Surface Mount SMD proud čip Pojistka Čína dodavatel

Several China-based companies specialize in manufacturing surface mount (SMD) current chip fuses, with Dongguan YAXUN Electronics and FBelec being prominent examples. These companies offer a variety of SMD fuse types, including fast-acting and slow-blow options, and cater to different voltage and current ratings, with some specializing in specific applications like car chargers.
Here’s a more detailed look at some key suppliers:
Dongguan YAXUN Electronics Co., Ltd.:
This company is a major manufacturer of circuit protection components, including SMD fuses, and has a strong focus on the household appliance and automotive industries. They offer various sizes (NAPŘ., 0603, 1032, 1206, 2410, 6125) and types (Rychlá rána, slow blow).

2410/1808/6125 SMD elektrická pojistka 0,5A~30A

Eaton Bussmann SMD Electrical Fuse 0603, 6125, 1206 0.25A-50A 32V

0603, 1206 SMD one-time fuse 1~30A 32V, 63PROTI

Čipové pojistky jsou miniaturizované součásti ochrany obvodů, které využívají technologii povrchové montáže (SMT). Dělí se především do dvou kategorií: typ jednorázové pojistky a typ samoobnovení. Následuje podrobný úvod z hlediska klasifikace, pracovní princip, a aplikaci:
1. Core classification
‌One-time chip fuse‌
By size: EIA standard packages such as 0402 (1.0×0.5mm), 0603 (1.6×0.8mm), a 1206 (3.2×1.6mm).
By fuse characteristics:
Slow fuse type (T/TT mark): suitable for circuits with surge currents such as motors and transformers;
Fast fuse type (F/FF mark): used for precision circuits without surges;
Typical structure: ceramic square tube package, filled with quartz sand arc extinguishing medium, and double-layer electrode design to improve conductive stability.

‌Resettable Chip Fuse (PPTC)‌
Core material: polymer resin and conductive particles are composited, and automatic reset is achieved through temperature sensitivity;
Working process: when overcurrent occurs, the resin expands to block the conductive path, and after the fault is eliminated, the conduction is restored after cooling;
Common sizes: 0805, 1812, 2920, atd., maintaining current 0.05-3.0A.

2. Key technical characteristics
Fixační mechanismus: follow Joule’s law (Q=I²Rt), the fuse heats up and melts when overcurrent occurs;
‌Environmental protection process‌: lead-free welding technology, compliant with RoHS 2.0 standards, lead content <1000ppm;
‌Performance optimization‌:
Quartz sand filling shortens the breaking time to 0.1 sekundy (na 20 krát jmenovitý proud);
The self-recovery response speed is inversely proportional to the fault current intensity.

3. Typické scénáře aplikací
‌Consumer electronics‌: mobile phone batteries, USB interface protection (commonly used 0603 obal);
‌Industriální vybavení‌: program-controlled switches, patch panel security units;
‌Automotive electronics‌: vehicle charging circuit overcurrent protection.

SST1300 3A300V 2410 1808 6125 SMD pojistka

Pojistka čipu 1808 Aktuální KOAC 2410 SMD CCF1N Normal Blow 1A 1.6A 2.5A 3.15A 4A 5A 6.3A 8A 10A 125V MOUNT

0603 T1A-8A Ceramic Chip Fuse

4. Zvyšení výběru
The rated current should be more than 1.25 times the working current;
The pulse resistance is weaker than that of glass tube fuses, and the impact of surge current needs to be evaluated;
The self-recovery type is not suitable for scenarios that require complete power-off protection.

Current mainstream manufacturers such as Oxis Electronics have launched improved square chip fuses, which optimize connection reliability through brass square caps and alloy fuses.