The **RG3-203N-R15** is a high-precision, thin-film chip resistor array manufactured by **Susumu**. It belongs to the **RG series**, which is renowned for its excellent reliability, low noise, and high stability under harsh environmental conditions. --- ### 1. General Specifications The part number indicates specific characteristics regarding its dimensions, resistance, and tolerance. | Parameter | Specification | | :--- | :--- | | **Manufacturer** | Susumu | | **Series** | RG Series (High Reliability Thin Film) | | **Type** | Resistor Network / Array | | **Resistance Value** | 20k $\Omega$ (indicated by "203") | | **Tolerance** | $\pm 0.1\%$ (indicated by "B" or "N" depending on specific datasheet revision) | | **Power Rating** | ~0.063W (1/16W) per element | | **Operating Temp** | -55°C to +155°C | --- ### 2. Key Electronic Characteristics #### A. Thin Film Technology Unlike standard thick film resistors, the RG series uses a thin metal film deposited on a ceramic substrate. This results in: * **Low Noise:** Ideal for audio and precision signal processing. * **High Stability:** Minimal resistance drift over the component's lifetime. * **Tight Tolerance:** Allows for highly accurate voltage division. #### B. Temperature Coefficient of Resistance (TCR) The "R15" suffix often relates to the TCR or specific packaging/tracking requirements. In this series, the TCR is typically as low as **$\pm 5 \text{ ppm/}^\circ\text{C}$ to $\pm 25 \text{ ppm/}^\circ\text{C}$**, ensuring the resistance value remains constant even as the circuit heats up. #### C. Sulfur Resistance The RG series is designed to be inorganic and passivated, making it highly resistant to "sulfur attack" (corrosion), which is a common failure point in industrial or automotive electronics. --- ### 3. Internal Configuration As a "Network" part, the RG3-203N typically contains multiple resistors within a single SMD (Surface Mount Device) package. * **Package Size:** Usually 1206 (3216 Metric) or similar, containing 2 to 4 resistive elements. * **Ratio Matching:** Because the resistors are etched onto the same substrate, they track each other perfectly across temperature changes, which is critical for **Operational Amplifier** circuits. --- ### 4. Applications Due to its precision and stability, this part is commonly found in: 1. **Automotive Electronics:** Control units and sensors. 2. **Test & Measurement:** Multimeters and signal generators. 3. **Medical Equipment:** Monitoring devices requiring high signal integrity. 4. **Industrial Automation:** High-precision PLC analog inputs.