FOD4116TV replacement guide for obsolete triac drivers

The FOD4116TV is a 6-pin DIP zero-cross triac driver optoisolator, specifically certified for safety (VDE) and featuring a 0.4" lead spacing (T). Mouser Datasheetz While highly effective for AC power control, the product is currently discontinued/obsolete by its original manufacturers (Fairchild/onsemi), shifting the market focus toward specialized stockists and modern replacements. Mouser Digikey

Product Insights

Key Specifications: It features a 600V peak off-state voltage, a high sensitivity LED trigger current of 1.3mA, and an industry-leading static dv/dt of 10,000 V/µs, making it robust against electrical noise. Mouser Onsemi
Core Applications: Primarily used in solid-state relays, industrial process controls, and high-efficiency lighting systems. Mouser Arrow
Market Status: Listed as "Obsolete" or "End of Life." It is now predominantly available as "New Old Stock" (NOS) through authorized aftermarket distributors like Rochester Electronics. Mouser Digikey

Market Trends & Sourcing

Availability: Although discontinued, active listings still exist on B2B platforms, primarily from specialized electronic component suppliers in Shenzhen. Alibaba Alibaba
Pricing: Prices for original "New and Original" stock typically range from $1.08 to $1.28 per piece, though lower-priced variants (SMD versions like FOD4116SV) can be found for as low as $0.05–$0.20 in bulk. Alibaba Alibaba
Modern Replacements: For new designs, the MOC306x or MOC316x series are the recommended active equivalents, offering similar zero-crossing triac driving capabilities with modern supply chain support. Mouser Alibaba