Chip inductors max inductance, reduce DCR in 0402-sized RF chokes

August 05, 2015 // By Graham Prophet
Developed for use in mobile devices and cellular infrastructure equipment, Coilcraft’s 0402DF Series chip inductors offer higher inductance values and significantly lower DC resistance than other 0402-sized inductors, for RF choke and filtering applications.

The 0402DF Series is offered in 25 inductance values ranging from 20 to 3300 nH, with a 5% tolerance for all values. It offers the lowest DC resistance currently available in a 0402 package. For example, the DCR of the 220 nH value is 0.240 Ohms - 55% lower than the same value in Coilcraft’s 0402AF Series - suiting it for use as a harmonic filter element for NFC applications.

0402DF Series inductors can also be used as a filter element in bandstop and low pass filters, a one-pole filter or RF choke in cellular bands, and for ground-to-ground isolation. They feature a ferrite construction for high current handling.