Littelfuse Inc. 250R180MR

The "Mounting Type" in electronic components refers to the method used to attach or connect a component to a circuit board or other substrate, such as through-hole, surface-mount, or panel mount.

refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.

having leads that are designed to be soldered on the side of a circuit board that the body of the component is mounted on.

Terminal Shape in electronic components refers to the physical design of the connection points on the component that allow for electrical connections to be made. These terminals can come in various shapes such as pins, leads, pads, or terminals with specific configurations like surface mount or through-hole. The terminal shape is important as it determines how the component can be mounted on a circuit board or connected to other components. Different terminal shapes are used based on the specific requirements of the electronic circuit design and manufacturing process.

The operating temperature is the range of ambient temperature within which a power supply, or any other electrical equipment, operate in. This ranges from a minimum operating temperature, to a peak or maximum operating temperature, outside which, the power supply may fail.

Semiconductor package is a carrier / shell used to contain and cover one or more semiconductor components or integrated circuits. The material of the shell can be metal, plastic, glass or ceramic.

In electronic components, the "Series" refers to a group of products that share similar characteristics, designs, or functionalities, often produced by the same manufacturer. These components within a series typically have common specifications but may vary in terms of voltage, power, or packaging to meet different application needs. The series name helps identify and differentiate between various product lines within a manufacturer's catalog.

In electronic components, the parameter "Size / Dimension" refers to the physical dimensions of the component, such as its length, width, and height. These dimensions are crucial for determining how the component will fit into a circuit or system, as well as for ensuring compatibility with other components and the overall design requirements. The size of a component can also impact its performance characteristics, thermal properties, and overall functionality within a given application. Engineers and designers must carefully consider the size and dimensions of electronic components to ensure proper integration and functionality within their designs.

The "JESD-609 Code" in electronic components refers to a standardized marking code that indicates the lead-free solder composition and finish of electronic components for compliance with environmental regulations.

The "Pbfree Code" parameter in electronic components refers to the code or marking used to indicate that the component is lead-free. Lead (Pb) is a toxic substance that has been widely used in electronic components for many years, but due to environmental concerns, there has been a shift towards lead-free alternatives. The Pbfree Code helps manufacturers and users easily identify components that do not contain lead, ensuring compliance with regulations and promoting environmentally friendly practices. It is important to pay attention to the Pbfree Code when selecting electronic components to ensure they meet the necessary requirements for lead-free applications.

Parts can have many statuses as they progress through the configuration, analysis, review, and approval stages.

Moisture Sensitivity Level (MSL) is a standardized rating that indicates the susceptibility of electronic components, particularly semiconductors, to moisture-induced damage during storage and the soldering process, defining the allowable exposure time to ambient conditions before they require special handling or baking to prevent failures

Termination in electronic components refers to the practice of matching the impedance of a circuit to prevent signal reflections and ensure maximum power transfer. It involves the use of resistors or other components at the end of transmission lines or connections. Proper termination is crucial in high-frequency applications to maintain signal integrity and reduce noise.

An ECCN (Export Control Classification Number) is an alphanumeric code used by the U.S. Bureau of Industry and Security to identify and categorize electronic components and other dual-use items that may require an export license based on their technical characteristics and potential for military use.

Resistance is a fundamental property of electronic components that measures their opposition to the flow of electric current. It is denoted by the symbol "R" and is measured in ohms (Ω). Resistance is caused by the collisions of electrons with atoms in a material, which generates heat and reduces the flow of current. Components with higher resistance will impede the flow of current more than those with lower resistance. Resistance plays a crucial role in determining the behavior and functionality of electronic circuits, such as limiting current flow, voltage division, and controlling power dissipation.

Terminal Finish refers to the surface treatment applied to the terminals or leads of electronic components to enhance their performance and longevity. It can improve solderability, corrosion resistance, and overall reliability of the connection in electronic assemblies. Common finishes include nickel, gold, and tin, each possessing distinct properties suitable for various applications. The choice of terminal finish can significantly impact the durability and effectiveness of electronic devices.

Any Feature, including a modified Existing Feature, that is not an Existing Feature.

HTS (Harmonized Tariff Schedule) codes are product classification codes between 8-1 digits. The first six digits are an HS code, and the countries of import assign the subsequent digits to provide additional classification. U.S. HTS codes are 1 digits and are administered by the U.S. International Trade Commission.

The packing method in electronic components refers to the technique used to package and protect the component during shipping and handling. It encompasses various forms including tape and reel, tray, tube, or bulk packaging, each suited for different types of components and manufacturing processes. The choice of packing method can affect the ease of handling, storage, and the efficiency of assembly in automated processes. Additionally, it plays a crucial role in ensuring the reliability and integrity of the components until they are used in electronic devices.

Current rating is the maximum current that a fuse will carry for an indefinite period without too much deterioration of the fuse element.

The parameter "Approval Agency" in electronic components refers to the organization responsible for testing and certifying that a component meets specific safety, quality, and performance standards. These agencies evaluate products to ensure compliance with industry regulations and standards, providing assurance to manufacturers and consumers. Approval from recognized agencies can enhance a component's marketability and acceptance in various applications, particularly in sectors like automotive, aerospace, and healthcare. Common approval agencies include Underwriters Laboratories (UL), International Electrotechnical Commission (IEC), and the American National Standards Institute (ANSI).

Lead pitch in electronic components refers to the distance between the center of one lead (or pin) of a component to the center of the adjacent lead. It is an important parameter to consider when designing and assembling electronic circuits, as it determines the spacing required on a circuit board for proper placement and soldering of the component. Lead pitch is typically specified in millimeters or inches and can vary depending on the type of component, such as integrated circuits, resistors, capacitors, and connectors. Choosing the correct lead pitch ensures proper alignment and connection of components on a circuit board, ultimately affecting the functionality and reliability of the electronic device.

The voltage level by which an electrical system is designated and to which certain operating characteristics of the system are related.

the distance between two baselines of lines of type. The word 'leading' originates from the strips of lead hand-typesetters used to use to space out lines of text evenly. The word leading has stuck, but essentially it's a typographer's term for line spacing.

The "Max Current Rating" parameter in electronic components refers to the maximum amount of electrical current that the component can safely handle without being damaged. It is an important specification to consider when designing or selecting components for a circuit, as exceeding the maximum current rating can lead to overheating, malfunction, or even permanent damage to the component. The max current rating is typically provided in amperes (A) and is determined by the component's internal construction, materials used, and thermal characteristics. It is crucial to ensure that the current flowing through the component does not exceed this specified limit to maintain the component's reliability and longevity.

the process by which an electronic or electrical device produces heat (energy loss or waste) as an undesirable derivative of its primary action.

The parameter "Max Voltage Rating (DC)" in electronic components refers to the maximum direct current (DC) voltage that the component can safely handle without being damaged. This rating is crucial for ensuring the proper functioning and longevity of the component within an electrical circuit. Exceeding the maximum voltage rating can lead to breakdown or failure of the component, potentially causing damage to the entire circuit. It is important to carefully consider and adhere to the specified max voltage rating when designing or working with electronic circuits to prevent any potential risks or malfunctions.

The parameter "Rated (AC) Voltage (URac)" in electronic components refers to the maximum alternating current (AC) voltage that the component is designed to safely operate at continuously. This rating is important for ensuring the component's reliability and longevity under normal operating conditions. Exceeding the rated voltage can lead to overheating, insulation breakdown, and potential failure of the component. It is crucial to adhere to the specified rated voltage to prevent damage and ensure proper functioning of the electronic component within its intended application.

the minimum current which must pass through a circuit in order for it to remain in the 'ON' state.

The parameter "Current - Hold (Ih) (Max)" in electronic components refers to the maximum current required to maintain the component in a latched or on-state after it has been triggered. This parameter is commonly associated with relays, switches, and other devices that have a latching function. It is important because it determines the minimum current that must be supplied to keep the component in its activated state, ensuring reliable operation. Exceeding the maximum Ih value can lead to the component failing to hold its state, potentially causing malfunctions or disruptions in the circuit.

Thermistor Application in electronic components refers to the use of thermistors, which are temperature-sensitive resistors, in various circuits and systems. These components change resistance with temperature variations, allowing them to be used for temperature sensing, compensation, and control. Common applications include temperature measurement in HVAC systems, automotive temperature monitoring, and household appliances. Their fast response times and high sensitivity make them suitable for precise temperature regulation in various electronic devices.

Voltage - Max is a parameter in electronic components that specifies the maximum voltage that can be safely applied to the component without causing damage. This parameter is crucial for ensuring the proper functioning and longevity of the component. Exceeding the maximum voltage rating can lead to breakdown or failure of the component, potentially causing damage to the entire circuit or system. It is important to always operate electronic components within their specified voltage limits to prevent any issues and ensure reliable performance.

Time to Trip is a parameter used in electronic components, particularly in circuit protection devices such as fuses and circuit breakers. It refers to the amount of time it takes for the component to activate and interrupt the circuit when a fault or overcurrent condition is detected. This parameter is crucial for ensuring the safety and reliability of the electrical system by quickly disconnecting power in case of a fault to prevent damage to the components or potential hazards such as fires. The specific time to trip value can vary depending on the application and the level of protection required, with faster trip times being more critical in certain high-risk environments.

Resistance - Initial (Ri) (Min) refers to the minimum resistance value measured across the terminals of an electronic component when it is first tested. This parameter helps determine the baseline performance of the component under nominal conditions. It is crucial for identifying any defects or inconsistencies in the component's manufacturing process. A low initial resistance value may indicate potential issues affecting the component's functionality.

Resistance - Post Trip (R1) (Max) refers to the maximum resistance value measured across the terminals of an electronic component after it has undergone a trip event, such as a thermal or overcurrent protection activation. This parameter indicates the state of the component post-fault condition, helping to assess whether it can return to normal operation. It is crucial for assessing the reliability and safety of components in circuits, ensuring they do not exhibit failure modes that could lead to further issues.

the current at which the device is guaranteed to trip.

Height Seated (Max) is a parameter in electronic components that refers to the maximum allowable height of the component when it is properly seated or installed on a circuit board or within an enclosure. This specification is crucial for ensuring proper fit and alignment within the overall system design. Exceeding the maximum seated height can lead to mechanical interference, electrical shorts, or other issues that may impact the performance and reliability of the electronic device. Manufacturers provide this information to help designers and engineers select components that will fit within the designated space and function correctly in the intended application.

The parameter "REACH SVHC" in electronic components refers to the compliance with the Registration, Evaluation, Authorization, and Restriction of Chemicals (REACH) regulation regarding Substances of Very High Concern (SVHC). SVHCs are substances that may have serious effects on human health or the environment, and their use is regulated under REACH to ensure their safe handling and minimize their impact.Manufacturers of electronic components need to declare if their products contain any SVHCs above a certain threshold concentration and provide information on the safe use of these substances. This information allows customers to make informed decisions about the potential risks associated with using the components and take appropriate measures to mitigate any hazards.Ensuring compliance with REACH SVHC requirements is essential for electronics manufacturers to meet regulatory standards, protect human health and the environment, and maintain transparency in their supply chain. It also demonstrates a commitment to sustainability and responsible manufacturing practices in the electronics industry.

RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.

Lead Free is a term used to describe electronic components that do not contain lead as part of their composition. Lead is a toxic material that can have harmful effects on human health and the environment, so the electronics industry has been moving towards lead-free components to reduce these risks. Lead-free components are typically made using alternative materials such as silver, copper, and tin. Manufacturers must comply with regulations such as the Restriction of Hazardous Substances (RoHS) directive to ensure that their products are lead-free and environmentally friendly.