The **KHS800JB-AX-R1AA** is a specialized high-power electronic component, specifically a **Wirewound Resistor** manufactured by **Yageo**. This part belongs to the KHS series, which is known for its high power rating and "vertical" mounting style. ### 1. Part Number Breakdown Understanding each segment of the part number reveals its specific electrical characteristics: | Segment | Meaning | Specification | | :--- | :--- | :--- | | **KHS** | Series Name | High Power Wirewound (Vertical Type) | | **800** | Power Rating | 8 Watts (at 70°C) | | **J** | Tolerance | ±5% | | **B** | Packaging Code | Bulk | | **AX** | Lead Style | Axial / Formed Leads (Specific to KHS spacing) | | **R1** | Resistance Value | 0.1 Ohms (Ω) | | **AA** | Special Code | Internal Factory Version/Designation | --- ### 2. Technical Specifications The core electrical and physical parameters are as follows: * **Resistance:** 0.1 Ω (very low resistance, often used for current sensing). * **Power Dissipation:** 8 Watts (Continuous). * **Dielectric Withstanding Voltage:** 1,000V AC. * **Temperature Coefficient (TCR):** ±400 ppm/°C (Typical for low-value wirewounds). * **Core Material:** Ceramic rod with a wirewound element. * **Coating:** Flameproof inorganic silicone coating (White/Grey finish). --- ### 3. Key Applications Due to its 8W power rating and very low resistance (0.1Ω), this part is commonly used in the following circuits: 1. **Current Sensing:** Placed in series with a load to measure current by monitoring the small voltage drop across the 0.1Ω resistance. 2. **Power Supplies:** Used as a "Soft Start" resistor to limit inrush current or as a bleeder resistor. 3. **Motor Controllers:** High-wattage handling makes it suitable for snubbers and motor braking circuits. 4. **Audio Equipment:** Sometimes used in crossover networks or output stages where high power handling is required. --- ### 4. Physical Design Features The "KHS" series is distinct because it is often designed to stand **vertically** on a PCB or uses a specific lead forming (`AX`) to ensure proper heat dissipation. This prevents the high heat generated by the resistor (up to 200°C+ at full load) from damaging the PCB surface. ---