The **EB2-12SNUL-R** is a specific model of a miniature signal relay manufactured by **KEMET** (formerly NEC/Tokin). It belongs to the EB2 series, which is widely used in telecommunications and low-signal switching applications. --- ### ## Technical Specifications Overview The part number "EB2-12SNUL-R" can be broken down into its specific technical characteristics: | Feature | Specification | | :--- | :--- | | **Series** | EB2 (Miniature Signal Relay) | | **Coil Voltage** | 12V DC | | **Relay Type** | Single-Winding Latching | | **Contact Form** | 2 Form C (DPDT - Double Pole Double Throw) | | **Mounting Type** | Surface Mount (SMD) | | **Terminal Shape** | Gull-wing | | **Special Standard** | UL/CSA Recognized | --- ### ### Key Electronic Components & Internal Mechanics 1. **Latching Mechanism (S - Single Winding):** Unlike standard "non-latching" relays that require constant power to stay active, this is a **latching relay**. It uses a permanent magnet to hold the contacts in position. A short pulse of 12V DC switches the state, and it remains in that state without further power consumption. 2. **Contact Materials:** The contacts are typically made of **Silver alloy with gold overlay**. The gold plating ensures high reliability when switching very low currents (dry circuits) by preventing oxidation on the contact surfaces. 3. **Dielectric Strength:** Despite its small size, it provides significant isolation: * **Between open contacts:** 1,000V AC * **Between coil and contacts:** 1,500V AC 4. **Power Consumption:** Because it is a latching relay, the "nominal operating power" is only consumed during the transition (approx. 100mW - 140mW). This makes it ideal for battery-powered devices. --- ### ### Application Use Cases Due to its high reliability and compact SMD footprint, the EB2-12SNUL-R is commonly found in: * **Telecommunication Equipment:** Switching telephone lines or signal routing. * **Measurement Instruments:** Oscilloscopes and automated test equipment (ATE). * **Medical Electronics:** Signal isolation in diagnostic tools. * **Audio/Video:** Low-distortion signal switching. --- ### ### Typical Wiring Diagram (Simplified) ```text [COIL] (1) o--[ ]--o (12) <- Apply 12V pulse to Set/Reset [CONTACTS] (3) o---. .---o (10) [NC] (4) o---|---|---o (9) [COM] (5) o---' '---o (8) [NO] ```