## Technical Overview of EB2-24SNU-R The **EB2-24SNU-R** is a miniature signal relay manufactured by **NEC/Tokin** (now part of KEMET/Yageo). It belongs to the EB2 series, which are surface-mount technology (SMT) versions of the EA2 series. These relays are widely used in telecommunications, instrumentation, and medical equipment due to their high reliability and compact size. --- ### 1. Part Number Breakdown Understanding the suffix codes helps identify the specific characteristics of this component: | Code Segment | Meaning | Specification | |:---|:---|:---| | **EB2** | Series Name | Miniature SMT Signal Relay | | **24** | Nominal Voltage | 24 Volts DC | | **S** | Latching Type | Single Coil Latching | | **NU** | Standard Type | Standard Terminal Shape (UL/CSA recognized) | | **-R** | Packaging | Tape and Reel (for automated assembly) | --- ### 2. Key Technical Specifications #### Electrical Characteristics * **Contact Form:** 2 Form C (DPDT - Double Pole Double Throw). * **Contact Material:** Silver alloy with gold overlay (ensures low contact resistance for small signals). * **Max Switching Power:** 30W / 62.5VA. * **Max Switching Voltage:** 220V DC / 250V AC. * **Max Switching Current:** 1 Ampere. * **Nominal Operating Power:** Approximately 100 mW (highly efficient). #### Coil Data (24V Single Latching) * **Nominal Voltage:** 24V DC. * **Set/Reset Voltage:** 18V DC (75% of nominal). * **Coil Resistance:** 5,760 $\Omega$ (approximate, +/- 10%). --- ### 3. Core Features * **Latching Mechanism:** Being a "Single Coil Latching" relay, it stays in its last position after power is removed. You apply a pulse to "Set" the relay and a reverse-polarity pulse to "Reset" it. This is ideal for battery-powered devices to save energy. * **Compact Footprint:** Designed for high-density mounting on PCBs. * **High Dielectric Strength:** Usually provides 1000V AC between open contacts and 1500V AC between coil and contacts. * **Surge Strength:** Complies with FCC (1500V) and Telcordia (2500V) surge requirements. --- ### 4. Typical Applications | Industry | Usage | |:---|:---| | **Telecommunications** | Switching lines in PABX, modems, and routers. | | **Medical** | Signal routing in diagnostic equipment where isolation is critical. | | **Test & Measurement** | Oscilloscopes, signal generators, and automated test equipment (ATE). | | **Consumer Electronics** | Audio switching and power management in smart home devices. | --- ### 5. Schematic Diagram (Conceptual) ```text DPDT Configuration (Top View Pinout) +--------------+ 1 | [Coil +] | 10 (Coil -) 3 | [NC1] | 8 (NC2) 4 | [COM1] | 7 (COM2) 5 | [NO1] | 6 (NO2) +--------------+ *Note: NC = Normally Closed, NO = Normally Open, COM = Common* ```