## Overview of EB2-12TNU-R The **EB2-12TNU-R** is a specific model within the **EB2 series** of miniature signal relays manufactured by **NEC** (now part of **KEMET/TOKIN**). These relays are widely recognized for their compact size, high reliability, and low power consumption, making them ideal for telecommunications and signal switching applications. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Relay Type** | Latching (Double Coil) | | **Contact Form** | 2 Form C (DPDT - Double Pole Double Throw) | | **Nominal Coil Voltage** | 12 VDC | | **Contact Material** | Silver alloy with gold overlay | | **Switching Power** | 30W, 62.5VA | | **Max Switching Voltage** | 220V DC / 250V AC | | **Max Switching Current** | 2A | | **Mounting Type** | Surface Mount (SMD) - T-Type (Minimum footprint) | --- ### 2. Breakdown of the Model Name Understanding the suffix codes helps identify the specific electronic characteristics of this part: * **EB2**: Series name (Miniature Signal Relay). * **12**: Represents the **Nominal Coil Voltage** (12 Volts DC). * **T**: Indicates the **Terminal Shape**. "T" stands for the standard SMT (Surface Mount Technology) lead shape. * **NU**: Indicates the **Standard Type** (non-latching vs latching). However, in this specific series, "NU" often refers to the UL/CSA safety standard recognition. * **-R**: Indicates the **Packaging**. The "R" usually stands for **Tape and Reel**, signifying it is packaged for automated pick-and-place assembly. --- ### 3. Electronic Characteristics & Features #### Latching Mechanism Unlike standard non-latching relays that require continuous power to stay in an "ON" state, the EB2-12TNU-R is a **latching relay**. It uses a permanent magnet to hold the contacts in position. * **Efficiency:** It only requires a brief pulse of electricity to switch states, significantly reducing power consumption in long-term operations. * **Stability:** The relay remains in its last state even if power is completely lost. #### Signal Integrity * **Gold Overlay:** The contacts are gold-plated, which prevents oxidation and ensures a reliable connection for low-level signals (dry circuits). * **Dielectric Strength:** Designed to withstand high surge voltages (typically up to 2500V between open contacts), meeting FCC Part 68 requirements. --- ### 4. Common Applications * **Telecommunications:** Switching test equipment, PABX, and modems. * **Measurement Instruments:** Oscilloscopes and signal generators. * **Medical Equipment:** Low-power diagnostic devices. * **Consumer Electronics:** High-fidelity audio switching. ---