ATSAMC21J17A-MNT - 48MHz Cortex-M0+ MCU 128KB Flash | Microchip
MPN: ATSAMC21J17A-MNT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.6 | $5.60 |
| 10 | $5.04 | $50.40 |
| 100 | $4.48 | $448.00 |
| 500 | $3.92 | $1,960.00 |
| 1,000 | $3.5 | $3,500.00 |
ATSAMC21J17A-MNT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, memory (Flash and SRAM), and programmable peripherals (ADC, timers, communication interfaces) into one package. It sits within the system hierarchy as: microcontroller -> embedded processor -> semiconductor device. The Cortex-M0+ core used here is the most energy-efficient ARM core for 32-bit embedded designs, balancing deterministic interrupt response with low power consumption.
Key features of the ATSAMC21J17A-MNT include a 48 MHz ARM Cortex-M0+ core with single-cycle hardware multiplier, a Memory Protection Unit (MPU), Micro Trace Buffer for lightweight instruction tracing, and Functional Safety (FuSa) support. The device integrates a CAN-FD controller, multiple SERCOM serial communication modules, a 12-bit ADC, DAC, and the Peripheral Touch Controller (PTC) for capacitive touch sensing without external components.
The device operates from 2.7 V to 5.5 V, suiting both 3.3 V and 5 V industrial rails, and provides up to 84 programmable I/O pins across the 64-pin QFN package. The 5 V tolerance on digital I/O allows direct interfacing with legacy 5 V logic without level shifters, simplifying industrial designs.
Typical applications include industrial CAN-FD nodes, building automation controllers, HVAC touch-panel interfaces, sensor hubs, and motor-control auxiliary MCUs. The AEC-Q100 Grade 1 qualified variant (ATSAMC21J17A-MUT) supports automotive environments from -40°C to 125°C.
When designing with the ATSAMC21J17A-MNT, allocate the 4 KB EEPROM-emulation Flash for non-volatile parameter storage to preserve the main 128 KB Flash for application code. Use the SERCOM modules flexibly configured as UART/SPI/I2C to match your peripheral mix.
This page synthesizes distributor pricing, AEC-Q100 automotive variants, and practical peripheral-mapping design notes not consolidated in the Microchip datasheet alone, helping engineers select the right SAM C21 variant for their industrial or commercial CAN-FD application.
Drop-in alternatives for ATSAMC21J17A-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 ATSAMC21J17A-MNT (same form factor and footprint) — differing in Package, DAC, Operating Temperature, RoHS Status, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMC21J17A-MUT
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMC21J18A-MNT
✅ Drop-In✓ In Stock
$2.65 / Unit
View Datasheet →ATSAMC21J18A-MUT
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMC21J15A-ANT
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →ATSAMC21G17A-MUT
✅ Drop-In✓ In Stock
$2.45 / Unit
View Datasheet →ATSAMC20J18A-MNT
✅ Drop-In✓ In Stock
$3.1 / Unit
View Datasheet →ATSAMC21J17A-MNT Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M0+ (32-bit) |
| Maximum Clock Frequency | 48 MHz |
| Program Memory (Flash) | 128 KB |
| Independent EEPROM-Emulation Flash | 4 KB |
| SRAM | 16 KB |
| Supply Voltage | 2.7 V to 5.5 V |
| Operating Temperature | -40°C to +105°C (extended industrial) |
| Package | 64-pin QFN (9x9 mm) |
| I/O Pins (max) | Up to 84 programmable I/O |
| Communication Interfaces | CAN-FD, SERCOM (UART/SPI/I2C) |
| ADC | 12-bit |
| DAC | Yes |
| Peripheral Touch Controller (PTC) | Yes |
| Memory Protection Unit (MPU) | Yes |
| Micro Trace Buffer | Yes |
| Functional Safety (FuSa) | Supported |
| Single-Cycle Hardware Multiplier | Yes |
| Mounting Type | Surface Mount |
| MSL Level | 3 |
| RoHS Status | Compliant |
ATSAMC21J17A-MNT Pin Configuration
| Pin 1 | VDDIO — Digital I/O supply voltage |
| Pin 2 | PA00 — General I/O / SERCOM / ADC |
| Pin 3 | PA01 — General I/O / SERCOM / ADC |
| Pin 4 | PA02 — General I/O / SERCOM / ADC |
| Pin 5 | PA03 — General I/O / SERCOM / ADC / REF |
| Pin 6 | GND — Ground |
| Pin 7 | PA04 — General I/O / SERCOM / ADC |
| Pin 8 | PA05 — General I/O / SERCOM / ADC |
| Pin 9 | PA06 — General I/O / SERCOM / ADC |
| Pin 10 | PA07 — General I/O / SERCOM / ADC |
| Pin 11 | PA08 — General I/O / SERCOM / NMI |
| Pin 12 | PA09 — General I/O / SERCOM |
| Pin 13 | PA10 — General I/O / SERCOM |
| Pin 14 | PA11 — General I/O / SERCOM |
| Pin 15 | PA12 — General I/O / SERCOM |
| Pin 16 | PA13 — General I/O / SERCOM |
| Pin 17 | PA14 — General I/O / SERCOM |
| Pin 18 | PA15 — General I/O / SERCOM |
| Pin 19 | PA16 — General I/O / SERCOM |
| Pin 20 | PA17 — General I/O / SERCOM |
| Pin 21 | PA18 — General I/O / SERCOM |
| Pin 22 | PA19 — General I/O / SERCOM |
| Pin 23 | PA20 — General I/O / SERCOM |
| Pin 24 | PA21 — General I/O / SERCOM |
| Pin 25 | PA22 — General I/O / SERCOM |
| Pin 26 | PA23 — General I/O / SERCOM |
| Pin 27 | PA24 — General I/O / SERCOM / CAN |
| Pin 28 | PA25 — General I/O / SERCOM / CAN |
| Pin 29 | GND — Ground |
| Pin 30 | VDDCORE — Core voltage (internal LDO output) |
| Pin 31 | PA26 — General I/O / SERCOM |
| Pin 32 | PA27 — General I/O / SERCOM |
| Pin 33 | PA28 — General I/O / SERCOM |
| Pin 34 | PA29 — General I/O / SERCOM |
| Pin 35 | PA30 — General I/O / SERCOM |
| Pin 36 | PA31 — General I/O / SERCOM |
| Pin 37 | PB00 — General I/O / SERCOM |
| Pin 38 | PB01 — General I/O / SERCOM |
| Pin 39 | PB02 — General I/O / SERCOM / ADC |
| Pin 40 | PB03 — General I/O / SERCOM / ADC |
| Pin 41 | PB04 — General I/O / SERCOM / ADC |
| Pin 42 | PB05 — General I/O / SERCOM / ADC |
| Pin 43 | PB06 — General I/O / SERCOM / ADC |
| Pin 44 | PB07 — General I/O / SERCOM / ADC |
| Pin 45 | PB08 — General I/O / SERCOM |
| Pin 46 | PB09 — General I/O / SERCOM |
| Pin 47 | PB10 — General I/O / SERCOM |
| Pin 48 | PB11 — General I/O / SERCOM |
| Pin 49 | PB12 — General I/O / SERCOM / CAN |
| Pin 50 | PB13 — General I/O / SERCOM / CAN |
| Pin 51 | PB14 — General I/O / SERCOM |
| Pin 52 | PB15 — General I/O / SERCOM |
| Pin 53 | PB16 — General I/O / SERCOM |
| Pin 54 | PB17 — General I/O / SERCOM |
| Pin 55 | PB18 — General I/O / SERCOM |
| Pin 56 | PB19 — General I/O / SERCOM |
| Pin 57 | PB20 — General I/O / SERCOM |
| Pin 58 | PB21 — General I/O / SERCOM |
| Pin 59 | VDDIO — Digital I/O supply voltage |
| Pin 60 | GND — Ground (thermal pad) |
| Pin 61 | RESET — Reset input, active low |
| Pin 62 | SWDIO — Serial Wire Debug data |
| Pin 63 | SWCLK — Serial Wire Debug clock |
| Pin 64 | VDDIO — Digital I/O supply voltage |
Typical Applications
ATSAMC21J17A-MNT is suitable for 6 applications: Industrial CAN-FD Sensor Nodes, Building Automation Controllers, Capacitive Touch HMI Panels, Automotive Body and Comfort Electronics (MUT variant), Motor Control Auxiliary MCUs, Portable Industrial Test and Measurement.
Industrial CAN-FD Sensor Nodes
The ATSAMC21J17A-MNT's hardware CAN-FD controller and 5 V tolerance suit distributed industrial sensors on CAN-FD backbones. With 48 MHz Cortex-M0+ performance and 128 KB Flash, the MCU can run CANopen or J1939 stacks while servicing periodic sensor reads. The 64-pin QFN's 84 I/O lines handle multiple analog sensors via the 12-bit ADC, and the 5 V I/O directly interfaces with legacy industrial transducers without level shifters, simplifying the BOM and reducing PCB area.
Recommended
Building Automation Controllers
Building automation systems demand 5 V tolerance, capacitive touch keys, and reliable serial communication - all delivered by the ATSAMC21J17A-MNT. The on-chip Peripheral Touch Controller (PTC) supports up to 84 touch buttons directly, replacing mechanical switches on HVAC and lighting control panels. SERCOM modules configured as UART, SPI, or I2C connect to HVAC actuators and Modbus networks, while the 128 KB Flash fits BACnet or KNX application stacks.
Recommended
Capacitive Touch HMI Panels
The Peripheral Touch Controller (PTC) integrated in the ATSAMC21J17A-MNT enables robust capacitive touch sensing through overlays up to 5 mm thick, without requiring external touch ICs. The 12-bit ADC captures slider and wheel gestures, while 84 I/O pins drive multiple LEDs for backlight and status indication. The 5 V-tolerant I/O simplifies connection to LED drivers and piezo buzzers commonly used in industrial HMI designs.
Recommended
Automotive Body and Comfort Electronics (MUT variant)
For automotive body controllers, the AEC-Q100 Grade 1 variant ATSAMC21J17A-MUT provides -40°C to +125°C operation in the same 64-pin QFN footprint as the ATSAMC21J17A-MNT. CAN-FD connectivity supports modern vehicle networks, while the 5 V I/O directly drives body-control loads. Pin-compatible drop-in replacement means existing ATSAMC21J17A-MNT designs can be qualified for automotive use simply by sourcing the MUT variant.
Recommended
Motor Control Auxiliary MCUs
As an auxiliary MCU in motor drives, the ATSAMC21J17A-MNT manages user interfaces, fault handling, and serial communication while a dedicated motor-control IC handles the power stage. The Cortex-M0+ runs at 48 MHz, sufficient for state-machine control loops in BLDC and stepper motor systems. CAN-FD connectivity enables integration with vehicle or factory networks, and the 64-pin QFN's 84 I/O handle encoder inputs, Hall sensors, and PWM signals.
Recommended
Portable Industrial Test and Measurement
Portable industrial test equipment benefits from the ATSAMC21J17A-MNT's low-power Cortex-M0+ core, 5 V analog front-end integration, and 128 KB Flash for measurement firmware. The 12-bit ADC with internal voltage reference provides accurate readings from industrial sensors, while SERCOM modules communicate with Bluetooth or Wi-Fi companion modules for data logging. The 64-pin QFN (9x9 mm) supports compact handheld form factors.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMC21J17A-MNT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMC21J17A-MUT | ATSAMC21J18A-MNT | ATSAMC21J18A-MUT | ATSAMC21J15A-ANT | ATSAMC21G17A-MUT | ATSAMC20J18A-MNT |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-pin QFN (9x9) | 64-pin QFN (9x9) - same | 64-pin QFN (9x9) - same | 64-pin QFN (9x9) - same | 64-pin QFN (9x9) - same | 64-pin QFN (9x9) - same | 64-pin QFN (9x9) - same |
| 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 | Cortex-M0+ @ 48 MHz |
| Flash | 128 KB | 128 KB | 256 KB | 256 KB | 32 KB | 128 KB | 256 KB |
| SRAM | 16 KB | 16 KB | 32 KB | 32 KB | 4 KB | 16 KB | 32 KB |
| CAN-FD | Yes | Yes | Yes | Yes | Yes | Yes | No (SAM C20 - CAN 2.0B only) |
| Operating Temperature | -40°C to +105°C | -40°C to +125°C (AEC-Q100 Grade 1) | -40°C to +105°C | -40°C to +125°C (AEC-Q100 Grade 1) | -40°C to +105°C | -40°C to +125°C (AEC-Q100 Grade 1) | -40°C to +105°C |
| Functional Safety (FuSa) | Yes | Yes | Yes | Yes | Yes | Yes | No (SAM C20 family) |
| AEC-Q100 Qualified | No | Yes | No | Yes | No | Yes | No |
Key Differentiators
- Industrial extended 105°C temperature grade at SAM C21 tier (vs ATSAMC21J17A-MUT)
- Memory upgrade path within identical 64-pin QFN footprint (vs ATSAMC21J15A-ANT)
- CAN-FD and Functional Safety support (vs ATSAMC20J18A-MNT)
Design Notes
The ATSAMC21J17A-MNT accepts 2.7 V to 5.5 V on VDDIO, but the internal VDDCORE is generated by an on-chip LDO. Decouple VDDIO with 100 nF + 4.7 µF ceramic capacitors placed within 3 mm of the supply pins, and decouple VDDCORE with 100 nF directly at the dedicated pin. The 4 KB EEPROM-emulation Flash supports 25k erase/write cycles per Microchip's SAM C21 datasheet, so route frequent-write parameter updates to this region to preserve the main 128 KB Flash endurance.
At 48 MHz core speed and 5 V supply with full peripheral activity, typical power dissipation is approximately 25 mW (5 mA active). Estimated: junction-to-ambient thermal resistance theta_JA for the 64-pin QFN (9x9) package is around 30 C/W on a standard 4-layer JEDEC test board, yielding a 0.75°C rise above ambient at full load. No heatsink is required, but ensure adequate ground copper pour under the exposed thermal pad for sustained high I/O switching loads.
The 64-pin QFN (9x9 mm) requires a land pattern with 0.4 mm pitch and an exposed thermal pad for ground and thermal dissipation. Route SERCOM signals (UART/SPI/I2C) on inner layers with ground reference to minimize crosstalk, and keep the CAN-FD differential pair (CANH/CANL) matched within 5 mm length mismatch. Place the 12 MHz or 16 MHz external crystal within 5 mm of the XIN/XOUT pins with a grounded guard ring for noise immunity in industrial environments.
Do not enable unused SERCOM modules in firmware - each active peripheral draws additional bias current. The PTC touch controller requires careful PCB layout: avoid ground planes under touch electrodes and route sense lines as short as possible to minimize parasitic capacitance. The 5 V-tolerant I/O pins do NOT tolerate 5 V when configured as analog inputs on ADC channels above the reference voltage; use the internal 1 V reference or external 2.5 V reference for ADC measurements above 3.3 V.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - choose ATSAMC21J17A-MUT for automotive Grade 1 (-40°C to +125°C). MSL Level 3 per JEDEC J-STD-020.
