The **RG3-504S-R15** is a high-precision, thin-film chip resistor array manufactured by **Susumu**. It belongs to the **RG series**, which is renowned for its ultra-reliability and stability in precision electronic circuits. --- ## 1. Technical Specifications The part number follows a specific nomenclature used by Susumu to define its electrical characteristics: | Parameter | Specification | Description | | :--- | :--- | :--- | | **Type** | RG3-504S-R15 | 4-element resistor array | | **Resistance Value** | 500kΩ | Indicated by "504" (50 x 10^4) | | **Tolerance** | ±0.1% | High precision (S-grade) | | **TCR** | ±10 ppm/°C | Temperature Coefficient of Resistance | | **Power Rating** | 0.1W per element | 0.25W total for the package | | **Voltage Rating** | 100V | Maximum operating voltage | | **Operating Temp** | -55°C to +155°C | Wide industrial/military range | --- ## 2. Key Features & Construction The RG3-504S-R15 is not a standard thick-film resistor; it utilizes advanced thin-film technology to achieve superior performance. * **Thin-Film Technology:** Uses a NiCr (Nickel-Chromium) alloy film deposited on a ceramic substrate. This provides lower noise and better stability over time compared to thick-film resistors. * **Resistor Array (Network):** It contains four independent resistors in a single 1206-sized (metric 3216) surface mount package. * **Sulfur Resistance:** The inorganic passivation layer makes it highly resistant to sulfurization, preventing failures in harsh environments. * **Low Noise:** Excellent signal-to-noise ratio, making it ideal for audio and sensitive measurement circuits. --- ## 3. Common Applications Due to its high precision and stability, this component is typically found in: 1. **Instrumentation:** Used in gain-setting for operational amplifiers where matching is critical. 2. **Medical Electronics:** Used in diagnostic equipment requiring long-term reliability. 3. **Industrial Controls:** Feedback loops for high-precision motor controllers or power supplies. 4. **Automotive:** High-reliability sensors and ECU (Engine Control Unit) circuitry. --- ## 4. Equivalent Part Structure If searching for variations, the part number is broken down as follows: * **RG3:** Series name (3-terminal/array type). * **504:** 50 followed by 4 zeros (500,000 Ohms). * **S:** Tolerance code (±0.1%). * **R15:** Packaging code (Tape and Reel specifications).