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ATSAML21G16B-MNT - 48MHz ARM Cortex-M0+ MCU, 64KB Flash | Microchip
ATSAML21G16B-MNT

ATSAML21G16B-MNT - 48MHz ARM Cortex-M0+ MCU, 64KB Flash | Microchip

The Microchip Technology ATSAML21G16B-MNT is an ultra-low-power 32-bit ARM Cortex-M0+ Flash microcontroller (MCU) in the SAM L21 family, operating at up to 48 MHz with 64 KB of Flash and 8 KB of SRAM, housed in a 48-pin QFN (7x7 mm) package. According to the Microchip SAM L21 family datasheet (DS60001477C), this device consumes under 35 µA/MHz in active mode and as little as 200 nA in Sleep mode, targeting battery-powered and energy-harvesting applications. What is an ARM Cortex-M0+ microcontroller? An ARM Cortex-M0+ microcontroller is a 32-bit RISC processor core designed for embedded systems that need deterministic real-time performance at very low power consumption. The Cortex-M0+ sits at the low-power end of the ARM Cortex-M family, using the Armv6-M architecture and the Thumb-2 instruction set, and integrates a Nested Vectored Interrupt Controller (NVIC) and Wake-up Interrupt Controller (WIC). MCUs based on this core (microcontroller -> RISC processor -> embedded processor -> semiconductor) are widely used in IoT, sensor hubs, wearables, and battery-powered industrial nodes. Key features of the ATSAML21G16B-MNT include the Cortex-M0+ core at 48 MHz, 64 KB Flash, 8 KB SRAM, multiple low-power modes (Sleep at 200 nA, Standby, Backup, and Off), 14 SERCOM channels (which can be configured as I2C, SPI, or UART), a 12-bit ADC with up to 20 channels, and built-in touch-support peripherals. The 48-pin QFN (7x7 mm) package provides a compact footprint with an exposed thermal pad for improved thermal dissipation in space-constrained designs. Technically, the SAM L21 family is built on an ultra-low-power process and integrates a sophisticated power management unit (PMU) that selects among active, idle, sleep, standby, backup, and off modes on a per-peripheral basis. The on-chip voltage regulator supports operation from 1.6 V to 3.6 V, and the device includes up to 5 SERCOM, 1 TC, 1 TCC, and various analog peripherals depending on pin count. The -MNT suffix denotes the 48-QFN package operating from -40°C to 85°C industrial range. Typical applications include IoT sensor nodes, wearable health and fitness devices, smart home sensors, low-power wireless modules, industrial battery-powered meters, and Human-Machine Interface (HMI) control with touch. The combination of 200 nA Sleep current and fast wake-up makes it ideal for systems that spend most of their time in deep sleep and only wake briefly to take measurements. When designing with the ATSAML21G16B-MNT, ensure that firmware implements proper Sleep mode entry via the ARM Wait-For-Interrupt (WFI) or Wait-For-Event (WFE) instructions, and that unused peripherals are clock-gated. The 48-QFN exposed pad must be soldered to the PCB ground plane for electrical and thermal performance. This page synthesizes distributor pricing, same-family alternatives, cross-references, and design notes not found in the manufacturer datasheet alone.

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ATSAML21G16B-MUT - 48MHz ARM Cortex-M0+ MCU 64KB Flash | Microchip
ATSAML21G16B-MUT

ATSAML21G16B-MUT - 48MHz ARM Cortex-M0+ MCU 64KB Flash | Microchip

The Microchip Technology ATSAML21G16B-MUT is a 32-bit ARM Cortex-M0+ microcontroller from the SAM L21G family, operating up to 48 MHz with 64 KB of Flash and 8 KB of SRAM, housed in a 48-pin QFN (7x7 mm) package. It belongs to Microchip's ultra-low-power SAM L21 family, consuming under 35 uA/MHz in active mode and 200 nA in Sleep mode, and supports an extended industrial temperature range of -40C to +85C. The device is supplied with a 3.3 V typical operating voltage. An ARM Cortex-M0+ microcontroller is a 32-bit RISC processor core designed for energy-efficient embedded applications. It belongs to the ARM Cortex-M family (microcontroller class), within the broader ARM Cortex processor hierarchy. Cortex-M0+ cores integrate the processor, NVIC, debug logic and (in some implementations) Memory Protection Unit (MPU) on-chip, enabling deterministic real-time control at sub-dollar price points. The SAM L21 family adds Microchip's proprietary picoPower technology and a peripheral event system that lets peripherals trigger each other without CPU wake-up, which is why this MCU achieves Sleep currents below 200 nA. Key features of the ATSAML21G16B-MUT include SERCOM-configurable serial interfaces (up to 6), a 12-bit 1 MSPS ADC, 10-bit DAC, multiple timers (TC, TCC), a Real-Time Clock with calendar mode, and a full-speed USB 2.0 device controller. The device also integrates a segmented LCD driver (up to 8x32 segments) and a crypto engine supporting AES, SHA, and secure boot for tamper-resistant applications. The architecture uses a 2-layer AHB bus matrix connecting the Cortex-M0+ core to Flash, SRAM, and peripherals via separate low-power buses. The SleepWalking peripheral event system allows I/O and ADC-triggered wake-ups without CPU intervention, making it ideal for always-on IoT endpoints that spend most of their life in deep Sleep modes. The QFN-48 (7x7 mm) package with an exposed pad provides low thermal resistance for thermally constrained designs. Typical applications include battery-powered IoT sensor nodes, wearable fitness/health devices, smart utility metering, electronic shelf labels, and remote control units. The combination of 64 KB Flash, USB, and segmented LCD support makes it a strong fit for low-power connected devices requiring a small display. When designing with the SAM L21, prioritize using the SAM L21 Event System and SleepWalking to keep the CPU in Sleep mode as long as possible. Decouple VDDIO and VDDCORE properly with 100 nF ceramic capacitors close to each pin, and connect the QFN exposed pad to a continuous ground plane for thermal and electrical reference. This page synthesizes distributor pricing, drop-in SAM L21 alternatives, and practical design notes not found in the manufacturer datasheet alone, including cross-brand ultra-low-power Cortex-M0+ options.

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ATSAML21G17B-ANT - 48MHz ARM M0+ MCU 128KB | Microchip
ATSAML21G17B-ANT

ATSAML21G17B-ANT - 48MHz ARM M0+ MCU 128KB | Microchip

The Microchip Technology ATSAML21G17B-ANT is an ultra-low-power ARM Cortex-M0+ 32-bit microcontroller from the SAM L21 family, delivering 48 MHz CPU performance with 128 KB of Flash and 16 KB of SRAM in a 48-pin TQFP (7x7 mm) package. The device integrates a sophisticated power management architecture with under 35 µA/MHz active current consumption and a deep Sleep mode current of just 200 nA, enabling years of battery operation on a single coin cell. Functional Safety (FuSa) features are integrated to support IEC 60730 Class B compliance in household appliances and similar safety-critical applications. A microcontroller (MCU) is an integrated circuit that combines a processor core, program memory (Flash), working memory (RAM), and a rich set of peripherals on a single chip. The Cortex-M0+ core is the most energy-efficient member of the ARM Cortex-M family and targets 8/16-bit migration designs where ultra-low power and deterministic interrupt response are critical. The SAM L21 extends this with Microchip's proprietary picoPower technology, event system, and SleepWalking peripherals that allow automated peripheral interaction without waking the CPU. Key features include 128 KB Flash (128K x 8), 16 KB SRAM, an 8-channel event system, up to 5 SERCOM serial communication peripherals (each reconfigurable as UART/SPI/I2C), a 12-bit 1 MSPS ADC, two analog amplifiers, two 24-bit timers, and a Real-Time Clock (RTC) with calendar and alarm. The device operates across 1.62 V to 3.63 V supply range, supports SleepWalking, has multiple low-power modes (Idle, Standby, Backup, Off), and provides a peripheral touch controller as well as a USB 2.0 Full-Speed device interface. Architecturally, the SAM L21 uses a Harvard bus architecture with separate AHB and APB bridges, providing deterministic memory access. The integrated voltage regulator supports core voltages down to 1.2 V with on-the-fly voltage scaling, enabling fine-grained power budgeting. The Peripheral Event System allows direct hardware-triggered communication between peripherals, offloading work from the CPU and supporting SleepWalking where peripherals can react to events without CPU intervention, achieving nA-range standby currents. Typical applications include battery-powered IoT sensor nodes, wearable health and fitness devices, smart home and HVAC remote controls, industrial wireless sensor networks, energy-harvesting endpoints, and consumer electronics requiring long battery life. The functional safety features make it particularly well-suited for white goods, fire and security alarm systems, and other IEC 60730-compliant appliances. When designing with this device, pay careful attention to the decoupling network (at minimum 100 nF X7R on each VDD pin plus a 4.7 µF bulk), use the on-board voltage regulator with the recommended inductor and capacitor combination for the DC-DC switch-mode power supply, and consult the errata sheet for revision-specific workarounds. Proper SleepWalking configuration can reduce average current by an order of magnitude in interrupt-driven applications. This page consolidates distributor pricing, drop-in pin-compatible alternatives within the SAM L21 family, and practical design notes not found in the manufacturer datasheet, helping engineers select the right variant and shorten their design cycle.

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ATSAML21G17B-MNT - 48MHz ARM Cortex-M0+ MCU, 128KB Flash | Microchip
ATSAML21G17B-MNT

ATSAML21G17B-MNT - 48MHz ARM Cortex-M0+ MCU, 128KB Flash | Microchip

The Microchip Technology ATSAML21G17B-MNT is a 32-bit ARM Cortex-M0+ ultra-low-power microcontroller from the SAM L21 family, featuring Functional Safety (FuSa) capability and housed in a 48-pin QFN (7x7 mm) package. Key headline parameters include 48 MHz CPU clock, 128 KB Flash program memory, 16 KB SRAM, and a 1.6V to 3.6V supply voltage range, with industrial -40C to +85C operating temperature. The -MNT suffix indicates QFN48 package, 85C grade, and Tape & Reel packaging. What is a low-power ARM Cortex-M0+ microcontroller? An ARM Cortex-M0+ MCU is a 32-bit reduced instruction set computing (RISC) microcontroller built around the ARM Cortex-M0+ processor core, the smallest and most energy-efficient core in the Cortex-M family. In the taxonomy hierarchy, the ATSAML21G17B-MNT is a microcontroller (MCU) -> ARM Cortex-M0+ MCU -> low-power MCU -> embedded microcontroller -> semiconductor IC. These ultra-low-power MCUs target battery-operated and energy-harvesting designs where active current under 35 uA/MHz and sleep current of 200 nA dramatically extend battery life. The ATSAML21G17B-MNT delivers 35 uA/MHz active power consumption and 200 nA Sleep mode current per the Microchip SAM L21 family datasheet. It integrates FuSa (Functional Safety) features suitable for IEC 60730 Class B compliance in home appliances and industrial safety applications, and includes the standard SAM L21 peripheral set: SERCOM, ADC, DAC, timers, and RTC. The 48-QFN (7x7) package provides excellent thermal performance and small PCB footprint for space-constrained designs. Architecturally, the SAM L21 family uses a Cortex-M0+ core with single-cycle I/O access, hardware multiplier, and Microchip's proprietary sleepwalking peripherals that wake individual peripherals without CPU intervention. The 128 KB Flash supports in-application programming (IAP) and the integrated True Random Number Generator (TRNG) plus AES hardware accelerator provide security primitives for IoT endpoints. Typical applications include battery-powered IoT sensor nodes, wearable health monitors, smart home automation, industrial wireless sensor networks, and functional-safety certified home appliances. The wide 1.6V to 3.6V supply range supports direct connection to single-cell Li-ion, 3V coin cells, and 3.3V regulated rails. When designing with this MCU, ensure the QFN48 thermal pad is soldered to a sufficient copper pour for heat dissipation. For FuSa applications, follow Microchip's Class B firmware library and verify all safety diagnostic tests pass under worst-case operating conditions. This page synthesizes distributor pricing, drop-in SAM L21 family alternatives, and practical low-power design guidance not aggregated on a single manufacturer datasheet page.

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ATSAML21G17B-MUT - 128KB Flash Cortex-M0+ MCU | Microchip
ATSAML21G17B-MUT

ATSAML21G17B-MUT - 128KB Flash Cortex-M0+ MCU | Microchip

The Microchip Technology ATSAML21G17B-MUT is an ultra-low-power 32-bit ARM Cortex-M0+ microcontroller from the SAM L21 family with 128KB Flash and 16KB SRAM, housed in a 48-pin QFN (7x7 mm) package. It operates at up to 48 MHz core frequency, delivers 2.46 CoreMark/MHz, and integrates a Functional Safety (FuSa) feature set aimed at safety-critical embedded systems. An ultra-low-power microcontroller (MCU) is a microprocessor optimized for energy-constrained applications such as battery-powered IoT nodes, wearables, and wireless sensor platforms. The ARM Cortex-M0+ core used here belongs to the ARM Cortex-M family, a 32-bit RISC architecture targeted at deeply embedded microcontrollers. The SAM L21 family extends the Cortex-M0+ line with Microchip's proprietary power-management technology, positioning the part above general-purpose Cortex-M0+ MCUs in active-mode efficiency and far below them in sleep-mode current. Key features of the ATSAML21G17B-MUT include <35 uA/MHz active current, 200 nA sleep-mode current, integrated SERCOM peripherals, a 12-bit ADC, and a hardware crypto block supporting AES and SHA. Functional Safety mechanisms include lockstep-friendly core, BOD, and parity-checked SRAM that simplify IEC 60730 / Class B safety firmware certification. The 48-QFN package exposes up to 36 GPIO and supports 1.62V to 5.5V supply via an internal buck/boost regulator. Architecturally, the device pairs an event-driven SleepWalking peripheral controller with a configurable sleep mode controller, allowing the CPU to wake only on pre-qualified events. Compared with the SAM D20/D21 family, the SAM L21 trades raw performance headroom for radically lower sleep-mode current and integrated FuSa diagnostics, making it the recommended choice when a Cortex-M0+ part must run for years from a coin cell. Typical applications include battery-powered IoT sensor nodes, wearable health monitors, smart-home edge devices, energy-harvesting wireless switches, and industrial HVAC controllers with safety diagnostics. The wide 1.62V-5.5V supply range is well-matched to single-cell Li-ion, 3.3V regulated, and 5V USB-powered rails. When designing with this part, budget the FPU-less Cortex-M0+ core for moderate DSP/Math workloads only; choose Cortex-M4F (SAM D/E families) for FFT-heavy signal chains. The QFN-48 land pattern is footprint-compatible with several SAM D20/D21 G variants, simplifying migration when more Flash is needed. This page synthesizes distributor pricing, drop-in alternatives, and SAM L21 design notes not found in the standalone datasheet.

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ATSAML21G17B-U - 48MHz Cortex-M0+ 128KB MCU | Microchip
ATSAML21G17B-U

ATSAML21G17B-U - 48MHz Cortex-M0+ 128KB MCU | Microchip

The Microchip ATSAML21G17B-U is an ultra-low-power ARM Cortex-M0+ microcontroller from the SAM L21G family with 128KB Flash and 16KB SRAM in a 48-pin WLCSP package, operating up to 48MHz. Built on sophisticated power management technology, it consumes under 35µA/MHz in active mode and only 200nA in Sleep mode, making it one of the most energy-efficient Cortex-M0+ MCUs available. What is an ultra-low-power microcontroller? An ultra-low-power MCU (ULP MCU) is a microcontroller designed specifically to minimize energy consumption across all operating states (active, sleep, deep-sleep, backup), enabling battery-powered products to operate for years on a single cell. ULPs combine low-leakage process technology, multi-domain power gating, and multiple low-power sleep modes; they sit within the broader category of embedded microcontrollers and are the heart of IoT, wearable, and energy-harvesting systems. Key features include 128KB Flash, 16KB SRAM, a Cortex-M0+ core with single-cycle multiplier, full-speed USB 2.0 device, and a rich peripheral set: SERCOM (configurable serial communication), 12-bit ADC, DAC, comparators, and PTC (Peripheral Touch Controller). Functional Safety (FuSa) features and a wide 1.62V-3.6V operating voltage range support industrial-grade applications. The SAM L21 architecture integrates an advanced power management unit (PMU) with multiple sleep modes (Sleep, Deep-Sleep, Backup, Off) and on-chip voltage regulators that power only the required logic domains. This fine-grained power gating, combined with Event System hardware interconnects, allows the CPU to stay in deep sleep while peripherals continue operating autonomously. Typical applications include IoT sensor nodes, wearable fitness bands, smart home devices, secure element companion MCUs, battery-powered medical monitors, and industrial wireless sensors. The integrated USB 2.0 full-speed device also makes it suitable for human-interface devices (HID) such as wireless presenters and BLE/LoRa sensor dongles. When designing with this MCU, ensure the supply decoupling follows the SAM L21 reference design: place 100nF X7R ceramic capacitors adjacent to each VDDCORE/VDDIO pin pair. The Backup domain requires a coin-cell or super-capacitor if RTC retention is needed during main power loss. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, with the verified snapshot as of 2026-10-07.

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ATSAML21G18B-ANT - 256KB Flash 48MHz Cortex-M0+ MCU | Microchip
ATSAML21G18B-ANT

ATSAML21G18B-ANT - 256KB Flash 48MHz Cortex-M0+ MCU | Microchip

The Microchip Technology ATSAML21G18B-ANT is an ultra-low-power 32-bit ARM Cortex-M0+ microcontroller from the SAM L21G family, featuring 256KB Flash, 32KB SRAM, and operating at up to 48 MHz, housed in a 48-pin TQFP (7x7 mm) package with operating temperature range of -40C to +85C. It supports a wide supply voltage range of 1.6V to 3.6V and consumes under 35 uA/MHz in active mode and only 200 nA in Sleep mode, making it ideal for battery-powered IoT edge nodes. An ARM Cortex-M0+ microcontroller is a 32-bit RISC processor core designed by ARM Holdings for embedded applications that require low power consumption, deterministic interrupt response, and a rich peripheral set. The Cortex-M0+ belongs to the broader ARM Cortex-M family of microcontrollers and integrates features such as single-cycle I/O port access, a low-latency interrupt controller (NVIC), and optional single-cycle hardware multiply. Within the system hierarchy, a microcontroller (MCU) sits inside the Integrated Circuits category, with microcontrollers being a subset of microprocessors specifically designed for standalone embedded control. The SAM L21 family extends this architecture with Microchip's proprietary ultra-low-power technology, including multiple Sleep modes, a power-on reset (POR) and brown-out detector (BOD), and on-chip peripherals that can operate while the CPU is asleep. Key features of the ATSAML21G18B include the Full-Speed USB 2.0 device and embedded host controller, a 12-bit 1 MSPS ADC, multiple SERCOM (serial communication) interfaces configurable as UART/SPI/I2C, a 32-bit RTC with calendar, and a Cryptographic Engine (CSE) supporting AES-128 and AES-256. The functional safety (FuSa) variant adds hardware diagnostic features. The peripheral touch controller (PTC) supports up to 256 channels for capacitive touch sensing without external components. At the architectural level, the SAM L21 integrates the Cortex-M0+ core with a high-speed bus matrix and a separate low-power peripheral bus, allowing DMA transfers to occur while the CPU sleeps. The Event System (EVSYS) enables peripherals to trigger each other without CPU intervention, further reducing active-mode energy consumption. The device is fabricated on a low-leakage CMOS process and supports SleepWalking, where peripherals wake the CPU only when data is ready. Typical applications include wearable fitness and health devices, smart home sensor nodes, low-power wireless IoT endpoints, industrial metering, battery-powered data loggers, and human-machine interfaces (HMI) with touch input. The wide operating voltage and ultra-low Sleep current also suit energy-harvesting designs where the average current must remain below 10 uA. Design consideration: when migrating firmware from the SAM D21 family (Cortex-M0+ at higher active current), use the SAM L21 Sleep modes aggressively - placing the CPU in Sleep between ADC samples can reduce average current by 50x or more. Use the brown-out detector (BOD) at 1.6V minimum and ensure decoupling capacitors (100 nF plus 4.7 uF bulk) are placed within 2 mm of the VDD pin. This page synthesizes distributor pricing, package-compatible alternatives, application circuits, and design notes that are not consolidated in the SAM L21 family datasheet, giving embedded engineers a single reference for part selection, supply-chain resilience, and low-power firmware design.

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ATSAML21G18B-MNT - ARM Cortex-M0+ MCU 256KB Flash 48MHz | Microchip
ATSAML21G18B-MNT

ATSAML21G18B-MNT - ARM Cortex-M0+ MCU 256KB Flash 48MHz | Microchip

The Microchip Technology ATSAML21G18B-MNT is an ARM Cortex-M0+ based ultra-low-power 32-bit microcontroller from the SAM L21 family, featuring 256KB of Flash, 40KB of SRAM, and a 48MHz maximum CPU clock, housed in a 48-pin QFN (7x7 mm) package. According to Microchip's SAM L21 Family datasheet, this Functional Safety (FuSa) variant is engineered for safety-critical applications and offers industry-leading power efficiency of under 35 uA/MHz in active mode and only 200 nA in Sleep mode. An ARM Cortex-M0+ microcontroller is a low-power 32-bit processor core designed for embedded systems that require deterministic real-time performance, low energy consumption, and a rich peripheral set at minimal cost. The Cortex-M0+ sits within the broader hierarchy of microcontroller -> embedded MCU -> system-on-chip (SoC) -> semiconductor, and the SAM L21 family specifically targets battery-powered and energy-harvesting applications where every microamp counts. Key features include six 16-bit timer/counters, a DMA controller for offloading CPU tasks, a 12-bit ADC with up to 20 channels, multiple SERCOM (SERial COMmunication) interfaces that can each be configured as UART, SPI, or I2C, and an on-chip temperature sensor. The integrated Serial Communication Interface (SERCOM) peripheral gives designers up to six independent configurable serial channels, a major architectural advantage over fixed-function UART/SPI/I2C peripherals. Technically, the SAM L21 implements Microchip's proprietary picoPower technology with multiple power domains, a Sleepwalking peripheral event system, and a backup domain that retains 32KB SRAM and the RTC while consuming roughly 200 nA. The device supports 1.6V to 3.6V supply operation, allowing direct connection to single-cell Li-ion or two AA cells. TrustZone-like memory protection and a deterministic interrupt controller (NVIC) make it suitable for IEC 61508 SIL2-capable functional safety systems. Typical applications include wearable fitness bands, smart sensor nodes, industrial IoT edge devices, battery-powered medical sensors, low-power wireless sensor networks, and safety-critical motor control. The combination of Cortex-M0+ compute performance and sub-200nA sleep current makes the ATSAML21G18B-MNT particularly strong in always-on edge nodes. When designing with this MCU, prioritize short wake-up routines and use Sleepwalking to keep the CPU off while peripherals monitor events. Plan PCB layout so that decoupling capacitors sit within 3 mm of VDD pins and the QFN exposed pad is soldered to a continuous ground plane for thermal dissipation. This page combines manufacturer datasheet specifications, current distributor pricing, drop-in alternatives within the SAM L21 family, and practical design notes not consolidated elsewhere, providing engineers with a single reference for component selection.

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ATSAML21J16B-AUT - 48MHz Cortex-M0+ MCU 64KB Flash | Microchip
ATSAML21J16B-AUT

ATSAML21J16B-AUT - 48MHz Cortex-M0+ MCU 64KB Flash | Microchip

The Microchip Technology ATSAML21J16B-AUT is a 32-bit ARM Cortex-M0+ ultra-low-power microcontroller from the SAM L21 family, featuring 64KB Flash and 8KB SRAM in a 64-pin TQFP (10x10 mm) package operating at up to 48MHz. The part belongs to the SAM L21J series, which targets energy-constrained battery-powered designs consuming under 35 µA/MHz in active mode and only 200nA in Sleep mode per the Microchip product page. The "AUT" suffix denotes TQFP64 package, tape-and-reel packaging, and the -40°C to +85°C industrial operating range. A microcontroller (MCU) is an integrated circuit that combines a CPU core, program memory, data RAM, and peripherals on a single silicon die. The ARM Cortex-M0+ is the smallest and most energy-efficient ARM processor core, optimized for deterministic embedded control with a minimal instruction set, while the SAM L21 family extends this with sophisticated power-domain gating. Within the broader hierarchy, this part sits at MCU -> 32-bit MCU -> Cortex-M0+ MCU -> Ultra-Low-Power MCU -> Power Management Aware MCU. Key features include the Cortex-M0+ core at 48MHz delivering 2.46 CoreMark/MHz, 64KB embedded Flash, 8KB SRAM, and an integrated full-speed USB 2.0 device with on-chip transceiver. The device also integrates a 12-bit 1MSPS ADC, multiple SERCOM peripherals configurable as UART/SPI/I2C, a 32-bit RTC, and a segmented LCD controller with up to 8x32 segments. The wide 1.62V to 3.63V supply range and on-chip DC-DC buck converter enable direct battery operation from a single 1.5V cell when boosted, or from a 3V coin cell. Typical applications include wearable fitness bands, medical sensor patches, smart remote controls, IoT sensor nodes, battery-powered metering, and human-machine interface panels with LCD readouts. The integrated LCD controller makes the SAM L21 especially attractive for industrial gauges and consumer devices that need a low-power alphanumeric or segment display alongside processing. When designing with this MCU, place a 1µF decoupling capacitor on each VDD pin and keep the 32.768kHz crystal traces short to minimize sleep-mode current. Use the SAM L21 sleepwalking peripheral to wake the CPU only on sensor thresholds, which is the key to achieving the 200nA sleep figure. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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ATSAML21J16B-MUT - 48MHz Cortex-M0+ 64KB Flash MCU | Microchip
ATSAML21J16B-MUT

ATSAML21J16B-MUT - 48MHz Cortex-M0+ 64KB Flash MCU | Microchip

The Microchip ATSAML21J16B-MUT is an ultra-low-power ARM Cortex-M0+ microcontroller in the SAM L21 family, operating at up to 48 MHz with 64 KB of Flash and 8 KB of SRAM in a 64-pin QFN (9x9 mm) package. It features an active-mode current under 35 uA/MHz and a Sleep-mode current of 200 nA, making it one of the lowest-power 32-bit Cortex-M0+ MCUs in its class. The device integrates sophisticated power-management technologies for battery-driven and energy-harvesting applications. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), working memory (SRAM), and programmable peripherals on one die. The Cortex-M0+ is an ARM 32-bit core optimized for minimum silicon area and energy consumption, while Thumb-2 instruction set compatibility gives it the code density of larger cores. The SAM L21 family extends this ultra-low-power positioning by adding Sleepwalking peripherals (SERCOM, ADC, PTC) that wake the CPU only on meaningful events, and by providing multiple low-power domains controlled via the Power Manager (PM) and Supply Controller (SUPC) blocks. Key features of the ATSAML21J16B-MUT include 64 KB Flash, 8 KB SRAM, up to 48 MHz operation (2.46 CoreMark/MHz), a 12-bit 1 Msps ADC, a 10-bit 350 ksps DAC, up to six SERCOM serial interfaces (configurable as I2C/SPI/UART/USART), a 64-pin QFN package with high pin count for I/O expansion, and integrated PTC touch-overlays support. The device also includes a full-speed USB 2.0 device/host interface in select package options and a flexible Event System for hardware-triggered peripheral interactions. Architecturally, the ATSAML21J16B-MUT separates logic into three power domains: Backup, Voltage Regulator, and Core. Each domain can be independently switched off by the SUPC, allowing the chip to enter BACKUP mode drawing only a few hundred nanoamps while preserving the RTC and selected I/O wake events. SERCOM modules can be runtime-reconfigured to any of UART, SPI, or I2C, simplifying BOM reuse across product variants. Typical applications include IoT sensor nodes, wearable health and fitness devices, smart-home and building-automation end nodes, low-power wireless-connected products (when paired with an external sub-GHz or BLE transceiver), battery-backed industrial data loggers, and human-machine interface (HMI) panels using capacitive touch. When designing with this device, plan the sleep/wake architecture first: route wake-up sources through the Event System to avoid CPU wake-ups on every interrupt. Use the integrated DC-DC converter (L21 has switched-mode regulation) when VDD > 1.8 V to maximize efficiency. This page synthesizes distributor pricing, same-family drop-in alternatives, application notes, and design considerations not found on the manufacturer datasheet alone, optimized for engineers selecting low-power Cortex-M0+ silicon for battery and energy-harvesting products.

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ATSAML21J17B-AUT - 48MHz ARM Cortex-M0+ MCU 128KB | Microchip
ATSAML21J17B-AUT

ATSAML21J17B-AUT - 48MHz ARM Cortex-M0+ MCU 128KB | Microchip

The Microchip Technology ATSAML21J17B-AUT is an ultra-low-power 32-bit ARM Cortex-M0+ microcontroller from the SAM L21 family, featuring 128KB of Flash and 16KB of SRAM in a 64-pin TQFP (10x10 mm) package. It operates at up to 48 MHz (2.46 CoreMark/MHz) across a 1.62V-3.6V supply range and is specified for the -40C to +85C industrial temperature range. This variant ships in Tape & Reel packaging. An ARM Cortex-M0+ microcontroller is a 32-bit RISC processor core optimized for energy-efficient embedded applications, sitting within the broader hierarchy of microcontroller -> embedded MCU -> semiconductor IC. The Cortex-M0+ is the smallest and most power-efficient of the ARM Cortex-M family, featuring a single-cycle I/O port, hardware single-cycle multiplication, and a tightly-coupled NVIC for deterministic interrupt response. The SAM L21 family extends this efficiency with proprietary picoPower technology that enables Sleep mode currents below 1 uA. Key features include under 35 uA/MHz active current consumption and 200 nA Sleep mode current (per Microchip family documentation), up to six SERCOM interfaces for UART/SPI/I2C, a 12-bit 1 Msps ADC, a 10-bit DAC, and full Functional Safety (FuSa) support for safety-critical applications. The device integrates a hardware segmented LCD controller with up to 8x32 segments, a USB 2.0 Full-Speed device interface, and a capacitive touch acquisition module (PTC). The architecture pairs the Cortex-M0+ core with a 2-layer AHB-Lite bus matrix, event system for peripheral-to-peripheral signaling without CPU intervention, and SleepWalking peripherals that wake the CPU only on qualified events. This combination enables always-on battery-powered designs that previously required an external ultra-low-power MCU. The integrated DC-DC buck converter and multiple low-power regulator modes further reduce system current at 1.8V VDDIO operation. Typical applications include battery-powered IoT sensor nodes, wearable health monitoring devices, smart meters, and home automation controllers. The functional safety features make it suitable for medical device peripherals and industrial sensor interfaces requiring IEC 61508 SIL 2 compliance. The wide operating voltage and low Sleep current also support energy-harvesting designs. When designing with this device, route the SWD pins (SWCLK/SWDIO) to a dedicated debug header or test pad cluster for production programming. Decouple VDDIN with a 1 uF X7R 0402 ceramic capacitor placed within 3 mm of the pin, and follow the Microchip SAM L21 hardware design checklist for the DC-DC inductor selection. This page synthesizes distributor pricing, drop-in alternatives within the SAM L21 family, and practical design notes not found in the manufacturer datasheet alone.

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ATSAML21J17B-MNT - 48MHz Cortex-M0+ MCU 128KB Flash | Microchip
ATSAML21J17B-MNT

ATSAML21J17B-MNT - 48MHz Cortex-M0+ MCU 128KB Flash | Microchip

The Microchip Technology ATSAML21J17B-MNT is an ultra-low-power 32-bit ARM Cortex-M0+ microcontroller in the SAM L21 family with 128KB Flash and 16KB SRAM in a 64-pin QFN (9x9 mm) package. Operating from 1.6V to 3.6V at up to 48MHz, it integrates Functional Safety (FuSa) features suitable for safety-critical and IEC 60730-class applications. Active-mode consumption is under 35 µA/MHz and Sleep mode drops to 200nA, making it one of the lowest-power Cortex-M0+ devices in its class. A microcontroller (MCU) is a single-chip computer that integrates a processor core, program and data memory, peripherals, and I/O into one package. The ATSAML21J17B-MNT belongs to the hierarchy: microcontroller -> embedded MCU -> 32-bit ARM MCU -> ultra-low-power Cortex-M0+ MCU. The SAM L21 family is a Cortex-M0+ line; Cortex-M0+ is a 32-bit ARM processor core optimised for energy efficiency, targeting battery-powered IoT, wearable, and sensor applications. Key features include 2.46 CoreMark/MHz, hardware multiplier, single-cycle I/O port access, a 12-bit 1 MSPS ADC, DAC, comparators, SERCOM configurable serial interfaces, and full-speed USB with internal 3.3V regulator. The device supports SleepWalking, multiple low-power modes, and a Segment LCD controller for direct glass drive, removing the need for an external LCD driver IC. AES, true random number generator (TRNG), and integrity check modules support cryptographic and tamper-detection use cases. The ATSAML21J17B-MNT uses a 32-bit ARM Cortex-M0+ core with two AHB-Lite bus masters and a peripheral event system for zero-latency task wake-up. Up to 24 channels of DMA offload the CPU; SERCOM peripherals can be mapped to most pins, simplifying PCB routing. The on-chip voltage regulator generates core logic from a single supply, while a separate RTC domain retains timekeeping down to 200nA. Typical applications include IoT sensor nodes, wearable health and fitness devices, smart meters, industrial HMI with LCD readout, remote controls, and battery-powered safety peripherals such as smoke detectors. The wide 1.6V-3.6V supply allows direct connection to single-cell Li-ion or two-AA chemistries without a boost converter. Designers should match the chosen package (64-QFN) against available PCB area and thermal budget. Unused pins should be left as no-connect or configured as output-low to minimise current draw. For functional-safety firmware, the on-chip self-test BIST libraries accelerate IEC 60730 / UL 60730 class B certification. The datasheet ordering code suffix -MNT denotes 64-QFN, tape-and-reel, -40C to +85C industrial temperature grade. This page combines distributor pricing, drop-in alternative MPNs, and practical design notes not found in the manufacturer datasheet alone.

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ATSAML21J17B-MUT - 48MHz Cortex-M0+ 128KB MCU | Microchip
ATSAML21J17B-MUT

ATSAML21J17B-MUT - 48MHz Cortex-M0+ 128KB MCU | Microchip

Microchip ATSAML21J17B-MUT is an ultra-low-power 32-bit ARM Cortex-M0+ microcontroller from the SAM L21 family, delivering up to 48 MHz CPU clock and 128 KB of Flash in a 64-pin QFN (9x9 mm) package. The device integrates Functional Safety (FuSa) features and consumes under 35 uA/MHz in active mode while dropping to 200 nA in Sleep mode, making it one of the lowest-power Cortex-M0+ MCUs in the industry. It operates from a wide 1.62V to 3.63V supply and reaches 2.46 CoreMark/MHz, enabling long battery life in IoT edge nodes. An ARM Cortex-M0+ microcontroller is a 32-bit RISC processor core based on the ARMv6-M architecture, designed for energy-efficient embedded applications. It belongs to the wider hierarchy microcontroller -> embedded MCU -> semiconductor IC, and uses the Thumb-2 instruction set to deliver high code density in compact firmware footprints. The SAM L21 family specifically targets ultra-low-power designs where Sleep-mode current dominates the energy budget of battery-powered sensor nodes. Key features include 128 KB Flash, 16 KB SRAM, a 12-bit 1 Msps ADC, two analog comparators, a 32-bit RTC, SERCOM serial interfaces, and hardware crypto support via the on-chip PAC and TRNG peripherals. The device supports SleepWalking, idle, standby, backup, and off modes, allowing peripherals to operate independently while the CPU is asleep. Integrated op-amps and DAC channels support sensor-conditioning tasks without external components. The SAM L21 family shares a linear address map, hex-compatible code, and pin-compatible migration paths across 32, 48, and 64-pin packages, simplifying firmware reuse between ATSAML21E/G/J variants. The Microchip SAM L21 datasheet documents the complete peripheral set and clock tree topology used in low-power IoT designs. Typical applications include battery-powered IoT sensor nodes, wearable fitness bands, smart home edge devices, predictive-maintenance sensor hubs, and industrial metering. The 200 nA Sleep mode makes it ideal for energy-harvesting designs where average current draw must remain in the single-digit microamp range. When designing with this device, prioritize Sleep mode selection and use the Event System to wake peripherals without CPU involvement. Carefully size decoupling capacitors near each VDD pin and follow the SAM L21 hardware design checklist for EMI and brown-out performance. This page consolidates distributor pricing, drop-in alternative parts, and engineering design notes not found in the manufacturer datasheet, giving buyers and engineers a faster decision-making path.

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ATSAML21J17B-UUT - 128KB Flash 48MHz ARM Cortex-M0+ MCU | Microchip
ATSAML21J17B-UUT

ATSAML21J17B-UUT - 128KB Flash 48MHz ARM Cortex-M0+ MCU | Microchip

The Microchip Technology ATSAML21J17B-UUT is an ultra-low-power 32-bit ARM Cortex-M0+ flash microcontroller from the SAM L21J family, featuring 128 KB of Flash and 16 KB of SRAM in a 64-ball WLCSP package (3.58 x 3.28 mm). It operates from a 1.6 V to 3.6 V supply, runs at up to 48 MHz, and is rated for the industrial temperature range of -40C to +85C. According to the Mouser listing and the SAM L21 Family Data Sheet, this device consumes under 35 uA/MHz in active mode and only 200 nA in Sleep mode, making it one of the most energy-efficient Cortex-M0+ MCUs in its class. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), working memory (SRAM), and a rich set of peripherals. The ARM Cortex-M0+ is the smallest and most energy-efficient core in the Cortex-M family, optimized for low-power deterministic embedded control. Within Microchip's portfolio, this device sits in the hierarchy: Cortex-M0+ core -> ARM 32-bit MCU -> SAM L21 ultra-low-power family -> Functional Safety (FuSa) product line -> embedded microcontroller. Its combination of Cortex-M0+ simplicity with SleepWalking, power domain gating, and ultra-low-power peripherals targets always-on, battery-powered applications. Key features of the ATSAML21J17B-UUT include 128 KB Flash, 16 KB SRAM, an ARM Cortex-M0+ core at 48 MHz (2.46 CoreMark/MHz), full-speed USB device support, a 12-bit 1 Msps ADC, up to five SERCOM channels, a 32-bit RTC, and PTC (Peripheral Touch Controller) for capacitive touch sensing. The WLCSP64 package enables compact PCB designs, while the integrated power management supports SleepWalking, deep sleep, backup, and standby modes. Functional Safety (FuSa) features assist in safety-critical designs. Architecturally, the SAM L21 family uses a sophisticated power-domain gating scheme that selectively powers only the peripherals in use. This, combined with the Cortex-M0+ two-stage pipeline and the Wake-on-event interrupt controller, minimizes wake-up latency while keeping idle current at 200 nA. The integrated 12-bit DAC, multiple timer/counter channels, and event system allow complex signal routing without CPU intervention. Typical applications include wearable fitness and health devices, battery-powered IoT sensors, smart metering, home automation, remote controls, and ultra-low-power wireless sensor nodes. It is also used in industrial IoT edge nodes where long battery life and a small footprint (WLCSP64) are both essential. When designing with this MCU, designers should pay attention to decoupling (place 100 nF X7R capacitors near each VDD pin), I/O bank voltage reference requirements for analog accuracy, and the need to configure unused pins as outputs with defined levels to minimize leakage. The WLCSP package also demands careful PCB pad design and assembly process control. This page synthesizes distributor pricing, drop-in alternatives drawn from the same SAM L21 family, and practical design notes not found in the manufacturer datasheet, providing engineers a one-stop reference for sourcing the ATSAML21J17B-UUT.

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ATSAML21J18A-MUT - 48MHz Cortex-M0+ MCU, 256KB Flash | Microchip
ATSAML21J18A-MUT

ATSAML21J18A-MUT - 48MHz Cortex-M0+ MCU, 256KB Flash | Microchip

The Microchip Technology ATSAML21J18A-MUT is an ultra-low-power 32-bit ARM Cortex-M0+ microcontroller running at up to 48 MHz, integrating 256 KB of Flash and 32 KB of SRAM in a 64-pin QFN (9x9 mm) package with an exposed pad for thermal dissipation. The part is part of the SAM L21 family, Microchip's lowest-power Cortex-M0+ line featuring an on-chip Cortex-M0+ core, single-cycle hardware multiplier, and Micro Trace Buffer for instruction trace. What is a Cortex-M0+ microcontroller? A Cortex-M0+ microcontroller is an ARM Holdings 32-bit microcontroller core optimized for the smallest die area and lowest active power, using a 2-stage pipeline and single-cycle I/O port access. Within the hierarchy, the Cortex-M0+ belongs to the ARM Cortex-M family, itself a subset of the ARMv6-M architecture, and the SAM L21 family is Microchip's ultra-low-power derivative. This places the ATSAML21J18A-MUT in the broad category: microcontroller (MCU) -> 32-bit MCU -> ARM Cortex-M MCU -> ultra-low-power MCU -> semiconductor IC. Key differentiating features include 1.6V to 3.6V supply voltage, integrated full-speed USB 2.0 device with on-chip transceiver, 12-bit 1 MSPS ADC, 10-bit 350 kSPS DAC, four SERCOM channels, six timers, two I2S interfaces, and a PTC (Peripheral Touch Controller) for capacitive touch sensing. The device operates in active, idle, standby, backup, and off sleep modes with wakeup times under 1.5 microseconds, making it ideal for battery-powered applications where microamp sleep currents dominate battery life. Architecturally, the SAM L21 uses a power-efficient design with separate voltage domains for core and I/O, allowing the I/O bank to remain active while the core is in standby. This dual-bank approach, combined with Microchip's proprietary power-management IP, delivers 35 uA/MHz active current and standby currents around 1.7 uA with full RAM retention, which is competitive in the ultra-low-power MCU class. Typical applications include battery-powered IoT sensor nodes, wearable fitness bands, smart-home sensor hubs, low-power wireless sensor networks, and capacitive touch human-machine interfaces. Industrial uses include metering, building automation, and remote controls; consumer uses include toys, gaming peripherals, and personal health devices. Design consideration: when migrating from a SAM D21 part, note that the SAM L21 uses the same SERCOM peripheral but adds a low-power backup domain and a touch controller not present on the SAM D21. Firmware may need to enable the backup domain registers before using RTC or wake-on-touch features. This page consolidates distributor pricing, drop-in alternatives within the SAM L21 family and across the SAM D21 family, and practical low-power design notes beyond the manufacturer datasheet.

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ATSAML21J18B-AUT - 48MHz Cortex-M0+ MCU 256KB Flash | Microchip
ATSAML21J18B-AUT

ATSAML21J18B-AUT - 48MHz Cortex-M0+ MCU 256KB Flash | Microchip

The Microchip Technology ATSAML21J18B-AUT is an ultra-low-power 32-bit ARM Cortex-M0+ microcontroller from the SAM L21J family with Functional Safety (FuSa) capability, integrating 256KB of Flash and 32KB (reported as up to 40KB on some distributor pages) of SRAM, operating at up to 48MHz, and housed in a 64-pin TQFP (10x10 mm) package. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), data memory (SRAM), and programmable peripherals into one IC. The Cortex-M0+ is ARM's smallest and most energy-efficient core, optimized for embedded applications that demand deterministic real-time behavior at very low active and sleep currents. Ultra-low-power MCUs sit in the broader hierarchy of embedded microcontrollers, which in turn belong to the wider family of microprocessors and digital semiconductors. Key features include a 48MHz maximum CPU clock, 256KB program Flash, 32KB SRAM, an on-chip full-speed USB 2.0 device interface, multiple SERCOM serial interfaces, a 12-bit ADC, a 10-bit DAC, and integrated touch hardware (PTC). The SAM L21 family is engineered for ultra-low-power operation, drawing under 35 uA/MHz in active mode and approximately 200nA in Sleep mode, with multiple SleepWalking-enabled peripherals that allow autonomous wake-up based on sensor events without CPU intervention. The device supports a 1.62V to 3.63V supply range. Architecturally, the ATSAML21J18B uses the Cortex-M0+ core with a single-cycle I/O port and a low-power 32.768kHz oscillator supporting RTC, brown-out detector, and supply voltage monitoring. The Functional Safety (FuSa) variant includes additional safety documentation, failure-mode analysis, and diagnostics for IEC 60730 class B safety compliance in home appliances and similar end products. The 64-pin TQFP footprint exposes 51 GPIO lines alongside USB, SERCOM, ADC, DAC, and analog comparator peripherals. Typical applications include battery-powered IoT sensor nodes, smart home appliances, wearable health and fitness devices, industrial sensor transmitters, building automation controllers, and consumer electronics requiring Functional Safety class B compliance. The combination of USB device, deep-sleep current below 1uA, and a touch peripheral makes it suitable for HMI front panels that must run for years on a single battery. When designing with this part, place a 100nF decoupling capacitor within 3mm of each VDD pin and a 4.7uF bulk capacitor near the device. Configure unused pins as inputs with pull-downs to minimize leakage, and use the SleepWalking peripheral event system to keep the CPU in deep sleep until a sensor threshold is crossed. This page synthesizes distributor pricing, drop-in same-family SAM L21 and SAM D21 alternatives, and practical low-power design guidance not aggregated on a single manufacturer page.

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ATSAML21J18B-MUT - SAM L21 Cortex-M0+ 256KB Flash 48MHz QFN-64 MCU | Microchip
ATSAML21J18B-MUT

ATSAML21J18B-MUT - SAM L21 Cortex-M0+ 256KB Flash 48MHz QFN-64 MCU | Microchip

The Microchip Technology ATSAML21J18B-MUT is an ultra-low-power 32-bit ARM Cortex-M0+ Flash microcontroller (MCU) from the SAM L21J Functional Safety (FuSa) family, integrating 256KB (256K x 8) Flash, 32KB SRAM, and a 48 MHz CPU core in a 64-pin QFN (9x9 mm) package supplied on tape and reel. A microcontroller (MCU) is a single-chip computer that combines a CPU core, volatile memory (SRAM), non-volatile memory (Flash), and a rich set of peripherals such as timers, communication interfaces, and analog blocks. Within the broader semiconductor taxonomy, an MCU belongs to the hierarchy integrated circuit -> microprocessor/microcontroller -> embedded controller. The Cortex-M0+ is ARM's most energy-efficient core and is widely adopted for battery-powered and cost-sensitive embedded designs. Key features include less than 35 uA/MHz active-mode current consumption, 200 nA Sleep-mode current, an integrated 12-bit ADC and DAC, multiple SERCOM configurable serial interfaces, an 8-channel event system, and Functional Safety features targeting IEC 60730 class B compliance for home appliances and similar regulated end products. The 64-QFN (9x9 mm) package includes an exposed thermal pad that provides both a low-impedance ground reference and a thermal dissipation path. Architecturally, the ATSAML21J18B-MUT uses the Cortex-M0+ core with single-cycle I/O access, SleepWalking peripherals, power-domain gating, and a sophisticated Power Manager with multiple low-power modes (Idle, Standby, Backup, and Off). It also includes a 32.768 kHz RTC oscillator domain and a high-accuracy internal 8 MHz/12 MHz/16 MHz RC oscillator with PLL options. Typical applications include IoT sensor nodes, wearable fitness and health devices, smart home appliances, industrial sensor hubs, low-power wireless modules, and battery-powered metering systems where extended battery life and functional safety are both required. When designing with this part, select a 32.768 kHz crystal for accurate RTC timekeeping and use the SERCOM pin-mux flexibility to map your preferred peripherals onto almost any GPIO. The 64-QFN exposed pad must be soldered to a sufficient copper area for thermal and electrical performance, and decoupling capacitors must be placed as close as possible to the supply pins. This page synthesizes distributor pricing, drop-in alternatives, application circuits, and practical design notes not found in the manufacturer datasheet, providing a one-stop engineering reference for selecting or replacing the ATSAML21J18B-MUT in new and existing designs.

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ATSAML21J18B-UUT - 256KB Flash Cortex-M0+ MCU | Microchip
ATSAML21J18B-UUT

ATSAML21J18B-UUT - 256KB Flash Cortex-M0+ MCU | Microchip

The Microchip ATSAML21J18B-UUT is an ultra-low-power 32-bit ARM Cortex-M0+ flash microcontroller operating up to 48 MHz, delivering 2.46 CoreMark/MHz while consuming under 35 uA/MHz in active mode and only 200 nA in Sleep mode. It integrates 256 KB of Flash and 40 KB of SRAM in a 64-ball WLCSP package, and operates from a 1.6 V to 3.6 V supply across the industrial temperature range of -40C to +85C. According to the Microchip SAM L21 family datasheet, the device is the highest-density variant of the SAM L21J WLCSP64 line and provides sophisticated power management through power domain gating, SleepWalking, and ultra-low-power peripherals. A microcontroller (MCU) is an integrated circuit containing a processor core, program and data memory, and programmable peripherals. ARM Cortex-M0+ cores target the lowest active power and smallest die area among the Cortex-M family, making them ideal for battery-powered embedded systems. Within that hierarchy the SAM L21 sits in Microchip's ultra-low-power tier alongside the SAM L11 secure family and the SAM D20/D21 mainstream tier, all built around the same ARM Cortex-M0+ instruction set. This particular J18B-UUT part is the WLCSP64 package variant - WLCSP (Wafer Level Chip Scale Package) is the smallest-footprint option of the SAM L21J family and is intended for space-constrained wearables and sensor nodes. Key features include a 12-bit 1 MSPS ADC, a 10-bit DAC, four SERCOM channels that can each be configured as USART, I2C, or SPI, and a 32-bit RTC with calendar mode. Power management is the central design pillar: SleepWalking lets peripherals wake the CPU only when relevant events occur, while six flexible power domains allow unused logic to be powered down at run time. The 64-ball WLCSP package has a footprint of approximately 3.0 x 3.0 mm and a height under 0.5 mm, allowing direct attachment to a top-side PCB layer with minimal inductance. The architecture pairs the Cortex-M0+ core with a 4-channel event system and a Peripheral Touch Controller (PTC) supporting capacitive touch sensing. The 12-bit ADC achieves up to 1 MSPS at full resolution and 2 MSPS at 8-bit resolution, providing enough bandwidth for sensor fusion and audio preprocessing. A hardware cryptographic module is not present on this family - it is delegated to the SAM L11 tier - so security-sensitive designs should add an external secure element. Typical applications include battery-powered IoT sensor nodes, wearable fitness and health devices, smart metering, home automation endpoints, and industrial wireless sensor transmitters. The combination of Cortex-M0+ performance, 256 KB of Flash for application code, and SleepWalking peripheral architecture keeps the average system current below 1 mA in many typical duty-cycled scenarios. When designing with this device, prioritize sleep-mode current draw as your primary figure of merit; idle power dominates battery life more than active throughput. The WLCSP64 footprint requires PCB pad design rules substantially different from QFP or QFN packages - the recommendation is non-solder-mask-defined (NSMD) pads with a diameter roughly 0.4 mm and a pitch matching the package balls. Reference the Microchip SAM L21 WLCSP64 land pattern application note for exact stack-up recommendations. This page synthesizes distributor pricing, drop-in compatible alternatives from Microchip's SAM L21 family, and practical PCB/thermal design notes that are not collected in the manufacturer datasheet.

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ATSAML22G16A-AUT - SAM L22G 32MHz Cortex-M0+ 64KB MCU | Microchip
ATSAML22G16A-AUT

ATSAML22G16A-AUT - SAM L22G 32MHz Cortex-M0+ 64KB MCU | Microchip

The Microchip Technology ATSAML22G16A-AUT is an ultra-low-power 32-bit ARM Cortex-M0+ microcontroller from the SAM L22G family, featuring 64KB of Flash, 8KB of SRAM, and a 32MHz maximum CPU clock, housed in a 48-pin TQFP (7x7 mm) package. It is designed for battery-powered and energy-harvesting applications where active-mode efficiency and deep-sleep current are critical design constraints. An ultra-low-power microcontroller (MCU) is a class of embedded processor that combines a CPU core, non-volatile memory (Flash), volatile memory (SRAM), and a rich set of peripherals into a single IC, optimized to minimize energy consumption across active, idle, and sleep states. The Cortex-M0+ is ARM's smallest and most energy-efficient application processor core, and the SAM L22 family extends this efficiency with Microchip's proprietary power-management techniques. Within the broader taxonomy, this device is a 32-bit microcontroller, a sub-category of microcontrollers and embedded processors, falling under the Integrated Circuits > Microcontrollers category. Key features include a Cortex-M0+ core running up to 32MHz, 64KB Flash for application code, 8KB SRAM for runtime data, an integrated 32kHz RTC and Segment LCD controller, and a wide operating voltage range of 1.62V to 3.63V. The device operates at 39 uA/MHz in active mode running CoreMark, and drops to as low as 490nA in ultra-low-power backup mode with RTC retention. It supports multiple low-power modes including Sleep, Standby, Backup, and Off, and provides a Segment LCD driver for glass displays up to 8 common segments. The SAM L22 architecture combines an efficient ARM Cortex-M0+ pipeline with Microchip's Peripheral Event System and Sleepwalking peripherals, allowing the CPU to remain asleep while DMA-driven events handle sensor sampling and GPIO wakeups. An integrated 32kHz oscillator, full-speed USB 2.0 device, and Segment LCD controller further reduce external component count. The 48-pin TQFP package exposes multiple SERCOM, ADC, and touch-capable I/O lines, supporting a wide range of mixed-signal interfaces. Typical applications include battery-powered sensor nodes, wearable health and fitness devices, smart thermostats and home automation, industrial IoT edge nodes, metering and instrumentation displays with built-in LCD support, and ultra-low-power wireless sensor end-nodes. The integrated Segment LCD controller makes it particularly well suited to products with a user-facing glass display that must run for years on a single coin cell. When designing with this device, ensure that the supply rail is decoupled with at least one 100nF ceramic capacitor placed within a few millimetres of the VDD pins, and that the Segment LCD bias network is sized per the display manufacturer's recommended glass capacitance. Designers should evaluate the trade-off between using the integrated 32kHz crystal oscillator versus an external 32.768kHz crystal when RTC accuracy is critical to the application. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, organized to support component selection, PCB layout, and supply-chain risk analysis for engineers working on low-power embedded designs.

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ATSAML22G16A-MUT - 32MHz Cortex-M0+ MCU 64KB Flash | Microchip
ATSAML22G16A-MUT

ATSAML22G16A-MUT - 32MHz Cortex-M0+ MCU 64KB Flash | Microchip

The Microchip Technology ATSAML22G16A-MUT is an ultra-low-power 32-bit ARM Cortex-M0+ microcontroller from the SAM L22 family, featuring 64KB of Flash and 8KB of SRAM in a 48-pin QFN (7x7 mm) package with an exposed pad for thermal dissipation. It operates from 1.6V to 3.6V with a 32MHz maximum CPU clock, integrates an AES 256-bit crypto engine, and delivers 39 µA/MHz active current with CoreMark benchmarking while dropping to 490 nA in ultra-low-power backup mode with RTC retention. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, memory, and programmable peripherals. The SAM L22 family sits in Microchip's ultra-low-power MCU portfolio, optimized for battery-powered and energy-harvesting applications. The Cortex-M0+ core is the smallest and most energy-efficient ARM core, making it the right choice when deterministic real-time response and long battery life outweigh raw computational throughput. The SAM L22 belongs to the power management MCU segment, sitting hierarchically between 8-bit MCUs (e.g., PIC16) and higher-end Cortex-M4/M7 families (e.g., SAME70). Key features include segmented LCD support (up to 8x40 segments with on-chip charge pump), a 12-bit ADC with oversampling, multiple SERCOM interfaces configurable as UART/SPI/I2C, a full-speed USB 2.0 device/host with embedded PHY, an ISO 7816 smart-card interface, and an integrated PTC (Peripheral Touch Controller) for capacitive touch sensing. The device is AEC-Q100 qualified, making it automotive-ready. Architecturally, the SAM L22 uses an event-driven SERCOM system and SleepWalking peripherals that allow the CPU to remain in deep sleep until a peripheral triggers an interrupt, dramatically reducing system-level power. The 39 µA/MHz active figure and 490 nA backup figure are enabled by dedicated low-power voltage regulators and an ultra-low-power RTC on a separate power domain. Typical applications include IoT sensor nodes, smart metering, wearable fitness bands, electronic shelf labels, industrial HMI with LCD, automotive body controllers, and battery-powered medical devices such as glucose meters. Designers should consider this MCU when sub-1 µA standby current and segment-LCD support are required without moving to a Cortex-M4 class device. This page consolidates distributor pricing, drop-in package alternatives, and practical design notes not found in the manufacturer datasheet alone.

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ATSAML22G17A-AUT - ARM Cortex-M0+ 32MHz 128KB MCU | Microchip
ATSAML22G17A-AUT

ATSAML22G17A-AUT - ARM Cortex-M0+ 32MHz 128KB MCU | Microchip

The Microchip Technology ATSAML22G17A-AUT is an ultra-low-power 32-bit ARM Cortex-M0+ Flash microcontroller (MCU) from the SAM L22 family, integrating 128KB of Flash and 16KB of SRAM, and housed in a 48-pin TQFP (7x7 mm) package rated for industrial temperature operation. It operates from a wide 1.62V to 3.6V supply and runs the Cortex-M0+ core at up to 32 MHz, achieving 2.46 CoreMark/MHz while consuming only 39 uA/MHz in active mode. What is an ARM Cortex-M0+ microcontroller? The Cortex-M0+ is ARM's smallest and most energy-efficient application processor core, designed for deeply embedded applications that demand deterministic real-time behaviour, low power, and minimal silicon cost. It belongs to the broader category of microcontrollers (MCU), which themselves are single-chip computers containing CPU, memory, and peripherals. The SAM L22 family specifically targets ultra-low-power IoT and battery-backed sensor applications by adding sophisticated power domains such as Backup mode (490 nA with RTC running), a separate RTC domain, and on-chip segmented LCD support. Key features include 128KB Flash, 16KB SRAM, a 12-bit 1 Msps ADC, a 16-bit Sigma-Delta ADC, up to 36 GPIO, segment LCD controller, multiple SERCOM (UART/SPI/I2C) interfaces, a full-speed USB device with embedded transceiver, hardware AES, capacitive touch (PTC) peripheral, and a Real-Time Clock with calendar. Industrial-grade operating range of -40C to +85C is provided by the AUT suffix. The integrated segment LCD controller and PTC make it differentiated from generic Cortex-M0+ parts by supporting human-machine interfaces and touch UI on a single chip. Architecture-wise, the SAM L22G uses a Harvard-bus Cortex-M0+ core with a single-cycle hardware multiplier, NVIC with 4 priority levels, and Microchip's Event System for inter-peripheral signalling without CPU intervention. Advanced power management is provided through Sleep, Idle, Standby, and Backup modes, with the Backup mode consuming only 490 nA while retaining 8KB of backup SRAM and the RTC. A built-in 32 kHz crystal oscillator and 8 MHz DFLL allow precise low-jitter clocking for sensor and metering applications. Typical applications include ultra-low-power IoT sensor nodes, battery-operated medical wearables, smart utility meters with segment LCD, capacitive touch human-machine interfaces, USB peripherals, industrial sensor transmitters, and remote controls. When designing with this MCU, prioritize using Backup mode with RTC wake for battery life optimization, and ensure that the LCD bias generation capacitors and segment pin assignments match the target glass to avoid ghosting artifacts.

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ATSAML22G17A-MUT - 32MHz Cortex-M0+ MCU 128KB Flash | Microchip
ATSAML22G17A-MUT

ATSAML22G17A-MUT - 32MHz Cortex-M0+ MCU 128KB Flash | Microchip

The Microchip Technology ATSAML22G17A-MUT is an ultra-low-power 32-bit ARM Cortex-M0+ microcontroller (MCU) from the SAM L22 family, featuring 128KB of Flash and 16KB of SRAM in a 48-pin QFN (7x7) package. It operates from a 1.6V to 3.6V supply at a 32MHz CPU clock and integrates Full-Speed USB, a segment LCD controller, and multiple low-power modes that drop active consumption to 39 uA/MHz (CoreMark) and standby consumption to 490 nA in ultra-low-power backup mode with RTC retention. An ARM Cortex-M0+ microcontroller is a 32-bit RISC processor core designed by Arm that delivers higher code density and energy efficiency than 8/16-bit cores while maintaining a low gate count. It sits within the broader hierarchy of microcontroller -> embedded processor -> SoC -> semiconductor. Microchip's SAM L22 family targets battery-powered and energy-harvesting applications by combining a Cortex-M0+ core with sophisticated power management technologies, on-chip peripherals, and segment LCD driving capability. Key features include the Cortex-M0+ core with single-cycle hardware multiply, 128KB Flash, 16KB SRAM, a 12-bit ADC, multiple SERCOM interfaces configurable as UART/SPI/I2C, Full-Speed USB 2.0 with device and host modes, a segment LCD controller (up to 4x40 segments), and an Event System for peripheral-to-peripheral signalling without CPU involvement. The 48-QFN package integrates an exposed pad for improved thermal dissipation and board-level grounding. The SAM L22 architecture pairs the Cortex-M0+ core with a low-leakage process technology and a dedicated SleepWalking peripheral set. Power domains can be gated independently so SERCOM, ADC, or timer activity does not wake the CPU unless required. This makes the device well-suited for always-on sensor reading, smart-metering, and wearable designs that demand years of battery life. Typical applications include battery-powered IoT sensor nodes, smart thermostats and metering devices, wearable health monitors, remote controls, segment-LCD user-interface panels, USB peripherals, and industrial sensor hubs. The integrated segment-LCD controller eliminates an external driver IC, reducing both BOM cost and PCB area for any product that needs a numeric or alphanumeric display. When designing with this device, plan power-rail sequencing carefully because the SAM L22 has separate AVDD/VDDIO/VDDIN rails. Use a 1uF X7R ceramic decoupling capacitor on each supply pin placed as close to the IC as possible, and provide a USB- compliant 1uF capacitor on VBUS when the USB peripheral is used. Refer to Microchip application notes for low-power firmware patterns and segment-LCD bias generation. This page synthesizes distributor pricing from DigiKey and Mouser, drop-in alternatives from the SAM L22 family and the Sitel MPN cross-reference, and practical design notes that go beyond what is printed in the manufacturer datasheet.

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ATSAML22G18A-AUT - 32MHz Cortex-M0+ MCU 256KB Flash | Microchip
ATSAML22G18A-AUT

ATSAML22G18A-AUT - 32MHz Cortex-M0+ MCU 256KB Flash | Microchip

The Microchip Technology (formerly Atmel) ATSAML22G18A-AUT is an ultra-low-power ARM Cortex-M0+ flash microcontroller (MCU) in the SAM L22G family, featuring 256KB of Flash and 32KB of SRAM in a 48-pin TQFP (7x7 mm) package rated for the automotive -40C to +85C temperature range. It integrates a 32-bit Cortex-M0+ core running up to 32 MHz, sophisticated power management that consumes 39 uA/MHz in active CoreMark mode and drops to 490 nA in ultra-low-power backup mode with RTC retention. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), working memory (SRAM), and a rich set of peripherals into one device. Within the broader semiconductor taxonomy, the ATSAML22G18A-AUT belongs to the hierarchy: microcontroller -> embedded MCU -> ARM Cortex-M microcontroller -> ultra-low-power MCU -> 32-bit Cortex-M0+ MCU. It is part of Microchip's SAM L family, which is optimized for battery-powered IoT, wearable, and energy-harvesting designs where every microamp matters. Key differentiating features include Segment LCD support (up to 8x40 segments), a 12-bit 1 Msps ADC, two I2C, up to six SERCOM-configurable serial interfaces, a Full-Speed USB 2.0 device port, and a parallel crypto accelerator supporting AES, SHA, and True Random Number Generator. The device also includes a high-precision 32.768 kHz RTC reference, multiple low-power modes (Idle, Standby, Backup, Off), and Event System for inter-peripheral signaling without CPU intervention. The ATSAML22G18A-AUT is manufactured on a low-leakage CMOS process and uses Microchip's proprietary picoPower technology for active and sleep power reduction. Compared to general-purpose Cortex-M0+ MCUs, the SAM L22G adds integrated LCD drivers, hardware crypto, and USB FS, allowing a single chip to drive displays, secure communications, and PC connectivity in space-constrained designs. Typical applications include battery-powered IoT sensor nodes, wearable fitness and medical monitors, smart energy meters with LCD readouts, electronic shelf labels, home automation gateways, industrial HMI with segment LCDs, and automotive body controllers operating within the -40C to +85C range. Designers choose this part when they need a balance of low active current, deep-sleep nanoampere backup modes, integrated LCD, and AEC-Q100-friendly temperature tolerance. When designing with the ATSAML22G18A-AUT, ensure that the LDO/BUCK regulator pins are properly bypassed with 100 nF + 4.7 uF ceramic capacitors as shown in the reference design, and that the Segment LCD bias network uses Microchip's recommended charge-pump capacitor values. The Backup domain requires a 32.768 kHz crystal or external clock source for RTC operation, and the AES/SHA hardware crypto key storage should be locked via the BKUPCFG register before deployment.

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ATSAML22G18A-MUT - 32MHz ARM Cortex-M0+ 256KB MCU | Microchip
ATSAML22G18A-MUT

ATSAML22G18A-MUT - 32MHz ARM Cortex-M0+ 256KB MCU | Microchip

The Microchip Technology (formerly Atmel) ATSAML22G18A-MUT is an ultra-low-power 32-bit ARM Cortex-M0+ microcontroller delivering 32MHz CPU performance with 256KB Flash and 32KB SRAM in a 48-pin VQFN-EP (7x7 mm) package. As part of the SAM L22G family, it integrates an on-chip segment LCD controller with up to 8x32 segments, making it purpose-built for battery-powered metering, wearable, and segment-LCD display applications. What is a SAM L22 microcontroller? The SAM L22 family sits within Microchip's broader SAM lineup of 32-bit ARM Cortex microcontrollers. A microcontroller (MCU) is a single-chip computer integrating a CPU core, Flash program memory, SRAM data memory, and programmable peripherals. The L22 sub-family is differentiated by its ultra-low-power architecture, segment LCD driver, and Cortex-M0+ efficiency - aimed at deeply embedded applications that must run for years on a single coin cell. In the system hierarchy it occupies the power-management-aware edge of the IoT device spectrum: MCU -> ultra-low-power MCU -> segment LCD MCU -> SAM L22 family. Key differentiating specifications include 39 uA/MHz active current running CoreMark, 490 nA ultra-low-power backup mode with RTC retention, integrated 16-channel 12-bit ADC, four SERCOM interfaces (configurable as I2C/SPI/UART), full-speed USB device with internal pull-up, and a segment LCD controller supporting up to 8x32 segments. The Cortex-M0+ core delivers 0.9 DMIPS/MHz with single-cycle I/O access and an MPU for memory protection. Architecturally, the device uses a Harvard-style bus matrix with separate AHB/APB domains, SleepWalking peripherals that wake only on configured events, and event system for zero-CPU peripheral-to-peripheral signaling. The 32MHz operation is sourced from an internal 32.768kHz oscillator and PLL, eliminating external crystals in many designs. Operating voltage spans 1.6V to 3.6V across -40C to +85C industrial range. Typical applications include battery-powered flow and gas meters, wearable health monitors with segment LCD displays, smart thermostats, electronic shelf labels, IoT sensor nodes with USB diagnostic port, and industrial HMI panels. The on-chip LCD driver eliminates the need for an external segment-driver IC. When designing with this part, route the segment LCD pins as a dedicated bus to minimize crosstalk, place the decoupling capacitor within 2mm of VDDIN, and verify the backup domain RTC crystal load capacitance to achieve the 490 nA standby target. The page synthesizes distributor pricing, drop-in alternatives from the SAM L22 family, and practical design notes not found in the manufacturer datasheet.

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