The **2017-50-SMH-RPLF** is a specific part number for a **Surface Mount Gas Discharge Tube (GDT)**, typically manufactured by **Bourns**. These components are critical for circuit protection against high-voltage transients (surges). --- ## 1. Technical Specifications The part number is coded to represent specific electrical and physical characteristics. | Feature | Specification | | :--- | :--- | | **Component Type** | Gas Discharge Tube (GDT) | | **DC Sparkover Voltage** | 500V (±20%) | | **Number of Electrodes** | 2-electrode design | | **Package / Case** | 2017 (5.0 x 4.4 x 4.4 mm approx.) | | **Mounting Type** | Surface Mount (SMD) | | **Impulse Discharge Current** | 10 kA (8/20 μs waveform) | | **Insulation Resistance** | > 1 GΩ | | **Capacitance** | < 1 pF | | **RoHS Status** | Compliant (LF suffix denotes Lead-Free) | --- ## 2. Key Features and Benefits * **Low Capacitance:** Because the capacitance is extremely low (< 1 pF), this part is ideal for high-speed data lines as it does not distort the signal. * **High Surge Current Handling:** Capable of diverting large energy spikes (up to 10,000 Amps) safely to the ground. * **Stable Performance:** Designed to maintain a consistent breakdown voltage over a wide temperature range and throughout its service life. * **Compact Form Factor:** The "2017" size is optimized for automated pick-and-place assembly on PCBs. --- ## 3. Common Applications This component is generally used as a "first line of defense" in power and communication circuits: 1. **Telecommunications:** Protection for ADSL, VDSL, and Ethernet ports. 2. **Industrial Equipment:** Protecting sensitive PLC inputs from lightning or switching surges. 3. **Power Supplies:** Used in AC/DC converters to prevent overvoltage from reaching internal components. 4. **Modems and Routers:** Shielding the internal circuitry from spikes entering through the external line. --- ## 4. Part Number Breakdown (Nomenclature) * **2017**: The series designation (Surface Mount, 2-electrode, 5mm diameter). * **50**: Represents the DC Sparkover voltage (50 x 10 = 500V). * **SMH**: Refers to the specific terminal/housing style (Surface Mount Heavy duty). * **RP**: Indicates "Reel Pack" (packaging for automated assembly). * **LF**: Lead-Free (RoHS Compliant).