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Phototriacs deliver 1.6mA trigger

Posted: 06 Dec 2005 ?? ?Print Version ?Bookmark and Share

Keywords:Vishay Intertechnology? phototriacs? VO4157? VO4158? VO4257?

Vishay Intertechnology Inc. announced a new line of phototriacs that feature a trigger of 1.6mA and a static dV/dt greater than 5 kV/?s. Encased in a 6-pin DIP package, the new zero-crossing (ZC) and non-zero-crossing (NZC) phototriac optocouplers are designed for switching AC loads and driving larger SCRs or TRIACs in industrial applications.

The ZC VO4157 and VO4158 series phototriacs consist of a GaAs infrared LED that is optically coupled to a photosensitive ZC TRIAC detector chip. Vishay explained that this design type helps reduce EMI noise harmonics while featuring lower peak operating currents, making it well suited for noise sensitive circuits.

On the other hand, devices in the VO4257 and VO4258 series of NZC phototriacs have the advantage of being able to trigger any time during the AC phase cycle and turn off at the next zero crossing. This makes the NZC devices a suitable solution for many phase modulation applications.

Both families have low trigger currents of 1.6mA, making it possible to directly interface with microcontrollers and digital circuits. Trigger currents of 2mA and 3mA are also available.

The new phototriacs feature reinforced insulation per IEC60950 Their target applications include solid-state relays, AC motor drives/triac drives, switching power supplies, programmable controllers, temperature controls, and solenoid/valve controls in industrial products.

Samples of the new VO4157/8 and VO4257/8 phototriacs are already available.

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