Air Core Inductors Feature Square Profile, High Q and Tiny Footprint

Coilcraft’s new 1111SQ series high-performance, square air core inductors offer exceptionally high Q factors, up to 200 at 400 MHz, and inductance values from 27 nH to 47 nH.

The 1111SQ series is available in seven models with footprints from 2.67 mm by 2.67 mm. The spring was engineered to have a unique, square shape that has been optimized for co-planarity, resulting in a flat top and bottom for reliable pick and place operation and mechanical stability on the PC board. Solder-coated leads also ensure improved solderability.

These latest additions to Coilcraft’s growing line of high-frequency square air core inductors offer current ratings to 5.5 A, making them suitable for use as chokes in high-current RF power amplifiers for cellular towers and high-power radar. Their combination of performance, inductance values, and tolerances as tight as 2 percent also make them ideal components in DOCSIS (Data Over Cable Service Interface Specification) applications such as set-top boxes and cable modems.

Complete technical details and free evaluation samples are available here.

Parts are available from stock and can be ordered on-line at or by calling a local Coilcraft sales office. Pricing at 1,000 pieces is $0.59 for the 1111SQ with 5 percent tolerance and $0.68 each for 2 percent tolerance.