The **RG3-310S-R15** is a high-precision, thin-film chip resistor array manufactured by **Susumu**. It is part of the RG series, which is renowned in the electronics industry for its high reliability, low noise, and excellent stability under harsh environmental conditions. --- ### 1. Key Technical Specifications | Parameter | Specification | |:---|:---| | **Resistance Value** | 100 $\Omega$ (indicated by the '3-310' series code) | | **Tolerance** | ±0.1% (Ultra-precision) | | **Power Rating** | 0.063W (1/16W) per element | | **Temperature Coefficient (TCR)** | ±25 ppm/°C | | **Operating Temperature** | -55°C to +155°C | | **Package Style** | 1206 (3216 Metric) - Convex Terminal | | **Number of Resistors** | 3-element configuration | --- ### 2. Core Electronic Components & Construction #### Thin-Film Technology Unlike standard thick-film resistors (which use a paste), the RG series uses **thin-film metal foil** sputtered onto a high-grade ceramic substrate. * **Precision:** This allows for much tighter tolerances (down to 0.1%). * **Stability:** The inorganic thin-film material is highly resistant to drift caused by heat or moisture. #### Sulfur Resistance The "R" in the suffix typically denotes **Sulfur Resistance**. In industrial environments where sulfur is present (from pollution or rubber materials), standard resistors can undergo "sulfuration" where the silver electrodes turn into silver sulfide, causing open circuits. The RG3-310S-R15 uses specialized materials to prevent this corrosion. #### Internal Structure * **Substrate:** Alumina ceramic. * **Resistive Element:** Nickel-Chromium (Ni-Cr) alloy. * **Protection:** Inorganic glass coating for superior moisture resistance compared to organic resins. --- ### 3. Application Use-Cases The electronic properties of this part make it suitable for specific high-performance circuits: 1. **Instrumentation Amplifiers:** Because the resistors are integrated into a single array, they exhibit excellent **tracking** (they heat up and cool down together), which maintains the common-mode rejection ratio (CMRR). 2. **Voltage Dividers:** Used where a precise ratio between voltage levels must be maintained despite temperature fluctuations. 3. **Automotive Electronics:** Its sulfur resistance and high-temperature rating make it ideal for under-the-hood sensors and control units. 4. **Medical Equipment:** Low-noise characteristics are vital for high-gain diagnostic sensors. --- ### 4. Part Number Breakdown | Segment | Meaning | |:---|:---| | **RG** | Series Name (High reliability thin film) | | **3** | Number of resistors in the array | | **310S** | Internal design code for resistance value and layout | | **R15** | Packaging/Tolerance/TCR specific designation |