ATSAMC20J18A-MNT - 256KB Flash SAM C20 Cortex-M0+ MCU | Microchip
MPN: ATSAMC20J18A-MNT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.1 | $5.10 |
| 10 | $4.62 | $46.20 |
| 100 | $4.05 | $405.00 |
| 500 | $3.55 | $1,775.00 |
| 1,000 | $3.1 | $3,100.00 |
ATSAMC20J18A-MNT Overview
Key features include 256KB (256K x 8) Flash memory, 32KB SRAM, 48MHz maximum CPU frequency, and 52 programmable I/O pins across 6 SERCOM channels configurable as UART/SPI/I2C. The device supports 5V supply and signal levels, simplifying interfacing with legacy industrial sensors and actuators. It also incorporates a full-speed USB 2.0 device interface (SAM C20 family feature), 6-channel 12-bit ADC with up to 1 MSPS, dual analog comparators, and a 16-bit timer/counter array.
The SAM C20 architecture pairs a Cortex-M0+ core (ARMv6-M, Thumb-2 instruction set) with single-cycle multiplier and a Nested Vector Interrupt Controller (NVIC). The Microchip/Atmel SAM platform supports a Harvard bus architecture with separate code and data buses, deterministic interrupt latency, and low-power sleep modes with RTC retention. Advanced analog integration eliminates external op-amps in many sensor-conditioning paths.
Typical applications include industrial CAN-FD nodes, building automation controllers, automotive body and accessory ECUs, USB Human Interface Devices, sensor hubs, capacitive touch user interfaces, and low-power IoT edge nodes. The 5V tolerance and CAN-FD support specifically suit industrial fieldbus and automotive communication requirements.
When designing with this device, validate that the 64-pin QFN land pattern matches the target PCB footprint, observe thermal dissipation limits under sustained CPU load (active mode ~9 mA at 48MHz), and ensure decoupling capacitor placement follows the recommended 100nF+1uF+10uF network near the VDDCORE and VDDIO pins.
Drop-in alternatives for ATSAMC20J18A-MNT — 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 ATSAMC20J18A-MNT (same form factor and footprint) — differing in Package, Operating Temperature, ADC, RoHS Status, SRAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMC21J18A-MNT
✅ Drop-In✓ In Stock
$2.65 / Unit
View Datasheet →ATSAMC20J17A-MNT
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMC20J16A-MUT
✅ Drop-In✓ In Stock
$2.25 / Unit
View Datasheet →ATSAMC20E18A-MUT
✅ Drop-In✓ In Stock
$1.92 / Unit
View Datasheet →ATSAMD20J18A-MNT
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMC20G18A-ANT
✅ Drop-In✓ In Stock
$2.34 / Unit
View Datasheet →ATSAMC20J18A-MNT Maximum Ratings & Electrical Characteristics
| Series | SAM C20 |
| Core | ARM Cortex-M0+ |
| Core Architecture | ARMv6-M (32-bit) |
| Maximum CPU Frequency | 48 MHz |
| Program Memory Size | 256 KB (256K x 8) Flash |
| RAM Size | 32 KB SRAM |
| Supply Voltage (VDDIN) | 2.7 V to 5.5 V |
| Operating Temperature | -40 C to +105 C (Industrial, M-grade) |
| I/O Pins | 52 programmable I/O |
| Communication Interfaces | CAN-FD, USB 2.0 FS, 6x SERCOM (UART/SPI/I2C), I2S |
| ADC | 12-bit, up to 1 MSPS |
| DAC | 10-bit |
| Package | 64-pin QFN (VQFN) 9x9 mm with exposed pad |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (Green, lead-free) |
| MSL Level | MSL3 |
| Peripheral Touch Controller | Yes (PTC, capacitive touch) |
| Data Sheet Publish Date | 2016-11-04 |
ATSAMC20J18A-MNT Pin Configuration
| Pin 1 | PA00 — GPIO / XIN32 (external 32kHz crystal input) |
| Pin 2 | PA01 — GPIO / XOUT32 (external 32kHz crystal output) |
| Pin 3 | PA02 — GPIO / AIN0 (ADC input) |
| Pin 4 | PA03 — GPIO / AIN1 / VREFA (ADC reference) |
| Pin 5 | GND — Ground |
| Pin 6 | VDDIO — I/O supply voltage |
| Pin 7 | PA04 — GPIO / AIN2 |
| Pin 8 | PA05 — GPIO / AIN3 |
| Pin 9 | PA06 — GPIO / AIN4 |
| Pin 10 | PA07 — GPIO / AIN5 |
| Pin 11 | PA08 — GPIO / AIN6 / SERCOM0 PAD0 |
| Pin 12 | PA09 — GPIO / AIN7 / SERCOM0 PAD1 |
| Pin 13 | PA10 — GPIO / AIN8 / SERCOM0 PAD2 |
| Pin 14 | PA11 — GPIO / AIN9 / SERCOM0 PAD3 |
| Pin 15 | PA12 — GPIO / SERCOM1 PAD0 |
| Pin 16 | PA13 — GPIO / SERCOM1 PAD1 |
| Pin 17 | PA14 — GPIO / SERCOM1 PAD2 |
| Pin 18 | PA15 — GPIO / SERCOM1 PAD3 |
| Pin 19 | PA16 — GPIO / SERCOM2 PAD0 |
| Pin 20 | PA17 — GPIO / SERCOM2 PAD1 |
| Pin 21 | PA18 — GPIO / SERCOM2 PAD2 |
| Pin 22 | PA19 — GPIO / SERCOM2 PAD3 |
| Pin 23 | PA20 — GPIO / SERCOM3 PAD0 |
| Pin 24 | PA21 — GPIO / SERCOM3 PAD1 |
| Pin 25 | PA22 — GPIO / SERCOM3 PAD2 |
| Pin 26 | PA23 — GPIO / SERCOM3 PAD3 |
| Pin 27 | PA24 — GPIO / USB_DM |
| Pin 28 | PA25 — GPIO / USB_DP |
| Pin 29 | GND — Ground |
| Pin 30 | VDDIO — I/O supply voltage |
| Pin 31 | PA27 — GPIO |
| Pin 32 | PA28 — GPIO / SERCOM4 PAD0 |
| Pin 33 | PA29 — GPIO / SERCOM4 PAD1 |
| Pin 34 | PA30 — GPIO / SERCOM4 PAD2 / TCC0 WO0 |
| Pin 35 | PA31 — GPIO / SERCOM4 PAD3 / TCC0 WO1 |
| Pin 36 | PB00 — GPIO / SERCOM5 PAD0 |
| Pin 37 | PB01 — GPIO / SERCOM5 PAD1 |
| Pin 38 | PB02 — GPIO / SERCOM5 PAD2 / ADC AIN14 |
| Pin 39 | PB03 — GPIO / SERCOM5 PAD3 / ADC AIN15 |
| Pin 40 | PB04 — GPIO / SERCOM5 PAD0 (alt) |
| Pin 41 | PB05 — GPIO / SERCOM5 PAD1 (alt) |
| Pin 42 | PB06 — GPIO / SERCOM4 PAD0 (alt) |
| Pin 43 | PB07 — GPIO / SERCOM4 PAD1 (alt) |
| Pin 44 | PB08 — GPIO / SERCOM4 PAD2 (alt) |
| Pin 45 | PB09 — GPIO / SERCOM4 PAD3 (alt) |
| Pin 46 | PB10 — GPIO |
| Pin 47 | PB11 — GPIO |
| Pin 48 | PB12 — GPIO / CAN RX |
| Pin 49 | PB13 — GPIO / CAN TX |
| Pin 50 | PB14 — GPIO |
| Pin 51 | PB15 — GPIO |
| Pin 52 | PB16 — GPIO |
| Pin 53 | PB17 — GPIO |
| Pin 54 | PB18 — GPIO |
| Pin 55 | PB19 — GPIO |
| Pin 56 | PB20 — GPIO |
| Pin 57 | PB21 — GPIO |
| Pin 58 | PB22 — GPIO |
| Pin 59 | PB23 — GPIO |
| Pin 60 | PB24 — GPIO |
| Pin 61 | PB25 — GPIO |
| Pin 62 | VDDIO — I/O supply voltage |
| Pin 63 | GND — Ground |
| Pin 64 | VDDCORE — Internal core supply (1.2V LDO output) |
Typical Applications
ATSAMC20J18A-MNT is suitable for 8 applications: Industrial CAN-FD Communication Nodes, Building Automation Controllers, Automotive Body and Accessory ECUs, USB Human Interface Devices, Capacitive Touch User Interfaces, Low-Power IoT Edge Sensor Hubs, Sensor Signal Conditioning and Acquisition, USB-Powered Industrial Data Loggers.
Industrial CAN-FD Communication Nodes
The ATSAMC20J18A-MNT integrates a hardware CAN-FD controller supporting both Classical CAN 2.0B and CAN Flexible Data-Rate frames at up to 5 Mbit/s, making it ideal for industrial fieldbus nodes such as CANopen, DeviceNet, and NMEA 2000 networks. Its 5V supply and I/O tolerance eliminates level-shifters between sensors and the MCU, while 256KB Flash fits full CANopen stack plus application logic. Place the MCU between 24V industrial sensor rails and field actuators; the on-chip CAN-FD transceivers can pair with external high-speed transceivers such as the MCP2562FD.
Recommended
Building Automation Controllers
Building automation systems require multiple wired interfaces (BACnet, Modbus, RS-485) and capacitive touch user interfaces. The ATSAMC20J18A-MNT's 6 SERCOM channels configure as UART/SPI/I2C plus the integrated Peripheral Touch Controller (PTC) for capacitive buttons and sliders make it well suited. The 52 I/O pins drive relays, triacs, and LED indicators directly. Operating from -40 C to +105 C industrial temperature range, it handles HVAC control panels, smart thermostats, and access control keypads in commercial environments.
Recommended
Automotive Body and Accessory ECUs
The ATSAMC20J18A-MNT's 5V supply tolerance and CAN-FD support suit automotive body control modules such as seat controllers, mirror adjusters, interior lighting, and door modules. Its Cortex-M0+ core runs at 48MHz with deterministic interrupt latency for sensor polling, while the 12-bit ADC reads automotive sensor signals. The 64-QFN package with exposed pad provides robust thermal performance. Pair with automotive CAN transceivers such as the MCP2562FD for body-domain networks at 500 kbit/s Classical CAN or 2 Mbit/s CAN-FD.
Recommended
USB Human Interface Devices
USB HID peripherals such as industrial keypads, barcode scanners, custom input devices, and laboratory instruments benefit from the ATSAMC20J18A-MNT's integrated USB 2.0 full-speed device controller plus 256KB Flash for HID stacks. The 32KB SRAM buffers HID reports comfortably, while the 12-bit ADC reads analog inputs like joystick potentiometers. Implementation in the Microchip ASF or MPLAB Harmony framework reduces firmware development time. Connect D+/D- lines through 27-ohm series resistors to a USB Type-B or Type-C receptacle with proper ESD protection.
Recommended
Capacitive Touch User Interfaces
The ATSAMC20J18A-MNT's integrated Peripheral Touch Controller (PTC) supports up to 256 touch channels through hardware-driven capacitance-to-digital conversion, enabling robust buttons, sliders, and wheels without external touch ICs. Combined with the 12-bit ADC for proximity sensing and the 6 SERCOM channels for display communication, the MCU drives touch-based appliance panels, smart locks, and consumer devices. The -40 C to +105 C industrial temperature range and 5V operation suit kitchen appliances and outdoor controls.
Recommended
Low-Power IoT Edge Sensor Hubs
For battery-powered or energy-harvesting IoT edge nodes, the ATSAMC20J18A-MNT offers multiple low-power sleep modes with RTC retention and a 12-bit ADC for sensor signal acquisition. Operating from 2.7V to 5.5V supply, it works with single-cell Li-Ion, 3.3V system, or 5V industrial rails. The 256KB Flash accommodates TLS client libraries and OTA bootloader. Active mode at 48MHz draws approximately 9 mA; standby current drops below 5 uA with RTC running, suitable for wireless sensor hubs using companion radios like ATSAMR21 or external LoRa modules.
Recommended
Sensor Signal Conditioning and Acquisition
The ATSAMC20J18A-MNT's 12-bit ADC up to 1 MSPS plus dual analog comparators and a 10-bit DAC enable integrated sensor signal conditioning for thermocouples, RTDs, strain gauges, and process-control analog signals. The SERCOM channels communicate with external SPI ADCs for higher-resolution measurements. The 256KB Flash implements calibration tables and linearization firmware. With 5V analog supply tolerance, it directly interfaces with 0-10V industrial sensors commonly found in process automation, eliminating external signal conditioning.
Recommended
USB-Powered Industrial Data Loggers
Portable data loggers powered through USB use the ATSAMC20J18A-MNT's integrated USB 2.0 device interface plus 256KB Flash for storing configuration and small data buffers. Larger logs stream over USB to a host PC. The 12-bit ADC reads voltage, current, temperature sensors for industrial process logging, while the 5V I/O tolerance handles transducer signals directly. The 64-QFN exposed pad simplifies thermal management for sustained operation in factory-floor environments where ambient temperatures can approach 105 C.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMC20J18A-MNT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMC21J18A-MNT | ATSAMC20J17A-MNT | ATSAMC20E18A-MUT | ATSAMD20J18A-MNT |
|---|---|---|---|---|---|
| Brand | 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 |
| CPU Core | ARM Cortex-M0+ | ARM Cortex-M0+ with FPU | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Max CPU Frequency | 48 MHz | 64 MHz (+33%) | 48 MHz | 48 MHz | 48 MHz |
| Flash Memory | 256 KB | 256 KB | 128 KB (-50%) | 256 KB | 256 KB |
| SRAM | 32 KB | 32 KB | 16 KB (-50%) | 32 KB | 32 KB |
| CAN-FD Support | Yes (hardware) | Yes (hardware) | Yes (hardware) | Yes (hardware) | No |
| USB Interface | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device |
| 5V I/O Tolerance | Yes | Yes | Yes | Yes | No (3.3V only) |
| Peripheral Touch Controller | Yes (PTC) | Yes (PTC) | Yes (PTC) | Yes (PTC) | Yes (PTC) |
Key Differentiators
- Integrated hardware CAN-FD controller (vs ATSAMD20J18A-MNT)
- 5V supply and I/O tolerance (vs ATSAMD20J18A-MNT)
- Same QFN-64 footprint with FPU upgrade option (vs ATSAMC21J18A-MNT)
Design Notes
The ATSAMC20J18A-MNT requires a careful power decoupling network per the SAM C20 datasheet: place a 100 nF ceramic capacitor on each VDDIO pin, a 1 uF ceramic on VDDCORE, and a 10 uF bulk capacitor on VDDIN. Estimated: with VDDIN at 5V and active mode ~9 mA at 48 MHz, total supply current is approximately 9 mA; at 3.3V it drops to ~6 mA. For USB applications, add a 4.7 uF capacitor on VBUS to support USB inrush currents.
The 64-QFN exposed pad (EP) is the primary thermal dissipation path and MUST be soldered to a continuous ground plane on the top or inner PCB layer. Estimated: theta_JA for the 9x9 mm QFN with EP on a 4-layer JEDEC test board is approximately 28 C/W; in a real 2-layer design with limited ground copper, theta_JA may rise to 50 C/W. At maximum active mode power of 50 mW, junction temperature rise stays well within -40 C to +105 C operation.
For USB signal integrity, route the D+ and D- traces as a 90-ohm differential pair with controlled impedance, matching lengths within 150 mil. Place the 27-ohm series resistors close to the MCU pins PA24/PA25. For CAN-FD, route CANH and CANL as a 120-ohm differential pair with termination resistor at the bus ends. Keep analog signals (ADC inputs, VREFA) away from high-speed digital and USB traces.
Do not exceed 5.5 V on VDDIN or any I/O pin - the 5V tolerance applies only when VDDIO is configured for 5V operation. For SAM D20 cross-migration: the D20 lacks CAN-FD and 5V tolerance; replacing C20 with D20 in a 5V design will damage the I/O cells. Always verify the firmware's NVIC interrupt priorities match the Cortex-M0+ 4-level priority scheme and use the appropriate CMSIS register definitions.
When using the 12-bit ADC at 1 MSPS, place an anti-aliasing RC filter (typically 1 kohm + 1 nF = 159 kHz cutoff) on each analog input. Use a stable low-noise reference source for VREFA (e.g., REF3025 or MCP1525) - any noise on VREFA directly couples into ADC readings. For capacitive touch via PTC, route touch traces with ground shielding and avoid running noisy digital traces adjacent to them.
Compliance Information
RoHS compliant and Green per Microchip ordering information. Lead-free and halogen-free per Microchip environmental declarations. Industrial temperature grade -40 C to +105 C; not AEC-Q100 qualified - choose ATSAMC20J18A-AUT variant for automotive applications.
