Designation and selection method of Varistor type for Socay chip

In many circuit protection devices, the application of SMD Varistor is not as wide as the discharge tube and diode, but its electrostatic protection in handheld and portable electronic products cannot be neglected. Because of the wide use of handheld electronic products, chip-type leadless varistor market growth rate will continue to increase, will gradually exceed the output of leaded Varistor, become the mainstream products in the future. It is precisely because of the small size of SMD varistor, more and more widely used in some handheld devices and miniaturization of electronic equipment. Used to protect components and circuitry against ESDgenerated by power supply, control, and signal lines. This article Xiao Shuo's focus is not to talk about the market development of SMD Varistors, but from the application of SMD Varistor to tell the name and selection method of SMD Varistor model.

As a hardware engineer, want to use the components of the handy, you need to through its material, electrical characteristics and its particularity to do in-depth understanding. Resistance knowledge covers a lot, not only know Ohm's law can be applied well, including the material and its special properties, such as the resistance value of the resistor element is generally related to temperature, material, length, and cross-sectional area, the measurement of the resistance is affected by the temperature of the physical quantity is the temperature coefficient, which is defined as the temperature per 1 increase Percentage of change in resistance value when ℃ ; the main physical characteristics of the resistance is to change the electrical energy for thermal energy, it can also be said that it is a power dissipation element, the current through it produces loss, in the form of heat energy performance ; The function of the resistance in the circuit is usually divided into voltage and shunt. ; for signals, both AC and DC signals can be passed through resistors.

Name of SMD Varistor type:

Model	Sc	0603	ML	080	M
Named	Brand	Packaging	Series Type	Pressure-sensitive resistors	Error
Model	Sc	0603	E	050	M05
Named	Brand	Packaging	Series Type	Capacitance value	Operating voltage

The table above is the name of Socay electronic SMD Varistor model , which roughly includes brand, package, Specification series, varistor, capacitance value, working voltage and error value. SC is the master Kai self-brand, at present Shuo Kay Electronic SMD Varistor mainly has the following package:0402 package,0603 package, 0805 Package,1206 package,1210 package, and 2220 Package The specification series are as follows:sc0402e series,sc0603e series,sc0402ml series, sc0603ml series,sc0805ml series,sc1206ml series, sc1210ml series ,sc1812ml series,sc2220ml series; product Voltage value 3.3V-253.

SMD Varistor Selection Method:

SMD Varistor itself is another form of varistors, so its selection principle must also be consistent with the plug-in varistor:DC(operating voltage)>1.5*ac (operating voltage in the circuit), in addition to the use of chip resistors, the maximum power can not exceed its rated power, otherwise it will reduce its reliability. Generally according to the maximum operating voltage of the 75% derating design and use; When the ambient temperature exceeds °C, the derating curve must be used. Also cannot exceed its maximum operating voltage, otherwise there is a risk of breakdown.

Designation and selection method of Varistor type for Socay chip