The part number **RL07S4R3JB14** (specifically the RL07 series) refers to a **Metal Film Resistor** designed for high-reliability or military-standard applications. These are typically used in circuits requiring precision and stability under varying environmental conditions. Below is the technical breakdown of the component characteristics: ### 1. Technical Specifications | Parameter | Value / Detail | | :--- | :--- | | **Component Type** | Fixed Resistor (Through-hole) | | **Material** | Metal Film | | **Resistance Value** | 4.3 $\Omega$ (indicated by "4R3") | | **Tolerance** | $\pm$ 5% (indicated by "J") | | **Power Rating** | 0.25 Watts (1/4 W) at 70°C | | **Package Style** | Axial Leaded (RL07 MIL-style) | | **Temperature Coefficient** | Typically $\pm$ 200 ppm/°C | --- ### 2. Part Number Breakdown To understand the specific properties, we can dissect the manufacturer code: * **RL07:** The military designation size. It corresponds to a standard 1/4 watt size resistor. * **S:** Terminal type (Solderable). * **4R3:** The resistance value. The "R" acts as a decimal point, signifying **4.3 Ohms**. * **J:** Tolerance code. **J** stands for **$\pm$ 5%**. * **B14:** Packaging code (usually refers to bulk packaging or a specific tape and reel format). --- ### 3. Key Features * **Stability:** Metal film technology offers better stability and lower noise than carbon composition resistors. * **Durability:** Designed to meet or exceed MIL-PRF-22684 standards, making them suitable for industrial and defense applications. * **Flameproof Coating:** Most RL series resistors utilize a coating that is resistant to environmental moisture and flame. --- ### 4. Common Applications Due to its low resistance (4.3 $\Omega$) and 1/4W power rating, this part is commonly used for: 1. **Current Sensing:** Small voltage drop measurement in low-power circuits. 2. **Impedance Matching:** Used in audio or RF signal paths to match line characteristics. 3. **Snubber Circuits:** Used in conjunction with capacitors to suppress voltage spikes. 4. **Legacy Repairs:** Frequent in older telecommunications and military hardware. ---