TRIAC Driver Optocouplers lower standby power.

Press Release Summary:

Designed to meet regulations such as 1Watt Initiative and ENERGY STAR®, FOD41xx series eliminates RC-snubber network when used to drive snubberless discrete power TRIAC. RoHS-compliant products utilize Pb-free terminals and feature 10,000 V/µs min rating for commutating and static dv/dt, protecting against noise found in industrial environments. Each optically-isolated TRIAC driver also restricts optocoupler from turning on when ac voltage is near zero.

Original Press Release:

Fairchild Semiconductor's Snubberless TRIAC Driver Optocouplers Lower Standby Power

Offer High Static and Commutating dv/dt Immunity

SAN JOSE, Calif. - October 23, 2008 - Fairchild Semiconductor (NYSE: FCS) brings industrial designers an isolation solution that lowers standby power by up to 2W to meet stringent regulations such as the 1Watt Initiative and ENERGY STAR® with its optically-isolated TRIAC drivers. The FOD410, FOD4108, FOD4116 and FOD4118 series of zero-crossing TRIAC driver optocouplers, eliminates the RC-snubber network when used to drive a snubberless discrete power TRIAC, saving board space and energy needed to power this circuitry.

These snubberless TRIAC optocouplers have been designed to withstand high static and commutating dv/dt to protect against the high degree of noise found in noisy industrial environments. Static dv/dt immunity allows the device to remain in the blocking state in the presence of voltage transients, and commutating dv/dt immunity allows the device to turn off when the load voltage and current are out of phase with each other. These FOD41xx optocouplers feature a guaranteed 10,000 V/µs minimum rating for both commutating and static dv/dt. Most of the alternative solutions in the market usually guarantee a minimum static dv/dt immunity with no performance guarantees for commutating dv/dt. The FOD41xx devices are zero-crossing TRIAC driver optocouplers, which restrict the optocoupler from turning on only when the AC voltage is near zero, further improving dv/dt immunity.

Fairchild is a leading supplier of optoelectronic products, offering a wide range of packaging platforms and incorporating various combinations of input and output configurations. These high performance optocouplers deliver a robust isolation interface to ensure low transmission error rates and strong reliability for noisy industrial environments. Fairchild's FOD42xx random phase snubberless TRIAC driver family complements this new offering of TRIAC drive optocouplers and provides equivalent noise immunity and power saving opportunities without the zero-crossing inhibit circuit.

The FOD41xx series of devices utilize lead-free (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. All of Fairchild's products are designed to meet the requirements of the European Union's Directive on the restriction of the use of certain substances (RoHS).

Price (each, 1000 pcs.):
FOD410 US $1.29
FOD4108 US$1.43
FOD4116 US$1.43
FOD4118 US$1.86

Availability: Samples available now

Delivery: 8 weeks ARO

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About Fairchild Semiconductor:
Fairchild Semiconductor (NYSE: FCS) is a global leader delivering energy-efficient power analog and power discrete solutions. Fairchild is The Power Franchise®, providing leading-edge silicon and packaging technologies, manufacturing strength and system expertise for consumer, communications, industrial, portable, computing and automotive systems. An application-driven, solution-based semiconductor supplier, Fairchild provides online design tools and design centers worldwide as part of its comprehensive Global Power ResourceSM. Please contact us on the web at

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