& < c==/.Litfuse resettable fuse/.Litfuse resettable fuse
< c=_ = Songti US first-class agent, mainly involved in production for the automotive, industrial, portable equipment, computer and communications markets device. We can provide professional technology and product solutions according to customer needs.
Series devices provide surface mount overcurrent protection for equipment where space is extremely limited and where resettable protection is required.
Functions and Features:
R-compliant, lead-free
Fast response to fault current
Compact design saves board space
Low resistance
Small size
.>Compatible with high-temperature solder
.
IoT sensors are new and new products for modern communications, mainly used in homes, businesses, logistics companies, Courier companies, postal and telecommunications system management and other places. The IoT sensor is connected behind the converter, computer, and internet. It is a front-end communication product for modern networks.
The communication distance ranges from far to short. The communication method is mostly R mode. This communication method has lower voltage, smaller current and longer lines. Such lines are easily burned out by lightning strikes.
In practical applications, the R interface circuit is easily damaged because the IoT sensor system itself is a complex system. IoT sensor products are generally produced by professional manufacturers, and their various accessories are There are different manufacturers designing and producing, and their electrical connection and matching are the main issues for design engineers.
Due to the complexity of the system, the electromagnetic environment generated is also very complex. If you are not careful, wiring power lines will occur. Problems such as wrong connection of data cable, reverse connection of power cable, short circuit of data cable, etc. These problems eventually manifest themselves as burning out the R data interface circuit, or damaging the entire elevator controller system.
At the same time, due to the complex electromagnetic environment, the circuit often senses high voltage, high voltage, etc. in the space, damaging the R circuit or system of the controller. There are also long connection cables that are easily damaged by lightning intrusion or induced instantaneous high voltage on the R interface circuit and controller system, etc. To deal with the above problems, a reliable protection circuit must be designed for the R interface, including overcurrent protection and overvoltage protection.
The use of (positive temperature coefficient) devices is a cost-effective protection solution. Under short-circuit fault conditions, the device can quickly change from a low-resistance state to a high-resistance state, thereby limiting the current to protect the R interface and equipment.
For overvoltage protection, we can use tubes (silicon-based protection devices). The tube clamping voltage is low, the resistance energy is high, and the package size is small. It is an ideal choice for R interface electrostatic protection and overvoltage protection. . The figure below is a typical application using devices and device protection on the R port
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1206L075/13.2 13.2V resettable fuse