Semiconductor Devices

VRD (Voltage Regulating Diode)

SEMITEC Voltage Regulating Diode (VRD) is a transient voltage suppressor device that is designed to absorb voltage surges and spikes that occur during power initiation. Our VRD features uniform avalanche breakdown across the junction, enabling very fast response to surge voltage.
Furthermore, its control voltage is almost independent from the current which makes it a highly reliable, high performance device.

SEMITEC'S VRDs are fully compliant with RoHS DIRECTIVE2011/65/EU.


Zenamic is Semitec's registered trademark for metal oxide varistors which are transient voltage surge absorbers. Zenamic features large surge current and transient overvoltage handling capabilities. It is produced by sintering a ZnO based metal oxide mix at temperatures ranging from 1200 to 1400℃.

SEMITEC'S Zenamic products are fully compliant with RoHS DIRECTIVE2011/65/EU.

CRD (Current Regulating Diode )

Current regulating diodes (CRD hereunder) are diodes that maintain a constant current flow despite voltage fluctuations. CRDs supply constant current over a wide range of voltage from sub 1V to 100V. Constant current is supplied, regardless of fluctuations in voltage applied, load resistance changes and ripple voltage. Creating a constant current circuit generally involves multiple components, but with SEMITEC CRDs only one part is required to accomplish the same function.

SEMITEC'S CRDs are fully compliant with RoHS DIRECTIVE2011/65/EU.

Power Thermistors

Power Thermistors, also known as Inrush Current Suppressors, are a sub-category of NTC (Negative Temperature Coefficient) thermistors. Power Thermistors utilize the self heating properties of NTC thermistors which self heat with current flow, dramatically decreasing resistance.

SEMITEC'S power thermistors are fully compliant with RoHS DIRECTIVE2011/65/EU.