ATSAMD20J15A-AN - 32KB Flash Cortex-M0+ MCU 48MHz | Microchip
MPN: ATSAMD20J15A-AN ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.45 | $3.45 |
| 10 | $3.1 | $31.00 |
| 100 | $2.78 | $278.00 |
| 500 | $2.45 | $1,225.00 |
| 1,000 | $2.15 | $2,150.00 |
ATSAMD20J15A-AN Overview
A microcontroller (MCU) is an integrated circuit that combines a processor core, program and data memory, peripherals, and I/O on a single silicon die, enabling embedded control without external logic. The Cortex-M0+ is ARM's smallest and most energy-efficient 32-bit core, designed for deterministic real-time workloads at very low active and sleep currents; the ATSAMD20J15A-AN positions itself in the broad hierarchy: ARM Cortex-M0+ -> 32-bit MCU -> microcontroller -> semiconductor device.
Key features include a 2.14 CoreMark/MHz performance figure, brown-out detect and reset, power-on reset, a windowed watchdog timer, and a peripheral event system that lets on-chip peripherals trigger one another without CPU intervention. The device also integrates a full-speed USB 2.0 device controller on selected SAM D20 SKUs, though the SAM D20J 64-pin family routes those pins to GPIO.
Architecturally, the ATSAMD20J15A-AN uses a single-cycle 32-bit bus matrix with separate code and SRAM regions, a low-power 32 kHz RTC domain, and SERCOM (Serial Communication Interface) modules that can be software-configured as USART, I2C, or SPI, giving the designer maximum pin flexibility. The 48 MHz core is paired with a low-jitter oscillator chain and a power-on-reset block that simplifies external component count.
Typical applications include home automation endpoints, low-power consumer devices, smart metering, and industrial sensor nodes where deterministic Cortex-M0+ performance is needed without the cost of higher-end Cortex-M4 parts. The wide 1.62V-3.63V supply window also allows direct battery connection from a single Li-ion cell.
When designing with this device, prefer Atmel Studio / Microchip Studio with the ASF or Harmony 3 framework, and respect the 64-pin TQFP exposed-pad land pattern for adequate thermal dissipation, as the die dissipates more heat than smaller QFN-package SAM D20 variants.
This page synthesizes distributor pricing, drop-in alternates within the same 64-pin TQFP footprint, and practical design notes beyond what the manufacturer datasheet alone provides.
Drop-in alternatives for ATSAMD20J15A-AN — 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 ATSAMD20J15A-AN (same form factor and footprint) — differing in Package, SRAM, ADC, Core Architecture, MSL Level.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMD20J16A-MU
✅ Drop-In✓ In Stock
$2.45 / Unit
View Datasheet →ATSAMD20J18A-MU
✅ Drop-In✓ In Stock
$2.69 / Unit
View Datasheet →ATSAMD20J14A-CNT
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →ATSAMD20G18A-MU
✅ Drop-In✓ In Stock
$3.51 / Unit
View Datasheet →ATSAMD20E18A-MU
✅ Drop-In✓ In Stock
$2.75 / Unit
View Datasheet →ATSAMD20J15A-AN Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M0+ |
| Core Size | 32-bit |
| Maximum CPU Clock | 48 MHz |
| CoreMark / MHz | 2.14 |
| Program Memory (Flash) | 32 KB (32K x 8) |
| SRAM | 4 KB |
| Supply Voltage (VDD) | 1.62 V to 3.63 V |
| Operating Temperature | -40 C to +105 C |
| Number of I/O | 52 |
| Connectivity | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, WDT, Peripheral Event System |
| Package | 64-TQFP (10x10 mm) with exposed pad |
| Mounting Type | Surface Mount |
| Series | SAM D20J |
| MSL Level | 3 (168 hours) |
| Peak Reflow Temperature | 260 C |
| RoHS Status | Compliant |
ATSAMD20J15A-AN Pin Configuration
| Pin 1 | PA00 — General-purpose I/O / SERCOM1 pad 0 |
| Pin 2 | PA01 — General-purpose I/O / SERCOM1 pad 1 |
| Pin 3 | PA02 — General-purpose I/O / analog input |
| Pin 4 | PA03 — General-purpose I/O / analog input / reference |
| Pin 5 | VDD — Digital supply voltage |
| Pin 6 | GND — Ground |
| Pin 7 | PA04 — General-purpose I/O / SERCOM0 pad 0 |
| Pin 8 | PA05 — General-purpose I/O / SERCOM0 pad 1 |
| Pin 9 | PA06 — General-purpose I/O / SERCOM0 pad 2 |
| Pin 10 | PA07 — General-purpose I/O / SERCOM0 pad 3 |
| Pin 11 | PA08 — General-purpose I/O / SERCOM2 pad 0 |
| Pin 12 | PA09 — General-purpose I/O / SERCOM2 pad 1 |
| Pin 13 | PA10 — General-purpose I/O / SERCOM2 pad 2 |
| Pin 14 | PA11 — General-purpose I/O / SERCOM2 pad 3 |
| Pin 15 | VDD — Digital supply voltage |
| Pin 16 | GND — Ground |
| Pin 17 | PA12 — General-purpose I/O / SERCOM4 pad 0 |
| Pin 18 | PA13 — General-purpose I/O / SERCOM4 pad 1 |
| Pin 19 | PA14 — General-purpose I/O / SERCOM4 pad 2 |
| Pin 20 | PA15 — General-purpose I/O / SERCOM4 pad 3 |
| Pin 21 | PA16 — General-purpose I/O / SERCOM1 pad 0 |
| Pin 22 | PA17 — General-purpose I/O / SERCOM1 pad 1 |
| Pin 23 | PA18 — General-purpose I/O / SERCOM1 pad 2 |
| Pin 24 | PA19 — General-purpose I/O / SERCOM1 pad 3 |
| Pin 25 | VDD — Digital supply voltage |
| Pin 26 | GND — Ground |
| Pin 27 | PA20 — General-purpose I/O / SERCOM5 pad 0 |
| Pin 28 | PA21 — General-purpose I/O / SERCOM5 pad 1 |
| Pin 29 | PA22 — General-purpose I/O / SERCOM5 pad 2 |
| Pin 30 | PA23 — General-purpose I/O / SERCOM5 pad 3 |
| Pin 31 | PA24 — General-purpose I/O / SERCOM3 pad 0 |
| Pin 32 | PA25 — General-purpose I/O / SERCOM3 pad 1 |
| Pin 33 | PA26 — General-purpose I/O |
| Pin 34 | PA27 — General-purpose I/O |
| Pin 35 | PA28 — General-purpose I/O |
| Pin 36 | PA29 — General-purpose I/O |
| Pin 37 | PA30 — General-purpose I/O / SWCLK (debug) |
| Pin 38 | PA31 — General-purpose I/O / SWDIO (debug) |
| Pin 39 | PB00 — General-purpose I/O |
| Pin 40 | PB01 — General-purpose I/O |
| Pin 41 | PB02 — General-purpose I/O / analog input |
| Pin 42 | PB03 — General-purpose I/O / analog input |
| Pin 43 | PB04 — General-purpose I/O |
| Pin 44 | PB05 — General-purpose I/O |
| Pin 45 | PB06 — General-purpose I/O |
| Pin 46 | PB07 — General-purpose I/O |
| Pin 47 | PB08 — General-purpose I/O |
| Pin 48 | PB09 — General-purpose I/O |
| Pin 49 | PB10 — General-purpose I/O |
| Pin 50 | PB11 — General-purpose I/O |
| Pin 51 | PB12 — General-purpose I/O / external interrupt |
| Pin 52 | PB13 — General-purpose I/O / external interrupt |
| Pin 53 | PB14 — General-purpose I/O / external interrupt |
| Pin 54 | PB15 — General-purpose I/O / external interrupt |
| Pin 55 | PB16 — General-purpose I/O / SERCOM5 pad 0 |
| Pin 56 | PB17 — General-purpose I/O / SERCOM5 pad 1 |
| Pin 57 | VDD — Digital supply voltage |
| Pin 58 | GND — Ground |
| Pin 59 | VDDCORE — Internal core voltage decoupling |
| Pin 60 | GND — Ground |
| Pin 61 | XIN — External crystal oscillator input |
| Pin 62 | XOUT — External crystal oscillator output |
| Pin 63 | RESET — Active-low reset input |
| Pin 64 | GND — Ground (exposed pad) |
Typical Applications
ATSAMD20J15A-AN is suitable for 6 applications: Home Automation Endpoints, Smart Metering Nodes, Industrial Sensor Hubs, Low-Power Wearable Devices, Consumer Appliance Control Boards, Battery-Operated IoT Sensor Nodes.
Home Automation Endpoints
The ATSAMD20J15A-AN fits home automation endpoint designs through its combination of 32KB Flash, 4KB SRAM, and 52 GPIO that comfortably drive sensor arrays, pushbuttons, and triac-controlled loads. The 1.62V-3.63V supply range accepts single-cell Li-ion or 2x AA alkaline packs without boost regulators, while the 2.14 CoreMark/MHz performance handles Zigbee/Thread stack preprocessing and BLE beaconing. Compared with 8-bit PIC alternatives in the same price band, the Cortex-M0+ gives a 4x code-density advantage.
Recommended
Smart Metering Nodes
For electricity, water, or gas metering the ATSAMD20J15A-AN delivers deterministic Cortex-M0+ performance to run metering algorithms, LCD drivers, and tamper-detection logic from a single IC. The peripheral event system routes ADC conversions directly to timers without CPU wake-up, preserving battery life - a key requirement for sealed metering units. The 32KB Flash stores calibration tables and rolling consumption logs; 4KB SRAM supports meter-protocol stacks like DLMS/COSEM.
Recommended
Industrial Sensor Hubs
Industrial sensor hubs benefit from the ATSAMD20J15A-AN's 52 GPIO, six SERCOM modules configurable as I2C/SPI/UART, and industrial -40C to +105C operating range. It can aggregate data from temperature, pressure, and flow sensors and forward it over RS-485 or CAN bridges. The 48MHz clock rate keeps ADC oversampling latencies below 1ms, and the brown-out detector plus windowed watchdog satisfy IEC 61131-2 industrial PLC guidelines for embedded controllers.
Recommended
Low-Power Wearable Devices
Wearable designs leverage the ATSAMD20J15A-AN's low-power SleepWalking peripherals and 32kHz RTC domain, which can wake the Cortex-M0+ core only on relevant sensor events. Drawing less than 10uA/MHz in active mode, it supports multi-day battery life on a small Li-Po cell. The 64-TQFP exposed pad aids heat spreading under continuous BLE advertisement loads. 32KB Flash is sufficient for sensor-fusion firmware and over-the-air update bootloaders.
Recommended
Consumer Appliance Control Boards
In consumer appliances (coffee machines, robotic vacuums, dishwashers) the ATSAMD20J15A-AN drives brushless DC motors via PWM, reads user interfaces through capacitive touch or matrix keypads, and controls displays. Its 1.62V-3.63V input lets designers reuse the same board across 3.3V and 5V rails with level shifters. The 32KB Flash accommodates USB HID stacks (where USB-capable SAM D20 SKUs are used) and product-variation firmware images.
Recommended
Battery-Operated IoT Sensor Nodes
Battery-powered IoT sensor nodes rely on the ATSAMD20J15A-AN's sub-microamp sleep modes and event-driven peripherals to extend operating life on a coin cell. The peripheral event system can chain ADC, DMA, and SERCOM transactions without CPU intervention, allowing years of battery life on duty-cycled applications. The wide 1.62V-3.63V supply window supports direct connection from primary lithium or rechargeable Li-ion chemistries, simplifying power-tree design.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD20J15A-AN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD20J16A-MU | ATSAMD20J18A-MU | ATSAMD20J14A-CNT | ATSAMD20G18A-MU | ATSAMD20E18A-MU |
|---|---|---|---|---|---|---|
| Package | 64-TQFP (10x10 mm) | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Maximum Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash | 32 KB | 64 KB | 256 KB | 16 KB | 256 KB | 256 KB |
| SRAM | 4 KB | 8 KB | 32 KB | 2 KB | 32 KB | 32 KB |
| Supply Voltage | 1.62V to 3.63V | 1.62V to 3.63V | 1.62V to 3.63V | 1.62V to 3.63V | 1.62V to 3.63V | 1.62V to 3.63V |
| GPIO Count | 52 | 52 | 52 | 52 | 38 | 26 |
| Operating Temperature | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C |
Key Differentiators
- Pin-compatible Flash upgrades within same SAM D20J family (vs ATSAMD20J16A-MU / ATSAMD20J18A-MU)
- Lowest-cost 32KB Flash option in SAM D20J family (vs ATSAMD20J16A-MU)
- Industrial-grade operating range across full -40C to +105C window (vs ATSAMD20J15A-AU)
- ARM Cortex-M0+ vs 8-bit PIC16F alternative (vs PIC16F684-I/SL (same Site MPN list))
Design Notes
The ATSAMD20J15A-AN requires a single 1.62V-3.63V supply on VDD; the internal voltage regulator generates the core domain. Decouple VDD with a 100nF ceramic capacitor placed within 3mm of the pin, plus a bulk 4.7uF tantalum or ceramic capacitor. The VDDCORE pin (pin 59) requires a 1uF decoupling cap to GND. Estimated: under typical 48MHz active operation, the device draws approximately 7mA from VDD, well within standard LDO ratings.
The 64-TQFP (10x10 mm) exposed pad is the primary thermal path to the PCB. Solder the exposed pad directly to a copper pour of at least 1 square inch to keep theta_JA below 40 C/W. Estimated: at 48MHz active load with all peripherals enabled, junction temperature rise above ambient is approximately 10C with proper copper area, leaving substantial margin to the 105C industrial-grade ceiling. Do not rely on the exposed pad being electrically isolated; verify against the SAM D20 family datasheet.
Route the SWD signals (SWDIO on PA31, SWCLK on PA30) as a matched-length pair with ground return path; keep total trace length under 50mm to avoid debugger communication failures. Place the 32.768kHz crystal within 5mm of XIN/XOUT with a guarded ground keepout zone. Use a 4-layer stackup with continuous ground plane under the MCU to minimize EMI; the high-frequency 48MHz clock traces should be short and surrounded by ground stitching vias.
Common pitfalls: (1) Forgetting to enable the peripheral event system in the PMC before chaining ADC-to-DMA transfers. (2) Configuring SERCOM pads without first selecting the alternate peripheral function in PORT, which results in silent pin idle. (3) Exceeding 3.63V absolute-maximum on any GPIO during hot-plug events; add external TVS protection if the design touches user-accessible connectors. (4) Omitting the decoupling capacitor on VDDCORE causes brown-out reset under sudden load steps.
Keep high-speed SERCOM signals (SPI at >10MHz, I2C Fast Mode Plus at 1MHz) away from analog inputs to avoid digital crosstalk into ADC readings. The SAM D20 ADC has a typical ENOB of 10.5 at 1Msps; preserve that performance by isolating analog ground returns and using a star-ground topology at the MCU GND pin. Route the RESET line away from switching power inductors to avoid false resets during load transients.
Compliance Information
RoHS and REACH compliant per Microchip product environmental compliance documentation. Not AEC-Q100 qualified; for AEC-Q100 Grade 1 automotive applications, use ATSAMD20J15A-ANR or equivalent automotive-grade SAM D20 variant. Lead-free matte-tin finish confirmed by 'N' suffix in ordering code.
