Coils & Chokes

DR Chokes

Also listed as DR Coils

Drum core, high saturation current

A DR choke winds magnet wire onto a drum-shaped core — a cylindrical bobbin with a flange at each end — rather than a closed ring. The open magnetic path gives up some of the EMI performance of a toroid, but it lets the core run at a higher flux density before saturating, which is why drum-core construction is chosen where the current carries a large ripple or surge component on top of a DC bias, such as at a rectifier output. The drum shape is also a simple, machine-windable bobbin, which keeps the part compact and repeatable at volume. DR chokes are specified by inductance, rated current, and saturation current together, since the saturation point — not the DCR — is usually the limiting factor in a rectifier or power-conversion circuit.

Insulation

Enamelled magnet wire wound onto the drum core, with an oven-dried varnish impregnation over the finished winding for mechanical stability and moisture resistance.

Two through-hole DR chokes wound on ferrite drum cores

Specifications

What a part in this family is specified by, and the two ways to get the figures for yours.

Specified by

A part in this family is pinned down by the figures below. Quote the ones your design fixes and we will confirm the rest.

Inductance
Rated current
Saturation current
DCR
Dimensions

Two ways to get the numbers

Catalog datasheet
The factory's product catalog, covering the line as a whole. Per-family datasheets are not published separately.
Go to the datasheet
Your requirement, our part number
Send the rating, voltages, footprint, and termination you need. We come back within 48 hours with a part number and the figures behind it.
Send a requirement

Per-part specifications for the DR Chokes series are not listed on this page yet. Confirm the inductance, rated current, saturation current, and DCR for a specific part number with a quote through the custom inquiry.