ATSAMC20N18A-ANT - 256KB Flash Cortex-M0+ MCU 48MHz | Microchip
MPN: ATSAMC20N18A-ANT β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.65 | $2,325.00 |
| 1,000 | $4.1 | $4,100.00 |
ATSAMC20N18A-ANT Overview
A microcontroller (MCU) is an integrated circuit that combines a CPU core, program memory (Flash), working memory (SRAM), and a rich set of peripherals (timers, ADC, communication controllers, GPIO) onto a single chip. Within the broader semiconductor taxonomy, an MCU belongs to the integrated circuits > microcontrollers category and serves as the programmable brain of an embedded system, replacing discrete logic and reducing BOM cost and board area. The SAM C20 family specifically targets 5V-tolerant industrial and consumer applications requiring deterministic real-time control.
Key features include a single-cycle hardware multiplier, a Micro Trace Buffer for instruction tracing, a Memory Protection Unit (MPU) for safe firmware partitioning, an 8 KB independent self-programmable Flash region for EEPROM emulation, and up to 84 GPIO. The device supports a wide 2.7V to 5.5V supply range, making it ideal for industrial 24V-bus-derived rails and legacy 5V system upgrades. Integrated peripherals include a 12-bit ADC, multiple SERCOM (configurable USART/SPI/I2C) channels, a 16-bit Timer/Counter, and a Real-Time Clock.
Architecturally, the Cortex-M0+ core delivers an energy-efficient Thumb-2 instruction set with deterministic interrupt latency, while the 5V-tolerant I/O pads remove the need for external level shifters. The 100-TQFP package offers ample pinout for full peripheral expansion and simplifies hand-prototyping and optical inspection during rework.
Typical applications include industrial automation controllers, building automation sensors, HVAC controls, smart energy metering, white goods motor control, and human-machine interface (HMI) panels. The 5V tolerance and CAN-FD capable SERCOM make it a strong fit for factory floor nodes communicating with sensors and actuators.
When designing with the ATSAMC20N18A-ANT, place a 100 nF decoupling capacitor on each VDD pin as close to the IC as practical, and route the VDDCORE LDO output through a 1 uF bulk capacitor. Use the SAM C20 software framework in Atmel/Microchip Studio to take advantage of the verified peripheral drivers and reduce firmware development time.
This page synthesizes distributor pricing, parametric drop-in alternatives from the same SAM C20 family, and practical design notes not aggregated in a single datasheet view, helping engineers rapidly evaluate the part for 5V-tolerant embedded control designs.
Drop-in alternatives for ATSAMC20N18A-ANT β 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 ATSAMC20N18A-ANT (same form factor and footprint) β differing in Core, Package, RoHS Status, Flash Memory, Operating Temperature.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATSAMC20G18A-ANT
β Drop-Inβ In Stock
$2.34 / Unit
View Datasheet βATSAMC20N17A-ANT
β Drop-Inπ Reference alternative (not in catalog)
ATSAMC20N16A-ANT
β Drop-Inπ Reference alternative (not in catalog)
ATSAMC21N18A-ANT
β Drop-Inβ In Stock
$4.12 / Unit
View Datasheet βATSAMC20E18A-ANT
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATSAMC20N18A-ANT Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M0+ (32-bit) |
| Maximum CPU Clock | 48 MHz |
| Program Flash Memory | 256 KB (256K x 8) |
| SRAM | 32 KB |
| EEPROM Emulation Region (separate Flash) | 8 KB |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Operating Temperature Range | -40 C to +105 C |
| GPIO Count | 84 |
| Package | 100-pin TQFP (14x14 mm) |
| Mounting Type | Surface Mount |
| I/O Tolerance | 5V tolerant |
| Hardware Multiplier | Single-cycle 32-bit |
| Memory Protection Unit (MPU) | Yes |
| Micro Trace Buffer | Yes |
| ADC | 12-bit |
| Communication Interfaces | SERCOM (configurable USART/SPI/I2C) |
| Packing Media | Tape and Reel (1000) |
| RoHS Status | Compliant (Green, lead-free) |
ATSAMC20N18A-ANT 100-pin tqfp (14x14 mm) Pin Configuration Guide
Pin configuration for ATSAMC20N18A-ANT (100-pin tqfp (14x14 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATSAMC20N18A-ANT.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAMC20N18A-ANT is suitable for 7 applications: Industrial Automation Controllers, Building Automation and HVAC Control, Smart Energy Metering, White Goods Motor Control, Human-Machine Interface (HMI) Panels, Sensor Hubs and Data Aggregators, Automotive Body and Comfort Modules.
Industrial Automation Controllers
The ATSAMC20N18A-ANT fits industrial automation controllers through its 5V-tolerant I/O and 2.7V-5.5V supply range, allowing direct interface to 24V-bus-derived 5V rails without external level shifters. The 84 GPIO and six SERCOM channels provide ample connectivity for digital sensors, actuators, and RS-485 transceivers common in PLCs and distributed I/O modules. The Cortex-M0+ core at 48 MHz delivers deterministic interrupt response for time-critical control loops, while the 256 KB Flash accommodates Modbus, CANopen, or EtherCAT slave stacks with room for application firmware.
Recommended
Building Automation and HVAC Control
Building automation systems benefit from the ATSAMC20N18A-ANT's wide operating temperature range (-40C to +105C) for installation in unconditioned equipment rooms and rooftop units. The 32 KB SRAM supports BACnet or Modbus TCP/IP stacks while the 256 KB Flash stores application firmware, schedules, and configuration data. The 12-bit ADC directly interfaces with thermistor, humidity, and pressure sensors, while SERCOM channels drive I2C temperature compensation ICs and SPI displays for local HMI feedback.
Recommended
Smart Energy Metering
Smart energy meters leverage the ATSAMC20N18A-ANT's 256 KB Flash for metering algorithm firmware, calibration tables, and tamper-detection logic. The Cortex-M0+ core executes real-time RMS and power-factor calculations on AC line-current waveforms sampled by the 12-bit ADC at rates up to 1 Msps. The integrated MPU isolates metering firmware from communication stacks (Modbus, DLMS/COSEM), supporting security and regulatory requirements for revenue-grade metering in IEC 62053-22 applications.
Recommended
White Goods Motor Control
Washing machines, dishwashers, and refrigerator compressors use the ATSAMC20N18A-ANT as the main controller, with the Cortex-M0+ handling user-interface I/O and supervisory logic while delegating real-time motor control to a companion dsPIC or dedicated motor driver. The 84 GPIO and six SERCOM channels manage user-panel keypads, LED/LCD displays, motor-driver enable lines, and sensor feedback. The 5V tolerance interfaces directly to 5V motor-driver logic without level translation, simplifying PCB design and reducing BOM cost.
Recommended
Human-Machine Interface (HMI) Panels
Industrial HMI panels leverage the ATSAMC20N18A-ANT's 84 GPIO to drive character or graphic LCDs, scan keypads, and interface with capacitive touch controllers. The 256 KB Flash stores menu structures, multilingual strings, and graphics bitmaps, while 32 KB SRAM supports runtime rendering buffers. The Cortex-M0+ at 48 MHz provides enough throughput for moderately animated UIs. For higher-resolution TFT panels, the SERCOM SPI channels run at up to 24 MHz, enabling fast display refresh.
Recommended
Sensor Hubs and Data Aggregators
The ATSAMC20N18A-ANT acts as a sensor hub aggregating data from multiple I2C/SPI sensors (temperature, humidity, pressure, IMU) and forwarding it to a host controller via UART or SPI. The six SERCOM channels allow simultaneous connection to up to six sensors on independent buses, eliminating bus contention. The 32 KB SRAM buffers burst sensor reads before forwarding, while the 256 KB Flash stores sensor calibration data and protocol translation logic (e.g., I2C-to-Modbus bridging).
Recommended
Automotive Body and Comfort Modules
While not AEC-Q100 qualified, the ATSAMC20N18A-ANT can be deployed in non-safety automotive body and comfort applications such as interior lighting controllers, seat-control modules, and rear-seat entertainment head units. The wide 2.7V-5.5V supply tolerates 12V-bus transients after external regulation. For AEC-Q100 Grade-1 qualified variants in the same footprint, the automotive-grade ATSAMC20N18A-AUT part number is required, providing -40C to +125C operation and PPAP documentation.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMC20N18A-ANT β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMC20G18A-ANT | ATSAMC20N17A-ANT | ATSAMC20N16A-ANT | ATSAMC21N18A-ANT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 100-TQFP (14x14) | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same |
| Core | Cortex-M0+ | Cortex-M0+ | Cortex-M0+ | Cortex-M0+ | Cortex-M0+ with FPU |
| Max CPU Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash | 256 KB | 256 KB | 128 KB | 64 KB | 256 KB |
| SRAM | 32 KB | 32 KB | 16 KB | 8 KB | 32 KB |
| GPIO Count | 84 | 84 | 84 | 84 | 84 |
| Supply Voltage | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V |
| CAN-FD Controller | No | No | No | No | Yes |
| Operating Temperature | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C |
Key Differentiators
- Highest Flash density (256KB) in the 100-TQFP SAM C20 family (vs ATSAMC20N17A-ANT)
- 5V-tolerant I/O without external level shifters (vs ATSAMC21N18A-ANT)
- Industrial -40C to +105C temperature grade as standard (vs ATSAMC20G18A-ANT)
Design Notes
Place a 100 nF ceramic decoupling capacitor on each VDD and VDDCORE pin as close to the IC as practical (within 2 mm). Add a shared 4.7 uF bulk capacitor on the main VDD rail near the MCU. The internal 1.2V LDO requires an external 1 uF ceramic on the VDDCORE pin; do not omit this capacitor or the core may exhibit unstable behavior or fail to start. Estimated: the MCU's typical active current at 48 MHz is approximately 7 mA per the SAM C20 datasheet, so total rail current at full peripheral usage remains below 30 mA.
The 100-TQFP package has 0.5 mm pitch leads requiring careful PCB layout. Use a 4-layer PCB with a dedicated ground plane beneath the MCU for thermal dissipation and signal integrity. Keep trace lengths on SWDIO, SWCLK, and NRST under 50 mm to avoid programming/debugging failures. Route the ADC analog signals (e.g., AIN0-AIN15) away from switching digital lines such as PWM outputs to minimize coupling noise into ADC readings.
Do not confuse the 100-TQFP ATSAMC20N18A-ANT with the smaller 32-pin SAM C20E family (ATSAMC20E18A-AUT) or 48-pin QFN SAM C20G variants - although they share the SAM C20 family, they are NOT pin-compatible drop-in replacements; substituting across packages requires a PCB redesign. Also ensure the GCLK_FREQUENCY is configured correctly before increasing the CPU clock to 48 MHz; an invalid GCLK source will cause the CPU to stall at reset. When migrating to the ATSAMC21N18A-ANT for CAN-FD, verify that the SERCOM CAN mode configuration matches the new peripheral map.
Compliance Information
Green/lead-free per Microchip product page (microchipdirect.com). Not AEC-Q100 qualified - choose ATSAMC20N18A-AUT suffix for automotive Grade-1 qualified variants.
