The **U74LVC1G126G-AF5-R** is a high-performance, low-voltage CMOS device. It functions as a **single bus buffer gate with a 3-state output**. This specific part is widely used in modern electronics for signal buffering and isolation, especially in battery-powered or low-voltage systems. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Function** | Single Buffer/Bus Driver (Non-Inverting) | | **Output Type** | 3-State (High-Impedance capability) | | **Operating Voltage (Vcc)** | 1.65V to 5.5V | | **Output Current (Ioh/Iol)** | ±24 mA (at 3.3V) | | **Propagation Delay** | ~3.7 ns (at 3.3V) | | **Package Type** | SOT-25 / SOT-23-5 (AF5 suffix) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Functional Description The device features one independent line driver with a 3-state output. The output is controlled by an **Output Enable (OE)** input. * **When OE is HIGH:** The device is active, and the data at input **A** is passed to output **Y**. * **When OE is LOW:** The output enters a high-impedance state (Hi-Z), effectively disconnecting the output pin from the bus. #### Truth Table | Input OE | Input A | Output Y | | :---: | :---: | :---: | | H | H | H | | H | L | L | | L | X | Z (High Impedance) | --- ### 3. Part Number Breakdown Understanding the nomenclature helps in identifying the specific variant: * **U74LVC:** Family (Low-Voltage CMOS). * **1G:** Single Gate (contains only one buffer). * **126:** Function ID (Non-inverting buffer with active-high enable). * **G:** Halogen-free / RoHS compliant. * **AF5:** Package code (typically SOT-23-5). * **R:** Tape and Reel packaging. --- ### 4. Key Features & Applications * **Ioff Circuitry:** Supports partial power-down mode operation. This prevents damaging backflow current through the device when it is powered down. * **Overvoltage Tolerant:** Inputs can handle up to 5.5V even if Vcc is lower (e.g., 3.3V), allowing for voltage level translation. * **Common Uses:** * Signal buffering in smartphones and tablets. * Bus isolation in industrial controllers. * Driving high-capacitive loads or long PCB traces. * Level shifting between 1.8V, 3.3V, and 5V logic.