Detailed explanation of screen printing code for SMD self-restoring fuse

As electronic products continue to develop towards miniaturization and high integration, chip resettable fuses (Polyfuse), as an important protection component, are widely used in various circuits. In order to facilitate identification and selection, chip resettable fuses usually have silk screen codes printed on their surfaces. This article will introduce the silk screen code of the chip resettable fuse in detail to help readers better understand and apply this key parameter.

The screen-printed code for chip resettable fuses is a set of letters and numbers printed on the surface by the manufacturer in order to distinguish fuses with different specifications and parameters.通过这些代码，用户可以快速识别产品的额定电流、额定电压、响应时间等重要性能指标，避免选型错误。

Generally speaking, the silk screen code of the SMD resettable fuse consists of letters and numbers, with common formats such as "R05", "F1", "P6", etc. The letter part usually represents the product series or type, and the numerical part indicates the rated current or rated voltage. For example, "R05" represents a product with a rated current of 0.5A.

Rated current is one of the most important information in the silk screen code. Most manufacturers use numbers to directly represent the current, such as "05" representing 0.5A and "10" representing 1A. Some manufacturers will also combine letters to identify different response characteristics, such as fast blowing or slow blowing.

Chip resettable fuses are divided into fast type and delay type according to different response times. The letters in the silk screen code are usually used to distinguish. For example, "F" represents fast type (Fast), which is suitable for instant overload protection; "P" represents delay type (Power), which is suitable for protection under continuous overload conditions.

Although the rated voltage is usually not reflected directly in the silk screen code, some high voltage models will have the voltage rating appended to the code. For example, "R05-60" means that the rated current of the fuse is 0.5A and the rated voltage is 60V. This is especially important for high voltage circuit design.

Some manufacturers will include production batch or date information in the silk screen code to facilitate traceability of product quality. For example, appending "21A" to the end of the code might indicate production in the first quarter of 2021. This helps with quality management and after-sales service.

When identifying the silk screen code, the manufacturer's specifications and product catalog should be combined. There may be differences in the code rules of different manufacturers, and blind interpretation may lead to incorrect selection. It is recommended that users consult the supplier in detail before purchasing or consult official information.

Accurately identifying the silk screen code can help engineers quickly determine the current capacity and response characteristics of the fuse to ensure circuit safety and stability. Wrong selection may result in protection failure or even damage to components.

The silk screen code of the patch resettable fuse is a key identifier for identifying product parameters, covering rated current, response time, rated voltage and other information. Understanding and mastering these codes will help engineers and purchasers make correct selections and improve the safety protection level of electronic products. In order to ensure accurate selection, it is recommended to make a comprehensive judgment based on the manufacturer's specifications and technical support, so as to maximize the performance of the chip resettable fuse.