The **HVF-35-R** is a specialized high-voltage electronic component, typically categorized as a **High Voltage Rectifier Diode** or a **High Voltage Focus Resistor/Assembly**, commonly used in CRT (Cathode Ray Tube) power supplies, laser equipment, and X-ray systems. Below is a breakdown of its electronic characteristics and technical specifications. --- ## 1. Technical Specifications The "HVF" series generally denotes High Voltage Focus or Fast-recovery components. While specific manufacturers (like Murata or Dean Technology) may vary slightly, the general parameters for the HVF-35-R are as follows: | Parameter | Typical Value | | :--- | :--- | | **Peak Inverse Voltage (PIV)** | 35,000 Volts (35kV) | | **Forward Current (If)** | 5mA - 10mA | | **Recovery Time (Trr)** | Fast Recovery (<100ns) | | **Mounting Type** | Through-Hole / Axial Lead | | **Operating Temperature** | -55°C to +125°C | --- ## 2. Key Electronic Features ### A. High Dielectric Strength The device is encased in a high-grade epoxy resin or ceramic housing to prevent **corona discharge** or arcing. At 35kV, electricity can jump through the air; the physical design of the HVF-35-R ensures insulation against such leakage. ### B. Fast Recovery Characteristics The "Fast Recovery" nature allows the part to switch from a conducting state to a non-conducting state very quickly. This is critical in high-frequency power supplies (like Flyback transformers) to maintain efficiency and reduce heat buildup. ### C. Avalanche Capability Many parts in this series are designed with controlled avalanche characteristics, meaning they can withstand brief over-voltage transients without permanent crystalline damage to the semiconductor material. --- ## 3. Common Applications The HVF-35-R is primarily used where high DC voltage needs to be maintained or rectified from an AC source: * **CRT Displays:** Used in the focus or anode voltage circuitry for high-resolution monitors. * **Air Purifiers:** High-voltage ion generators. * **Medical Equipment:** Small-scale X-ray power supplies. * **Laser Power Supplies:** Providing the ignition voltage for CO2 or HeNe lasers. --- ## 4. Safety and Handling Because this part deals with **35,000 Volts**, specific precautions must be taken: 1. **Creepage Distance:** Ensure adequate PCB spacing between the leads to prevent surface tracking. 2. **Potting:** In many designs, the part is submerged in silicone oil or potted in epoxy to further insulate it. 3. **Discharge:** Capacitors connected to this diode can hold a lethal charge long after power is removed.