The **HC8-330-R** is a high-current, power inductor typically used in DC-DC converters and voltage regulator modules (VRMs). It is part of the **HC8 Series** manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. --- ### 1. Technical Specifications The part number follows a specific nomenclature where "330" refers to the inductance and "R" indicates RoHS compliance. | Parameter | Value | Description | | :--- | :--- | :--- | | **Inductance** | 33.0 µH | The nominal inductance value. | | **Tolerance** | ±20% | Standard variance in inductance. | | **Current Rating (Irms)** | ~5.3 Amps | Continuous current causing a 40°C temperature rise. | | **Saturation Current (Isat)** | ~8.0 Amps | Peak current before inductance drops significantly. | | **DC Resistance (DCR)** | ~43.0 mΩ | Typical internal resistance of the copper winding. | | **Operating Temp** | -40°C to +125°C | Thermal range including self-heating. | --- ### 2. Physical Characteristics The HC8 series is known for its rugged construction and efficient use of space. * **Core Material:** Powered iron (or similar magnetic alloy), which offers high saturation flux density. * **Mounting Type:** Surface Mount Device (SMD). * **Shielding:** It is a **magnetically shielded** design, which minimizes Electromagnetic Interference (EMI) to surrounding components. * **Form Factor:** Approx. 10.9mm x 10.4mm with a height of 4.0mm (standard HC8 package size). --- ### 3. Key Electronic Functions The HC8-330-R performs several critical roles in a circuit: 1. **Energy Storage:** In switching power supplies, it stores energy in its magnetic field during the "on" cycle and releases it during the "off" cycle. 2. **Ripple Filtering:** It smoothes out the output current, reducing the "noise" or ripple voltage in high-frequency circuits. 3. **Current Limiting:** Due to its inductive reactance, it opposes sudden changes in current, protecting sensitive downstream components. --- ### 4. Common Applications * **Multi-phase Regulators:** Found in PC motherboards and servers. * **Point-of-Load (POL) Converters:** Used for local voltage regulation near high-speed CPUs or FPGAs. * **Battery Powered Systems:** Where high efficiency and low DCR are required to extend battery life. * **Distributed Power Systems:** Industrial 12V or 24V bus regulation.