The part number **2003-47-SM-RPLF** refers to a high-performance **Gas Discharge Tube (GDT)** surge arrestor manufactured by **Bourns Inc.** This component is designed to protect sensitive electronic equipment from voltage transients caused by lightning or electrical switching. --- ### 1. Technical Specifications | Parameter | Value / Description | | :--- | :--- | | **Manufacturer** | Bourns Inc. | | **Component Type** | Gas Discharge Tube (GDT) | | **DC Sparkover Voltage** | 470V (Nominal) | | **Number of Poles** | 3-Pole (Commonly used for Line-Line-Ground protection) | | **Form Factor** | Surface Mount (SMD) | | **Impulse Discharge Current** | 10 kA (8/20 µs) | | **Termination Style** | Gull-wing Lead (SM) | | **Compliance** | RoHS Compliant, Lead-Free (LF) | --- ### 2. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical characteristics: * **2003**: The series identifier (3-electrode high-performance GDT). * **47**: Indicates the DC Sparkover voltage (470 Volts). * **SM**: Surface Mount package style. * **RP**: Reel Pack (packaging format). * **LF**: Lead-Free (RoHS compliant). --- ### 3. Key Features and Benefits * **3-Electrode Design:** Unlike 2-electrode tubes, a 3-electrode GDT provides balanced protection. When one side fires, the entire tube ionizes, ensuring both lines are clamped to ground simultaneously. * **Low Capacitance:** Typically < 2 pF, making it ideal for high-speed data lines (DSL, Ethernet) where signal integrity is critical. * **High Current Handling:** Capable of diverting massive surges (up to 10,000 Amps) without destroying the component. * **Fail-Short Option:** Many versions of this series include a "Fail-Short" mechanism that permanently shorts the device to ground if it reaches a thermal overload state. --- ### 4. Typical Applications This component is widely used in telecommunications and industrial electronics: 1. **Telecommunications:** Protection for POTS, DSL, and broadband equipment. 2. **Industrial:** Surge protection for RS-485, RS-232, and CAN bus interfaces. 3. **Power Supplies:** Protecting AC/DC inputs from atmospheric disturbances. 4. **Data Centers:** Protection for high-density line cards. ---