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littelfuse

littelfuse

Littelfuse, Inc., founded in 1927 and headquartered in Chicago, Illinois, USA, is a global leader in circuit protection, power control, and sensing technologies. The company serves virtually every market that uses electrical energy, including automotive, industrial equipment, consumer electronics, and commercial vehicles. Its core product portfolio features the industry’s broadest and deepest range of circuit protection devices, such as automotive blade fuses (ATO, Mini, Maxi series), resettable polymeric positive temperature coefficient (PPTC) devices (PolySwitch series), metal oxide varistors (MOVs), transient voltage suppression (TVS) diodes (SPA and SMBJ families), and electrostatic discharge (ESD) protection arrays. Littelfuse also offers a growing lineup of power semiconductors including silicon carbide (SiC) MOSFETs, rectifiers, and gate drivers, alongside electromechanical sensors like reed switches and Hall effect speed sensors for automotive applications. The company has expanded into heavy-duty switches for commercial vehicles, power distribution centers for mining, and generator control and protection equipment for marine applications. With decades of proven technical e

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Product Categories

Connector Solutions(761)

Integrated Circuits(3,589)

Resistors and Potentiometers(3)

Circuit Protection Solutions(42,172)

Inductor Components(83)

Frequency Control Components(4)

RF and Wireless Solutions(71)

Testing, Inspection, and Prototyping Solutions(13)

Basic Electronic Products(53)

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SERIES

产品系列共 1,766 个系列

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600R150 thermistor

The 600R150 thermistor series from Littelfuse is a line of resettable fuses designed for circuits that require overcurrent protection without the need for manual replacement. These devices are essentially temperature-sensitive components that open a circuit when they exceed a certain temperature threshold, then automatically reset once the temperature drops back to normal levels. This makes them ideal for applications where downtime needs to be minimized and frequent replacements are impractical. Engineers tend to reach for these resettable fuses when working on power supplies, industrial control systems, or any circuit that might experience transient overloads or thermal issues. They are particularly useful in consumer electronics, automotive systems, and HVAC equipment where space constraints and reliability are key considerations. One practical observation is that the 600R150 series offers a wide range of current ratings, allowing for precise matching to specific application requirements. Another useful aspect is their ability to repeatedly cycle through heating and cooling without degradation, making them a long-term solution for protecting sensitive electronic components. If y

A2106UA thyristor

The A2106UA series from Littelfuse includes both SIDAC and SIDACTOR components, designed for applications requiring high-voltage triggering and protection. These thyristors are commonly found in systems that need precise control over electrical circuits, such as AC motor drives, power supplies, and surge protection circuits. SIDACs (Silicon Controlled Alternating Current Switches) are particularly useful in AC systems where you need to trigger a circuit at specific points in the AC waveform. They’re often used in phase control applications, where controlling the firing angle of a thyristor can regulate the output voltage or current. Engineers tend to reach for SIDACs when they need reliable triggering without the need for complex synchronization circuits. SIDACTORS, on the other hand, combine the functionality of a SIDAC with a built-in RC snubber network, which helps to suppress voltage spikes and improve the overall performance and reliability of the circuit. This makes them ideal for applications where transient voltage events are common, such as in surge protection systems or in industrial control panels. One practical observation is that these components can significantly redu

B1161UA surge suppressor

The B1161UA surge suppressor series from Littelfuse is designed to protect electronic circuits from voltage spikes and transients. These components are crucial in any system that needs to handle fluctuating power conditions, such as industrial machinery, data centers, and residential electrical systems. If you're working on projects involving sensitive electronics that could be damaged by transient overvoltages, these surge suppressors are a go-to solution. They help ensure that your equipment remains operational even during sudden power surges, which can be common in environments with poor power quality or during lightning storms. One thing worth noting is their ability to handle both transient overvoltage events and continuous power supply. This dual functionality makes them versatile enough for a wide range of applications without needing separate components for different protection needs. Engineers tend to reach for this when they need reliable surge protection that can withstand repeated stress without degradation in performance. Another practical observation is that these suppressors often come with multiple stages of protection, providing a robust defense against various typ

B1201UC surge suppressor

The B1201UC surge suppressor from Littelfuse is part of their Battrax series, designed to protect electrical systems from voltage spikes and surges. If you're working on projects that involve sensitive electronic equipment, like data centers, telecommunications infrastructure, or industrial control systems, these suppressors can be a game-changer in preventing damage from transient voltages. One thing worth noting is that these devices come in different current ratings, which makes them versatile for a wide range of applications. For instance, the B1201UC might be used in systems requiring a higher current rating compared to some of their lower-capacity counterparts. Engineers tend to reach for this when they need reliable protection against overvoltage events without compromising system performance. Another practical observation is that these surge suppressors often have built-in diagnostic features, such as indicator lights or status LEDs, which can help monitor the health of the suppressor and alert maintenance personnel to potential issues before they become critical. This proactive approach can save a lot of downtime and costly repairs down the line

B3164 surge suppressor

The B3164 surge suppressor series from Littelfuse, Inc., is designed to protect electrical circuits from voltage surges and transient overvoltages. These devices are particularly useful in environments where electrical storms or power fluctuations can cause significant damage to sensitive equipment. If you're working on projects involving telecommunications infrastructure, industrial control systems, or even residential power distribution, these surge suppressors are a key component to consider. One thing worth noting is that the B3164 series includes both surge suppressors and Sidacs (Silicon Controlled Diodes). This dual functionality allows for more versatile protection schemes. Engineers tend to reach for this when they need robust protection against transient events without compromising on performance or reliability. The ability to handle high current surges makes them ideal for applications where lightning strikes or other transient phenomena could pose a threat to the integrity of the circuit. Another practical benefit is their ease of integration into existing designs. They come in a variety of package sizes, which means they can fit into tight spaces while still providing

CCMR05 fuse

The CCMR05 fuse series from Littelfuse is designed for time-delay applications in industrial settings. These fuses are particularly useful in scenarios where a momentary overload might occur, allowing the circuit to continue operating without tripping until the overload persists long enough to cause a failure. This characteristic makes them ideal for motor protection, where they can handle initial startup surges but will cut power if the fault condition continues. If you're working on any industrial system that involves motors or other devices prone to temporary overloads, these fuses are a solid choice. One thing worth noting is their robustness; they can withstand harsh environments and are often used in outdoor or high-vibration applications. Engineers tend to reach for this when they need a reliable, cost-effective solution that can handle both normal operation and occasional faults without frequent false trips. Another practical benefit is their ease of installation and replacement, which simplifies maintenance in large-scale industrial installations

MCK500 Module

The MCK500 Module series from Littelfuse is designed for high-power switching applications, particularly in industrial and power electronics systems. These modules are essentially thyristors packaged in robust heatsinks, making them ideal for scenarios where precise control over large currents is required. If you're working on motor drives, inverters, or any system that needs to handle significant electrical loads with fast response times, these modules will likely be on your radar. One thing worth noting is the thermal management aspect. The MCK500 Modules come with built-in heatsinks, which helps manage the heat generated during operation. This is crucial in applications where the module might be running continuously or under heavy load, ensuring reliable performance without overheating. Engineers tend to reach for this when they need a compact solution that can handle high currents and provide fast switching capabilities, all while maintaining stability and efficiency

MCM229 Fuse

The MCM229 fuse series from Littelfuse is a line of subminiature slow-blow fuses designed for 250V circuits. These fuses are ideal for protecting low-power electronic devices and small circuits where space is at a premium. If you're working on projects that require precise current protection without the need for immediate tripping, these fuses are a great choice. One thing worth noting is their slow-blow characteristic, which allows them to tolerate transient overcurrent conditions without immediately blowing, thereby protecting sensitive electronics from false trips. Engineers tend to reach for this when they need reliable circuit protection in tight spaces, such as in compact consumer electronics, automotive applications, or industrial control panels. Their small footprint makes them particularly suitable for boards with limited real estate. Another practical use case is in power supplies where you want to protect against momentary overloads but still have fast response times in case of prolonged faults. The MCM229 series offers a balance between protection and performance, making them a go-to component in many low-voltage, high-density applications

MCM312 Fuse

The MCM312 fuse series from Littelfuse is a lineup of miniature fast-acting fuses designed for 250V circuits, typically found in cartridge holders. These fuses are ideal for a variety of electrical installations where quick protection against overcurrent is critical. If you're working on residential or light commercial projects that require reliable circuit protection without the bulkiness of larger fuses, the MCM312 series is a go-to choice. One thing worth noting is their fast-acting characteristic, which means they can quickly interrupt fault currents, thereby minimizing the risk of fire or damage to connected equipment. Engineers tend to reach for this when they need a compact solution that can handle sudden spikes in current efficiently. Another practical observation is their ease of installation and replacement, thanks to the cartridge holder design. This makes them particularly handy for maintenance and repair work, where quick access to individual circuits is essential. Overall, the MCM312 series provides a robust and space-efficient solution for circuit protection in a wide range of low-voltage applications

MDD44 semiconductor

The MDD44 series from Littelfuse is a high-power dual diode module designed for applications requiring robust current handling and voltage ratings. These modules come in a TO-240AA package, which is known for its thermal performance and ease of use. If you're working on projects involving power electronics, inverters, or any system that needs to handle significant current and voltage, these modules could be a good fit. One thing worth noting is their flexibility in voltage applications. The MDD44 series can be used across a wide range of voltages, making them versatile for different designs. Engineers tend to reach for this when they need reliable diode functionality without the hassle of integrating separate components. Additionally, the TO-240AA package helps in managing heat effectively, which is crucial for maintaining performance and longevity in high-power applications

MDD310 semiconductor

The MDD310 series from Littelfuse is a high-power dual diode module designed for industrial semiconductor applications. These modules are typically used in power electronics where high current handling and fast switching are critical. If you're working on inverters, motor drives, or any system requiring efficient power conversion, you'll likely encounter these components. One thing worth noting is their robustness under harsh conditions. They can handle significant surge currents and operate effectively in environments with high temperatures and electromagnetic interference. Engineers tend to reach for this when they need reliable performance in demanding industrial settings where other diodes might struggle. Another practical use is in renewable energy systems, such as solar inverters, where the ability to manage high power levels efficiently is crucial. The MDD310 series also excels in applications requiring fast recovery times, making them ideal for high-frequency switching circuits. Their compact design allows for easy integration into existing designs without compromising on performance. Overall, these modules offer a balanced mix of power handling capabilities and reliability

CY22X58G specialty fuse

The CY22X58G series from Littelfuse is a cylindrical 500V cartridge fuse designed for use in a euro-style housing. These fuses are commonly found in power distribution panels, motor control centers, and other industrial applications where high-voltage protection is necessary. If you're working on projects that require reliable overcurrent and short-circuit protection in a compact form factor, these fuses are a go-to choice. One thing worth noting is their Euro-style housing, which makes them easily interchangeable with similar fuses from different manufacturers, ensuring compatibility across various systems. Engineers tend to reach for this series when they need a robust solution that can handle high currents without sacrificing space. Another practical benefit is their ability to withstand multiple interruptions, making them ideal for applications where frequent tripping could be an issue. Overall, the CY22X58G series offers a solid blend of performance and reliability, making it a staple in many industrial and commercial installations

D0Z18G specialty fuse

The D0Z18G specialty fuse from Littelfuse is designed for high-voltage applications in European electrical systems, particularly those operating at 230VAC or higher. These fuses are commonly used in residential and commercial settings where robust protection against overcurrent and short circuits is critical. If you're working on projects involving large appliances, lighting systems, or industrial equipment in Europe, these fuses are a reliable choice. One thing worth noting is their Neozed technology, which allows for faster response times compared to traditional fuses. This is particularly useful in preventing damage from transient events and ensuring the safety of both the system and its users. Engineers tend to reach for these fuses when they need a high-capacity solution that can handle the specific voltage and current requirements of European electrical standards without compromising on performance or safety. Additionally, their compact design makes them easy to integrate into existing systems without requiring significant modifications

DZ27F specialty fuse

The DZ27F series from Littelfuse is designed for 380-500V AC applications, specifically using the Diazed-style fuse format. These fuses are commonly found in industrial settings, such as motors, drives, and transformers, where robust protection against overcurrent is crucial. If you're working on high-voltage circuits that need reliable circuit protection without the complexity of higher-end solutions, these fuses are a solid choice. One thing worth noting is their compact size; despite their robust performance, they fit neatly into tight spaces, making them ideal for panel boards and switchgear. Engineers tend to reach for this when they need a balance between cost and performance, especially in applications where space is at a premium but reliability isn’t negotiable. Another practical observation is their fast-blow characteristic, which helps protect sensitive equipment by quickly interrupting the circuit in case of a fault, thereby minimizing damage and downtime

DZ2700 fuses & fuse holder

The DZ2700 series from Littelfuse features color-coded gauge rings for their 500V fuse holders. These rings are designed to make it easy to quickly identify the type of fuse installed in a given holder without needing to remove the fuse itself. If you're working on systems that require frequent checks or maintenance, these gauge rings can significantly streamline the process, reducing downtime and improving efficiency. One thing worth noting is that these gauge rings come in a variety of colors, each corresponding to a specific fuse type. This makes it easy to spot potential issues during routine inspections. Engineers tend to reach for this when they need a quick visual check of the fuse status in a panel or enclosure. Another practical benefit is that the rings help prevent misinstallation, ensuring that only the correct fuse is placed into the holder, which is crucial for safety and system reliability. The color-coding also aids in compliance with industry standards, making it easier to adhere to best practices and regulatory requirements. In complex electrical systems, especially those involving multiple types of fuses, the DZ2700 gauge rings can be a game-changer, providing a

MKE38 transistor

The MKE38 series from Littelfuse is a lineup of high-power N-channel MOSFETs designed for demanding applications where reliability and performance are critical. These transistors are commonly used in power supply designs, motor control circuits, and other high-current switching applications. If you're working on projects that require handling currents above 50A and voltages up to 60V, these MOSFETs are a solid choice. One thing worth noting is their robustness. The MKE38 series is built to withstand high dv/dt and di/dt conditions, making them suitable for applications where transient voltage spikes are common. Engineers tend to reach for this when they need a reliable switch that can handle significant load variations without failing. Another practical benefit is their low on-resistance, which helps minimize power losses and improve efficiency in high-current circuits. Overall, if your project involves high-power switching and you need a component that can handle the heat, the MKE38 series is definitely worth considering

FLNR04 industrial & electrical fuse

The FLNR04 series from Littelfuse is a line of Class RK5 time-delay fuses designed for industrial electrical protection. These fuses are specifically engineered to handle inrush currents without tripping, which makes them ideal for use in motors, transformers, and other equipment that experience significant initial current spikes during startup. If you're working on projects involving heavy machinery or industrial automation, these fuses could be a valuable addition to your toolkit. One thing worth noting is how they manage to provide reliable overcurrent protection while minimizing nuisance tripping. This is particularly useful in environments where frequent startups and shutdowns are common. Engineers tend to reach for this type of fuse when they need a balance between robust protection and operational efficiency. Another practical benefit is their ability to withstand multiple inrush events without needing replacement, which can significantly reduce maintenance costs and downtime. The FLNR04 series is known for its durability and performance under harsh conditions, making it a go-to choice for applications where reliability and longevity are critical. Whether you're dealing with

FLNR07 industrial & electrical fuse

The FLNR07 series from Littelfuse is a dual-element time-delay fuse designed for industrial electrical protection. These fuses consist of two elements: a primary element that provides instantaneous protection against short circuits and a secondary element that offers time-delayed blowout for overloads. This design allows the primary element to handle short-term overcurrent conditions without tripping, while the secondary element ensures protection against prolonged overload scenarios. These fuses show up in a variety of industrial applications, such as motor control centers, machinery, and power distribution systems. Engineers tend to reach for this type of fuse when they need a reliable solution that can differentiate between a momentary fault and an actual overload condition. For instance, in a motor starter circuit, the primary element can handle the initial inrush current without tripping, while the secondary element can protect the system from overheating due to an overloaded motor. One practical observation is that these fuses can significantly reduce the number of false trips compared to single-element fuses. This reduces downtime and maintenance costs by ensuring that only

FLSR02 industrial & electrical fuse

The FLSR02 series from Littelfuse is a line of Class RK5 slow-blow fuses designed for industrial electrical protection applications. These fuses are specifically engineered to handle inrush currents without immediate tripping, which makes them ideal for motors, transformers, and other equipment that experience high initial current draws during startup. If you're working on projects involving these types of loads, these fuses can be a reliable choice. One thing worth noting is their ability to provide protection against overcurrent conditions without interrupting the circuit during normal operation. This characteristic is particularly useful in industrial settings where downtime due to false trips can be costly. Engineers tend to reach for this type of fuse when they need a balance between robust protection and operational reliability. Additionally, the slow-blow feature helps in protecting sensitive electronic components by allowing momentary overcurrents to pass through without tripping the fuse, thereby extending the lifespan of connected devices

H3453LS Fuse

The H3453LS fuse from Littelfuse is a panel-mounted quick connect fuse holder designed for 20A 250V applications. This series is commonly used in electrical panels and distribution boards where quick access to fuses is necessary. If you're working on projects that require reliable protection against overcurrent without interrupting service, this fuse holder is a solid choice. One thing worth noting is its quick connect feature, which allows for easy installation and replacement without tools, saving time during maintenance. Engineers tend to reach for this when they need a straightforward solution for protecting circuits while maintaining ease of use in the field. It’s particularly useful in industrial settings, residential breaker panels, and commercial building electrical systems where quick fault clearance and minimal downtime are critical