## Overview of EE2-5TNUN-R The **EE2-5TNUN-R** is a specific model of a miniature signal relay manufactured by **KEMET** (formerly NEC/Tokin). It belongs to the **EE2 series**, which is widely recognized for its compact size, high reliability, and low power consumption in communication and electronic switching applications. --- ### 1. Key Technical Specifications The model name contains specific information about its electrical characteristics: | Feature | Specification | | :--- | :--- | | **Contact Form** | 2 Form C (DPDT - Double Pole Double Throw) | | **Nominal Coil Voltage** | 5 VDC | | **Relay Type** | Latching (Double Coil) | | **Contact Rating** | 30W, 62.5VA (Maximum 220VDC / 250VAC) | | **Maximum Switching Current** | 2A | | **Coil Resistance** | Approximately 178 $\Omega$ | | **Mounting Type** | Surface Mount (SMD) - Standard lead type | --- ### 2. Breakdown of the Model Code (EE2-5TNUN-R) Understanding the nomenclature helps in identifying the specific variant: * **EE2**: Series Name (Miniature Signal Relay). * **5**: Nominal Coil Voltage (5 Volts). * **T**: Latching type with **Double Coil**. * **NU**: Standard through-hole pins modified for Surface Mount (SMD). * **N**: High breakdown voltage (usually between contacts and coil). * **-R**: Tape and Reel packaging for automated assembly. --- ### 3. Physical & Material Properties These relays are designed for high-density mounting on Printed Circuit Boards (PCBs). * **Dimensions:** Approximately 15mm x 7.5mm x 10mm. * **Contact Material:** Silver alloy with gold overlay (ensures low contact resistance for small signals). * **Environmental Compliance:** RoHS and REACH compliant; Lead-free. --- ### 4. Applications Because it is a **latching relay**, it is highly energy-efficient because it only requires a brief pulse of power to change states and stays in that state without continuous power. * **Telecommunications:** Switching test equipment and telephone lines. * **Instrumentation:** Data acquisition systems and oscilloscopes. * **Medical Equipment:** Low-power signal switching in diagnostic tools. * **Consumer Electronics:** Power management and signal routing. --- ### 5. Circuit Symbol Example (DPDT) ```mermaid graph LR subgraph Relay_Internal A[Coil 1] --- B[Set] C[Coil 2] --- D[Reset] E[COM 1] --- F[NC 1] E --- G[NO 1] H[COM 2] --- I[NC 2] H --- J[NO 2] end ```