XD74LS279 – Quad S-R Latch Logic IC – Xinluda

The Xinluda XD74LS279 is a quad set-reset (S-R) latch logic IC from the 74LS low-power Schottky TTL family, integrating four independent active-low latches in a 16-pin package.

The Xinluda XD74LS279 is a quad set-reset (S-R) latch belonging to the industry-standard 74LS279 family of low-power Schottky TTL logic. It packs four independent S-R latches into a single 16-pin device, providing a simple and reliable building block for de-bouncing switches, level latching, and basic memory/storage functions in digital systems. Two of the four latches feature dual active-low Set inputs, giving designers added flexibility for combining control signals, while the remaining two latches use a single Set input.

As a member of the well-established 74LS (Low-power Schottky) TTL series, the XD74LS279 offers the familiar speed/power balance, robust noise margins, and broad design compatibility that have made the 74LS279 a long-running standard across consumer, industrial, and educational electronics.

Key Features

• Function: Quad (4-channel) Set-Reset (S-R) latch
• Active-low Set and Reset inputs
• Two latches with single Set input, two latches with dual Set inputs
• 74LS / Low-power Schottky TTL logic family
• 16-pin package (DIP-16 / SOP-16 form factors)
• Industry-standard 74LS279 pinout and functionality

Applications

• Contact / switch de-bounce circuits
• Temporary data latching and level storage
• Simple control and sequencing logic
• Legacy TTL board repair and retrofit
• Educational and prototyping digital logic projects

Why Source XD74LS279 from Pacific Component Xchange

The Xinluda XD74LS279 can be difficult to obtain through authorized distribution channels, with limited or no franchised stock available. Pacific Component Xchange specializes in sourcing hard-to-find, end-of-life, and allocated logic and power-management components like the XD74LS279. We support global buyers with authenticity-focused inspection, flexible quantities, and worldwide shipping. Request a quote (RFQ) for the XD74LS279 today and our sourcing team will respond with current availability and lead time.