The **2003-40-SM-RPLF** is a specialized electronic component manufactured by **Bourns**. It is a Gas Discharge Tube (GDT) surge arrestor designed for high-speed telecommunications and data line protection. --- ## 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical and physical characteristics. | Parameter | Specification | | :--- | :--- | | **Component Type** | Gas Discharge Tube (GDT) | | **DC Sparkover Voltage** | 400V (±20% Tolerance) | | **Number of Electrodes** | 3 (Commonly used for Tip/Ring/Ground lines) | | **Package / Case** | Surface Mount (SMD) | | **Impulse Discharge Current** | 10 kA (8/20 µs waveform) | | **Insulation Resistance** | > 10^9 Ohms | | **Capacitance** | < 2.0 pF (Low capacitance for high speed) | | **RoHS Status** | Compliant (LF = Lead Free) | --- ## 2. Key Features and Benefits * **Low Capacitance:** Because it adds very little capacitance to the circuit, it is ideal for high-frequency signal lines (like ADSL2+, VDSL, and Ethernet) without causing signal degradation. * **Fail-Short Mechanism:** The "R" in the suffix often denotes a specialized ruggedized or specific fail-short mechanism variant, ensuring that if the device fails under extreme overvoltage, it creates a short circuit to ground to protect downstream equipment. * **Surface Mount Design:** Optimized for automated pick-and-place assembly, reducing manufacturing costs compared to through-hole versions. --- ## 3. Applications The 2003 series is typically found in environments where lightning strikes or power surges are a risk to sensitive electronics: 1. **Telecommunications:** Protection for central office equipment and subscriber line interface cards (SLICs). 2. **Data Networking:** Protection for modems, routers, and gateways. 3. **Industrial Controls:** Protecting RS-485 or CAN bus lines from transient voltages. --- ## 4. Part Number Breakdown The naming convention is structured as follows: | Segment | Meaning | | :--- | :--- | | **2003** | Series identifier (3-electrode GDT) | | **40** | Voltage rating (40 x 10 = 400V) | | **SM** | Surface Mount packaging | | **R** | Specific designator (often referring to specific terminal plating or internal configuration) | | **P** | Protection feature variant | | **LF** | Lead-Free (RoHS Compliant) |