The SN74LS125ANSR is a quad buffer/line driver with 3state outputs in a compact SO14 package from Texas Instruments. This device provides four independent buffers with individual output enable controls, allowing you to buffer and selectively drive signals in mixedsignal and digital circuits. Packaged in an SO14 surfacemount form, it is suitable for spaceconstrained designs and fast prototyping. Key benefits Increases drive capability and reduces load on the driving source by buffering multiple signals. Independent output enables support impedance bus sharing, enabling safe interconnection between multiple devices without contention. Part of the LS (Lowpower Schottky) TTL family, offering reliable, fast switching with low power consumption for typical 5V digital logic systems. Compact SO14 package supports dense PCB layouts and easy surfacemount assembly. Eight pieces per provide multiple devices for boards with several buffered channels or for inventory needs. Key attributes Functionality: Quad buffer/line driver with 3state outputs (A1, A2, A3, A4 inputs; Y1, Y2, Y3, Y4 outputs; OE1, OE2, OE3, OE4 enables) Compatibility: Designed for 5V digital logic, typical TTL LS family performance; suitable for interfacing microcontrollers, memories, and peripheral devices Package: SO14 surfacemount package Quantity: 8 pieces per package Brand/Model: Texas Instruments SN74LS125AN; SN74LS125ANSR packaging variant in SO14 form What makes it unique Four independent buffers with dedicated 3state outputs and separate enable pins provide flexible signal routing and bus management in a single compact IC. The LS family combines relatively fast switching with low static power, making it a practical choice for common 5V logic applications. Typical applications Microcontroller and peripheral interfacing: Buffer data lines from a microcontroller to external devices while enabling controlled tristating to avoid bus contention. Bus architecture and signal isolation: Buffer and isolate data/address lines on shared buses in embedded systems or development boards. System prototyping and testing: Use as a versatile buffer in test fixtures or logic demos to route signals with controlled enable states. How to use Connect the data lines to A1–A4 and route the buffered outputs to Y1–Y4. Control each channel's output with OE1–OE4 to enable or tristate individual outputs as needed. Supply the device with the appropriate 5V logic supply (typical 4.75V–5.25V range) and place appropriate decoupling near Vcc for stable operation. Notes Ensure proper layout and decoupling for reliable speed operation. Verify enable control logic to achieve the desired tristate behavior in your design. Overall, the SN74LS125ANSR delivers a reliable, spaceefficient solution for buffering multiple digital signals with precise, independently controlled tristate outputs, ideal for expanding fanout, protecting devices, and enabling safe bussharing in 5V logic systems.