XL74LS279 – Quad S-R Latch – Xinluda

About this part

The XL74LS279 from Xinluda is a quad set-reset (S-R) latch belonging to the 74LS low-power Schottky TTL logic family. It integrates four independent S-R latches into a single 16-pin, 300-mil SOP-16 package, making it a compact building block for level-triggered storage, debounce circuits, and simple state-holding applications. A low pulse on an S input sets the corresponding Q output high; a low pulse on the R input resets that output low.

As a function-compatible equivalent to the industry-standard 74LS279, the XL74LS279 is widely used where a small, reliable latch array is needed alongside microcontrollers and other TTL/CMOS logic. Pacific Component Xchange stocks and sources this Xinluda part for engineers and buyers who need it on short notice.

Key Features

• Four independent set-reset (S-R) latches in one package
• 74LS low-power Schottky TTL logic family
• Operating supply voltage: 4.75 V to 5.25 V
• Operating temperature range: 0 °C to +70 °C
• Output low current (I_OL): 8 mA
• Output high current (I_OH): -0.4 mA
• Typical low-to-high propagation delay (t_PLH): 22 ns
• 16-pin SOP-16 (300-mil) surface-mount package

Applications

• Level-triggered data latching and storage
• Switch debounce and signal conditioning
• Simple state-holding and flag registers
• Microcontroller and TTL/CMOS logic interfacing
• Legacy and industrial control board repair/replacement

Why Source XL74LS279 from Pacific Component Xchange

The XL74LS279 is a niche, hard-to-find logic IC with limited authorized-distributor availability. Pacific Component Xchange specializes in sourcing exactly these kinds of scarce and obsolete logic and power-management components. We offer authenticity verification, global shipping, and responsive quoting so you can keep production and repair lines moving. Request a quote (RFQ) today and our team will confirm availability, lead time, and pricing for your required quantity.