B64290-A38-X830 EPCOS Inc, B64290-A38-X830 Datasheet - Page 4

• Manufacturer Part Number: B64290-A38-X830
• Manufacturer: EPCOS Inc

Specifications of B64290-A38-X830

• Lead Free Status / RoHS Status: Compliant

For cores with high permeability, increased spread of the A
pected due to the polyamide coating (K version). This effect can be avoided by using an epoxy resin
coating (L version).
For small ring cores, we have introduced a parylene coating (Galxyl) which features a low coating
thickness and high dielectric strength.
Versions
Version
4
Ring Cores
Our product line includes a wide range of ring cores with finely graded diameters ranging from
2,5 to 200 mm (see overview of available types). Other core heights can be supplied on request.
All cores are available in the usual materials.
Ring cores are available in different coating versions, thus offering the appropriate solution for
every application. The coating not only offers protection for the edges but also provides an
insulation function.
The following test setup is used to test the dielectric strength of the insulating coating: A copper
ring is pressed to the top edge of the ring. It touches the ferrite ring at the edges (see diagram).
The test duration is 2 seconds; the test voltages specified in the table are minimum values:
Metal poles
Ring cores are used primarily for pulse and broadband transformers, baluns and chokes. Owing
to the magnetically closed circuit, high flux densities can be achieved at small volume. Magnetic
leakage is negligible.
Ring cores are also increasingly used for power applications. Here, the typical values for ampli-
tude permeability and power loss, as summarized in the section on SIFERRIT materials (Data
Book "Ferrites and Accessories", 1997), are applicable to the special power materials.
In the list of preferred types, the A
is also specified for power applications, in addition to a limiting value for power loss under the
relevant measurement conditions. This provides a guarantee of the minimum amplitude perme-
ability.
Characteristic data for cores not included among the preferred types are available on request.
Uncoated
Coated with polyamide; thickness of coating approx. 0,2 to 0,4 mm
Coated with parylene; thickness of coating approx. 10 to 15 m,
standard coating for small cores ( R 4
Coated with epoxy resin; thickness of coating approx. 0,15 to 0,3 mm,
coating for cores
Ferrite ring
R 30
L1min
value (measurement conditions 320 mT, 100 °C, 10 kHz)
3.97
U
rms
L
values of several percent must be ex-
Core size
R 4 thru R 10
R 12,5 thru R 20
> R 20
Siemens Matsushita Components
Ordering code
B64290-A...
B64290-K...
B64290-P...
B64290-L...
U
1,0 kV
1,5 kV
2,0 kV
rms