The 105R-222K 105R series from API Delevan, Inc., is a set of fixed inductors designed for RF and high-frequency applications. These components come in a compact chip SMT (Surface Mount Technology) format, making them ideal for space-constrained PCB designs. They are rated at 2.2µH with a tolerance of ±10%, which provides a good balance between inductance stability and component size.

These inductors show up frequently in RF circuits, particularly in filters, oscillators, and impedance matching networks. Their low DC resistance of 1.7Ω is beneficial for reducing power losses in high-frequency applications. Engineers tend to reach for these when they need a reliable, small-footprint inductor that can handle RF signals without significant loss or distortion.

One practical observation is that these inductors perform well in environments where thermal stability is important. Their small size means they can be closely packed on a PCB, which can be advantageous in densely populated RF modules. Another useful feature is their ability to maintain consistent inductance over a wide temperature range, which is crucial in RF circuits where performance can be highly sensitive to temperature variations.