Precautions for Selecting Chip Fuses

PublishTime： 2023-11-26 Article Source：XC News

With the development of highly integrated electronic products such as digital cameras, laptops, and smartphones, an urgent need for factories to adopt full automation to reduce high labor costs in the market environment. Chip Fuses are widely used in overcurrent protection applications, but due to differences in technology, they have different advantages compared to plug-in Self-recovery fuses. At the same time, chip fuses also have some of their own weaknesses.

So there are some things to pay attention to when selecting SMD fuses:

1 Maintain current. When selecting a type, it is necessary to determine the normal current of the circuit to select the corresponding model of the SMD fuse. Maintaining current needs to be equal to or similar to the normal working current of the circuit Action current. When selecting the protected current, the operating current of the patch fuse should be less than or equal to the current that needs to be protected in the protected circuit.

2. Withstand voltage value: When selecting a type, it is necessary to have a withstand voltage value higher than the highest voltage of the protected circuit, otherwise the protection component may be burned or misprotected Working environment temperature. Self-recovery fuses in circuits are subject to a temperature reduction caused by the temperature of the working environment, and of course, patch fuses are no eXCeption. Therefore, it is necessary to downgrade the use of SMD fuses based on the corresponding reduction in operating environment temperature during selection.

3. Ability to withstand pulse and surge currents. Transient values may occur in circuits such as pulse, surge current, surge current, and starting current. This requires the existence time and size of this transient value. Due to the small size of patch fuses and industrial limitations, it is necessary to consider whether they can withstand surges, pulses, and other situations that may occur in the circuit.

4. Action time: Some protected circuits require protection at a certain current for a certain period of time, so it is necessary to consider whether the protection time of the fuse meets the requirements.

5. Product size: Due to the fact that SMD fuses are usually used on highly integrated products, it is usually necessary to pay attention to whether the corresponding packaging can be properly installed on the protected circuit during selection Product certification. If product certification needs to be exported, it is necessary to consider whether the product has corresponding certification requirements. For example, when exporting to Germany, TUV certification is required for the selection of patch fuses.

As a type of overcurrent protector, the selection precautions will vary depending on the actual application of the product. The application range of fuses is very wide, and the selection requirements for SMD fuses may vary depending on the product and customer requirements. However, the above 5 points need to be noted at any time in terms of selection. In short, whether it is the selection of PPTC for SMD fuses or the selection of primary SMD fuses, it requires a combination of theory and practical situations to select the most suitable product.

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