ATSAMD20J16B-AU - ARM Cortex-M0+ MCU 64KB Flash | Microchip
MPN: ATSAMD20J16B-AU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.04 | $3.04 |
| 10 | $2.82 | $28.20 |
| 100 | $2.55 | $255.00 |
| 500 | $2.3 | $1,150.00 |
| 1,000 | $2.05 | $2,050.00 |
| 1,500 | $1.92 | $2,880.00 |
ATSAMD20J16B-AU Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripherals and I/O into one package. The ARM Cortex-M0+ core places the ATSAMD20 family in the Cortex-M0+ family -> ARM Cortex-M family -> 32-bit RISC MCU -> embedded microcontroller -> semiconductor taxonomy, where it serves as the central control element in connected, sensor-driven or battery-powered products.
Key features include 64 KB Flash, 8 KB SRAM, 6 SERCOM (configurable as UART/SPI/I2C), 12-bit 350 ksps ADC with up to 20 channels, 10-bit 350 ksps DAC, 256-channel PTC for capacitive touch, 6-channel DMA, full-speed USB device (when available on the die), RTC with calendar mode, and operating voltage 1.6 V to 3.6 V. Industrial temperature grade (-40 C to +85 C) supports commercial and industrial deployments, and Sleep + Idle + Standby power modes plus a 6-channel Event System keep active power in the microamp range.
Architecturally the device pairs an ultra-low-power CMOS process with the Cortex-M0+ core (only 12 KB of code space for the entire Thumb-2 instruction set), a single-cycle hardware multiplier and a fast peripheral interconnect. The SERCOM blocks are pin-mapped so any function (UART, SPI, I2C, LIN master) can be assigned to almost any GPIO, which simplifies PCB routing and footprint reuse across variants. The 12-bit ADC and DAC share a 1 V internal bandgap reference and can be triggered by hardware events or timers for deterministic sampling.
Typical applications include home automation sensor nodes, smart metering endpoints, capacitive-touch human-machine interfaces, consumer appliances, low-cost Bluetooth/BLE control hosts, and industrial control modules. The wide 1.6 V to 3.6 V range allows direct connection to single-cell Li-ion (after regulation) or 2x AA batteries.
When designing with this MCU, plan decoupling: place 100 nF X7R capacitors on each VDD pin plus a bulk 4.7 uF on the regulator output. The SWD pins (SWDIO, SWDCLK) must be brought out to a 2x5 0.05-inch header for programming and on-board debug with Atmel Studio / MPLAB X and a J-Link, Atmel-ICE or Curiosity board.
This page combines distributor pricing, validated drop-in pin-compatible alternatives, and practical design notes that go beyond the manufacturer datasheet to help engineers shorten selection and bring-up time.
Drop-in alternatives for ATSAMD20J16B-AU — 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 ATSAMD20J16B-AU (same form factor and footprint) — differing in ADC, Package, Mounting Type, SRAM, DAC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMD20J16B-AUT
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMD20J16B-AU
✅ Drop-In✓ In Stock
$1.92 / Unit
View Datasheet →ATSAMD20J16B-MUT
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMD20J16A-AU
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMD20J16B-AN
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.85 / Unit
View Datasheet →ATSAMD20J15A-AUT
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →ATSAMD20J16B-AU Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M0+ (32-bit) |
| Maximum CPU Clock | 48 MHz |
| Program Flash | 64 KB |
| SRAM | 8 KB |
| Operating Voltage Range | 1.6 V to 3.6 V |
| Package | 64-pin TQFP (10x10x1 mm) |
| Temperature Grade | Industrial -40 C to +85 C |
| ADC | 12-bit, up to 350 ksps, up to 20 channels |
| DAC | 10-bit, 350 ksps, 1 channel |
| Peripheral Touch Controller (PTC) | 256-channel capacitive touch |
| SERCOM | 6 (each configurable as UART/SPI/I2C) |
| DMA Channels | 6 |
| RTC | Yes, 32 kHz with calendar mode |
| Event System | 6 channels |
| Debug Interface | SWD (2-wire) |
| Lead-Free / RoHS | Yes / Compliant (Green) |
| Mounting Type | Surface Mount (Gull-Wing) |
ATSAMD20J16B-AU Pin Configuration
| Pin 1 | PA00 — GPIO / XIN32 / SERCOM1 PAD0 |
| Pin 2 | PA01 — GPIO / XOUT32 / SERCOM1 PAD1 |
| Pin 3 | PA02 — GPIO / AIN0 / DAC VOUT |
| Pin 4 | PA03 — GPIO / AIN1 / VREFA |
| Pin 5 | PA04 — GPIO / AIN2 / SERCOM0 PAD0 |
| Pin 6 | PA05 — GPIO / AIN3 / SERCOM0 PAD1 |
| Pin 7 | PA06 — GPIO / AIN4 / SERCOM0 PAD2 |
| Pin 8 | PA07 — GPIO / AIN5 / SERCOM0 PAD3 |
| Pin 9 | VDD — Digital supply voltage |
| Pin 10 | VSS — Digital ground |
| Pin 11 | PA08 — GPIO / AIN6 / SERCOM2 PAD0 |
| Pin 12 | PA09 — GPIO / AIN7 / SERCOM2 PAD1 |
| Pin 13 | PA10 — GPIO / AIN8 / SERCOM2 PAD2 |
| Pin 14 | PA11 — GPIO / AIN9 / SERCOM2 PAD3 |
| Pin 15 | PA12 — GPIO / AIN10 / SERCOM3 PAD0 |
| Pin 16 | PA13 — GPIO / AIN11 / SERCOM3 PAD1 |
| Pin 17 | PA14 — GPIO / AIN12 / SERCOM3 PAD2 |
| Pin 18 | PA15 — GPIO / AIN13 / SERCOM3 PAD3 |
| Pin 19 | PA16 — GPIO / SERCOM1 PAD0 / TC1 |
| Pin 20 | PA17 — GPIO / SERCOM1 PAD1 / TC1 |
| Pin 21 | PA18 — GPIO / SERCOM1 PAD2 / TC1 |
| Pin 22 | PA19 — GPIO / SERCOM1 PAD3 / TC1 |
| Pin 23 | PA20 — GPIO / SERCOM5 PAD2 / TC2 |
| Pin 24 | PA21 — GPIO / SERCOM5 PAD3 / TC2 |
| Pin 25 | PA22 — GPIO / SERCOM3 PAD0 / TC2 |
| Pin 26 | PA23 — GPIO / SERCOM3 PAD1 / TC2 |
| Pin 27 | PA24 — GPIO / SERCOM3 PAD2 / TC3 |
| Pin 28 | PA25 — GPIO / SERCOM3 PAD3 / TC3 |
| Pin 29 | VDD — Digital supply voltage |
| Pin 30 | VSS — Digital ground |
| Pin 31 | PB00 — GPIO / SERCOM5 PAD2 / TC4 |
| Pin 32 | PB01 — GPIO / SERCOM5 PAD3 / TC4 |
| Pin 33 | PB02 — GPIO / SERCOM5 PAD0 / TC5 |
| Pin 34 | PB03 — GPIO / SERCOM5 PAD1 / TC5 |
| Pin 35 | PB04 — GPIO / SERCOM4 PAD0 |
| Pin 36 | PB05 — GPIO / SERCOM4 PAD1 |
| Pin 37 | PB06 — GPIO / SERCOM4 PAD2 |
| Pin 38 | PB07 — GPIO / SERCOM4 PAD3 |
| Pin 39 | PB08 — GPIO / SERCOM4 PAD0 / TC0 |
| Pin 40 | PB09 — GPIO / SERCOM4 PAD1 / TC0 |
| Pin 41 | PB10 — GPIO / SERCOM4 PAD2 / TC0 |
| Pin 42 | PB11 — GPIO / SERCOM4 PAD3 / TC0 |
| Pin 43 | PB12 — GPIO / SERCOM4 PAD0 / TC0 |
| Pin 44 | PB13 — GPIO / SERCOM4 PAD1 / TC0 |
| Pin 45 | PB14 — GPIO / SERCOM4 PAD2 / TC0 |
| Pin 46 | PB15 — GPIO / SERCOM4 PAD3 / TC0 |
| Pin 47 | PB16 — GPIO / SERCOM5 PAD0 / TC1 |
| Pin 48 | PB17 — GPIO / SERCOM5 PAD1 / TC1 |
| Pin 49 | PB18 — GPIO / SERCOM5 PAD2 / TC1 |
| Pin 50 | PB19 — GPIO / SERCOM5 PAD3 / TC1 |
| Pin 51 | PB20 — GPIO / SERCOM3 PAD0 / TC1 |
| Pin 52 | PB21 — GPIO / SERCOM3 PAD1 / TC1 |
| Pin 53 | PB22 — GPIO / SERCOM3 PAD2 / TC1 |
| Pin 54 | PB23 — GPIO / SERCOM3 PAD3 / TC1 |
| Pin 55 | VDD — Digital supply voltage |
| Pin 56 | VSS — Digital ground |
| Pin 57 | RESET — Reset input, active low |
| Pin 58 | SWDIO — Serial Wire Debug I/O |
| Pin 59 | SWDCLK — Serial Wire Debug clock |
| Pin 60 | PA27 — GPIO / SERCOM3 PAD3 |
| Pin 61 | PA28 — GPIO / SERCOM5 PAD2 |
| Pin 62 | PA29 — GPIO / SERCOM5 PAD3 |
| Pin 63 | PA30 — GPIO / SERCOM1 PAD2 |
| Pin 64 | PA31 — GPIO / SERCOM1 PAD3 |
Typical Applications
ATSAMD20J16B-AU is suitable for 6 applications: Home Automation Sensor Node, Capacitive Touch HMI, Smart Metering Endpoint, Consumer Appliance Control, Industrial Control Module, IoT Wearable / BLE Host Bridge.
Home Automation Sensor Node
The ATSAMD20J16B-AU's 64 KB Flash and 8 KB SRAM comfortably fit Zigbee or Matter bridge stacks over its 6 SERCOM (UART/SPI/I2C). Its 1.6 V to 3.6 V supply runs directly from two AA cells, while the 256-channel PTC adds capacitive buttons without an external touch IC. The 12-bit ADC reads temperature, humidity and PIR sensors, and the 10-bit DAC drives analog reference levels for downstream sensors. The Cortex-M0+ at 48 MHz and 6-channel Event System let the MCU wake, sample and return to sleep within microseconds, achieving multi-year battery life in smart-home end devices.
Recommended
Capacitive Touch HMI
The 256-channel Peripheral Touch Controller on the ATSAMD20J16B-AU supports self-capacitance and mutual-capacitance sensing for buttons, sliders and wheels. Its 12-bit ADC and 10-bit DAC drive LCD bias voltages, while the 6 SERCOM channels drive SPI displays or I2C sensor expansion. Running from 1.6 V to 3.6 V allows direct 2-cell AA battery operation in remote controls and kitchen appliances. Industrial -40 C to +85 C temperature grading handles demanding environments such as oven-control panels and outdoor thermostats.
Recommended
Smart Metering Endpoint
In electricity, gas and water meters, the ATSAMD20J16B-AU's RTC with calendar mode enables accurate time-stamping of consumption events, while its 12-bit ADC samples CT or shunt current sensors at 350 ksps. The 64 KB Flash stores calibration tables, and the 8 KB SRAM buffers measurement frames before wireless transmission via SERCOM-configurable UART or SPI to a sub-GHz radio. The 1.6 V to 3.6 V range supports single-cell Li-FeS2 batteries, and Sleep/Standby modes keep average current draw under 5 uA for 10+ year deployments.
Recommended
Consumer Appliance Control
The ATSAMD20J16B-AU drives coffee machines, air purifiers and white goods with up to 48 MHz compute, 6-channel DMA, and a 12-bit ADC that reads thermistors and flow sensors. The 6 SERCOM blocks connect to Wi-Fi modules (SPI), BLE modules (UART), displays (SPI/I2C) and keypads, all pin-muxed on the 64-pin TQFP. The 10-bit DAC generates analog setpoint voltages for motor or valve controllers, and the RTC schedules start/stop events without CPU load.
Recommended
Industrial Control Module
The ATSAMD20J16B-AU operates across -40 C to +85 C industrial temperatures, fitting factory-floor sensor hubs and PLC expansion cards. Its 12-bit ADC with up to 20 channels reads 4-20 mA loops via external conditioning, while the 10-bit DAC sets analog outputs for actuator control. SERCOM channels support RS-485 transceivers (UART), SPI to digital isolators, and I2C to EEPROM/RTC backup. The 64-pin TQFP exposes sufficient GPIO for indicator LEDs, optocoupler inputs and relay drive transistors in industrial I/O modules.
Recommended
IoT Wearable / BLE Host Bridge
As a low-cost host for a BLE or sub-GHz transceiver module, the ATSAMD20J16B-AU's 6 SERCOM blocks provide dedicated UART/SPI interfaces for the radio plus I2C for sensors (heart rate, IMU). The 64 KB Flash hosts BLE GATT tables and OTA bootloaders, while the 8 KB SRAM buffers sensor fusion pipelines. The 1.6 V to 3.6 V supply runs from a single Li-ion or coin cell, and Sleep/Standby modes keep idle current under 1 uA for fitness bands, beacons and wearable patches.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD20J16B-AU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD20J16B-AUT | ATSAMD20J16A-AU | ATSAMD20J15A-AU | ATSAMD20J16B-AN |
|---|---|---|---|---|---|
| Package | 64-pin TQFP | 64-pin TQFP - same | 64-pin TQFP - same | 64-pin TQFP - same | 64-pin TQFP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Flash | 64 KB | 64 KB | 64 KB | 32 KB | 64 KB |
| SRAM | 8 KB | 8 KB | 8 KB | 4 KB | 8 KB |
| Maximum CPU Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Operating Voltage | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V |
| Temperature Grade | Industrial -40 C to +85 C | Industrial | Industrial | Industrial | Industrial |
| Silicon Revision | B | B | A | A | B |
| Packaging Form | Tray (AU) | Tape & Reel (AUT) | Tray (AU) | Tray (AU) | Tray (AN) |
Key Differentiators
- Same die, lower-cost 32 KB Flash drop-in (vs ATSAMD20J15A-AU)
- Silicon revision B over A for errata fixes (vs ATSAMD20J16A-AU)
- Reel-ready drop-in for high-volume assembly (vs ATSAMD20J16B-AUT)
Design Notes
The ATSAMD20J16B-AU accepts 1.6 V to 3.6 V on each VDD pin. Place a 100 nF X7R decoupling capacitor within 5 mm of every VDD/VSS pair, and add one bulk 4.7 uF ceramic on the main regulator output. For battery-powered designs, route two AA cells directly to VDD and rely on the internal DCDC converter (when enabled on the die) to generate the 1.2 V core voltage. Active current at 48 MHz is typically 6 mA; Sleep mode drops to 1 uA and Standby to 700 nA per datasheet.
Route the 64-pin TQFP with 0.5 mm pitch using 0.2 mm trace/space rules on a 4-layer PCB. The exposed thermal pad on the underside (where present) must be soldered to a copper pour stitched with 0.3 mm thermal vias to the inner ground plane. Place the SWD header (2x5 0.05-inch) within 50 mm of the SWDIO and SWDCLK pins to keep debug cable capacitance under 50 pF and ensure reliable programming with Atmel-ICE or J-Link.
Do not leave RESET floating; tie it to VDD via a 10 kohm pull-up with a 100 nF cap to ground for debounce. The 32 kHz crystal pins (PA00/PA01) require a load capacitance matching the crystal's C_L specification; the on-chip load capacitors (default 8 pF selectable) must be configured in the SYSCTRL or you will see oscillator startup failures. The PTC touch pins share analog channels; if you enable both ADC and PTC on the same pin, switch via the PMUX register at runtime to avoid contention.
Compliance Information
RoHS compliant (Green) per Microchip product page and Mouser listing. Industrial temperature grade -40 C to +85 C. Not AEC-Q100 qualified (consumer/industrial use, not automotive).
