Detailed explanation of patch self-restoring fuse screen printing comparison table

With the miniaturization and intelligence of electronic products, chip resettable fuses (PTC fuses) are widely used in various circuit protection due to their automatic power-off protection and recovery functions. In order to facilitate identification and selection, SMD resettable fuses usually have silk screen codes printed on the surface. This article will introduce in detail the SMD self-restoring fuse screen printing comparison table to help engineers and purchasing personnel quickly and accurately identify product parameters, so as to select appropriate protection components.

The chip resettable fuse is a protective component with a positive temperature coefficient (PTC) effect. When an overcurrent occurs in the circuit, its internal resistance increases rapidly, limiting the flow of current to achieve protection; after the fault is resolved, the component resistance can automatically return to its original state. The silk screen code is the logo printed on the surface of the fuse by the manufacturer, which contains information such as rated current, rated voltage, size and model, and is an important basis for selection and replacement.

Silk screen codes generally consist of numbers and letters, representing different parameters. The numerical part is mostly the rated current value, such as "080" indicating 0.8A; the letters may represent the package size or series model. For example, "F" stands for fast response type and "S" stands for standard type. Understanding the rules of code composition can help you quickly judge product performance.

SMD resettable fuses are available in a variety of package sizes, such as 1206, 0805, 0603, etc. There are usually differences between different sizes of silk screen codes. Taking the 1206 size as an example, the silk screen "120" usually indicates 1.2A rated current; in the 0805 size, the silk screen "080" indicates 0.8A. Mastering the corresponding relationship between size and silk screen printing is helpful for accurate selection during PCB design and component replacement.

Rated current is one of the most critical parameters of chip resettable fuses. The number part in the silk screen usually represents the rated current in amperes (A). For example, "050" represents 0.5A, and "150" represents 1.5A. Different manufacturers may have slight differences, but generally follow this rule. You can quickly confirm the rated current of the fuse through the comparison table to avoid protection failure due to incorrect selection.

Although the rated voltage in the silk screen code may not be directly reflected, some series will indicate the rated voltage level through letters or additional logos. Common rated voltages are 6V, 12V, 24V, etc. When selecting, the silk screen code and product specifications should be combined to ensure that the rated voltage of the selected fuse meets the circuit requirements.

Each brand's SMD self-restoring fuse screen printing system is slightly different. For example, Bourns, Littelfuse, Murata and other brands have different silk screen coding rules. When using it, engineers should refer to the screen printing comparison table of the corresponding brand to avoid confusion and ensure the correct model is selected.

When using the silk screen comparison table, first confirm the silk screen code on the surface of the chip fuse, and then look for the rated current, size and series information according to the corresponding parameter column. It is recommended to combine the product specifications and manufacturer's data manual at the same time to make a comprehensive judgment. At the same time, please note that the silk screen may be blurred due to process limitations. If necessary, you can confirm by measuring or asking the supplier.

As new products are continuously introduced, the silk screen codes will be updated. It is recommended that enterprises and engineers regularly pay attention to the brand's official website and technical documents to obtain the latest silk screen comparison table. At the same time, an internal database is established to facilitate quick query and training of new employees.

The SMD resettable fuse screen printing comparison table is an important tool for identifying and selecting SMD PTC fuses. By understanding the core contents such as the composition of the silk screen code, size model, rated current and voltage, we can effectively improve the selection efficiency and ensure circuit safety. There are differences in the screen printing systems of different brands, and the specific manufacturer's information needs to be used when using them. Regularly updating and maintaining the screen printing comparison table helps to maintain technological leadership and ensure product quality and reliability. Mastering the SMD self-restoring fuse screen printing comparison table is an indispensable basic knowledge in the field of electronic design and manufacturing.