Overview of Coilcraft “Mini Spring” Air Core Inductors
Coilcraft’s “Mini Spring” Air Core Inductors are high-performance, surface mount components designed to provide an extremely high Q over a broad frequency range. These inductors are encased in a high-temperature material ensuring mechanical stability and precise tolerances, which also facilitates a flat top suitable for automatic placement. The leads of the inductors are tinned for reliable soldering, and the unique “spring” structure underscores their innovative design tailored for advanced applications.
Product Specifications and Features
The datasheet specifies a range of inductors, listing their part numbers, inductance values, tolerance levels, quality factor (Q), self-resonant frequencies (SRF), direct current resistance (DCR), and maximum current rating (Ipc). The inductance values are measured using specialized equipment such as the HP4286 with Coilcraft SMD-A fixture and correlated with designated test fixtures for Q and SRF. Inductance tolerance options are 10% and 5%, with the stocked tolerances highlighted for immediate shipment availability.
Operating Conditions and Environmental Data
Coilcraft “Mini Spring” inductors operate within a temperature range of -40°C to +125°C. A separate document, “Spring Inductors Product Specifications” (Document Number omitted), is referenced for comprehensive environmental data.
Design and Packaging
Appropriate typical land patterns are provided in the datasheet for two sizes, A and B, to aid in the design and layout of printed circuit boards (PCBs). These patterns specify pad sizes and strip length tolerances for effective mounting. Further information on packaging is directed to “Tape and Reel Specifications” (Document 173), which details the standard EIA tape and reel packaging for different sizes and capacities of Coilcraft’s air core inductors.
Designer’s Kit and Ordering Information
For engineers and designers, Coilcraft offers a Designer’s Kit C102, which includes samples of all the standard parts listed in the datasheet. Detailed ordering instructions emphasize the inclusion of the inductance tolerance number to specify the desired tolerance level.
Additional Resources
The datasheet for Coilcraft’s “Mini Spring” Air Core Inductors was revised on November 19, 1997, but contact and resource information such as phone, fax, email, and the Coilcraft website are provided for further assistance and data access. This indicates that the company values customer support and easy access to technical information.
Performance Graphs
Lastly, graphs illustrating typical inductance (L) versus frequency and Q versus frequency relationship for the series are included. These visual aids enable users to gain insights into the performance characteristics and aid in selecting the right inductor for specific applications.
References:
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