PB03 — GPIO / ADC_AIN[15] |
| Broche 36 | PB04 — GPIO |
| Broche 37 | PB05 — GPIO |
| Broche 38 | PB06 — GPIO |
| Broche 39 | PB07 — GPIO |
| Broche 40 | PB08 — GPIO |
| Broche 41 | PB09 — GPIO |
| Broche 42 | PB10 — GPIO |
| Broche 43 | PB11 — GPIO |
| Broche 44 | PB12 — GPIO / NMI |
| Broche 45 | PB13 — GPIO |
| Broche 46 | PB14 — GPIO |
| Broche 47 | PB15 — GPIO |
| Broche 48 | PB16 — GPIO |
| Broche 49 | PB17 — GPIO |
| Broche 50 | PB18 — GPIO |
| Broche 51 | PB19 — GPIO |
| Broche 52 | PB20 — GPIO |
| Broche 53 | PB21 — GPIO |
| Broche 54 | PB22 — GPIO |
| Broche 55 | PB23 — GPIO |
| Broche 56 | PB24 — GPIO |
| Broche 57 | PB25 — GPIO |
| Broche 58 | PA27 — GPIO |
| Broche 59 | PA28 — GPIO / SWDIO |
| Broche 60 | PA29 — GPIO / SWCLK |
| Broche 61 | PA30 — GPIO / SWO |
| Broche 62 | PA31 — GPIO |
| Broche 63 | RESET — Reset input, active-low |
| Broche 64 | VDDANA — Analog supply voltage (must connect to VDDIN externally) |
Applications typiques
ATSAMD21J18A-MFT convient pour 6 applications: Industrial Sensor Nodes, USB HID / CDC Devices, Smart Home / Consumer IoT, Smart Metering, Touch-based Human-Machine Interface, Home Automation Gateways.
Industrial Sensor Nodes
The ATSAMD21J18A-MFT is well matched to industrial sensor nodes that demand precise analog measurement alongside a low sleep current budget. The integrated 12-bit 350 ksps ADC with up to 20 channels handles thermocouple, 4-20 mA, and bridge-sensor signal chains without an external analog front end. Six SERCOM ports can run I2C sensors, SPI flash, and RS-485 UART simultaneously, while Standby mode (1.7 uA typical with RTC running per the SAM D21 datasheet) lets a battery-powered node sleep for years. Place 100 nF and 1 uF decoupling on each VDD pin and use sleepwalking to wake the ADC only on threshold crossings, keeping the average system current under 100 uA.
Recommandé
USB HID / CDC Devices
USB keyboards, mice, CDC virtual COM ports, and custom HID peripherals benefit from the ATSAMD21J18A-MFT's integrated USB 2.0 Full-Speed controller with on-chip transceiver. The peripheral handles device and limited host modes without an external PHY, shrinking BOM and freeing the 48 MHz Cortex-M0+ core to run application logic. With 256 KB Flash and 32 KB SRAM, the part comfortably hosts USB stacks such as LUFA or TinyUSB plus application firmware. Route D+/D- as a 90 ohm differential pair and provide a 1.5 kohm pull-up on D+ in software to enumerate as full-speed.
Recommandé
Smart Home / Consumer IoT
Smart home hubs, lighting controllers, and consumer IoT end nodes benefit from the ATSAMD21J18A-MFT's 1.62-3.63 V single-supply operation, which allows direct connection to 2xAA batteries or USB 5 V via an LDO. The peripheral touch controller (PTC) supports mutual- and self-capacitance touch buttons and sliders, replacing mechanical switches on sealed enclosures. Six SERCOMs accommodate Wi-Fi/BLE module UART, sensor I2C/SPI buses, and a debug UART. Backup mode at sub-1 uA with RTC retention supports coin-cell wake-on-touch designs that last several years.
Recommandé
Smart Metering
Electricity, water, and gas meters rely on the ATSAMD21J18A-MFT for integrated metering peripherals and long-term reliability. The 12-bit ADC with differential inputs handles direct sensor signal conditioning, while the integrated RTC with calendar supports time-of-use billing. AES 32-bit hardware acceleration protects wireless M-Bus or LoRaWAN payloads, and the TRNG supports secure key generation. Industrial -40 to +125 C temperature rating matches outdoor meter environments, and 256 KB Flash holds a full metering firmware plus OTA bootloader.
Recommandé
Touch-based Human-Machine Interface
Small HMI panels with capacitive touch benefit from the ATSAMD21J18A-MFT's integrated Peripheral Touch Controller (PTC) and 12-bit ADC. Mutual-capacitance supports up to 256 touch channels, allowing slider, wheel, and matrix keypad interfaces without an external touch IC. Two I2S interfaces drive digital audio for beep feedback, while 256 KB Flash holds LVGL-style graphics libraries plus touch processing. Configure the PTC scan in standby with wake-on-touch to achieve responsive UI with sub-50 uA average current.
Recommandé
Home Automation Gateways
Home automation gateways that bridge Zigbee, BLE, Wi-Fi, and sub-GHz radios benefit from the ATSAMD21J18A-MFT's six SERCOM interfaces and high-performance 48 MHz core. Each SERCOM can independently run UART to a host radio module, SPI to a display or flash, and I2C to environmental sensors, while the USB port provides a wired debug or CDC link to a host processor. AES and TRNG secure the local key store, and 32 KB SRAM comfortably buffers MQTT message queues. Industrial temperature rating supports installation in unheated utility spaces.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATSAMD21J18A-MFT — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATSAMD21J18A-MF | ATSAMD21J18A-MU | ATSAMD21J18A-AUT | ATSAMD21J18A-AU | ATSAMD21J18A-AF | ATSAMD21J18A-CU |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| Flash / SRAM | 256 KB / 32 KB | 256 KB / 32 KB | 256 KB / 32 KB | 256 KB / 32 KB | 256 KB / 32 KB | 256 KB / 32 KB | 256 KB / 32 KB |
| Max CPU Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| AEC-Q100 Qualification | No | No | No | Yes | Yes | Yes | Yes |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +85 C (automotive) | -40 C to +85 C (automotive) | -40 C to +85 C (automotive) | -40 C to +85 C (automotive) |
| Packaging | Tape & Reel | Tray | Tray | Tape & Reel | Tray | Tray | Tray |
| Approx Unit Price (qty 1) | $5.42 | $5.20 | $5.20 | $6.10 | $5.90 | $5.90 | $6.40 |
Principaux différenciateurs
- Industrial temperature grading +125 C without AEC-Q100 cost premium (vs ATSAMD21J18A-AUT)
- Tape and Reel packaging optimized for high-volume SMT (vs ATSAMD21J18A-MF)
- Six SERCOM peripherals for high I/O flexibility (vs ATSAMD21E17A-MFT)
Notes de conception
Place a 1 uF X7R ceramic plus a 100 nF X7R ceramic on each VDDIN, VDDIO, and VDDANA pin; the VDDANA pin must be tied externally to VDDIN to prevent ADC reference drift. According to the SAM D21 datasheet, VDDIO can be tied to VDDIN for single-supply operation. Add a bulk 10 uF tantalum or polymer cap at the regulator input to suppress load transients during USB enumeration.
Route the USB D+/D- pair as a 90 ohm differential pair with matched trace lengths, no stubs, and a continuous reference ground plane below. Keep the differential pair away from switching signals and route over an unbroken ground pour to meet USB 2.0 Full-Speed signal integrity requirements. Decouple the VDDIO that feeds the USB transceiver with a 100 nF cap within 2 mm of the pin.
Do not exceed the absolute maximum VDD of 4.0 V or apply voltage to any GPIO before VDDIO is powered. Per the SAM D21 datasheet, the NRESET pin has an internal pull-up; drive it low for at least 100 ns to reset the device. Configure the BOD33 (Brown-Out Detector 3.3V) early in firmware to ensure safe reset behavior in brown-out conditions.
Estimated: at 48 MHz and full peripheral activity, the 64-QFN package dissipates approximately 60 mW (1.2 V core x ~50 mA active current per the SAM D21 datasheet). The exposed pad must be soldered to a copper pour of at least 100 mm^2 to keep junction temperature rise under 10 C in still air; without this thermal pad connection the device can overheat in industrial -40 to +125 C environments.
Use the SERCOM peripheral to route I2C, SPI, and UART on the same pins without silicon rework. Each SERCOM supports up to four I/O pins per channel; reserve SERCOM0 and SERCOM1 for high-speed peripherals (SPI flash, USB-CDC bridge) and SERCOM2-5 for sensor I/O. Configure drive strength to PERIPHERAL_LOW for low-power sensors to reduce EMI in battery designs.
Informations de conformité
RoHS/REACH compliance per Microchip product page. AEC-Q100 not applicable for MFT; choose AUT variant for AEC-Q100 automotive.
