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RM cores

RM cores (rectangular module) are used for the design of inductors with low stray fields. Each RM coil consists of 2 RM cores, the coil, using single or multi-section coilformers which simultaneously adopt the function of soldering pin carriers, and two retaining clamps.

The use of RM cores in inductors is particularly advantageous to the user with regard to the high packing density possible on the pc board, with the additional benefit of low stray field due to the closed desgin, frequency selectivity and electrical stability.

The dimensions of RM cores are adjusted to the basic grid of pc boards, i.e. to the modular grid length of 2.54 mm. RM 6 thus means that the core with coilformer occupies a quadratic area of 6 x 6 x 2.542 mm².

The cores without a center hole are recommended for applications in power electronics, for example as transformers or flyback transformers in SMPS. Compared with those with a center hole, these cores have a higher effective magnetic cross-section and allow higher power ratings at a higher AL value.

In addition to the use of RM cores as power transformers, the main area of application is the design of frequency-selective components, especially in the form of filter coils with a high Q value and low noise wideband transformers for applications in the range of small excitations. RM cores with dimensions RM 6 are classified with the group of SMD components (surface mounted devices).

The RM cores supplied are in compliance with IEC 60431.

For applications where multilayer coils are used or where the core is mounted directly onto the PC board, planar RM cores with a drastically reduced height („low profile“) in comparison to conventional RM cores are available.

In addition to the standard low profiles cores, Kaschke offers further reduced core heights up to a RM plate (analogue to planar I cores) on request.


RM cores without center hole
Type Drw. no. nominal AL values / nH datasheet
K2006 K2008 K4000
RM 5 1 1900 2050 3000 PDF Icon
RM 6 1 2300 2450 4350 PDF Icon
RM 8 1 3000 3450 5250 PDF Icon
RM 10 1 4650 5050 8100 PDF Icon
RM 12 1 5400 5900 8500 PDF Icon
RM 14 1 6100 6650 11400 PDF Icon
RM cores „low Profile“
Type Drw. no. nominal AL values / nH datasheet
K2001 K2006 K2008
RM 5 1 1850 2550 2700 PDF Icon
RM 6 1 2250 3150 3350 PDF Icon
RM 8 1 3000 4150 4700 PDF Icon
RM 10 1 4250 6150 6650 PDF Icon
RM 12 1 4900 7150 7850 PDF Icon
RM 14 1 5500 8000 8800
Drawing 1
RM Core

Kaschke Components GmbH • Kaschke Components GmbH • Rudolf-Winkel-Str. 6 • 37079 Göttingen • Telefon +49 551 5058 6 • Telefax +49 551 65756