Bipolar (BJT) Transistor NPN 40V 200 mA 300MHz 625 mW Through Hole TO-92-3 The 2N3904TFR is a general-purpose NPN bipolar junction transistor (BJT) designed for low-power amplification and switching applications. It is widely used in signal processing, small-signal amplification, and digital switching circuits. This transistor offers fast switching speed, low saturation voltage, and reliable performance in a compact surface-mount package, making it suitable for consumer electronics, industrial controls, and embedded systems. Manufacturer Various (commonly ON Semiconductor / onsemi, Diodes Inc., Central Semiconductor) Part Number 2N3904TFR Transistor Type NPN Bipolar Junction Transistor (BJT) Configuration Single Package / Case SOT-23 (TO-236AB) Mounting Style Surface Mount (SMD/SMT) Collector-Emitter Voltage (VCEO) 40 V Collector-Base Voltage (VCBO) 60 V Emitter-Base Voltage (VEBO) 6 V Collector Current (IC) 200 mA (max) Power Dissipation (PD) ~200 mW to 350 mW (package dependent) DC Current Gain (hFE) 100 to 300 (typical, varies with operating conditions) Transition Frequency (fT) ~300 MHz Collector-Emitter Saturation Voltage (VCE(sat)) ~0.2 V (typical at IC = 10 mA, IB = 1 mA) Operating Temperature Range -55°C to +150°C Polarity NPN Packaging Tape & Reel (TFR suffix) RoHS Compliance Compliant #commonpartslibrary #transistor #bjt

Bluetooth, WiFi 802.11b/g/n/ax, Bluetooth v5.4 Transceiver Module 2.4GHz Integrated, Chip Surface Mount Silicon Labs SiWG917 module is our lowest power Wi-Fi 6 plus Bluetooth LE 5.4, ideal for ultra-low power IoT wireless devices using Wi-Fi®, Bluetooth, Matter, and IP networking for secure cloud connectivity. It is optimal for developing battery operated devices that need long battery life. SiWG917 module includes an ultra-low power Wi-Fi 6 plus Bluetooth Low Energy (LE) 5.4 wireless CPU subsystem, and an integrated micro-controller (MCU) application subsystem, security, peripherals and power management subsystem all in a single 16 x 21.1 x 2.3 mm package. The wireless subsystem consists of a multi-threaded Network Wireless Processor (NWP) running up to 160 MHz, baseband digital signal processing, analog front end, 2.4 GHz RF transceiver and integrated power amplifier. The application subsystem consists of an ARM® Cortex®-M4 running up to 180 MHz, embedded SRAM, flash, ultra-low power sensor hub, and matrix vector processor. The ARM® Cortex®-M4 is dedicated for peripheral and application-related processing, while the NWP runs the wireless and networking stacks on independent threads, thus providing a fully integrated solution that is ready for a wide range of embedded wireless IoT applications. The modules come with modular radio type approvals for various countries, including USA (FCC), Canada (IC/ISED) and Japan (MIC), and are in compliance with the relevant EN standards (including EN 300 328 v2.2.2) for the conformity with the directives and regulations in EU and UK. KEY FEATURES • Wi-Fi 6 Single Band 2.4 GHz 20 MHz 1x1 stream IEEE 802.11 b/g/n/ax • Bluetooth LE 5.4 • Single chip Matter Over Wi-Fi Solution • ARM® Cortex® M4 Processor with FPU subsystem up to 180 MHz with rich set of Digital and Analog Peripherals. • Wi-Fi 6 Benefits: TWT for improved efficiency and longer battery life, MUMIMO/OFDMA for Higher Throughput, network capacity and low latency • Best in Class Device and Wireless Security • WLAN Tx power up to +17.5 dBm with integrated PA • Bluetooth LE Tx power up to +17 dBm with integrated PA • WLAN Rx sensitivity as low as -95.5 dBm • Wi-Fi 4 Standby Associated mode current: 71 μA @ 1-second listen interval • Embedded Flash option up to 8 MB/ optional external Flash up to 16 MB • Embedded PSRAM option up to 2 MB/ optional external PSRAM option up to 16 MB • Ultra-low power sensor hub peripherals • Matrix Vector Processor (MVP) • Embedded Wi-Fi, Bluetooth LE, Matter, and networking stacks supporting wireless coexistence • Three software-configurable MCU application memory options for sharing the RAM between the wireless, system, and application (192/256/320 KB) • Operating temperature: -40 to +85 ºC • Operating supply range: 3.0 to 3.63 V • Supply voltage for GPIOs: 1.71 to 3.63 V #WiFi6 #BluetoothLE54 #IoTModule #WirelessSoC #SiliconLabs #EmbeddedSystems #SmartHome #IndustrialIoT #LowPowerDesign #RFModule #ConnectedDevices #EdgeComputing #MatterReady #PCBDesign #ElectronicsEngineering

555 Type, Timer/Oscillator (Single) IC 100kHz 8-SOIC #CommonPartsLibrary #IntegratedCircuit #Clock/Timing #Programmable-Timer #Oscillator

Power Switch/Driver 1:1 P-Channel 2.1A W-DFN2020-6 (Type A1) #commonpartslibrary #integratedcircuit #powermanagement #powerswitch

1 kOhms 0.25W, 1/4W Through Hole Slide Potentiometer Top Adjustment Type #commonpartslibrary #potentiometer #variableresistor

8 Position Connector Receptacle, Center Strip Contacts Surface Mount Gold The TE Connectivity part 2386586-1 is a fine-pitch board-to-board (BTB) PCB receptacle connector designed for compact, high-density electronic devices. It is a vertical surface-mount connector with 8 positions and a 0.4 mm pitch, commonly used in portable electronics, embedded systems, and space-constrained PCB designs. Key Features Connector Type: PCB mount receptacle Connector System: Board-to-board (BTB) Positions: 8-pin Pitch: 0.4 mm fine pitch Rows: 2 Mounting Style: Surface mount (SMT) Orientation: Vertical Stack Height: 0.8 mm low-profile design Contact Plating: Gold (Au) Contact Material: Copper alloy Rated Current: 0.5 A max per contact Operating Voltage: 60 VDC Temperature Range: −40 °C to +85 °C Housing Material: High-temperature thermoplastic Application: Signal transmission in compact electronics Packaging: Tape & Reel for automated assembly This connector is optimized for: Compact embedded systems Wearables and handheld devices High-density PCB stacking Consumer electronics Low-profile modular designs

7.2VA Power Transformer 3.3V Primary 6V Secondary Chassis Mount The DA2304-ALD is a compact surface-mount isolation power transformer manufactured by Coilcraft. It is designed primarily for low-voltage DC/DC converter applications, especially in circuits that require galvanic isolation. It is commonly used together with ICs like isolated power drivers (e.g., SN6501) to generate isolated power rails. Type: Isolation / power transformer Mounting: Surface-mount (SMT) Primary Voltage: 3.3 V Secondary Voltage: 6 V (typical) Power Rating: ~7.2 W Turns Ratio: 1 : 2.2 Isolation Voltage: up to 2500 Vrms Windings: Dual primary and dual secondary Core Material: Ferrite Operating Temp: −40°C to +125°C Isolated DC/DC converters Industrial communication interfaces (RS-485, CAN, etc.) Medical or safety-isolated systems Powering isolated gate drivers or transceivers Small footprint (~10 × 8 mm, low profile ~6 mm) #Transformer

555 Type, Timer/Oscillator (Dual) IC 500kHz 14-SOIC #Timer #commonpartslibrary

Accelerometer X, Y, Z Axis ±400g 160Hz ~ 2.56kHz 16-LGA (3x3.25) The ADXL373BCCZ-RL7 is an ultralow power, high-g digital MEMS accelerometer developed by Analog Devices for motion sensing and impact detection applications. The device is optimized for battery-powered and always-on systems requiring continuous acceleration monitoring with minimal power consumption. It supports selectable measurement ranges suitable for shock, vibration, and activity monitoring in industrial, wearable, medical, asset tracking, and IoT applications. The accelerometer integrates embedded motion detection features, a FIFO buffer, and interrupt capabilities to reduce host processor workload and overall system power consumption. Engineering Specification Device Type Ultralow power 3-axis digital MEMS accelerometer Manufacturer Analog Devices Inc. Manufacturer Part Number ADXL373BCCZ-RL7 Measurement Axes Three-axis acceleration sensing Acceleration Range Selectable full-scale ranges supporting high-g measurements up to ±400 g Output Interface SPI digital serial communication interface Resolution High-resolution digital acceleration output with integrated filtering and signal conditioning Power Supply Requirement Operates from a low-voltage DC supply suitable for portable and embedded systems Power Consumption Designed for extremely low current operation during measurement and wake-up monitoring modes Embedded Features Integrated activity detection Motion and impact sensing FIFO data buffering Interrupt generation Wake-up detection functionality Sampling and Performance Programmable output data rates and filtering options for optimized noise and bandwidth performance Operating Temperature Range Industrial temperature range suitable for harsh environmental applications Package Type LGA surface-mount package Mounting Style Surface mount technology Application Areas Impact event recording Condition monitoring Asset tracking Industrial sensing Wearable electronics Portable instrumentation Shock and vibration monitoring Always-on motion detection systems #commonpartslibrary #integratedcircuit #accelerometer #sensor

555 Type, Timer/Oscillator (Single) IC - 8-SOIC #Timer #commonpartslibrary

Audio Transformers / Signal Transformers POE70P Flyback 7uH 5.0 V 1.4 A SMD,12.7x10.5mm Pulse Transformers RoHS The POE70P-50LD, manufactured by Coilcraft, is a magnetic component designed for PoE applications, where electrical power is delivered together with data over Ethernet cables. It is optimized for isolated DC-DC conversion in network-powered devices. Key Characteristics Part Type: PoE transformer / flyback transformer Technology: Magnetic (ferrite core) transformer Mounting: Surface-mount (SMT) Power Rating: ~7 W Isolation Voltage: up to 1500 Vrms Input Range: typically 36–72 V (PoE standard range) Output Example: ~5 V / 1.4 A (depending on design) Core Material: Ferrite Operating Temp: −40 °C to +85 °C Function (How it works) Converts high-voltage PoE input into low-voltage DC output Provides galvanic isolation between Ethernet line and device Works in a flyback converter topology Supports efficient energy transfer and EMI control Typical Applications IP cameras VoIP phones Wireless access points Network switches Industrial IoT devices #CommonPartsLibrary #Transformer

Polymeric PTC Resettable Fuse 60V 500 mA Ih Surface Mount 2-SMD 500mA resettable fuse pptc The SMD050F-2 is a surface-mount resettable fuse (PPTC – Polymer Positive Temperature Coefficient) designed to provide overcurrent protection in low-voltage electronic circuits. It operates by increasing its resistance significantly when excessive current flows, thereby limiting current and protecting downstream components. Once the fault condition is removed and the device cools, it automatically resets to its low-resistance state, enabling normal operation without replacement. This component is commonly used in power supply lines, USB ports, battery-powered devices, and general electronic protection applications where space-saving and reliability are important. Key Features Resettable overcurrent protection (self-recovering) Surface-mount package for compact PCB layouts Low resistance in normal operation Fast response to fault conditions Automatic reset after fault removal RoHS compliant and lead-free Electrical Characteristics Hold current: 0.5 A Trip current: 1.0 A (typical) Maximum voltage: 60 V Maximum current: 40 A (fault current rating) Initial resistance: low resistance range suitable for minimal voltage drop Resistance after trip: significantly increased to limit current Thermal Characteristics Operating temperature range: -40°C to +85°C Trip time dependent on applied current and ambient temperature Reset time dependent on cooling conditions Mechanical Characteristics Package type: Surface-mount (SMD) Compact footprint suitable for dense PCB layouts Compatible with standard reflow soldering processes Applications USB and peripheral port protection Power supply and DC line protection Battery pack protection Consumer electronics Industrial control circuits Compliance and Standards RoHS compliant Halogen-free (depending on manufacturer variant) Meets industry standards for resettable fuses #commonpartslibrary #circuitprotection #ptc #fuse