USB to Serial Port Chip CH9101 CH9101N is a high-speed USB-to-UART bridge IC developed by WCH (Qinheng Electronics). It converts a USB 2.0 Full-Speed interface into a standard asynchronous UART serial interface, enabling seamless communication between a computer and microcontrollers, embedded systems, industrial equipment, and other UART-based devices. The device features an integrated clock oscillator and power-on reset circuitry, minimizing external components and simplifying PCB design. Housed in a compact SOP-8 package, the CH9101N supports UART logic voltages from 1.8 V to 5 V, making it suitable for a wide range of low-power and mixed-voltage applications. It is commonly used for USB debugging, firmware downloading, serial communication, and IoT development. Key Features USB 2.0 Full-Speed compliant device interface USB-to-UART bridge with baud rates up to 3 Mbps Supports 1.8 V, 2.5 V, 3.3 V, and 5 V UART I/O levels Integrated clock oscillator (no external crystal required) Built-in power-on reset circuitry Full-duplex UART communication Supports hardware flow control (RTS/CTS) Compatible with standard virtual COM port (VCP) drivers Compact SOP-8 package with minimal external components Suitable for MCU programming, debugging, and serial communication applications #CH9101N #WCH #USBtoUART #USBBridge #UART #USB20 #SerialCommunication #EmbeddedSystems #Microcontroller #IoT #IndustrialAutomation #Debugging #FirmwareDownload #SOP8 #InterfaceIC

Air Quality Sensor CO2 Sensor 2.5V/3.3V/5V 20-Pin SMD EP T/R The SCD41-D-R1 is a miniature photoacoustic carbon dioxide sensor module developed by Sensirion for high-accuracy environmental sensing applications. The device integrates a CO₂ sensing element, temperature sensor, humidity sensor, optical components, calibration memory, and digital signal processing into a compact surface-mount package suitable for embedded systems and portable electronics. The sensor utilizes photoacoustic sensing technology to provide precise carbon dioxide concentration measurements while maintaining low power consumption and long-term stability. Integrated humidity and temperature sensing capabilities enable environmental compensation and simplify system integration by reducing the need for external sensors. The SCD41 communicates through a standard I²C digital interface and supports automatic self-calibration functions for reliable long-term operation. Its compact footprint and low energy requirements make it suitable for battery-powered devices, smart building systems, HVAC equipment, indoor air quality monitoring systems, and IoT applications. The module is factory calibrated and designed for continuous monitoring of indoor air quality conditions. The integrated architecture minimizes external component requirements while enabling accurate sensing performance across a wide operating range. Key Features Photoacoustic CO₂ sensing technology Integrated temperature and humidity sensing High accuracy carbon dioxide measurement I²C digital communication interface Low power consumption operation Automatic self-calibration support Compact surface-mount package Factory calibrated output Long-term measurement stability Optimized for indoor air quality applications Low-profile PCB mounting design RoHS and halogen-free compliant Electrical Characteristics Low-voltage supply operation Low average current consumption suitable for portable devices Integrated digital signal processing Non-volatile calibration memory Standard I²C communication compatibility Stable operation across industrial environmental conditions Mechanical Characteristics Compact SMD package for space-constrained applications Surface-mount assembly compatible Low-profile package structure Integrated optical cavity and sensing chamber Moisture-sensitive device requiring controlled handling during assembly Functional Characteristics Real-time carbon dioxide concentration monitoring Simultaneous temperature and humidity measurement Automatic environmental compensation Continuous and periodic measurement modes Fast startup and measurement response Long operational lifetime with stable calibration Optimized airflow design for accurate sensing Suitable for continuous indoor environmental monitoring Typical Applications Indoor air quality monitoring systems Smart thermostats and HVAC controllers Building automation equipment Demand-controlled ventilation systems Portable environmental monitoring devices Smart home and IoT products Air purification systems Occupancy and ventilation monitoring Battery-powered sensing devices Consumer and industrial environmental monitoring equipment #commonpartslibrary #sensor #airquality

Power Barrel Connector Jack 2.50mm ID (0.098"), 5.50mm OD (0.217") Through Hole, Right Angle DC power jack designed to provide a through-hole interface for external DC power input. It features a 2.0 mm center pin, 6.5 mm mating diameter, right-angle through-hole mounting, and is rated for 2 A and 24 VDC, with an operating temperature range of -25°C to +85°C. #DCPowerJack #BarrelJack #PowerConnector #ThroughHole #SameSkyDevices

Humidity, Temperature 0 ~ 100% RH I2C ±1.8% RH 4 s Surface Mount The SHT41-AD1B-R3 is a high-precision digital humidity and temperature sensor developed by Sensirion. It integrates calibrated sensing elements, analog signal processing, and a digital communication interface within a compact surface-mount package optimized for space-constrained embedded applications. The device is designed for accurate environmental monitoring across industrial, consumer, HVAC, portable electronics, and IoT systems. The sensor utilizes Sensirion CMOSens® technology to provide stable long-term performance, fast response time, and excellent repeatability under varying environmental conditions. Factory calibration enables direct digital output without the need for external calibration circuitry. The integrated I²C interface simplifies system integration with microcontrollers and embedded processors. The SHT41-AD1B-R3 is engineered for low-power operation, making it suitable for battery-powered and energy-efficient designs. Its compact DFN package supports automated assembly processes and high-density PCB layouts. The device also incorporates advanced internal diagnostics and checksum protection to improve communication reliability and data integrity. Features High-accuracy relative humidity sensing High-accuracy temperature measurement Fully calibrated and linearized digital output I²C digital communication interface Low power consumption optimized for portable systems Fast response and measurement conversion time Excellent long-term stability and repeatability Integrated heater functionality for condensation mitigation Wide operating voltage range Compact surface-mount DFN package Factory-trimmed and tested performance High immunity to environmental stress and contamination Low drift over product lifetime Suitable for reflow soldering processes Electrical Characteristics Supply voltage supports low-voltage embedded systems Digital communication compatible with standard I²C hosts Low standby current consumption Optimized active measurement current Integrated CRC data protection for communication integrity Environmental Characteristics Wide operating temperature range Wide relative humidity operating range Designed for high reliability in industrial and consumer environments Resistant to moisture-induced performance degradation Supports long operational lifetime with stable calibration Package Information Compact DFN surface-mount package Moisture-sensitive device suitable for automated assembly RoHS compliant and halogen-free construction Tape-and-reel packaging configuration for production assembly Applications Environmental monitoring systems HVAC and climate control equipment Smart home and IoT devices Portable electronics Industrial automation systems Data loggers and instrumentation Weather monitoring equipment Indoor air quality monitoring Battery-powered sensor nodes Consumer electronic products #commonpartslibrary #sensor #temperature #humidity #environmentalsensor #i2c #embedded #industrial #iot #sensirion

Synchronous Step-Down Converter with External Soft Start #ultralibrarian

Synchronous Step-Down Converter with External Soft Start #ultralibrarian

802.15.4, Bluetooth, WiFi 802.11b/g/n/ac/ax, Bluetooth v5.0, Thread, Zigbee® Transceiver Module 2.412GHz ~ 2.484GHz, 5.18GHz ~ 5.885GHz Antenna Not Included Surface Mount RF wireless module integrating the ESP32-C5 SoC for Wi-Fi, Bluetooth LE, and IEEE 802.15.4 connectivity. Operates from a 3.0 V to 3.6 V supply and features a 32-bit RISC-V processor with 2.4 GHz Wi-Fi 6, Bluetooth 5 (LE), IEEE 802.15.4, 8 MB flash, 8 MB PSRAM, and an external antenna connector (U.FL/IPEX) for wireless communication. #RFModule #WiFi6 #BluetoothLE #IEEE802154 #ESP32C5 #RISCV #QFNModule

Synchronous Step-Down Converter with External Soft Start #ultralibrarian

Peak Current Mode Boost PWM Controller with Programmable Frequency external SS and Light Load #ultralibrarian

Multiphase Motor Driver Power MOSFET SPI 48-VQFN (7x7) DRV8353RSRGZR is a three-phase smart gate driver designed to control external N-channel MOSFETs in brushless DC (BLDC), permanent magnet synchronous motor (PMSM), and other three-phase motor drive applications. It operates from a 9 V to 100 V supply, supports SPI communication for device configuration and diagnostics, integrates three high-side and three low-side gate drivers with programmable gate drive strength, and includes protection features such as VDS overcurrent, undervoltage, overtemperature, and gate driver fault detection in a 48-pin VQFN package. #TexasInstruments #DRV8353RSRGZR #GateDriver #ThreePhaseMotorDriver #BLDC #PMSM #MOSFETDriver #SPI #MotorControl #VQFN48

Wide Input 3.3V - 30V 3A 12µA IQ Synchronous Step-Down Converter with External Soft Start and Power Good in Small 2x3mm QFN Package #ultralibrarian

ARM® Cortex®-M0+ - Microcontroller IC 32-Bit Dual-Core 133MHz External Program Memory 56-QFN (7x7) Part Description The RP2040 by Raspberry Pi is an ARM® Cortex®-M0+ microcontroller featuring a 32-Bit Dual-Core processor capable of running at 133MHz. It supports external program memory and integrates a comprehensive set of peripherals including I2C, IrDA, QSPI, SPI, UART/USART, USB, and more. This IC is packaged in a 56-pin QFN (7x7) with exposed pads, making it ideal for surface-mount applications and high-density designs. Additional features include integrated data converters (4x12b SAR A/D), 264K x 8 RAM, and robust connectivity along with peripherals like brown-out detection, DMA, I2S, LCD control, POR, PWM, and Watchdog Timer. Note that the image is a representation only; exact specifications must be confirmed via the product datasheet. Manufacturer Lead Time: 8 Weeks Packaging Options: Tape & Reel (TR) Cut Tape (CT) Digi-Reel® Hashtags #RP2040 #ARM #CortexM0Plus #DualCore #133MHz #Microcontroller #Embedded #RaspberryPi #56QFN #SurfaceMount #ExternalMemory #TapeAndReel #CutTape #DigiReel

Single-Core Arm® Cortex®-A7 Microprocessor (MPU) – 32-bit embedded microprocessor designed for industrial automation, Human-Machine Interfaces (HMI), IoT gateways, edge computing, smart home devices, medical equipment, multimedia systems, and Linux-based embedded applications. Part of the STM32MP1 Series, the STM32MP135FAF7 integrates a single Arm® Cortex®-A7 core operating at up to 1 GHz, with NEON™ SIMD multimedia acceleration and 3D graphics acceleration for enhanced application performance. Supports external DDR3, DDR3L, LPDDR2, and LPDDR3 memory, enabling high-performance operating systems such as Linux. Features dual Gigabit Ethernet, dual USB 2.0, CAN FD, I²C, SPI, UART/USART, SAI, SPDIF, MMC/SD/SDIO, GPIO, and IRDA interfaces for flexible connectivity. Includes advanced security features such as Arm TrustZone®, AES encryption, SHA-1/SHA-2, Secure Boot, Secure Debug, True Random Number Generator (TRNG), tamper detection, and volatile key storage for secure embedded applications. Operates with 1.8 V, 2.5 V, and 3.3 V I/O supplies, supports a −40°C to +105°C junction temperature range, and is packaged in a 320-ball TFBGA (11 × 11 mm). #STMicroelectronics #STM32MP135FAF7 #STM32MP1 #CortexA7 #Microprocessor #LinuxMPU #IndustrialAutomation #EdgeComputing #IoTGateway #GigabitEthernet #TrustZone #EmbeddedLinux #EmbeddedSystems

Buzzers Transducer, Externally Driven Piezo 5 V 2kHz 70dB @ 5V, 10cm THT PC Pins Piezoelectric buzzer for generating audible alerts from an external drive signal, featuring a 2 kHz resonant frequency and a 5 V_0-p rated input voltage. It provides a minimum sound pressure level of 70 dB(A) at 10 cm (2 kHz, 5 V_0-p rectangular wave), supports a maximum input voltage of 30 V_0-p without DC bias, and operates over a −10°C to +70°C temperature range. #TDK #PiezoelectricBuzzer #Buzzer #2kHz #5V #70dBA #ThroughHole #AudioIndicator #ElectronicComponents #PCBDesign

Battery Power Management IC Multi-Chemistry 14-TSSOP The bq34210-Q1 1-Series Cell System-Side CEDV Fuel Gauge provides fuel gauging and End-of-Service (EOS) Determination for 1-series cell batteries in applications that encounter infrequent discharge, such as eCall systems and uninterruptible power supplies (UPS) for backup during power failures, where batteries may stay connected to a charging power source most of their lifetime until needed. The bq34210-Q1 fuel gauge supports multiple battery chemistries, including Li-Ion, LiFePO4, and NiMH. The gas gauging function uses voltage, current, and temperature data along with Compensated End-ofDischarge (CEDV) technology to provide State-ofCharge (SOC) and State-of-Health (SOH) data. The device's EOS Determination function alerts when battery capability has degraded and is approaching the end of its usable service. Battery fuel gauging with the bq34210-Q1 fuel gauge requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack or embedded battery management system. Features 1• Automotive-Qualified AEC-Q100, Grade 3 • 1-Series Cell Battery Fuel Gauge Supports Li-Ion, LiFePO4, and NiMH (3-Cell) Chemistries – Resides on System Board – Powers Directly from the Battery with Integrated LDO – Supports a Low-Value External Sense Resistor (10 mΩ) • Learning Load Enable (LEN) from Host • Ultra-Low Power Consumption in NORMAL (50 µA) and SLEEP (9 µA) Modes • Supports Replacement Batteries • Accurate End-of-Service (EOS) Determination for Batteries in Rarely Discharged Applications • CEDV Gas Gauge for 1-Series Cell Batteries, Providing: – State-of-Charge (SOC) – Time-to-Empty (TTE) – State-of-Health (SOH) • High-Side and Low-Side Current Sensing Options • Internal Temperature Sensor OR External Thermistor • Microcontroller Peripheral Interface Supports: – 400-kHz I 2C™ Serial Interface – Configurable Interrupt (ALERT) for SOC, Battery Levels, Temperature Faults, and Charge/Discharge Status 2 Applications • eCall Systems • Telematics Backup Systems • Uninterruptible Power Supply (UPS) Backup Systems • Emergency Battery Power Modules #BatteryFuelGauge #BatteryManagement #FuelGaugeIC #AutomotiveElectronics #TexasInstruments #LiIonBattery #LiFePO4 #I2C #PowerManagement #AECQ100 #BackupBattery #UPS #EmbeddedSystems

24 Bit Analog to Digital Converter 4, 8 Input 4 Sigma-Delta 56-VQFN (7x7) The ADS127L14 (quad) and ADS127L18 (octal) are 24-bit, delta-sigma (ΔΣ), analog-to-digital converters (ADCs) based on the single-channel ADS127L11. The devices provide simultaneous sampling of four or eight channels with data rates up to 512kSPS (wideband filter mode) and 1365kSPS (low-latency filter mode). Features • Simultaneously measure four or eight channels • Wideband filter mode: up to 512kSPS • Low-latency filter mode: up to 1365kSPS • Power-scalable speed modes: – Max speed: 512kSPS • 83mW (ADS127L14) • 165mW (ADS127L18) – High speed: 400kSPS • 64mW (ADS127L14) • 128mW (ADS127L18) – Mid speed: 200kSPS • 37mW (ADS127L14) • 74mW (ADS127L18) – Low speed: 50kSPS • 12mW (ADS127L14) • 24mW (ADS127L18) • AC performance with DC precision: (High-Speed Mode) – Dynamic range at 200kSPS: 112dB (typical) – THD: –118dB (typical) – INL: 1ppm of FSR (typical) – Offset drift: 10nV/°C (typical) – Gain drift: 0.5ppm/°C (typical) • Precharge buffered signal inputs • Programmable by pin setting or SPI • Frame-sync port for output data • Internal or external clock operation • Analog supply voltage: 2.85V to 5.5V 2 Applications • Test and measurement: – Data acquisition (DAQ) – Shock and vibration instruments – Acoustics and dynamic strain gauges • Factory automation and control: – Condition monitoring • Aerospace and defense: – Sonar • Medical: – Electroencephalograms (EEG) • Grid Infrastructure: – Power quality analyzers #ADS127L14IRSHT #TexasInstruments #ADC #DeltaSigmaADC #24BitADC #SimultaneousSampling #DataAcquisition #IndustrialAutomation #MedicalInstrumentation #PowerQuality #PrecisionMeasurement #EmbeddedSystems

Dual Non-Inverting Open-Drain Buffer IC – Dual non-inverting buffer with open-drain outputs for logic level translation, bus interfacing, signal buffering, wired-AND logic, and embedded digital systems. Operates from a 1.65 V to 5.5 V supply and features two independent 1-bit buffer channels capable of sinking up to 32 mA per output. The open-drain outputs allow direct interfacing with multiple voltage domains using external pull-up resistors, making the device suitable for I²C buses, interrupt lines, LED driving, and mixed-voltage logic applications. Features high-speed CMOS operation, low static power consumption, 5.5 V input tolerance, and is specified for operation over a −40°C to +85°C ambient temperature range. Housed in a 6-pin SC-88 (SC-70-6 / SOT-363) surface-mount package. #onsemi #NC7WZ07P6X #LogicBuffer #OpenDrain #NonInvertingBuffer #LogicIC #LevelShifter #I2C #SignalBuffer #WiredAND #SC88 #EmbeddedSystems

32V 6A High-Efficiency Synchronous Step-Down Converter with External Soft Start #ultralibrarian

2.4 GHz Wi-Fi® + Bluetooth® 5 SoC – High-performance dual-core Xtensa® LX7 wireless System-on-Chip (SoC) for IoT devices, smart home products, industrial automation, AIoT, wearable electronics, HMI systems, and embedded wireless applications. Operates at up to 240 MHz with 512 KB on-chip SRAM and supports external SPI Flash and PSRAM. Integrates Wi-Fi 802.11 b/g/n (2.4 GHz) and Bluetooth® 5 (LE) with Long Range and 2 Mbps PHY, delivering up to +21 dBm transmit power and 150 Mbps maximum Wi-Fi data rate. Features native USB 2.0 OTG, AI vector instructions for machine learning acceleration, 30 GPIOs, SPI, I²C, I²S, UART, RMT, LCD/Camera interface, TWAI® (CAN-compatible), PWM, ADC, capacitive touch sensing, AES-128/256, SHA, RSA, ECC, HMAC, Flash encryption, Secure Boot, and a True Random Number Generator (TRNG) for secure embedded applications. Operates from a 3.0 V to 3.6 V supply, over a −40°C to +105°C temperature range, and is housed in a 56-pin QFN (7 × 7 mm) package. #EspressifSystems #ESP32S3 #WirelessSoC #WiFi #Bluetooth5 #DualCore #XtensaLX7 #USBOTG #AIoT #IoT #SecureBoot #FlashEncryption #EmbeddedSystems

10mA (with external R up to 65mA) constant current driver (linear), max 40V, SOT457 (SC-74) LED driver constant current SC?74*