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Littelfuse offers a broad portfolio of thermistors, resistance temperature detectors (RTDs), digital temperature indicators, and probes and assemblies to meet a wide range of demanding temperature sensing applications. Littelfuse also specializes in designing custom NTC thermistor and RTD sensors to meet unique system requirements. Each temperature sensor style has its own set of operating principles, features, benefits, considerations, and limitations for optimal use. Common applications include HVAC-R, renewable energy, appliances, food service, medical, and more.

TVS diode arrays protect electronics from damage due to transient voltage surges and electrostatic discharges (ESDs). Littelfuse offers a variety of these surge protective devices (SPDs) in SOIC, DIP, flipchip, and other designs. Our lightning SPDs direct massive voltage surges from lightning strikes on outdoor equipment to ground. Our ultra-low capacitance TVS diodes provide ESD protection to data ports and cables. We also make SPDs specifically for automotive applications. Find your solution in our Circuit Protection Products Selection Guide.

Rectifier diodes convert alternating current to direct current. You find the solid state switches in almost all electrical systems. For this reason, Littelfuse produces many types of low- and high-current rectifiers with a range of designs and performance characteristics. Consult our Power Semiconductor Product Catalog to decide if a D-Pak, Teccor^®, capsule-type, easy mount, or stud-type rectifier best serves your application.

Explore our full range of fuse types and sizes. As a leading manufacturer of electrical components, we offer a broad selection of fuse types, such as electrical and industrial fuses. Our industrial fuses are designed to deliver reliable overcurrent protection across a wide range of applications. From power and automotive fuses to axial, cartridge, surface-mount, specialty, and medium-voltage options, our solutions ensure safe and efficient current regulation for virtually any system or device.

SIDACtor protection thyristors prevent damage from transient voltage surges due to lightning strikes and ac power crosses. The surge protective devices also protect people and electronics from electrostatic discharges generated by human–machine interactions. These specialized silicon diodes for alternating current (SIDACs) join LED protectors as circuit protection products offered by Littelfuse. Consult our catalog to find a solution for your broadband, baseband, cellular, DS1, LCAS, SLIC, voice, or lighting application.

Littelfuse offers a variety of current transformers to detect phase currents, ground-fault currents, and low levels of earth-leakage currents before they cause serious damage. Installing one of our current transformers maximizes protection of electrical components.

Littelfuse offers advanced gate driver ICs designed to optimize the switching performance of IGBTs, MOSFETs, and SiC-MOSFETs in power electronics. Our gate driver solutions include IGBT drivers and optically isolated gate drivers engineered for fast turnoff and high-efficiency control. Ideal for use in inverters, rectifiers, and other solid-state applications, our gate drivers ensure precise, reliable operation across demanding conditions.

Reduce the risk of damage from short-lived and unpredictable voltage surges by installing durable gas discharge tubes (GDTs). The plasma-filled overvoltage protection devices absorb large amounts of current and redirect it to ground without producing frequencies that could incapacitate nearby components. These characteristics make GDTs essential surge protective devices for outdoor telecom equipment prone to lightning strikes. Littelfuse offers a broad selection of leaded and surface mounted GDTs for many applications. Each boasts a minimal footprint and low weight, and our squared GDT is among the smallest available.

Littelfuse offers proven, reliable overcurrent solutions. Our global reputation is built from years of engineering and design expertise. Our fuses and devices safeguard sensitive electronic systems. From automotive to industrial applications, our products meet global standards, protecting equipment worldwide.

Varistors provide transient voltage surge suppression in consumer electronics, household appliances, telecom equipment, and computers. The overvoltage protection devices shield semiconductors and other components from damage due to lightning strikes, and electrostatic discharges. Littelfuse produces metal oxide varistors (MOVs) in surface mount, thermally protected, and radial leaded configurations. In addition to AUMOV^®, UltraMOV^®, and TMOV^® devices, we design specialty varistors to customers’ specifications.

Protecting electrical equipment from transient voltage surges prevents outages and reduces maintenance. Littelfuse offers several surge protectors to limit damage from lightning and overvoltage that may occur when equipment is switched on. Our varistor modules provide overvoltage protection for outdoor equipment and LEDs. Our globally compliant Type 2 SPDs plug in to generators, motors, and telecom and computer equipment. Consult our Surge Protection Devices Catalog to find your best solution.

Littelfuse offers a comprehensive range of silicon and silicon carbide MOSFETs engineered for high-efficiency current conversion, switching, and power factor correction (PFC). Our portfolio includes discrete power MOSFETs and MOSFET modules suited for rectifiers, inverters, and PFC circuits. With a wide selection of MOSFET packages and configurations, we provide both off-the-shelf and custom-designed solutions to meet the unique needs of industrial and commercial power systems.

Reed switches open and close circuits based on signals received from magnetic sensors. The electromechanical switches themselves often form integral components of liquid level sensors used in industrial controls, coolant systems, and air conditioners. When signaled, a normally open switch closes a circuit to initiate an automated process or trigger an alarm. Littelfuse makes a broad array of reed switches in bare glass and overmolded packages. Each of our liquid level sensing reed switches works with a floating actuator magnet and is engineered to withstand harsh operating conditions.

Ground-fault relays help protect people from injuries and prevent damage to electrical equipment. Littelfuse produces relays for grounded and ungrounded systems. The units work by detecting slight deviations in current, voltage, resistance, or temperature. When conditions for a ground fault exist, our relays trigger alarms or trip circuit breakers.

Diodes for power supply applications require low reverse recovery times and low forward voltage drops. Each discrete diode produced by Littelfuse boasts these characteristics, as well as low leakage. Our rectifier, ultrafast rectifier, fast recovery, and silicon Schottky diodes offer optimal switching solutions for dc–dc converters, induction heaters, and ultrasonic cleaners and welders. The Schottky devices are especially suited for use in EVs. Consult our Power Semiconductor Product Catalog to find the diode you require.

Transient voltage suppressor (TVS) diodes defend against damage from overvoltage events by responding within picoseconds to shunt current to ground. The classic example of TVS diode use is protecting outdoor telecom equipment from lightning strikes. Littelfuse produces surface mount and leaded diodes and TVS diode arrays for that, as well as TVS diodes for cars, personal electronics, data cables, and household appliances. Consult our Circuit Protection Selection Guide to guide your search for a solution.