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Triac drive optocouplers claim best-in-class noise immunity

Posted: 08 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:triac drive optocouplers? best-in-class noise immunity?

Fairchild Semiconductor's FOD420 and FOD4208 random-phase, snubberless triac drive optocouplers provide an easier way to design motor control, power switch and lighting control applications. These products feature a built-in active dv/dt clamp providing best-in-class noise immunity (dv/dt) of 10,000V/?s, which is higher than the average dv/dt rating of 1,500V/?s for monolithic triacs.

The high-noise immunity makes these products well-suited for isolating solid-state relays, AC motor controls and lighting ballasts in noisy industrial environments. In addition, the higher performance eliminates the RC snubber network required for lower dv/dt rated monolithic opto triac drivers and saves design time and BOM costs, Fairchild said.

The triac drive optocouplers provide 5,000V of isolation while controlling the power triacs that switch the load, which allow them to be used in conjunction with Fairchild's discrete power triacs such as the FKN08PN60S and the FKPF8N80.

The FOD420 and FOD4208 products feature Pb-free terminals and have been characterized for moisture sensitivity in accordance with the Pb-free reflow requirements of the joint IPC/JEDEC standard J-STD-020. The devices are RoHS compliant.

Pricing is $1.71 each for the FOD420 and $1.89 each for the FOD4208, both in quantities of 1,000.

Samples are available now. Delivery is six weeks ARO.

- Gina Roos

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