The **3402-R** typically refers to a high-precision, surface-mount (SMD) **resistor network** or a specific **potentiometer/trimmer** series depending on the manufacturer (most commonly associated with brands like Bourns or specialized aerospace electronics). Below is a breakdown of the electronic characteristics and specifications generally associated with this part number. --- ## 1. Technical Specifications This component is designed for applications requiring high stability and precision. | Feature | Typical Specification | | :--- | :--- | | **Component Type** | Resistor Network / Precision Trimmer | | **Resistance Range** | 10 $\Omega$ to 1 M$\Omega$ (Standard) | | **Tolerance** | ±1% to ±5% | | **Power Rating** | 0.25W to 0.5W at 70°C | | **Voltage Rating** | 300V Max | | **Temperature Coefficient** | ±100 ppm/°C | | **Operating Temp Range** | -55°C to +125°C | --- ## 2. Key Internal Parts & Construction The "3402-R" series is built to withstand environmental stress while maintaining electrical accuracy. ### A. Resistive Element Most versions use a **Cermet** (Ceramic-Metal) element. This material provides: * Low noise during adjustment. * High thermal stability. * Long-term reliability compared to carbon film. ### B. Termination (The "R" Suffix) In electronic part numbering, the **-R** suffix often denotes: * **RoHS Compliance:** Lead-free construction. * **Packaging:** Supplied in Tape & Reel (R) for automated pick-and-place assembly. ### C. Housing The body is usually made of a molded flame-retardant plastic or a ceramic substrate, ensuring insulation and protection against soldering heat. --- ## 3. Common Applications Due to its precision, the 3402-R is found in the following circuits: 1. **Voltage Dividers:** Providing stable reference voltages. 2. **Gain Control:** Adjusting the feedback loop in Operational Amplifiers (Op-Amps). 3. **Calibration:** Used in industrial sensors to "zero out" offsets. 4. **Medical Equipment:** High-reliability diagnostic tools. --- ## 4. Part Number Breakdown Example If we look at a standard Bourns-style nomenclature: ```text 3402 - R - 103 | | | Series | Resistance Code (10 + 3 zeros = 10,000 ohms) | RoHS/Reel Packaging ```