### EB2-3TNU-R Electronic Component Overview The **EB2-3TNU-R** is a specific model of a miniature signal relay manufactured by **NEC** (now part of **KEMET**). It belongs to the EB2 series, which are renowned for their compact size, high reliability, and low power consumption. --- ### 1. Key Technical Specifications The part number encodes specific characteristics of the relay. Below are the primary technical parameters: | Parameter | Specification | | :--- | :--- | | **Contact Form** | 2 Form C (DPDT - Double Pole Double Throw) | | **Coil Voltage** | 3 VDC | | **Relay Type** | Latching (Double Coil) | | **Termination Style** | Surface Mount (SMT) - Standard Lead | | **Contact Rating** | 30W, 62.5VA (Max 220VDC / 250VAC) | | **Switching Current** | 1A (Maximum) | | **Packaging** | Taped and Reeled (-R) | --- ### 2. Breakdown of the Part Number Understanding the alphanumeric code helps identify the specific variant: * **EB2**: Series name (Miniature Signal Relay). * **3**: Coil Voltage (3 Volts). * **T**: Latching type (Double coil). Unlike non-latching relays, this requires a pulse to switch and stays in that state without continuous power. * **NU**: Surface mount type (Standard leads). * **-R**: Indicates the part is supplied in **Tape and Reel** packaging for automated pick-and-place assembly. --- ### 3. Electrical Characteristics These relays are designed for precision signal switching rather than high-power loads. * **Latching Mechanism**: Because it is a "Double Coil Latching" relay, it has one coil to "Set" the relay and another to "Reset" it. This makes it ideal for battery-operated devices as it only consumes power during the switching transition. * **Dielectric Strength**: Typically 1,000 VAC between open contacts and 1,500 VAC between coil and contacts. * **Insulation Resistance**: 1,000 MΩ minimum at 500 VDC. --- ### 4. Common Applications Due to its small footprint and latching nature, the EB2-3TNU-R is frequently used in: * **Telecommunications**: Switching lines in PBX or central office equipment. * **Test & Measurement**: Signal routing in oscilloscopes or automated test equipment (ATE). * **Consumer Electronics**: Audio/Video signal switching. * **Medical Equipment**: Low-power diagnostic devices. --- ### 5. Footprint and Mounting The **NU** designation indicates a standard SMT lead configuration. Below is a conceptual representation of the pin layout for a DPDT latching relay: ```text Top View (Pinout Layout) +-------------------+ | 1(S) 2 3 4 | (S) = Set Coil | | | 8(R) 7 6 5 | (R) = Reset Coil +-------------------+ ``` *Note: Always refer to the official KEMET/NEC datasheet for precise mechanical dimensions before PCB design.*