The **38D2-BY3-R/W** is a specialized electronic component, typically classified as a **Sealed Sub-Miniature Pushbutton Switch**. It is widely used in industrial controls, medical equipment, and networking hardware due to its compact size and environmental protection. --- ### 1. Technical Specifications Below is a breakdown of the core electrical and physical characteristics: | Property | Description | | :--- | :--- | | **Switch Function** | SPDT (Single Pole Double Throw) | | **Circuit State** | On-Mom (Momentary - springs back after press) | | **Current Rating** | 1A @ 250VAC / 3A @ 120VAC or 28VDC | | **Contact Resistance** | 20 mΩ max. initial @ 2-4VDC | | **Insulation Resistance** | 1,000 MΩ min. | | **Dielectric Strength** | 1,000 Vrms min. at sea level | | **Operating Temp** | -30°C to 85°C | --- ### 2. Part Number Breakdown The suffixing in the part number provides specific details about the build: * **38D2**: Series designation (Sub-miniature sealed pushbutton). * **BY**: Actuator/Bushing style (Standard plunger with a threaded or smooth bushing). * **3**: Termination style (likely PC through-hole or right-angle pins). * **R/W**: Contact Material / RoHS Compliance. * **R**: Gold over silver (provides reliable low-level switching). * **W**: Wire wrap or specific RoHS Lead-Free soldering compliance. --- ### 3. Key Features * **Environmental Sealing:** The "Sealed" designation means the switch is designed to withstand soldering processes and cleaning solvents. It often meets **IP67** standards for dust and water resistance. * **Snap-Acting Mechanism:** Provides tactile feedback to the user and ensures rapid contact transfer, reducing arcing. * **Compact Footprint:** Designed for high-density PC board mounting where space is limited. --- ### 4. Typical Applications 1. **Telecommunications:** Reset buttons for routers and modems. 2. **Instrumentation:** Mode selection for handheld testing devices. 3. **Medical:** Control panels for diagnostic equipment requiring wash-down capabilities. ---