Semec Specials
Semec Specials Including news about RoHS, Varistor, Basic info of capacitors, Trimming Potentiometers, Semec hot products etc. Please refer to below details :
Capacitor ESR
ESR is the equivalent series resistance of a capacitor. An ideal capacitor would have only capacitance. More infomation...
Capacitor Leakage
Even though a capacitor's plates are insulated from each other, there is a small amount of 'leakage' current between its plates. More infomation...
Film Capacitors
Many low value capacitors (less than 1 microfarad) will have a plastic type of insulator (polyethylene, polypropylene...) between the plates. More infomation...
Capacitor and DC voltage
When a DC voltage source is applied to a capacitor there is an initial surge of current, when the voltage across the terminals of the capacitor is equal to the applied voltage, the current flow stops. More infomation...
Capacitors and AC voltage
Generally, if an AC voltage source is connected to a capacitor, the current will flow through the capacitor until the source is removed. More infomation...
RoHS
RoHS is the acronym for Restriction of Hazardous Substances. RoHS, also known as Directive 2002/95/EC, originated in the European Union and restricts the use of specific hazardous materials found in electrical and electronic products. All applicable products in the EU market after July 1, 2006 must pass RoHS compliance. More infomation...
About Varistor
Varistors are nonlinear two-electrode semiconductor voltage-dependant resistors. The current in a varistor is proportional to applied voltage raised to a power. These devices are normally made of zinc oxide. Upon application of a high voltage pulse (such as lighting) they conduct a large current, thereby absorbing the pulse energy in the bulk of the material with only a relatively small increase in voltage, thereby protecting the circuit. More infomation...
Basic info of capacitors
Capacitor is kind of electronic components that can very quickly store and release electric charges. A capacitor basically consists of two mutually insulated conductive plates. Capacitors are needed in virtually all electronic circuits. More infomation...
Trimming Potentiometers
Potentiometers, rheostats and trimmers are three-terminal resistors that are used to measure or divide voltages, and to protect or control circuits. Potentiometers are variable resistors that are adjusted with a knob or dial. Potentiometers, rheostats and trimmers carry specifications for potentiometer category and actuator configuration. In terms of actuator configuration, choices include single-turn, multi-turn, and slide. With single-turn devices, the shaft rotation is limited to less than or equal to 360 degrees. By contrast, multi-turn potentiometers, rheostats and trimmers can be rotated multiple times, with as many as 15 or 20 turns from stop to stop. Slide-actuated products require the user to move a handle instead of rotating a knob. More infomation...
Hot products
Semec ongoing development efforts lead below existing hot selling products: More infomation...
Semec Varistor application
Our Varistor voltage is from 18V to 1800V, wide voltage make it with wide area of application: More infomation...
Semec X2 EMI Suppression Film Capacitor
Semec SCX series X2 Suppression film capacitor features value from 0.0022uF to 4.7uF and with pitch from 10mm to 27.5mm. It is ideal for Ideal for filters, power supplies, and mains applications. More infomation...
SCS series and SCT Tantalum Capacitors
Semec SCS Chip Tantalum Capacitor and SCT Dipped Tantalum Capacitor are available with different case sizes and different values. More infomation...