Littelfuse is delicated to manufacturing products that are crucial components in applications that use electrical energy. These applications include consumer electronics, vehicles and industrial facilities. We provide the most extensive portfolio of circuit protection products in the industries. In the meantime, we provide the growing platforms in power control and sensing. They are expanding into adjoining markets contain power semiconductors, heavy-duty switches, magnetic, optical, electromechanical, and temperature sensors. We focus on products that provide safe control and distribution of electrical power.
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Circuit Protection
TVS - Mixed Technology Fuses Inrush Current Limiters (ICL) Circuit Breakers Lighting Protection Electrical, Specialty Fuses TVS - Varistors, MOVs Gas Discharge Tube Arresters (GDT) Accessories TVS - Surge Protection Devices (SPDs) Thermal Cutoffs (Thermal Fuses) TVS - Thyristors Ground Fault Circuit Interrupter (GFCI) TVS - Diodes PTC Resettable Fuses FuseholdersDiscrete Semiconductor Products
Thyristors - TRIACs Thyristors - DIACs, SIDACs Transistors - Special Purpose Transistors - FETs, MOSFETs - Arrays Thyristors - SCRs Diodes - RF Transistors - IGBTs - Arrays Diodes - Bridge Rectifiers Diodes - Zener - Single Power Driver Modules Transistors - Bipolar (BJT) - Single Transistors - IGBTs - Modules Diodes - Rectifiers - Arrays Transistors - IGBTs - Single Diodes - Rectifiers - Single Thyristors - SCRs - Modules Transistors - FETs, MOSFETs - SingleIndustrial Automation and Controls
Controllers - Liquid, Level Panel Meters Pneumatics, Hydraulics Controllers - Process, Temperature Time Delay Relays Protection Relays & Systems Controllers - Accessories Monitor - Current/Voltage Transducer Monitor - Relay Output Controllers - PLC Modules Panel Meters - Counters, Hour Meters Accessories Machine Vision - Lens SpecializedSensors, Transducers
Accessories Proximity Sensors Temperature Sensors - Thermostats - Mechanical Float, Level Sensors Motion Sensors - Vibration Optical Sensors - Photoelectric, Industrial Magnetic Sensors - Switches (Solid State) Temperature Sensors - PTC Thermistors Temperature Sensors - Analog and Digital Output Position Sensors - Angle, Linear Position Measuring Magnets - Multi Purpose Temperature Sensors - RTD (Resistance Temperature Detector) Magnetic Sensors - Linear, Compass (ICs) Current Sensors Magnetic Sensors - Position, Proximity, Speed (Modules) Temperature Sensors - NTC Thermistors Sensor Interface - Junction Blocks Flow Sensors Temperature Sensors - Thermocouple, Temperature Probes Motion Sensors - Tilt Switches Shock Sensors Magnets - Sensor Matched Pressure Sensors, TransducersCables, Wires - Management
Switches
Rotary Switches Accessories - Boots, Seals Configurable Switch Components - Body Toggle Switches Pushbutton Switches Snap Action, Limit Switches Keylock Switches Selector Switches Navigation Switches, Joystick Accessories - Caps Programmable Display Switches DIP Switches Rocker Switches Magnetic, Reed Switches Cable Pull Switches Slide Switches Accessories Disconnect Switch ComponentsConnectors, Interconnects
Coaxial Connectors (RF) - Adapters Banana and Tip Connectors - Jacks, Plugs Circular Connectors - Adapters Barrel - Audio Connectors Terminal Strips and Turret Boards Terminal Blocks - Interface Modules Pluggable Connectors - Accessories Modular Connectors - Wiring Blocks Circular Connectors - Housings Rectangular Connectors - Contacts Modular Connectors - Jacks With Magnetics Terminal Blocks - Specialized Coaxial Connectors (RF) Rectangular Connectors - Accessories Terminals - Ring Connectors Terminals - Wire Pin Connectors Rectangular Connectors - Free Hanging, Panel Mount Circular Connectors Barrel - Accessories Terminal Blocks - Wire to Board Terminal Blocks - Din Rail, Channel Coaxial Connectors (RF) - Contacts Terminal Blocks - Accessories - Jumpers Terminals - PC Pin, Single Post Connectors Circular Connectors - Backshells and Cable Clamps Terminals - Spade Connectors D-Sub, D-Shaped Connectors - Accessories - Jackscrews Terminal Blocks - Adapters Circular Connectors - Contacts Terminals - Quick Connects, Quick Disconnect Connectors Fiber Optic Connectors Contacts - Multi Purpose Power Entry Connectors - Accessories Terminals - Specialized Connectors Terminal Blocks - Barrier Blocks Banana and Tip Connectors - Binding Posts Rectangular Connectors - Adapters Terminals - Screw Connectors D-Sub Connectors D-Sub, D-Shaped Connectors - Adapters Rectangular Connectors - Headers, Male Pins Circular Connectors - Accessories Terminal Blocks - Headers, Plugs and Sockets Terminal Blocks - Accessories Coaxial Connectors (RF) - Terminators Terminal Blocks - Power Distribution Terminals - Adapters Terminal Blocks - Accessories - Wire Ferrules Between Series Adapters Terminals - Rectangular Connectors Solid State Lighting Connectors Contacts, Spring Loaded and Pressure Terminals - Wire Splice Connectors Blade Type Power Connectors - ContactsRelays
Hardware, Fasteners, Accessories
Resistors
Integrated Circuits (ICs)
PMIC - Hot Swap Controllers PMIC - Voltage Regulators - DC DC Switching Regulators Embedded - Microcontroller, Microprocessor, FPGA Modules PMIC - Lighting, Ballast Controllers Interface - Analog Switches - Special Purpose Interface - Telecom Interface - Sensor and Detector Interfaces PMIC - Voltage Reference Embedded - FPGAs (Field Programmable Gate Array) PMIC - Voltage Regulators - Linear PMIC - Supervisors Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps PMIC - Power Distribution Switches, Load Drivers PMIC - Gate Drivers PMIC - Voltage Regulators - DC DC Switching Controllers PMIC - Power Supply Controllers, Monitors PMIC - LED Drivers Interface - Specialized Embedded - Microcontrollers - Application Specific Clock/Timing - Programmable Timers and Oscillators Specialized ICs Interface - Drivers, Receivers, Transceivers Memory PMIC - Battery ManagementKits
Optoelectronics
Cables, Wires
Audio Products
Capacitors
Labels, Signs, Barriers, Identification
Tools
Wire Cutters Crimpers - Crimp Heads, Die Sets Specialized Tools Hammers Accessories Insertion, Extraction Screw and Nut Drivers - Sets Sockets - Sets Pliers Fiber Optics and Accessories Crimpers, Applicators, Presses Screw and Nut Drivers Wrenches Screw and Nut Drivers - Bits, Blades and Handles Chemicals, Cleaners Abrasives and Surface Conditioning Products Sockets, Socket Handles Heat Guns, Torches, Accessories Flashlights Crimpers, Applicators, Presses - Accessories Hex, Torx Keys Personal Protective Equipment (PPE)Cable Assemblies
Isolators
Motors, Solenoids, Driver Boards/Modules
Inductors, Coils, Chokes
Battery Products
Filters
Transformers
Boxes, Enclosures, Racks
Soldering, Desoldering, Rework Products
Potentiometers, Variable Resistors
Tapes, Adhesives, Materials
Development Boards, Kits, Programmers
RF/IF and RFID
Line Protection, Distribution, Backups
Test and Measurement
Maker/DIY, Educational
Computer Equipment
Crystals, Oscillators, Resonators
Networking Solutions
Fans, Thermal Management
Static Control, ESD, Clean Room Products
Power Supplies - Board Mount
Power Supplies - External/Internal (Off-Board)
Prototyping, Fabrication Products
Optical Inspection Equipment
Circuit Protection
- TVS - Mixed TechnologyFusesInrush Current Limiters (ICL)Circuit BreakersLighting ProtectionElectrical, Specialty FusesTVS - Varistors, MOVsGas Discharge Tube Arresters (GDT)AccessoriesTVS - Surge Protection Devices (SPDs)Thermal Cutoffs (Thermal Fuses)TVS - ThyristorsGround Fault Circuit Interrupter (GFCI)TVS - DiodesPTC Resettable FusesFuseholders
Discrete Semiconductor Products
- Thyristors - TRIACsThyristors - DIACs, SIDACsTransistors - Special PurposeTransistors - FETs, MOSFETs - ArraysThyristors - SCRsDiodes - RFTransistors - IGBTs - ArraysDiodes - Bridge RectifiersDiodes - Zener - SinglePower Driver ModulesTransistors - Bipolar (BJT) - SingleTransistors - IGBTs - ModulesDiodes - Rectifiers - ArraysTransistors - IGBTs - SingleDiodes - Rectifiers - SingleThyristors - SCRs - ModulesTransistors - FETs, MOSFETs - Single
Industrial Automation and Controls
- Controllers - Liquid, LevelPanel MetersPneumatics, HydraulicsControllers - Process, TemperatureTime Delay RelaysProtection Relays & SystemsControllers - AccessoriesMonitor - Current/Voltage TransducerMonitor - Relay OutputControllers - PLC ModulesPanel Meters - Counters, Hour MetersAccessoriesMachine Vision - LensSpecialized
Sensors, Transducers
- AccessoriesProximity SensorsTemperature Sensors - Thermostats - MechanicalFloat, Level SensorsMotion Sensors - VibrationOptical Sensors - Photoelectric, IndustrialMagnetic Sensors - Switches (Solid State)Temperature Sensors - PTC ThermistorsTemperature Sensors - Analog and Digital OutputPosition Sensors - Angle, Linear Position MeasuringMagnets - Multi PurposeTemperature Sensors - RTD (Resistance Temperature Detector)Magnetic Sensors - Linear, Compass (ICs)Current SensorsMagnetic Sensors - Position, Proximity, Speed (Modules)Temperature Sensors - NTC ThermistorsSensor Interface - Junction BlocksFlow SensorsTemperature Sensors - Thermocouple, Temperature ProbesMotion Sensors - Tilt SwitchesShock SensorsMagnets - Sensor MatchedPressure Sensors, Transducers
Cables, Wires - Management
- Protective Hoses, Solid Tubing, SleevingBushings, GrommetsCable and Cord GripsPulling, Support GripsLabels, LabelingGrounding Braid, StrapsMarkersCable Ties and Cable LacingHeat Shrink TubingSolder SleeveAccessoriesHeat Shrink Boots, CapsCable Supports and Fasteners
Switches
- Rotary SwitchesAccessories - Boots, SealsConfigurable Switch Components - BodyToggle SwitchesPushbutton SwitchesSnap Action, Limit SwitchesKeylock SwitchesSelector SwitchesNavigation Switches, JoystickAccessories - CapsProgrammable Display SwitchesDIP SwitchesRocker SwitchesMagnetic, Reed SwitchesCable Pull SwitchesSlide SwitchesAccessoriesDisconnect Switch Components
Connectors, Interconnects
- Coaxial Connectors (RF) - AdaptersBanana and Tip Connectors - Jacks, PlugsCircular Connectors - AdaptersBarrel - Audio ConnectorsTerminal Strips and Turret BoardsTerminal Blocks - Interface ModulesPluggable Connectors - AccessoriesModular Connectors - Wiring BlocksCircular Connectors - HousingsRectangular Connectors - ContactsModular Connectors - Jacks With MagneticsTerminal Blocks - SpecializedCoaxial Connectors (RF)Rectangular Connectors - AccessoriesTerminals - Ring ConnectorsTerminals - Wire Pin ConnectorsRectangular Connectors - Free Hanging, Panel MountCircular ConnectorsBarrel - AccessoriesTerminal Blocks - Wire to BoardTerminal Blocks - Din Rail, ChannelCoaxial Connectors (RF) - ContactsTerminal Blocks - Accessories - JumpersTerminals - PC Pin, Single Post ConnectorsCircular Connectors - Backshells and Cable ClampsTerminals - Spade ConnectorsD-Sub, D-Shaped Connectors - Accessories - JackscrewsTerminal Blocks - AdaptersCircular Connectors - ContactsTerminals - Quick Connects, Quick Disconnect ConnectorsFiber Optic ConnectorsContacts - Multi PurposePower Entry Connectors - AccessoriesTerminals - Specialized ConnectorsTerminal Blocks - Barrier BlocksBanana and Tip Connectors - Binding PostsRectangular Connectors - AdaptersTerminals - Screw ConnectorsD-Sub ConnectorsD-Sub, D-Shaped Connectors - AdaptersRectangular Connectors - Headers, Male PinsCircular Connectors - AccessoriesTerminal Blocks - Headers, Plugs and SocketsTerminal Blocks - AccessoriesCoaxial Connectors (RF) - TerminatorsTerminal Blocks - Power DistributionTerminals - AdaptersTerminal Blocks - Accessories - Wire FerrulesBetween Series AdaptersTerminals - Rectangular ConnectorsSolid State Lighting ConnectorsContacts, Spring Loaded and PressureTerminals - Wire Splice ConnectorsBlade Type Power Connectors - Contacts
Relays
- Automotive RelaysPower Relays, Over 2 AmpsSafety RelaysI/O Relay Module RacksContactors (Electromechanical)Reed RelaysSignal Relays, Up to 2 AmpsAccessoriesRelay SocketsSolid State Relays
Hardware, Fasteners, Accessories
- AccessoriesKnobsWashersNutsComponent Insulators, Mounts, SpacersScrews, BoltsMiscellaneousBumpers, Feet, Pads, GripsBearingsHole PlugsDIN Rail ChannelStructural, Motion HardwareBoard Spacers, StandoffsRivets
Resistors
- AccessoriesResistor Networks, ArraysSpecialized ResistorsChassis Mount ResistorsChip Resistor - Surface Mount
Integrated Circuits (ICs)
- PMIC - Hot Swap ControllersPMIC - Voltage Regulators - DC DC Switching RegulatorsEmbedded - Microcontroller, Microprocessor, FPGA ModulesPMIC - Lighting, Ballast ControllersInterface - Analog Switches - Special PurposeInterface - TelecomInterface - Sensor and Detector InterfacesPMIC - Voltage ReferenceEmbedded - FPGAs (Field Programmable Gate Array)PMIC - Voltage Regulators - LinearPMIC - SupervisorsLinear - Amplifiers - Instrumentation, OP Amps, Buffer AmpsPMIC - Power Distribution Switches, Load DriversPMIC - Gate DriversPMIC - Voltage Regulators - DC DC Switching ControllersPMIC - Power Supply Controllers, MonitorsPMIC - LED DriversInterface - SpecializedEmbedded - Microcontrollers - Application SpecificClock/Timing - Programmable Timers and OscillatorsSpecialized ICsInterface - Drivers, Receivers, TransceiversMemoryPMIC - Battery Management
Kits
- Connector KitsHeat Shrink Tubing KitsCircuit Protection Kits - FuseCircuit Protection Kits - TVS DiodesMiscellaneousCircuit Protection - Assortment KitsSensor KitsCable AssembliesInductor Kits
Optoelectronics
- Addressable, SpecialtyPanel Indicators, Pilot LightsLamps - Incandescents, NeonsLED Indication - DiscreteLEDs - Circuit Board Indicators, Arrays, Light Bars, Bar GraphsLED Lighting - WhiteOptics - LensesAccessoriesLED Lighting - COBs, Engines, Modules, Strips
Audio Products
- Alarms, Buzzers, and SirensAccessoriesSpeakers
Capacitors
- Ceramic CapacitorsMica and PTFE CapacitorsTrimmers, Variable CapacitorsAluminum Electrolytic CapacitorsElectric Double Layer Capacitors (EDLC), SupercapacitorsFilm CapacitorsCapacitor Networks, Arrays
Labels, Signs, Barriers, Identification
- Labels, Stickers, Decals - BlankSigns, Nameplates, PostersLabels, Stickers, Decals - PreprintedAccessoriesTagsLockouts, PadlocksBarriers, Barricades, Floor Markings, Tapes
Tools
- Wire CuttersCrimpers - Crimp Heads, Die SetsSpecialized ToolsHammersAccessoriesInsertion, ExtractionScrew and Nut Drivers - SetsSockets - SetsPliersFiber Optics and AccessoriesCrimpers, Applicators, PressesScrew and Nut DriversWrenchesScrew and Nut Drivers - Bits, Blades and HandlesChemicals, CleanersAbrasives and Surface Conditioning ProductsSockets, Socket HandlesHeat Guns, Torches, AccessoriesFlashlightsCrimpers, Applicators, Presses - AccessoriesHex, Torx KeysPersonal Protective Equipment (PPE)
Cable Assemblies
- USB CablesCircular Cable AssembliesBarrel - Power CablesFiber Optic CablesModular CablesBetween Series Adapter CablesRectangular Cable AssembliesSpecialized Cable Assemblies
Isolators
- Optoisolators - Transistor, Photovoltaic OutputIsolators - Gate DriversOptoisolators - Triac, SCR OutputOptoisolators - Logic OutputSpecial Purpose
Motors, Solenoids, Driver Boards/Modules
- Motor Driver Boards, ModulesStepper MotorsMotors - AC, DCSolenoids, Actuators
Inductors, Coils, Chokes
- Arrays, Signal TransformersFixed Inductors
Battery Products
- AccessoriesBattery Holders, Clips, Contacts
Transformers
- Power TransformersCurrent Sense Transformers
Boxes, Enclosures, Racks
- Card GuidesEvaluation, Development Board EnclosuresBoxesBox AccessoriesBox ComponentsHandlesRack AccessoriesRacks
Soldering, Desoldering, Rework Products
- Soldering Irons, Tweezers, HandlesSolderSoldering, Desoldering, Rework Tips, Nozzles
Potentiometers, Variable Resistors
- Trimmer PotentiometersAccessoriesScale DialsRotary Potentiometers, Rheostats
Tapes, Adhesives, Materials
- Tape DispensersGlue, Adhesives, ApplicatorsTape
Development Boards, Kits, Programmers
- Programming Adapters, SocketsEvaluation Boards - Expansion Boards, Daughter CardsEvaluation Boards - LED DriversAccessoriesEvaluation and Demonstration Boards and KitsSoftware, ServicesEvaluation Boards - SensorsEvaluation Boards - Embedded - MCU, DSP
RF/IF and RFID
- RF Evaluation and Development Kits, BoardsRFID Transponders, TagsRF AmplifiersRF Transceiver ModulesRF AntennasRFI and EMI - Shielding and Absorbing MaterialsRF Directional Coupler
Line Protection, Distribution, Backups
- DC to AC (Power) InvertersUninterruptible Power Supply (UPS) SystemsLine ConditionersPower Distribution, Surge Protectors
Test and Measurement
- Equipment - SpecialtyTest Clips - Alligator, Crocodile, Heavy DutyEquipment - MultimetersTest Leads - Thermocouples, Temperature ProbesTest PointsTest Leads - Kits, AssortmentsAccessoriesTest Probe Tips
Maker/DIY, Educational
- Robotics KitsWearablesEducational Kits
Computer Equipment
- Printers, Label MakersDesktop Joysticks, Simulation Products
Crystals, Oscillators, Resonators
- OscillatorsCrystals
Networking Solutions
- Switches, HubsMiscellaneous
Fans, Thermal Management
- Fans - AccessoriesThermal - Adhesives, Epoxies, Greases, PastesThermal - Liquid Cooling
Static Control, ESD, Clean Room Products
- Static Control Shielding Bags, MaterialsAccessoriesMonitors, Testers
Power Supplies - Board Mount
- AccessoriesDC DC Converters
Power Supplies - External/Internal (Off-Board)
- LED DriversAccessoriesAC DC Converters
Prototyping, Fabrication Products
- Adapter, Breakout Boards3D Printing Filaments
Optical Inspection Equipment
- Loupes, Magnifiers
Featured Products
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