The **RG3-105S-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 exceptional reliability, low noise, and high stability under harsh conditions. --- ### 1. Key Technical Specifications Below are the primary electronic characteristics of the RG3-105S-R15: | Parameter | Value / Specification | | :--- | :--- | | **Resistance** | 1.05M $\Omega$ (Megaohms) | | **Tolerance** | ±0.05% (Ultra-precision) | | **Power Rating** | 0.25W (1/4 Watt) | | **Temperature Coefficient (TCR)** | ±5 ppm/°C | | **Case Size (Imperial)** | 1206 | | **Max Operating Voltage** | 150V | | **Operating Temperature** | -55°C to +155°C | --- ### 2. Core Electronic Features #### A. Thin-Film Technology Unlike standard thick-film resistors, the RG series uses a **metal film** deposited on a ceramic substrate. This results in: * **Lower Noise:** Ideal for sensitive analog circuits. * **Better Linearity:** Maintains resistance accuracy across different voltages. #### B. Ultra-Low TCR (±5 ppm/°C) The Temperature Coefficient of Resistance (TCR) is one of this part's most critical features. A rating of **5 ppm/°C** means the resistance value changes by only 5 parts per million for every degree Celsius change in temperature. This ensures the circuit remains stable even as the device heats up. #### C. High Reliability & Anti-Sulfur The "S" in the part number often denotes specialized inorganic passivation. This protects the resistive element from environmental hazards like sulfurization, which is a common cause of failure in standard resistors used in industrial or automotive environments. --- ### 3. Typical Applications Due to its high precision and stability, the RG3-105S-R15 is commonly used in: * **Medical Instrumentation:** Where precise signal measurement is life-critical. * **Automotive Electronics:** Sensors and control units requiring long-term stability. * **Test and Measurement:** Multimeters, oscilloscopes, and laboratory-grade power supplies. * **Industrial Automation:** High-accuracy PLC analog input modules. --- ### 4. Part Number Breakdown `RG 3216 N - 1054 - W - T5` (Standard Susumu Format Reference) * **RG:** Series Name (Reliability Thin Film) * **3216:** Metric size (Equivalent to 1206 Imperial) * **105:** The base resistance value. * **S/R15:** Specific tolerance and TCR coding (R15 typically refers to the high-precision TCR rating).