The **RG3-305N-R15** is a high-precision, thin-film chip resistor manufactured by **Susumu**. It belongs to the **RG series**, which is widely recognized in the electronics industry for its high reliability, low noise, and excellent stability under harsh environmental conditions. --- ## 1. Technical Specifications The following table summarizes the core electronic characteristics of the RG3-305N-R15: | Parameter | Specification | Notes | | :--- | :--- | :--- | | **Resistance Value** | 30.5 $\Omega$ | Indicated by the "305" code | | **Tolerance** | ±0.05% | High precision (Code "N") | | **Power Rating** | 0.25 W (1/4 W) | Rated at 70°C | | **Temperature Coefficient (TCR)** | ±10 ppm/°C | Extremely stable against heat (Code "R") | | **Package Size** | 1206 (Metric 3216) | 3.2mm x 1.6mm | | **Max Operating Voltage** | 150V | Standard for this package size | | **Operating Temp Range** | -55°C to +155°C | Industrial/Military grade | --- ## 2. Key Internal Technologies The "Electronic Parts" within this resistor are built using specific materials and architectural choices that differentiate it from standard thick-film resistors: ### A. Thin-Film Inorganic Passivation Unlike standard resistors that use organic coatings, the RG series uses an **inorganic silica-based passivation layer**. This provides: * **Sulfur Resistance:** Prevents corrosion in polluted environments. * **Moisture Resistance:** Ensures the resistive element does not degrade in high humidity. ### B. Metal Film Element The resistive material is a specialized metal alloy deposited via sputtering. This results in **ultra-low noise** (low current noise) and high linearity, making it ideal for precision analog circuits. --- ## 3. Part Number Breakdown Understanding the nomenclature helps identify the specific electronic capabilities: | Code Segment | Meaning | Detail | | :--- | :--- | :--- | | **RG** | Series Name | High precision, thin film | | **3216 (3)** | Case Size | 3.2 x 1.6mm (1206) | | **305** | Resistance | 30.5 Ohms | | **N** | Tolerance | ±0.05% | | **R** | TCR | ±10 ppm/°C | | **15** | Packaging | Typically refers to taping/reel quantity | --- ## 4. Common Applications Due to its high precision and low temperature drift, the RG3-305N-R15 is typically found in: 1. **Medical Equipment:** Precision scanning and monitoring devices. 2. **Test & Measurement:** Oscilloscopes and multimeters where signal integrity is vital. 3. **Automotive Electronics:** Sensors and ECU circuits that require long-term stability. 4. **Industrial Automation:** High-accuracy PLC analog input modules. ---