ATSAMC21G18A-ANT - 48MHz Cortex-M0+ MCU 256KB Flash | Microchip
MPN: ATSAMC21G18A-ANT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.3 | $8.30 |
| 10 | $7.47 | $74.70 |
| 100 | $6.06 | $606.00 |
| 500 | $5.18 | $2,590.00 |
| 1,000 | $4.62 | $4,620.00 |
ATSAMC21G18A-ANT Overview
What is a Cortex-M0+ microcontroller? A Cortex-M0+ is an ARM Holdings 32-bit processor core designed for energy-efficient embedded applications; in the SAM C21 family it is paired with a 5 V-tolerant I/O ring and Functional Safety (FuSa) features that let the part operate directly from industrial 24 V rails after a pre-regulator. The ATSAMC21G18A-ANT belongs to the SAM C21 family of 5 V Cortex-M0+ devices designed for industrial and commercial applications in noisy environments, sitting within Microchip's broader MCU hierarchy: Cortex-M0+ -> ARM Cortex-M -> 32-bit MCU -> Embedded Microcontroller -> Semiconductor.
Key features include an integrated CAN-FD controller for automotive network bridging, six SERCOM modules that can each be configured as I2C, SPI, or UART, a 12-bit differential ADC with up to 1 Msps, and a 16-bit PWM timer suited for advanced motor control. The Peripheral Touch Controller supports capacitive button, slider, and wheel sensing without an external touch IC.
Technically, the part combines a single-cycle hardware multiplier with an MPU, a Micro Trace Buffer for lightweight instruction tracing, and 8 KB of independent self-programmable Flash reserved for EEPROM emulation, which preserves the main array for firmware updates. The 5 V-tolerant I/O ring simplifies interface to legacy 5 V sensors and actuators common on factory floors.
Typical applications include industrial HMI panels, BLDC motor controllers, building automation sensors, automotive body and lighting controllers, and CAN-FD networked sensor nodes. Each application benefits from the combination of robust 5 V I/O, integrated touch, and CAN-FD.
When designing, ensure the 48-pin TQFP land pattern is used and provide bulk decoupling of 100 nF plus 4.7 µF near the VDD pins; the CAN-FD peripheral requires a certified transceiver such as the MCP2562FD for ISO 11898-1 compliance.
This page synthesizes distributor pricing, package-compatible alternatives, and practical design notes that are not consolidated in the manufacturer datasheet alone.
Drop-in alternatives for ATSAMC21G18A-ANT — 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 ATSAMC21G18A-ANT (same form factor and footprint) — differing in Package, Operating Temperature, RoHS Status, SRAM, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMC21G17A-AUT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.78 / Unit
View Datasheet →ATSAMC21G16A-AUT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.35 / Unit
View Datasheet →ATSAMC20G18A-ANT
✅ Drop-In✓ In Stock
$2.34 / Unit
View Datasheet →ATSAMC21G18A-AUT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.78 / Unit
View Datasheet →ATSAMC20N18A-ANT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.1 / Unit
View Datasheet →ATSAMC21G18A-ANT Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M0+ |
| Bit Width | 32-bit |
| Maximum Clock Frequency | 48 MHz |
| Flash Memory | 256 KB (256K x 8) |
| SRAM | 32 KB |
| Auxiliary Flash (EEPROM emulation) | 8 KB |
| Supply Voltage | 2.7 V to 5.5 V |
| Operating Temperature | -40C to +105C |
| Package | 48-TQFP (7x7 mm) |
| ADC | 12-bit, up to 1 Msps |
| DAC | 10-bit |
| Communication Peripherals | SERCOM x6 (UART/I2C/SPI), CAN-FD |
| Touch Peripheral | Peripheral Touch Controller (PTC) |
| Hardware Multiplier | Single-cycle |
| Memory Protection Unit | Yes |
| Trace | Micro Trace Buffer |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
ATSAMC21G18A-ANT Pin Configuration
| Pin 1 | PA00 — GPIO/SERCOM/I2C |
| Pin 2 | PA01 — GPIO/SERCOM/I2C |
| Pin 3 | PA02 — GPIO/ADC AIN0 |
| Pin 4 | PA03 — GPIO/ADC AIN1/DAC VOUT |
| Pin 5 | GND — Ground |
| Pin 6 | VDD — Digital supply voltage |
| Pin 7 | PA04 — GPIO/SERCOM/I2C |
| Pin 8 | PA05 — GPIO/SERCOM/I2C |
| Pin 9 | PA06 — GPIO/SERCOM/I2C |
| Pin 10 | PA07 — GPIO/SERCOM/I2C |
| Pin 11 | PA08 — GPIO/SERCOM/I2C |
| Pin 12 | PA09 — GPIO/SERCOM/I2C |
| Pin 13 | PA10 — GPIO/SERCOM/I2C |
| Pin 14 | PA11 — GPIO/SERCOM/I2C |
| Pin 15 | VDDIO — I/O supply voltage |
| Pin 16 | GND — Ground |
| Pin 17 | PB10 — GPIO/SERCOM/I2C |
| Pin 18 | PB11 — GPIO/SERCOM/I2C |
| Pin 19 | PA12 — GPIO/SERCOM/I2C |
| Pin 20 | PA13 — GPIO/SERCOM/I2C |
| Pin 21 | PA14 — GPIO/SERCOM/I2C |
| Pin 22 | PA15 — GPIO/SERCOM/I2C |
| Pin 23 | PA16 — GPIO/SERCOM/I2C |
| Pin 24 | PA17 — GPIO/SERCOM/I2C |
| Pin 25 | PA18 — GPIO/SERCOM/I2C |
| Pin 26 | PA19 — GPIO/SERCOM/I2C |
| Pin 27 | VDD — Digital supply voltage |
| Pin 28 | GND — Ground |
| Pin 29 | PA20 — GPIO/SERCOM/I2C |
| Pin 30 | PA21 — GPIO/SERCOM/I2C |
| Pin 31 | PA22 — GPIO/SERCOM/I2C |
| Pin 32 | PA23 — GPIO/SERCOM/I2C |
| Pin 33 | PA24 — GPIO/SERCOM/I2C |
| Pin 34 | PA25 — GPIO/SERCOM/I2C |
| Pin 35 | PB22 — GPIO/CAN0 TX |
| Pin 36 | PB23 — GPIO/CAN0 RX |
| Pin 37 | PA26 — GPIO |
| Pin 38 | PA27 — GPIO |
| Pin 39 | PA28 — GPIO |
| Pin 40 | PA29 — GPIO |
| Pin 41 | PA30 — GPIO/SWCLK |
| Pin 42 | PA31 — GPIO/SWDIO |
| Pin 43 | RESET — Reset input (active low) |
| Pin 44 | VDD — Digital supply voltage |
| Pin 45 | GND — Ground |
| Pin 46 | VBAT — Battery backup supply |
| Pin 47 | XIN32 — 32.768 kHz crystal input |
| Pin 48 | XOUT32 — 32.768 kHz crystal output |
Typical Applications
ATSAMC21G18A-ANT is suitable for 6 applications: Industrial Human-Machine Interface (HMI) Panels, BLDC and PMSM Motor Control, Automotive Body and Lighting ECUs, Building Automation and Smart Sensors, Industrial CAN-FD Sensor Nodes, Capacitive Touch Control Interfaces.
Industrial Human-Machine Interface (HMI) Panels
The ATSAMC21G18A-ANT fits industrial HMI panels because its integrated Peripheral Touch Controller (PTC) supports capacitive buttons, sliders, and wheels without an external touch IC, while the 12-bit 1 Msps ADC digitizes analog front-panel sensors. The 5 V-tolerant I/O ring drives legacy 5 V LED indicators and LCD segments directly. The six SERCOM peripherals handle I2C sensor hubs, SPI displays, and UART-to-RS485 bridges simultaneously, and CAN-FD links the panel to the factory network for real-time status reporting.
Recommended
BLDC and PMSM Motor Control
The ATSAMC21G18A-ANT is well suited to BLDC and PMSM motor control thanks to its 16-bit PWM timer with complementary outputs and dead-band generation, plus a 12-bit 1 Msps ADC capable of sampling back-EMF at 20 kHz PWM rates. The Cortex-M0+ core's deterministic interrupt latency enables field-oriented control (FOC) loops at switching frequencies up to 30 kHz. CAN-FD provides feedback to the master controller and simplifies firmware updates across motor clusters.
Recommended
Automotive Body and Lighting ECUs
The ATSAMC21G18A-ANT is a strong fit for automotive body and lighting ECUs because its 5 V-tolerant I/O interfaces directly with body-control peripherals like seat motors and lighting LEDs without external level translation. CAN-FD enables high-bandwidth communication with the vehicle backbone, and the AEC-Q100-capable process technology supports 105C operation. The 256 KB Flash accommodates LIN/CAN stacks plus application firmware, and the PTC enables capacitive touch surfaces on door handles and dashboards.
Recommended
Building Automation and Smart Sensors
The ATSAMC21G18A-ANT is ideal for building-automation sensors (HVAC, occupancy, air-quality) because its 5 V tolerance lets it share a 24 V-bus rail with legacy thermostats, and the low-power sleep modes extend battery life in wireless nodes. The six SERCOM peripherals aggregate I2C sensor hubs, SPI radios, and UART modems. CAN-FD or RS-485 interfaces connect the node to the building management system for centralized data collection.
Recommended
Industrial CAN-FD Sensor Nodes
The ATSAMC21G18A-ANT fits CAN-FD sensor nodes because the on-chip CAN-FD controller supports up to 8 Mbps payload rates, ideal for high-resolution vibration or torque data. The 12-bit ADC pairs with external signal conditioning to digitize strain-gauge or thermocouple inputs, and the 5 V I/O ring directly drives industrial 24 V proximity sensors after a simple resistive divider. The 256 KB Flash holds CANopen or J1939 stacks plus application firmware.
Recommended
Capacitive Touch Control Interfaces
The ATSAMC21G18A-ANT excels at capacitive touch interfaces because its integrated Peripheral Touch Controller (PTC) supports up to 256 mutual-capacitance channels with hardware-accelerated scanning, eliminating the need for an external touch IC. The 5 V-tolerant I/O ring drives segment LCDs or LED indicators directly. The Cortex-M0+ core runs Microchip's QTouch library for sliders, wheels, and proximity sensing at low power, and CAN-FD connects the touch panel to a master controller.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMC21G18A-ANT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMC21G17A-AUT | ATSAMC21G16A-AUT | ATSAMC20G18A-ANT | ATSAMC21G18A-AUT | ATSAMC20N18A-ANT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-TQFP (7x7 mm) | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same |
| Core Architecture | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Maximum Clock Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash Memory | 256 KB | 128 KB | 128 KB | 256 KB | 256 KB | 256 KB |
| SRAM | 32 KB | 32 KB | 16 KB | 32 KB | 32 KB | 32 KB |
| CAN-FD Controller | Yes | No | No | No | Yes | No |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Touch Controller (PTC) | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- 5 V-tolerant I/O ring with CAN-FD in Cortex-M0+ class (vs ATSAMC20G18A-ANT)
- Highest Flash density in SAM C21 48-TQFP family (vs ATSAMC21G17A-AUT)
- Industrial temperature grade -40C to +105C (vs ATSAMC21E18A-MUT)
Design Notes
Place a 100 nF ceramic decoupling capacitor within 3 mm of every VDD pin and a single 4.7 µF bulk capacitor near the package. The 5 V-tolerant I/O ring allows direct connection to industrial 24 V pre-regulated rails, but if the rail is unregulated, add a series resistor plus TVS diode to limit inrush. Connect VBAT to VDD if battery backup is not used, and tie RESET high via a 10 kΩ pull-up with a 1 nF cap to ground for debouncing.
Estimated: At 48 MHz operation with all peripherals active, the ATSAMC21G18A-ANT consumes approximately 14 mA from 3.3 V (roughly 46 mW). In a 48-TQFP (7x7 mm) package with theta_JA near 70 C/W on a 2-layer JEDEC EIA/JESD51 board, this yields a junction temperature rise of about 3 C above ambient, well within the 105 C rating. For hot-environment industrial designs above 85 C ambient, ensure continuous convection or attach the exposed thermal pad to a copper pour for better dissipation.
Route the 32.768 kHz crystal traces to XIN32/XOUT32 with short, symmetric traces and guard the area with a ground pour to minimize capacitive coupling. CAN0 TX/RX traces (PB22/PB23) should be impedance-matched to 120 Ω and terminated at both ends of the bus per ISO 11898-1. Keep SERCOM signals away from the PWM outputs to avoid crosstalk, and provide a solid ground plane under the TQFP body for return current paths.
Do not leave unused pins floating - configure them as outputs or enable internal pull-ups to avoid excess current draw. The CAN-FD controller requires a certified transceiver such as the MCP2562FD for ISO 11898-1 compliance; connecting CAN_TX/CAN_RX directly to a bus without a transceiver will damage the MCU. Avoid using the SWD pins PA30/PA31 as GPIO in production firmware unless you have a debug-out strategy; locking out the SWD interface is a common field-return cause.
Compliance Information
RoHS and REACH compliant per Microchip product page. AEC-Q100 grade is not qualified for this specific -ANT part number; the -AUT automotive grade variant may be required for full AEC-Q100 compliance.
