ATSAMD21G16B-AFT - 48MHz Cortex-M0+ 64KB Flash MCU | Microchip
Référence : ATSAMD21G16B-AFT ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $3.95 | $3,95 |
| 10 | $3.55 | $35,50 |
| 100 | $3.12 | $312,00 |
| 500 | $2.78 | $1 390,00 |
| 1 000 | $2.45 | $2 450,00 |
ATSAMD21G16B-AFT Présentation
A microcontroller (MCU) is a single-chip computer containing a processor core, program memory (Flash), working memory (RAM), and configurable peripherals. The ARM Cortex-M0+ is the most energy-efficient core in the ARM Cortex-M family, optimized for low-power embedded applications where deterministic real-time response, small code footprint, and minimal active current are essential. The SAM D21 series uses a Harvard bus architecture with separate code and data buses, enabling simultaneous fetch and memory access for higher throughput at lower clock rates.
Key differentiating features include 6 SERCOM modules (each independently assignable as UART, SPI, or I2C), a 12-bit 350ksps ADC with up to 14 analog channels, a 10-bit 350ksys DAC, and a USB 2.0 Full-Speed device interface with integrated PHY. The device supports Sleepwalking peripherals and Sleep Modes (Idle, Standby, Backup, and Off), with wake-up times under 5 us from Standby, making it suitable for battery-powered sensor nodes and always-on IoT edge devices.
Typical applications include IoT sensor nodes, wearable fitness bands, consumer appliance control panels, USB human-interface devices (HIDs), and low-cost industrial control modules. The SAM D21 ecosystem is supported by Microchip Studio 7, Atmel START, and the MPLAB X IDE toolchain, with a rich library of software framework examples and middleware (ASF v3 / Microchip CodeVision / Harmony 3) that accelerate firmware development. The 48-TQFP package provides easy hand-soldering and breadboard-friendly 0.5 mm pitch pads, which is convenient for prototype work.
This page synthesizes distributor pricing, drop-in SAMD21 alternatives, and practical design notes not found on the manufacturer product page, with cross-brand cross-references sourced from live distributor data. Pricing reflects current market rates as of 2026-09-21 and may vary by quantity break and supplier allocation.
Alternatives de remplacement direct pour ATSAMD21G16B-AFT — 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 ATSAMD21G16B-AFT (même facteur de forme et même empreinte) — différant par Package, DAC, USB, ADC, RoHS Status.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATSAMD21G16B-MUT
✅ Remplacement direct✓ En stock
$2.05 / unité
Voir la fiche technique →ATSAMD21G15B-AF
✅ Remplacement direct✓ En stock
$1.78 / unité
Voir la fiche technique →ATSAMD21G15B-AU
✅ Remplacement direct✓ En stock
$1.65 / unité
Voir la fiche technique →ATSAMD21G15B-MUT
✅ Remplacement direct✓ En stock
$1.78 / unité
Voir la fiche technique →ATSAMD21E17A-MFT
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$2.55 / unité
Voir la fiche technique →ATSAMD21E17A-AF
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$2.34 / unité
Voir la fiche technique →ATSAMD21G16B-AFT Valeurs maximales et caractéristiques électriques
| Core | ARM Cortex-M0+ (32-bit) |
| Series | SAM D21 (SAM D21G family) |
| Fréquence d'horloge maximale | 48 MHz |
| Program Memory (Flash) | 64 KB (64K x 8) |
| SRAM | 8 KB |
| Supply Voltage (VDDIN) | 1.62 V to 3.63 V |
| Température de fonctionnement | -40 C to +125 C (industrial) |
| ADC | 12-bit, up to 350 ksps |
| DAC | 10-bit, 350 ksps |
| SERCOM Modules | 6 (configurable UART/SPI/I2C) |
| USB | USB 2.0 Full-Speed Device with on-chip PHY |
| Boîtier | 48-pin TQFP, 7x7 mm, 0.5 mm pitch |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant (Green / Pb-free) |
Guide de configuration des broches du ATSAMD21G16B-AFT 48-pin tqfp, 7x7 mm, 0.5 mm pitch
Configuration des broches du ATSAMD21G16B-AFT (boîtier 48-pin tqfp, 7x7 mm, 0.5 mm pitch). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour ATSAMD21G16B-AFT.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ATSAMD21G16B-AFT convient pour 6 applications: IoT Sensor Node, Wearable Fitness Band, USB HID Device, Consumer Appliance Control Panel, Industrial Sensor Module, Battery Charger Controller.
IoT Sensor Node
The ATSAMD21G16B-AFT fits battery-operated IoT sensor nodes due to its Cortex-M0+ efficiency, multiple SERCOM channels for I2C/SPI sensor interfaces, 12-bit ADC for analog sensor reading, and ultra-low Sleep current under 5 uA. The 64 KB Flash accommodates sensor-fusion algorithms, BLE/LoRa soft-stack integration, and OTA update logic. The six SERCOM channels allow simultaneous sensor, display, and radio bus connectivity without I/O expansion. Compared to older 8-bit AVR MCUs, the SAMD21 delivers 30-50x more DMIPS at similar or lower active power.
Recommandé
Wearable Fitness Band
For wearable fitness bands, the ATSAMD21G16B-AFT delivers the right balance of low power, integrated peripherals, and small footprint. The 48 MHz Cortex-M0+ core processes step counting, accelerometer fusion, and heart-rate algorithms well within the 64 KB Flash budget. The 12-bit ADC handles bio-impedance measurement for heart rate, and the 10-bit DAC drives LED pulse oximetry. Sleep current under 5 uA in Standby enables 7-day battery life on a 100 mAh coin cell.
Recommandé
USB HID Device
The ATSAMD21G16B-AFT integrates a USB 2.0 Full-Speed device controller and on-chip transceiver, making it a natural choice for USB HID devices like keyboards, mice, and game controllers. The 64 KB Flash accommodates HID descriptors and composite device stacks; 8 KB SRAM handles HID report buffers and CDC streams. Microchip's ASF/Harmony 3 USB stack provides ready examples for HID, CDC, MSD, and vendor-class firmware, reducing development time from weeks to days.
Recommandé
Consumer Appliance Control Panel
For consumer appliance control panels (coffee machines, washing machines, induction cookers), the ATSAMD21G16B-AFT provides industrial -40C to +125C temperature range and reliable touch-button and LED-driving capability. The 12-bit ADC reads temperature, motor current, and water-level sensors; multiple SERCOM channels drive LED displays, I2C sensors, and SPI flash. The 48-pin TQFP 7x7 mm is breadboard-friendly for prototype iteration and supports hand-soldering rework during development.
Recommandé
Industrial Sensor Module
The ATSAMD21G16B-AFT is well-suited to industrial sensor modules requiring industrial -40C to +125C operating range, 4-20 mA loop interfaces, and analog sensor reading. The 12-bit ADC with hardware averaging and oversampling delivers clean readings from RTDs, thermocouples, and bridge sensors. Multiple SERCOM channels support RS-485, Modbus, and IO-Link communication. The 64 KB Flash and 8 KB SRAM accommodate sensor linearization, calibration tables, and industry-standard protocol stacks.
Recommandé
Battery Charger Controller
For battery charger controllers in consumer and industrial products, the ATSAMD21G16B-AFT provides 12-bit ADC for voltage/current sensing, PWM timers for synchronous buck control, and SERCOM for SMBus/PMBus communication. The 48-pin TQFP exposes enough GPIO for charger status LEDs, enable signals, and safety interlocks. Sleep modes below 5 uA enable idle-mode standby without draining the battery when the device is idle or unplugged.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATSAMD21G16B-AFT — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATSAMD21G16B-MUT | ATSAMD21G15B-AF | ATSAMD21G15B-AU | ATSAMD21G15B-MUT | ATSAMD21E17A-MFT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-TQFP (7x7 mm) | 48-QFN (MUT) - same pinout | 48-TQFP (7x7) - same | 48-TQFP (7x7) - same | 48-QFN (MUT) - same pinout | 48-QFN (MFT) - same pinout |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Flash Memory | 64 KB | 64 KB | 32 KB (-50%) | 32 KB (-50%) | 32 KB (-50%) | 128 KB (+100%) |
| SRAM | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 16 KB (+100%) |
| Maximum Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Supply 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 | 1.62 V to 3.63 V | 1.62 V to 3.63 V |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +85 C | -40 C to +125 C | -40 C to +125 C |
| USB 2.0 FS | Yes (on-chip PHY) | Yes (on-chip PHY) | Yes (on-chip PHY) | Yes (on-chip PHY) | Yes (on-chip PHY) | Yes (on-chip PHY) |
Principaux différenciateurs
- 64KB Flash in 48-pin TQFP at industrial -40C to +125C (vs ATSAMD21G15B-AF)
- On-chip USB 2.0 Full-Speed PHY (vs ATSAMD20G18A-AU)
- Six SERCOM channels (vs ATSAMD21E16B-AU)
Notes de conception
Decouple VDDIN with a 100 nF X7R ceramic capacitor placed within 5 mm of the pin, plus a bulk 4.7 uF to 10 uF low-ESR capacitor on the same supply rail. The SAM D21 internal voltage regulator requires both capacitors for stable PLL operation; omitting the bulk capacitor causes intermittent startup failures or dropped USB packets at cold temperatures. For battery applications, the AT-SOAD level standby current is reached only after disabling all peripheral clocks and the BOD, per Microchip SAM D21 datasheet section 'Low-Power Modes'.
Route the USB DP/DM traces as a 90-ohm differential pair with maximum 3 mm length matching on a continuous ground reference plane. Place the USB series ferrite and ESD protection diode (USBLC6-2SC6 or equivalent) within 10 mm of the USB connector. The exposed pad (TQFP-48 has no exposed pad, but QFN-48 does) on the QFN variant must be soldered to a thermal pad with 9 thermal vias to the ground plane for 1 W dissipation. The Microchip SAM D21 hardware design checklist provides reference layouts.
Do not enable the USB peripheral before configuring the GCLK and DFLL/PLL for 48 MHz - USB requires a precise 48 MHz clock within +/-2500 ppm tolerance. Brown-out reset (BOD) voltage threshold must be set to a value below the minimum expected supply at power-up; using factory-default BOD 3.30 V can cause unexpected reset on noisy supplies. The NVM user row configuration bits (BOOTPROT, EEPROM, LOCKBITS) must be set deliberately; locking without testing can brick the device permanently.
Keep SERCOM signal traces under 50 mm to avoid EMI and signal-integrity issues; longer traces require series damping resistors near the driver. Group SERCOM0/1/2/3/4/5 pins and route together to maintain consistent firmware organization. ADC analog inputs should be isolated from switching digital signals by a ground moat; use a separate analog ground plane tied to the digital ground at a single point near the MCU.
Use 4-layer PCB stack-up with continuous ground plane below the MCU for the 48-pin TQFP; 2-layer boards can work for low-speed SERCOM applications but are marginal for USB. Add 22 ohm to 33 ohm series resistors on USB DP/DM close to the MCU per Microchip USB hardware design guide. Crystal traces should be as short as possible, surrounded by ground pour, and loaded with the datasheet-specified load capacitance matching the crystal manufacturer's tolerance.
Informations de conformité
RoHS compliant per Microchip product page. Green compound / Pb-free matte-tin finish. AEC-Q100 not qualified - SAM D21 series targets consumer/industrial not automotive ASIL; choose SAM RH71 or SAM S70 for AEC-Q100. REACH SVHC and conflict minerals compliant per Microchip regulatory declarations.
