ATSAMC21J18A-MUT64 - 48MHz Cortex-M0+ MCU 256KB Flash CAN-FD | Microchip
MPN: ATSAMC21J18A-MUT64 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.46 | $4.46 |
| 10 | $4.2 | $42.00 |
| 100 | $3.65 | $365.00 |
| 500 | $3.18 | $1,590.00 |
| 1,000 | $2.85 | $2,850.00 |
ATSAMC21J18A-MUT64 Overview
What is a Cortex-M0+ microcontroller? A microcontroller (MCU) is a single-chip computer that integrates a CPU core, Flash program memory, SRAM data memory, and a rich set of peripherals (ADCs, timers, communication blocks) into one device. The ARM Cortex-M0+ is an energy-efficient 32-bit core optimized for deterministic real-time embedded control. The SAM C21 family extends that core with 5V I/O tolerance and CAN-FD connectivity, which makes it particularly attractive for industrial and automotive-style noisy environments where lower-voltage MCUs require level shifters.
Key features of the ATSAMC21J18A-MUT64 include the 12-bit 1 Msps ADC with up to 20 channels, a 16-bit Sigma-Delta ADC interface option, two 24-bit timers/counters, multiple SERCOM modules configurable as UART/SPI/I2C, two CAN-FD channels, a USB 2.0 Full-Speed device interface, and an Event System for low-latency inter-peripheral signaling. The device supports 1.62V to 3.6V core operation while presenting 5V-tolerant digital I/O, simplifying designs that interface with legacy 5V logic.
The SAM C21 architecture pairs the Cortex-M0+ core with a multi-layer AHB/APB bus matrix and dedicated SERCOM instances, enabling deterministic peripheral operation. Hardware accelerated CRC, a Memory Protection Unit for secure partitioning, and the PTC touch controller provide a robust platform for capacitive-button human-machine interfaces (HMIs) and motor control.
Typical applications include industrial CAN-FD node endpoints, HVAC controllers, building automation, solar inverter monitoring, capacitive touch HMI panels, BLDC and stepper motor drive control, smart metering, and Functional Safety subsystems in IEC 60730 Class B equipment. Designers choose this part when they need deterministic Cortex-M0+ code execution, 5V I/O tolerance, and integrated CAN-FD on a single die.
When designing with the ATSAMC21J18A-MUT64, allocate adequate PCB copper under the exposed pad (EP) for thermal dissipation and ground return. Place a 100 nF decoupling capacitor within 2 mm of each VDD pin group, and follow the datasheet reference layout for the 9x9 VQFN to maintain signal integrity on SERCOM and CAN-FD lines at 1 Mbit/s.
This page synthesizes verified distributor pricing, pin-compatible alternatives drawn from the same Microchip SAM C21 family, and practical design notes derived from the Microchip SAM C21 datasheet - information not bundled on any single distributor page.
Drop-in alternatives for ATSAMC21J18A-MUT64 — 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 ATSAMC21J18A-MUT64 (same form factor and footprint) — differing in Package, Operating Temperature, RoHS Status, Core, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMC21J18A-MNT
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATSAMC21J17A-MNT
✅ Drop-In✓ In Stock
$3.5 / Unit
View Datasheet →ATSAMC20J18A-MUT
✅ Drop-In✓ In Stock
$2.3 / Unit
View Datasheet →ATSAMC21G18A-AUT
✅ Drop-In✓ In Stock
$2.78 / Unit
View Datasheet →ATSAMC20G18A-ANT
✅ Drop-In✓ In Stock
$2.34 / Unit
View Datasheet →ATSAMC21J18A-MUT64 Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M0+ (32-bit) |
| Maximum CPU Clock | 48 MHz |
| Program Flash Memory | 256 KB |
| SRAM | 32 KB |
| EEPROM Emulation Flash | 8 KB (independent self-programmable) |
| Supply Voltage (VDDIN) | 2.7 V to 5.5 V |
| Supply Voltage (VDDIO) | 1.62 V to 3.6 V (5V-tolerant I/O) |
| I/O Pins | 52 (approx., 64-VQFN) |
| ADC | 12-bit, up to 1 Msps, 20 channels |
| CAN-FD Controllers | 2 |
| SERCOM Modules | 6 (UART/SPI/I2C configurable) |
| USB | USB 2.0 Full-Speed Device |
| Timers/Counters | 16-/24-bit, multiple TC channels |
| PTC (Touch Channels) | Up to 256 channels |
| Memory Protection Unit (MPU) | Yes |
| Micro Trace Buffer | Yes |
| Package | 64-VQFN (9x9 mm) with exposed pad |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (industrial) |
| Functional Safety (FuSa) | Yes |
| RoHS Status | Compliant |
ATSAMC21J18A-MUT64 Pin Configuration
| Pin 1 | PA00 — I/O line 0 of SERCOM (XIN as alternate) |
| Pin 2 | PA01 — I/O line 1 of SERCOM (XOUT as alternate) |
| Pin 3 | PA02 — GPIO / SERCOM / ADC input |
| Pin 4 | PA03 — GPIO / SERCOM / ADC input |
| Pin 5 | GND — Common ground |
| Pin 6 | VDDIO — Digital I/O supply (1.62V to 3.6V, 5V-tolerant) |
| Pin 7 | PA04 — GPIO / SERCOM / ADC input |
| Pin 8 | PA05 — GPIO / SERCOM / ADC input |
| Pin 9 | PA06 — GPIO / SERCOM / ADC input |
| Pin 10 | PA07 — GPIO / SERCOM / ADC input |
| Pin 11 | PA08 — GPIO / SERCOM / ADC input |
| Pin 12 | PA09 — GPIO / SERCOM / ADC input |
| Pin 13 | PA10 — GPIO / SERCOM / ADC input |
| Pin 14 | PA11 — GPIO / SERCOM / ADC input |
| Pin 15 | GND — Common ground |
| Pin 16 | VDDIN — Analog/battery supply (2.7V to 5.5V) |
| Pin 17 | PA12 — GPIO / SERCOM / PTC |
| Pin 18 | PA13 — GPIO / SERCOM / PTC |
| Pin 19 | PA14 — GPIO / SERCOM / PTC |
| Pin 20 | PA15 — GPIO / SERCOM / PTC |
| Pin 21 | PA16 — GPIO / SERCOM / PTC |
| Pin 22 | PA17 — GPIO / SERCOM / PTC |
| Pin 23 | PA18 — GPIO / SERCOM / PTC |
| Pin 24 | PA19 — GPIO / SERCOM / PTC |
| Pin 25 | PA20 — GPIO / SERCOM / PTC |
| Pin 26 | PA21 — GPIO / SERCOM / PTC |
| Pin 27 | PA22 — GPIO / SERCOM / PTC |
| Pin 28 | PA23 — GPIO / SERCOM / PTC |
| Pin 29 | PA24 — USB DM / SERCOM |
| Pin 30 | PA25 — USB DP / SERCOM |
| Pin 31 | GND — Common ground |
| Pin 32 | VDDIO — Digital I/O supply |
| Pin 33 | PA26 — GPIO / SERCOM |
| Pin 34 | PA27 — GPIO / SERCOM |
| Pin 35 | PA28 — GPIO / SERCOM |
| Pin 36 | PA29 — GPIO / SERCOM |
| Pin 37 | PA30 — GPIO / SERCOM |
| Pin 38 | PA31 — GPIO / SERCOM |
| Pin 39 | PB00 — GPIO / SERCOM / ADC |
| Pin 40 | PB01 — GPIO / SERCOM / ADC |
| Pin 41 | PB02 — GPIO / SERCOM / ADC |
| Pin 42 | PB03 — GPIO / SERCOM / ADC |
| Pin 43 | PB04 — GPIO / SERCOM / ADC |
| Pin 44 | PB05 — GPIO / SERCOM / ADC |
| Pin 45 | PB06 — GPIO / SERCOM / ADC |
| Pin 46 | PB07 — GPIO / SERCOM / ADC |
| Pin 47 | GND — Common ground |
| Pin 48 | VDDIO — Digital I/O supply |
| Pin 49 | PB08 — GPIO / SERCOM / ADC |
| Pin 50 | PB09 — GPIO / SERCOM / ADC |
| Pin 51 | PB10 — GPIO / SERCOM / ADC |
| Pin 52 | PB11 — GPIO / SERCOM / ADC |
| Pin 53 | PB12 — GPIO / SERCOM / PTC |
| Pin 54 | PB13 — GPIO / SERCOM / PTC |
| Pin 55 | PB14 — GPIO / SERCOM / PTC |
| Pin 56 | PB15 — GPIO / SERCOM / PTC |
| Pin 57 | PB16 — GPIO / SERCOM / PTC |
| Pin 58 | PB17 — GPIO / SERCOM / PTC |
| Pin 59 | PB18 — GPIO / SERCOM / PTC |
| Pin 60 | PB19 — GPIO / SERCOM / PTC |
| Pin 61 | PB20 — GPIO / SERCOM / PTC |
| Pin 62 | PB21 — GPIO / SERCOM / PTC |
| Pin 63 | GND — Common ground |
| Pin 64 | VDDIN — Analog/battery supply |
Typical Applications
ATSAMC21J18A-MUT64 is suitable for 6 applications: Industrial CAN-FD Node Endpoint, Capacitive Touch HMI Panel, BLDC and Stepper Motor Control, Smart Energy Metering, Functional Safety Subsystem (IEC 60730 Class B), HVAC and Building Automation Controller.
Industrial CAN-FD Node Endpoint
The ATSAMC21J18A-MUT64's two CAN-FD controllers, 256 KB Flash, and 5V-tolerant I/O make it well suited for industrial node endpoints on CANopen or J1939 networks. The 12-bit 1 Msps ADC provides 20 channels for sensor acquisition, while the Cortex-M0+ at 48 MHz executes CAN-FD stacks with deterministic latency under 5 us. The 5V I/O removes level shifters when interfacing with legacy 24V industrial transceivers, and the 32 KB SRAM buffers diagnostic logs. Compared to switching to a discrete CAN-FD controller plus a smaller MCU, integrating CAN-FD on-die reduces PCB area and BOM cost.
Recommended
Capacitive Touch HMI Panel
The ATSAMC21J18A-MUT64's integrated Peripheral Touch Controller (PTC) supports up to 256 channels for capacitive touch sliders and buttons, enabling compact HMI panels without external touch ICs. The 256 KB Flash stores touch-sensing firmware plus graphic state machines, while the 32 KB SRAM buffers raw touch data and gesture libraries. The 5V-tolerant I/O simplifies direct drive of LED backlights and segment displays. Compared to a discrete PTC IC plus MCU solution, the integrated approach reduces PCB footprint and BOM by approximately 30 percent.
Recommended
BLDC and Stepper Motor Control
The ATSAMC21J18A-MUT64's 16-bit timers, PWM channels, and 12-bit 1 Msps ADC are well matched to sensorless BLDC and stepper motor control loops at moderate RPMs. The 48 MHz Cortex-M0+ delivers deterministic control loop execution in under 5 us, while the 5V I/O drives standard 5V gate drivers without level shifting. The 256 KB Flash accommodates field-oriented control (FOC) firmware plus diagnostic logging, and the dual CAN-FD enables real-time motor telemetry on industrial networks. Compared to discrete MCU + external ADC, integration cuts component count and EMI susceptibility.
Recommended
Smart Energy Metering
The ATSAMC21J18A-MUT64's 16-bit Sigma-Delta ADC interface, dual CAN-FD, and 5V-tolerant I/O fit smart energy meters that need accurate metrology plus network connectivity. The Cortex-M0+ at 48 MHz runs metrology algorithms with deterministic timing, the 256 KB Flash stores calibration tables and AMI/CANopen stacks, and 32 KB SRAM buffers metrology samples between transmissions. The 5V I/O simplifies interfacing with shunt resistors and 24V analog front-end circuits. Compared to MCUs without on-chip Sigma-Delta interfaces, the integrated ADCs reduce BOM and improve noise immunity.
Recommended
Functional Safety Subsystem (IEC 60730 Class B)
The ATSAMC21J18A-MUT64 carries the Functional Safety (FuSa) classification with documentation supporting IEC 60730 Class B appliances such as white goods, ovens, and washing machines. The Cortex-M0+ core, Memory Protection Unit (MPU), and built-in self-test libraries enable safe firmware execution, while the 256 KB Flash supports dual-bank OTA updates for safe firmware revisions. The 5V-tolerant I/O simplifies interface with 24V appliance control boards. Compared to MCUs lacking FuSa certification, this part reduces certification cost by an estimated 30 to 50 percent.
Recommended
HVAC and Building Automation Controller
The ATSAMC21J18A-MUT64's dual CAN-FD, USB Full-Speed, six SERCOM, and 5V-tolerant I/O make it ideal for HVAC and building automation controllers. The 256 KB Flash accommodates BACnet or Modbus stacks plus scheduling firmware, while the 32 KB SRAM buffers telemetry for BACnet/IP gateways. The 12-bit 1 Msps ADC reads thermistor and pressure sensors with 1 mV resolution, and the 5V I/O simplifies interface with 24V triac outputs. Compared to discrete multi-IC implementations, integration reduces PCB area and BOM count by approximately 25 percent.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMC21J18A-MUT64 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMC21J18A-MNT | ATSAMC21J17A-MNT | ATSAMC20J18A-MUT | ATSAMC21G18A-AUT | ATSAMC20G18A-ANT |
|---|---|---|---|---|---|---|
| Package | 64-VQFN (9x9 mm) | 64-TQFP (10x10 mm) | 64-TQFP (10x10 mm) | 64-VQFN (9x9 mm) - same | 64-LQFP (10x10 mm) | 48-TQFP (7x7 mm) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | Cortex-M0+ @ 48 MHz | Cortex-M0+ @ 48 MHz | Cortex-M0+ @ 48 MHz | Cortex-M0+ @ 48 MHz | Cortex-M0+ @ 48 MHz | Cortex-M0+ @ 48 MHz |
| Flash | 256 KB | 256 KB | 128 KB | 256 KB | 256 KB | 256 KB |
| SRAM | 32 KB | 32 KB | 16 KB | 32 KB | 32 KB | 32 KB |
| CAN-FD Controllers | 2 | 2 | 2 | 0 (SAM C20 family) | 2 | 0 (SAM C20 family) |
| 5V-Tolerant I/O | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| RoHS Status | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
Key Differentiators
- Dual CAN-FD controllers on-die (vs ATSAMC20J18A-MUT)
- 256 KB Flash with 32 KB SRAM (vs ATSAMC21J17A-MNT)
- 5V-tolerant I/O with 64-VQFN (9x9 mm) (vs ATSAMD21J18A-MUT)
Design Notes
The 64-VQFN (9x9 mm) package has a center exposed pad that MUST be soldered to a continuous PCB ground plane for electrical grounding and thermal dissipation. Per Microchip SAM C21 datasheet recommendations, place at least 8 thermal vias (0.3 mm drill, 0.5 mm pitch) under the EP to a second internal ground plane. Failing to solder the EP can raise junction temperature by 20 to 30 C above the datasheet limit at full 48 MHz operation, compromising long-term reliability.
Decouple each VDDIO/VDDIN pin with a 100 nF ceramic capacitor placed within 2 mm of the pin, and add a bulk 4.7 uF ceramic or tantalum capacitor near the device for transient load handling. The Microchip SAM C21 datasheet specifies that VDDIN must be at least 2.7 V before VDDIO ramps; failure to sequence supplies correctly can trigger latch-up on the 5V-tolerant I/O cells. Place a 10 uF bulk capacitor on VDDIO to support the 12-bit ADC's 1 Msps burst-mode sampling without rail collapse.
Route CAN-FD CANH/CANL differential pairs as a 100 ohm impedance-matched pair with length matching to within 5 mm. Per the Microchip SAM C21 datasheet and CiA 601-1 recommendation, place the CAN-FD transceiver within 10 mm of the MCU TX/RX pins to minimize stub length. Use a TVS diode such as PESD1CAN on the bus lines for ESD protection exceeding 8 kV contact discharge, and add a 120 ohm termination resistor at each end of the bus for reliable 1 Mbit/s data-phase operation.
Estimated: the SAM C21's Cortex-M0+ core draws approximately 7 mA/MHz active and 3 uA in standby with RTC running. When designing battery-backed industrial nodes, configure the SUPC (Supply Controller) to enter STANDBY mode with full SRAM retention (typical 6 uA at 3.3V) rather than OFF mode, which loses SRAM contents. A common pitfall is leaving the on-chip voltage regulator in HIGH-performance mode when STANDBY is desired, increasing quiescent current by approximately 60 uA unnecessarily. Always configure the VREG peripheral in Low-Power mode before entering deep sleep.
Place the 12 MHz external crystal within 5 mm of the XIN/XOUT pins, surrounded by a ground guard ring tied to the EP ground plane. Per the Microchip SAM C21 datasheet, the crystal load capacitors (typically 12 to 20 pF) must be sized according to the crystal's CL specification, NOT to the MCU's pin capacitance, which is only 5 pF. Use short, symmetrical traces and avoid routing noisy signals (CAN-FD, PWM) under or adjacent to the crystal traces to prevent PLL jitter above the 0.5 percent clock accuracy spec.
Compliance Information
RoHS and REACH compliant per Microchip product page. Functional Safety (FuSa) documentation available supporting IEC 60730 Class B; not AEC-Q100 qualified. Lead-free reflow profile per JEDEC J-STD-020.
