ATSAMD20G15B-MUT - 32KB Flash Cortex-M0+ MCU 48-QFN | Microchip
MPN: ATSAMD20G15B-MUT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.29 | $2.29 |
| 10 | $2.05 | $20.50 |
| 100 | $1.78 | $178.00 |
| 500 | $1.55 | $775.00 |
| 1,000 | $1.38 | $1,380.00 |
ATSAMD20G15B-MUT Overview
A microcontroller (MCU) is an integrated circuit that combines a CPU core, program and data memory, peripherals, and I/O on a single silicon die. The Cortex-M0+ is ARM's smallest and most energy-efficient application processor core, typically used as a stepping stone between 8/16-bit legacy MCUs and higher-end Cortex-M3/M4 parts. The SAM D20G family sits within Microchip's broader SAM (Smart ARM) portfolio, bridging tiny AVR/PIC parts and higher-end Cortex-M based SAM S70/E70 devices.
Key features of the ATSAMD20G15B-MUT include the SERCOM (Serial Communication Interface) module which can be configured as UART, SPI, or I2C; a 12-bit ADC with up to 200 ksps throughput; a 10-bit DAC; and an Event System for inter-peripheral signaling without CPU wake-up. Power consumption is rated at down to sub-uA in deep-sleep backup mode, with multiple SleepWalking peripheral channels.
The device implements Microchip's proprietary Atmel Start code-generation framework and is fully supported by Atmel Studio 7, MPLAB X IDE, and Microchip Studio for GCC-based development. The Cortex-M0+ core includes the ARMv6-M instruction set, hardware multiply (32-bit result in one cycle), and a single-cycle I/O port.
Typical applications include home automation endpoints, smart metering nodes, consumer electronics HIDs, industrial sensor interfaces, and low-power IoT edge nodes where battery life and small footprint outweigh raw CPU throughput. The SERCOM-rich architecture also simplifies BOM reuse across UART, SPI, and I2C sensor variants.
When designing with this part, budget decoupling capacitance (100 nF X7R + 1 uF X5R minimum on each VDD pin) and follow Microchip's QFN land pattern with a contiguous ground pad beneath the EP for thermal dissipation. Programming is supported through the SWD interface, requiring PA30 (SWDCLK) and PA31 (SWDIO) to be reserved or strapped appropriately.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives within the SAM D20 family, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for ATSAMD20G15B-MUT — 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 ATSAMD20G15B-MUT (same form factor and footprint) — differing in ADC, DAC, Package, SERCOM Modules, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMD20G16B-MUT
✅ Drop-In✓ In Stock
$2.78 / Unit
View Datasheet →ATSAMD20G14B-MUT
✅ Drop-In✓ In Stock
$1.1 / Unit
View Datasheet →ATSAMD20G17B-MUT
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMD20G15B-AUT
✅ Drop-In✓ In Stock
$2.13 / Unit
View Datasheet →ATSAMD20E15B-MU
✅ Drop-In✓ In Stock
$1.1 / Unit
View Datasheet →ATSAMD20G15B-MUT Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M0+ (ARMv6-M) |
| CPU Clock Speed (max) | 48 MHz |
| Flash Memory | 32 KB (32K x 8) |
| SRAM | 4 KB |
| Package | 48-QFN (7x7 mm) with exposed pad |
| Operating Voltage | 1.62 V to 3.6 V |
| Operating Temperature | -40 C to +85 C (Industrial) |
| I/O Pins | 38 |
| ADC | 12-bit, up to 200 ksps |
| DAC | 10-bit |
| Serial Interfaces (SERCOM) | 6 (configurable as UART/SPI/I2C) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Pin Count | 48 |
| Packaging | Tape & Reel |
ATSAMD20G15B-MUT 48-qfn (7x7 mm) with exposed pad Pin Configuration Guide
Pin configuration for ATSAMD20G15B-MUT (48-qfn (7x7 mm) with exposed pad 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 ATSAMD20G15B-MUT.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAMD20G15B-MUT is suitable for 7 applications: Home Automation Endpoints, Smart Metering Nodes, Industrial Sensor Interfaces, Consumer Electronics HIDs (Human Interface Devices), Wearable Fitness/Health Bands, Low-Power IoT Edge Nodes, HVAC Control Panels.
Home Automation Endpoints
The ATSAMD20G15B-MUT's 32 KB flash, 4 KB SRAM, and 48 MHz Cortex-M0+ core make it well-suited for low-power home automation endpoints such as Zigbee/Wi-Fi bridge nodes, smart switches, and sensor hubs. The 6 SERCOM modules can simultaneously drive a UART to a wireless module, an I2C temperature/humidity sensor, and an SPI OLED display, all without CPU-driven bit-banging. Deep-sleep current below 1 uA combined with SleepWalking peripherals allows battery-powered door/window sensors to run for years on a single CR2032. The 12-bit ADC supports capacitive touch sensing on multiple pins, eliminating mechanical buttons on white-goods panels.
Recommended
Smart Metering Nodes
In gas, water, and electricity metering applications the ATSAMD20G15B-MUT provides the precise 12-bit ADC resolution and low-noise performance required for analog front-end conditioning. The 48 MHz core can run metering algorithms (instantaneous power, RMS, harmonic analysis) while the SERCOM interfaces connect to PLC or RF modems. With the integrated 10-bit DAC and event system, calibration and compensation routines execute without CPU wake-up, extending battery life. Industrial temperature grade (-40 to +85 C) covers outdoor meter enclosures.
Recommended
Industrial Sensor Interfaces
Factory sensor modules benefit from the ATSAMD20G15B-MUT's 1.62-3.6 V wide supply range, robust ESD, and SERCOM flexibility for UART/SPI/I2C industrial protocols. The 12-bit ADC handles 4-20 mA loop and 0-10 V analog sensor inputs after external scaling. Industrial temperature rating and QFN packaging suit sealed IP67 housings. The Cortex-M0+ core delivers deterministic interrupt latency for MODBUS RTU slave stacks running over RS-485 transceivers. With 4 KB SRAM the device can buffer sensor data for MODBUS/IO-Link transmission between host PLCs.
Recommended
Consumer Electronics HIDs (Human Interface Devices)
The ATSAMD20G15B-MUT powers USB-style HIDs using its SERCOM peripherals configured as UART bridges to BLE/2.4 GHz SoCs, plus hardware capacitive touch via the PTC (Peripheral Touch Controller). The 48 MHz core runs HID descriptor stacks and button/glyph logic with sub-frame latency. With the SAM D20 family Bootloader (DFU), firmware updates can be field-deployed over USB sticks when paired with a downstream bridge. Industrial temperature and small 7x7 mm QFN fit compact consumer remote and game controller form factors.
Recommended
Wearable Fitness/Health Bands
Wearable designs benefit from the ATSAMD20G15B-MUT's sub-uA deep-sleep current and SleepWalking peripherals for heart-rate, motion, and skin-temperature sensors. The Cortex-M0+ core offloads Bluetooth Low Energy HCI traffic to a companion RN4870 or ATSAMB11 gas module while the 32 KB flash holds device-side sensor fusion and step-counting code. The 12-bit ADC digitizes PPG (photoplethysmography) and bio-impedance signals with sufficient resolution. Compact 7x7 mm QFN footprint fits slim wristbands and chest straps.
Recommended
Low-Power IoT Edge Nodes
Edge nodes running simple classification, anomaly detection, or HVAC control benefit from the ATSAMD20G15B-MUT's 48 MHz throughput and 4 KB SRAM for tinyML inference or model storage. The 32 KB flash holds the application plus a lightweight TCP/IP-over-Wi-Fi stack. Deep-sleep mode plus RTC wake-up extends coin-cell life to years. The 6 SERCOM channels can simultaneously drive LoRa, I2C sensors, and SPI flash. Industrial temperature grade supports outdoor enclosures and LoRaWAN deployments.
Recommended
HVAC Control Panels
HVAC controllers and thermostats use the ATSAMD20G15B-MUT to drive character/graphic LCDs via SPI, read temperature/humidity via I2C, and run PID loops for fan/valve control. The 12-bit ADC reads thermistor bridges with 0.1 C resolution over typical operating ranges. Six SERCOM peripherals support multiple sensor buses without bit-banging, while the Event System offloads inter-peripheral signaling from the core. Industrial temperature range suits attic-mounted HVAC enclosures.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD20G15B-MUT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD20G16B-MUT | ATSAMD20G14B-MUT | ATSAMD20G17B-MUT | ATSAMD20G15B-AUT | ATSAMD20E15B-MU |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-QFN (7x7 mm) | 48-QFN (7x7 mm) - same | 48-QFN (7x7 mm) - same | 48-QFN (7x7 mm) - same | 48-TQFP (7x7 mm) - different footprint | 48-QFN (7x7 mm) - same |
| Core | ARM Cortex-M0+ 48 MHz | ARM Cortex-M0+ 48 MHz | ARM Cortex-M0+ 48 MHz | ARM Cortex-M0+ 48 MHz | ARM Cortex-M0+ 48 MHz | ARM Cortex-M0+ 48 MHz |
| Flash | 32 KB | 64 KB | 16 KB | 128 KB | 32 KB | 32 KB |
| SRAM | 4 KB | 8 KB | 2 KB | 16 KB | 4 KB | 4 KB |
| USB | None | None | None | None | None | None |
| Operating Voltage | 1.62-3.6 V | 1.62-3.6 V | 1.62-3.6 V | 1.62-3.6 V | 1.62-3.6 V | 1.62-3.6 V |
Key Differentiators
- Highest-density 32 KB flash MCU in the SAM D20G family at the lowest cost point (vs ATSAMD20G14B-MUT (16 KB flash))
- True drop-in upgrade path with larger memory without PCB rework (vs ATSAMD20G16B-MUT (64 KB flash))
- Industrial temperature grade versus extended commercial alternatives (vs ATSAMD20G15A-MU (earlier revision))
Design Notes
Place a 100 nF X7R 0402 (or 0603) decoupling capacitor as close as possible (within 2 mm trace length) to each VDD pin of the ATSAMD20G15B-MUT, plus a single bulk 1 uF-4.7 uF X5R capacitor on the main VDDIN rail. The internal 1.2 V core LDO also requires its own 1 uF capacitor on the VCORE pin. Insufficient decoupling leads to ADC noise and brown-out resets at high core loads.
Solder the exposed thermal pad (EP) of the 48-QFN package to a continuous ground plane using 4-6 thermal vias (0.3 mm drill, 0.5 mm pitch) for heat dissipation. Although the Cortex-M0+ draws limited current, the EP provides both electrical ground and thermal relief at industrial temperature extremes. Without EP soldering, the part may exceed 110 C junction under sustained 48 MHz operation in sealed enclosures.
Reserve PA30 (SWDCLK) and PA31 (SWDIO) for the SWD programming/debug interface. Avoid using these pins for GPIO in your firmware unless you provide an alternative boot path. Microchip's GPNVM (General Purpose Non-Volatile Memory) bit must be set to enable SWD after a power-on reset; for production programming include a 10-pin Cortex Debug connector on the PCB for JTAG/SWD access.
Do not exceed the absolute maximum VDD of 3.6 V. The ATSAMD20G15B-MUT does not have 5 V tolerant GPIO - driving any pin above VDDIO + 0.3 V may damage the silicon. Use a level translator (e.g. TXS0108E) for 5 V peripherals. Also, the SERCOM pin multiplex must be configured BEFORE peripheral enable; otherwise the peripheral will not function.
Compliance Information
RoHS and REACH compliance per Microchip product page (last verified 2026-09-21). Not AEC-Q100 qualified; for automotive designs use ATSAMx70 family or vendor-supplied -Q1 variants.
