The **SV-5WA-R/Q** refers to a high-quality, subminiature signal relay, commonly manufactured by **NEC/Tokin** (now part of KEMET/Yageo). These components are widely used in telecommunications, medical equipment, and security systems due to their high sensitivity and compact size. --- ### 1. Key Technical Specifications The "5W" in the part number typically denotes the nominal coil voltage, while the "A" refers to the specific package or contact style. | Feature | Specification | | :--- | :--- | | **Relay Type** | Subminiature Signal Relay | | **Contact Form** | 2 Form C (DPDT - Double Pole Double Throw) | | **Coil Voltage** | 5V DC | | **Power Consumption** | Approx. 140mW (High sensitivity) | | **Contact Material** | Silver alloy with Gold overlay | | **Switching Capacity** | 1A @ 30VDC / 0.5A @ 125VAC | | **Mounting Type** | Through-hole (DIP) | --- ### 2. Physical and Electrical Structure The device consists of several critical electronic and mechanical parts integrated into a sealed housing: * **Electromagnetic Coil:** A precision-wound copper coil designed to operate at 5V. It generates the magnetic field required to move the armature. * **Bifurcated Contacts:** The "Q" or "R" variants often feature bifurcated (split) contacts coated in gold. This design ensures high reliability when switching low-level signals (dry circuits) by providing two contact points for every connection. * **Washable Case:** These relays are usually "plastic sealed," meaning they are resistant to automated soldering fluxes and cleaning solvents. * **Lead Pins:** Arranged in a standard Dual In-line Package (DIP) grid, making them compatible with standard PCBs and IC sockets. --- ### 3. Application Use Cases Due to its low power consumption and high reliability, this part is used in: 1. **Telecommunications:** Switching line signals in PABX or modems. 2. **Audio Equipment:** Signal routing in high-fidelity pre-amps where low contact resistance is vital. 3. **Test & Measurement:** Used in automated test equipment (ATE) to route signals between the device under test and the sensors. --- ### 4. Circuit Symbol and Connection ```text (Top View) +--------------+ | 1 2 3 4 5| <-- Pin Row A | | | 10 9 8 7 6| <-- Pin Row B +--------------+ (Pinout varies by specific datasheet version) ```