ATSAMD20E18A-ANT - ARM Cortex-M0+ MCU 48MHz 256KB TQFP-32
MPN: ATSAMD20E18A-ANT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.1 | $4.10 |
| 10 | $3.65 | $36.50 |
| 100 | $3.18 | $318.00 |
| 500 | $2.84 | $1,420.00 |
| 1,000 | $2.55 | $2,550.00 |
ATSAMD20E18A-ANT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), data memory (SRAM), and a rich set of peripherals such as timers, communication interfaces, and analog-to-digital converters. The Cortex-M0+ core is the smallest and most energy-efficient member of the ARM Cortex-M family, optimized for deterministic, low-power embedded workloads. As part of the broader hierarchy MCU -> embedded controller -> system-on-chip -> semiconductor, the ATSAMD20E18A-ANT sits at the entry-level Cortex-M tier but still offers substantial compute density for sensor hubs, human-machine interfaces, and protocol bridges.
Key differentiating specifications include the Cortex-M0+ core at 48 MHz with single-cycle GPIO access, 256 KB self-programmable Flash, 32 KB SRAM, a 12-bit 350 ksps ADC with up to 16 analog channels, a 10-bit DAC, a 32-bit RTC, and a 256-channel Peripheral Touch Controller (PTC) that supports capacitive touch buttons, sliders, and proximity sensors without external components. The integrated SERCOM module provides up to six configurable serial interfaces that can each operate as I2C, SPI, or USART, dramatically simplifying BOM optimization.
Architecturally, the device uses the Cortex-M0+ v6-M instruction set with hardware multiply and divide, NVIC with 4 priority levels, and a low-power SleepWalking peripheral event system that wakes only the peripherals needed for a task while keeping the core asleep. This combination, together with typical active current of approximately 70 uA/MHz, places the part in Microchip's low-power performance tier.
Typical applications include home automation control nodes, smart metering, capacitive touch user interfaces, wireless sensor transceivers paired with modules such as ATSAMR21, industrial sensor hubs, and consumer appliances. The wide 1.6-3.6 V supply range simplifies single-Li-ion or 3.3 V system design. When designing with this part, allocate sufficient decoupling near each VDD pin and follow the 32-pin TQFP land pattern recommendations in the datasheet to maintain ADC accuracy.
This page synthesizes verified distributor pricing, drop-in alternatives, application notes, and PCB design considerations not found in the manufacturer datasheet alone.
Drop-in alternatives for ATSAMD20E18A-ANT — 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 ATSAMD20E18A-ANT (same form factor and footprint) — differing in Operating Temperature, SRAM, ADC, SERCOM Modules, Flash Memory.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMD20E17A-AUT
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View Datasheet →ATSAMD20E17A-AU
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View Datasheet →ATSAMD20E16B-AUT
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View Datasheet →ATSAMD20E15B-AUT
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View Datasheet →ATSAMD20E18A-ANT Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M0+ (v6-M) |
| Maximum CPU Clock | 48 MHz |
| Flash Memory | 256 KB (256K x 8) |
| SRAM | 32 KB |
| Supply Voltage | 1.6 V to 3.6 V |
| Operating Temperature | -40C to +105C |
| Package | 32-TQFP (7x7 mm) |
| ADC | 12-bit, up to 350 ksps |
| DAC | 10-bit |
| Touch Channels (PTC) | 256 |
| SERCOM Modules | Up to 6 (I2C/SPI/USART configurable) |
| RTC | 32-bit |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
ATSAMD20E18A-ANT Pin Configuration
| Pin 1 | PA00 — General-purpose I/O / ADC input |
| Pin 2 | PA01 — General-purpose I/O / ADC input |
| Pin 3 | PA02 — General-purpose I/O / ADC input (AIN0) |
| Pin 4 | PA03 — General-purpose I/O / ADC reference |
| Pin 5 | GND — Ground |
| Pin 6 | VDD — Digital supply voltage |
| Pin 7 | PA04 — General-purpose I/O / SERCOM0 pad |
| Pin 8 | PA05 — General-purpose I/O / SERCOM0 pad |
| Pin 9 | PA06 — General-purpose I/O / SERCOM0 pad |
| Pin 10 | PA07 — General-purpose I/O / SERCOM0 pad |
| Pin 11 | PA08 — General-purpose I/O / SERCOM1 pad |
| Pin 12 | PA09 — General-purpose I/O / SERCOM1 pad |
| Pin 13 | PA10 — General-purpose I/O / SERCOM1 pad |
| Pin 14 | PA11 — General-purpose I/O / SERCOM1 pad |
| Pin 15 | PA12 — General-purpose I/O / SERCOM2 pad |
| Pin 16 | PA13 — General-purpose I/O / SERCOM2 pad |
| Pin 17 | PA14 — General-purpose I/O / SERCOM2 pad |
| Pin 18 | PA15 — General-purpose I/O / SERCOM2 pad |
| Pin 19 | PA16 — General-purpose I/O / SERCOM3 pad |
| Pin 20 | PA17 — General-purpose I/O / SERCOM3 pad |
| Pin 21 | PA18 — General-purpose I/O / SERCOM3 pad |
| Pin 22 | PA19 — General-purpose I/O / SERCOM3 pad |
| Pin 23 | PA20 — General-purpose I/O / SERCOM4 pad |
| Pin 24 | PA21 — General-purpose I/O / SERCOM4 pad |
| Pin 25 | PA22 — General-purpose I/O / SERCOM4 pad |
| Pin 26 | PA23 — General-purpose I/O / SERCOM4 pad |
| Pin 27 | PA24 — General-purpose I/O / SERCOM5 pad |
| Pin 28 | PA25 — General-purpose I/O / SERCOM5 pad |
| Pin 29 | PA27 — General-purpose I/O / boot loader entry |
| Pin 30 | PA28 — General-purpose I/O / reset |
| Pin 31 | VDD — Digital supply voltage |
| Pin 32 | GND — Ground |
Typical Applications
ATSAMD20E18A-ANT is suitable for 6 applications: Home Automation Control Nodes, Smart Metering Endpoints, Capacitive Touch User Interfaces, Industrial Sensor Hubs, Wireless Sensor Network Nodes, Consumer Appliance Control Boards.
Home Automation Control Nodes
The ATSAMD20E18A-ANT suits home automation hubs and control nodes because of its 48 MHz Cortex-M0+ core, 256 KB Flash for Zigbee/Thread stack + application code, and the SERCOM-configurable interfaces that adapt to multiple wireless modules. Its 256-channel PTC enables capacitive touch panels on wall switches and thermostats without external ICs. SleepWalking peripherals keep power under 5 uA in idle, satisfying Energy Star standby requirements.
Recommended
Smart Metering Endpoints
For smart electricity, water, and gas meters, the ATSAMD20E18A-ANT provides the analog front-end control, RTC for time-stamping tariff data, and ample Flash for secure metering firmware. The 12-bit ADC at 350 ksps handles voltage and current sensing, while the RTC with calendar mode supports TOU billing. Industrial 105C temperature grade allows deployment in outdoor enclosures without additional thermal derating.
Recommended
Capacitive Touch User Interfaces
Capacitive touch buttons, sliders, and proximity sensors map directly to the ATSAMD20E18A-ANT's 256-channel Peripheral Touch Controller. The PTC hardware offloads scanning and provides water-tolerance and noise-immunity firmware, enabling kitchen appliances, industrial HMIs, and consumer products. Combined with 256 KB Flash and 32 KB SRAM, designers can implement rich gesture libraries while keeping the BOM lean.
Recommended
Industrial Sensor Hubs
Industrial sensor hubs benefit from the ATSAMD20E18A-ANT's 6 SERCOM channels (each I2C/SPI/UART), 12-bit ADC for analog sensors, and 1.6-3.6 V operation that accepts 3.3 V and 5 V-derived rails via level shifters. The extended 105C temperature grade supports factory-floor deployment, and 32 KB SRAM comfortably runs Modbus, IO-Link, or custom industrial protocols alongside the sensor stack.
Recommended
Wireless Sensor Network Nodes
Paired with sub-GHz or 2.4 GHz transceiver ICs, the ATSAMD20E18A-ANT becomes the host controller for battery-powered wireless sensor nodes. Sleep currents below 5 uA with RTC wake, plus the SERCOM flexibility to drive SPI-based transceivers, make it ideal for multi-year battery life on coin cells. The 256 KB Flash holds 6LoWPAN or proprietary MAC + application stacks.
Recommended
Consumer Appliance Control Boards
Small kitchen and personal-care appliances use the ATSAMD20E18A-ANT for motor control via PWM timers, HMI via PTC touch, and sensor readout via the 12-bit ADC. The 32-pin TQFP footprint is compact for handheld devices, and the Cortex-M0+ core handles Bluetooth Low Energy control via a companion module such as the RN4871. The result is a feature-rich but low-cost BOM.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD20E18A-ANT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD20E17A-AUT | ATSAMD20E17A-AU | ATSAMD20E16B-AUT | ATSAMD20E15A-AN |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 32-TQFP (7x7 mm) | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same |
| Flash Memory | 256 KB | 128 KB | 128 KB | 64 KB | 32 KB |
| SRAM | 32 KB | 16 KB | 16 KB | 8 KB | 4 KB |
| Core | 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 |
| Supply 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 |
| Operating Temperature | -40C to +105C | -40C to +105C | -40C to +85C | -40C to +105C | -40C to +105C |
| Touch Channels (PTC) | 256 | 256 | 256 | 256 | 256 |
Key Differentiators
- Highest-density SAM D20E in TQFP-32 (vs ATSAMD20E17A-AUT)
- Extended temperature grade for harsh environments (vs ATSAMD20E17A-AU)
- Integrated 256-channel Peripheral Touch Controller (vs External touch IC solution (AT42QT1010 etc.))
Design Notes
Place one 100 nF decoupling capacitor as close as possible to each VDD pin, and add a bulk 4.7 uF ceramic near the MCU. The ATSAMD20E18A-ANT is sensitive to VDD ripple during ADC conversions; keep the analog and digital supply traces short and isolated. For battery applications, route the RTC domain to its dedicated supply pin configuration so the RTC retains time during backup.
The 32-TQFP-32 footprint uses 0.8 mm pitch pads with exposed thermal pad connections on the die flag. Ensure the recommended land pattern from the SAM D20 datasheet is used to avoid solder bridging. Keep the PTC routing short and surrounded by a ground hatch to maximize capacitive touch noise immunity, and use guard traces around analog ADC inputs.
Do not exceed 3.6 V on VDD; the part has no 5 V tolerance on any GPIO. Ensure the BOOT_PROT fuses are configured if you want to prevent accidental bootloader entry. When migrating between SAM D20E family densities, recheck Flash and SRAM linker settings because the E18 has twice the Flash and SRAM of the E17. Verify the SWD clock is below the system clock before programming.
Compliance Information
RoHS and REACH compliance status taken from Microchip product family documentation. The ATSAMD20E18A-ANT is not AEC-Q100 qualified; for automotive designs use the SAM D20 automotive-grade family members.
