## Technical Overview: EB2-12TNUH-R Signal Relay The **EB2-12TNUH-R** is a miniature, surface-mount (SMD) signal relay manufactured by **KEMET** (formerly NEC/Tokin). It belongs to the EB2 series, known for its high reliability and ultra-low profile design, primarily used in telecommunications and test equipment. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Contact Form** | 2 Form C (DPDT - Double Pole Double Throw) | | **Rated Coil Voltage** | 12 VDC | | **Coil Resistance** | 1,028 $\Omega$ (Typical) | | **Contact Rating** | 30W, 62.5VA (Max 220VDC / 250VAC) | | **Maximum Switching Current** | 1 A | | **Termination Style** | Gull-wing (Surface Mount) | | **Latch Type** | Non-latching (Monostable) | | **Special Feature** | High breakdown voltage / Ultra-low profile | --- ### 2. Breakdown of the Part Number The alphanumeric code provides specific details about the component's construction: * **EB2**: Series Name (Miniature Signal Relay). * **12**: Rated Coil Voltage (12 Volts). * **T**: High Breakdown Voltage type (T-series). * **N**: Standard Contact Type. * **UH**: High Heat Resistance / Surface Mount (Gull-wing). * **R**: Taping/Packaging (Reel). --- ### 3. Electronic Characteristics #### A. Contact System The device features **2 Form C** contacts, meaning it has two independent sets of changeover switches. The contacts are typically gold-overlaid silver alloy to ensure low contact resistance and high reliability for low-level signals. #### B. Coil Performance * **Nominal Operating Power:** Approximately 140 mW. * **Must Operate Voltage:** 75% of nominal voltage (9 VDC). * **Must Release Voltage:** 10% of nominal voltage (1.2 VDC). #### C. Dielectric Strength Being a **T-series** variant, this relay is designed for higher isolation: * **Between open contacts:** 1,000 VAC (for 1 minute). * **Between coil and contacts:** 1,500 VAC (for 1 minute). * **Surge Strength:** 2,500 V (between coil and contacts). --- ### 4. Common Applications Due to its small footprint and high dielectric strength, this part is commonly found in: 1. **Telecommunications:** Switching for PABX and central office equipment. 2. **Test & Measurement:** Oscilloscopes and automated test equipment (ATE). 3. **Medical Equipment:** Isolated signal switching. 4. **Consumer Electronics:** Power management in high-end audio or smart home devices.