The **SD12-220-R** is a high-performance, low-profile power inductor manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). It is part of the SD series, which is specifically designed for high power density and space-constrained applications. --- ## 1. Technical Specifications The following table highlights the primary electrical characteristics of the SD12-220-R: | Parameter | Value | | :--- | :--- | | **Inductance** | 22.0 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 0.81 Amps | | **Saturation Current (Isat)** | 0.72 Amps | | **DC Resistance (DCR)** | 0.407 Ohms (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetically Shielded | --- ## 2. Key Physical Features The "SD12" designation refers to the physical dimensions of the component, which is crucial for PCB layout: * **Footprint:** Approximately 5.2mm x 5.2mm. * **Height:** 1.2mm (Low profile), making it ideal for ultra-thin devices like tablets or slim industrial sensors. * **Construction:** Ferrite drum core with a magnetic shield to minimize Electromagnetic Interference (EMI). * **Mounting:** Surface Mount Device (SMD). --- ## 3. Component Breakdown The part number **SD12-220-R** can be decoded as follows: 1. **SD:** Product Series (Shielded Drum). 2. **12:** Size code (refers to the 1.2mm height). 3. **220:** Inductance value (22 followed by 0 zeros = 22 µH). 4. **-R:** RoHS compliant / Lead-free. --- ## 4. Typical Applications Because of its small size and shielded nature, this inductor is commonly used in: * **DC-DC Converters:** Buck, boost, and SEPIC topologies. * **Portable Electronics:** Smartphones, wearables, and handheld GPS units. * **LED Drivers:** Providing stable current for lighting applications. * **Noise Filtering:** Acting as a low-pass filter in power supply lines to reduce ripple. ---