This 5pcs/lot set comprises speed optocouplers in DIP4 form factor, including the PS2561, PS25611, PS2561A, and 2561A variants. Designed to transfer fast signals across an electrical isolation barrier, these devices provide reliable galvanic isolation between input and output without sacrificing speed or simplicity. Key benefits speed signal transfer with electrical isolation, enabling fast and reliable performance in digital circuits. Small, easytohandle DIP4 package for straightforward board layout and breadboardfriendly prototyping. Broad compatibility with multiple variants (PS2561, PS25611, PS2561A, 2561A), offering design flexibility across parts with the same footprint. Durable, compact isolation solution suitable for compact control and interface electronics. Five pieces per lot, providing convenient quantity for design, testing, and production. Key attributes Functionality: speed optocoupler with optical isolation between input and output to protect lowvoltage logic from voltage or noisy environments. Package and size: DIP4 plastic package, compact footprint suitable for standard PCB layouts. Compatibility: supports PS2561, PS25611, PS2561A, and 2561A variants, ensuring footprint and electrical characteristics align with these models. Material and construction: plastic DIP4 encapsulation for reliable, lowcost packaging. Performance orientation: optimized for fast response times to support rapid signal isolation in digital circuits. Applications and use cases Isolating microcontroller or digital logic inputs from voltage or noisy power electronics in power supplies, motor controllers, or other control modules. Providing galvanic isolation in digital interfaces and data lines between control microprocessors and external peripherals or communication buses. Isolated signal paths in switching regulators, isolated gate drive interfaces, or other applications requiring fast, reliable optocoupled signaling. Notes The product is presented as a 5piece lot including variants PS2561, PS25611, PS2561A, and 2561A, all in the DIP4 package. This description reflects the brand, model, and features implied by the product name, focusing on speed optocoupler functionality, DIP4 packaging, and the listed variant compatibility.