Ferrites and accessories
Series/Type: RM 6
The following products presented in this data sheet are being withdrawn.
Ordering Code Substitute Product Date of Withdrawal Deadline Last
Orders Last Shipments
B65808S1108D002 B65808N1108D002 2014-11-28 2015-02-28 2015-05-28
B65808P1006D001 B65808N1006D001 2014-11-28 2015-02-28 2015-05-28
B65808P1005D001 B65808N1005D001 2014-11-28 2015-02-28 2015-05-28
Ordering Code Substitute Product Date of Withdrawal Deadline Last
Orders Last Shipments
B65808P1004D001 B65808N1004D001 2014-11-28 2015-02-28 2015-05-28
For further information please contact your nearest EPCOS sales office, which will also support you in selecting a suitable substitute. The
addresses of our worldwide sales network are presented at www.epcos.com/sales.
206/13
Please read Cautions and warnings and
Important notes at the end of this document.
Example of an assembly set
Individual parts Part no. Page
Adjusting screw B65659 11
Core B65807 3
Clamps B65808 9
Insulating washer 1 B65808 9
Coil former B65808 5, 6
Core B65807 3
Threaded sleeve (glued-in)
Insulating washer 2 B65808 9
Also available: Coil former for SMPS transf. B65808 7
Coil former for
power applications
B65808
8
SMD coil former B65821 10
Clamp B65808 10
RM 6 low profile:
Core B65807P 12
Core and accessories
RM 6
306/13
Please read Cautions and warnings and
Important notes at the end of this document.
■To IEC 62317-4
■Core without center hole
for transformer applications
■Delivery mode: sets
Magnetic characteristics (per set)
Approx. weight (per set)
Gapped
with
center hole
without
center hole
l/A
le
Ae
Amin
Ve
0.86
26.9
31.3
—
840
0.78
28.6
36.6
31
1050
mm–1
mm
mm2
mm2
mm3
m4.9 5.1 g
Material AL value
nH
s
approx.
mm
eOrdering code 1)
-J without center hole
-N with threaded sleeve
-C with center hole
K1 40 3% 0.80 27.4 B65807+0040A001
M33 633% 0.60 43.2 B65807+0063A033
100 3% 0.38 68.5 B65807+0100A033
N48 160 3% 0.22 109 B65807+0160A048
250 3% 0.12 171 B65807+0250A048
315 3% 0.08 215 B65807+0315A048
400 3% 0.05 274 B65807+0400A048
N41 250 3% 0.17 155 B65807J0250A041
1) Replace the + by the code letter “C” or “N” for the required version. Standard version is “C”.
B65807Core
RM 6
406/13
Please read Cautions and warnings and
Important notes at the end of this document.
Ungapped
Material AL value
nH
ePV
W/set
Ordering code
-C with center hole
-J without center hole
N48 2200 +30/–20% 1500 B65807C0000R048
N45 3500 +30/–20% 2180 B65807J0000R045
N30 4300 +30/–20% 2670 B65807J0000R030
T35 6200 +30/–20% 3860 B65807J0000R035
T38 8600 +40/–30% 5350 B65807J0000Y038
T66 12300 +40/–30% 7650 B65807J0000Y066
N49 1700 +30/–20% 1060 < 0.15 ( 50 mT, 500 kHz, 100 C) B65807J0000R049
N87 2400 +30/–20% 1490 < 0.51 (200 mT, 100 kHz, 100 C) B65807J0000R087
N97 2400 +30/–20% 1490 < 0.39 (200 mT, 100 kHz, 100 C) B65807J0000R097
N41 3100 +30/–20% 1930 < 0.16 (200 mT, 25 kHz, 100 C) B65807J0000R041
B65807Core
RM 6
506/13
Please read Cautions and warnings and
Important notes at the end of this document.
Coil former, squared pins
Material: GFR thermosetting plastic (UL 94 V-0, insulation class to IEC 60085:
H max. operating temperature 180 C), color code black
Sumikon PM 9630 ® E41429 (M), SUMITOMO BAKELITE CO LTD
Solderability: to IEC 60068-2-20, test Ta, method 1 (aging 3): 235 C, 2 s
Resistance to soldering heat: to IEC 60068-2-20, test Tb, method 1B: 350 C, 3.5 s
Winding: see Data Book 2013, chapter “Processing notes, 2.1”
For matching clamp and insulating washers see page 9.
Sections AN
mm2
lN
mm
AR value

Pins Ordering code
115 30 69 4B65808N1004D001
5B65808N1005D001
6B65808N1006D001
214 30 73 4B65808N1004D002
6B65808N1006D002
B65808Accessories
RM 6
606/13
Please read Cautions and warnings and
Important notes at the end of this document.
Coil former, pins squared in the start-of-winding area
Material: GFR thermosetting plastic (UL 94 V-0, insulation class to IEC 60085:
H max. operating temperature 180 C), color code white
Bakelite UP 3420 ® E61040 (M), HEXION SPECIALTY CHEMICALS GMBH
Solderability: to IEC 60068-2-20, test Ta, method 1 (aging 3): 235 C, 2 s
Resistance to soldering heat: to IEC 60068-2-20, test Tb, method 1B: 350 C, 3.5 s
Winding: see Data Book 2013, chapter “Processing notes, 2.1”
For matching clamp and insulating washers see page 9.
Sections AN
mm2
lN
mm
AR value

Pins Ordering code
115 30 69 4B65808P1004D001
5B65808P1005D001
6B65808P1006D001
B65808Accessories
RM 6
706/13
Please read Cautions and warnings and
Important notes at the end of this document.
Coil former for SMPS transformers with line isolation
The creepage distances and clearances are designed such that the coil former is suitable for use
in SMPS transformers with line isolation.
■Closed center flange with external wire guide
■Pins squared in the start-of-winding area
■Optimized for use with automatic winding machines
Material: GFR thermosetting plastic (UL 94 V-0, insulation class to IEC 60085:
F max. operating temperature 155 C), color code black
Sumikon PM 9630
® E41429 (M), SUMITOMO BAKELITE CO LTD
Solderability: to IEC 60068-2-20, test Ta, method 1 (aging 3): 235 C, 2 s
Resistance to soldering heat: to IEC 60068-2-20, test Tb, method 1B: 350 C, 3.5 s
Winding: see Data Book 2013, chapter “Processing notes, 2.1”
Sections AN
mm2
lN
mm
AR value

Pins Ordering code
214 30 73 8B65808S1108D002
B65808Accessories
RM 6
806/13
Please read Cautions and warnings and
Important notes at the end of this document.
Coil former for power applications with angled pins
Optimized for automatic winding
Material: GFR polyterephthalate (UL 94 V-0, insulation class to IEC 60085:
F max. operating temperature 155 C), color code black
Valox 420-SE0 ® E45329 (M), GE PLASTICS B V
Solderability: to IEC 60068-2-20, test Ta, method 1 (aging 3): 235 C, 2 s
Resistance to soldering heat: to IEC 60068-2-20, test Tb, method 1B: 350 C, 3.5 s
Winding: see Data Book 2013, chapter “Processing notes, 2.1”
For matching clamp and insulating washer 1 see page 9.
Sections AN
mm2
lN
mm
AR value

Pins Ordering code
115 30 69 8B65808E1508T001
Hole arrangement
View in mounting direction
B65808Accessories
RM 6
906/13
Please read Cautions and warnings and
Important notes at the end of this document.
Clamp
■With ground terminal, made of stainless spring steel (tinned), 0.4 mm thick
■Solderability to IEC 60068-2-20, test Ta, method 1 (aging 3): 235 C, 2 s
■Also available as strip clamp on reels on request
Insulating washer 1 between core and coil former
■For tolerance compensation and for insulation
■Made of polycarbonate (UL 94 V-0, insulation class to IEC 60085: E 120 C), 0.08 mm thick
Aryphan F685, E167358 (M), natural color, LOFO HIGH TECH FILM GMBH
Insulating washer 2 for double-clad PCBs
■Made of polycarbonate (UL 94 V-0, insulation class to IEC 60085: E 120 C), 0.25 mm thick
Makrofol FR7-2, E118859 (M), natural color, BAYER MATERIALSCIENCE AG
Clamp Insulating washer 1 Insulating washer 2
Clamping forces for RM 6
Ordering code
Clamp (ordering code per piece, 2 are required) B65808B2203X000
Insulating washer 1 (reel packing, PU = 1 reel) B65808A5000X000
Insulating washer 2 (bulk) B65808C2005X000
(preliminary data)
Fmin: Extension of clamp from a to a2 = Xmin
Fmax: Extension of clamp from a to a1 = Xmax
Clamp opening a (mm) 9.5 +0.2
Core nose Zmax (mm) 0.22
Height of core pair X (mm)Xmin
Xmax
10.1
10.6
Clamping force F (N) Fmin
Fmax
7
50
B65808Accessories
RM 6
10 06/13
Please read Cautions and warnings and
Important notes at the end of this document.
SMD coil former with gullwing terminals
Material: GFR liquid crystal polymer (UL 94 V-0, insulation class to IEC 60085:
F max. operating temperature 155 C), color code black
Vectra E 130i E106764 (M), POLYPLASTICS CO LTD
Vectra E 130i E83005 (M), TICONA
Solderability: to IEC 60068-2-58, test Td, method 6 (Group 3): 245 C, 3 s
Resistance to soldering heat: to IEC 60068-2-58, test Td, method 6 (Group 3): 255 C, 10 s
permissible soldering temperature for wire-wrap connection on coil former: 400 C,1 s
Winding: see Data Book 2013, chapter “Processing notes, 2.1”
Clamp
■Without ground terminal, made of stainless spring steel, 0.435 mm thick
■Also available as strip clamp on request
Coil former Clamp
Sections AN
mm2
lN
mm
AR value

Terminals Ordering code
116.2 31 66 8B65821C1008T001
Clamp (ordering code per piece, 2 are required) B65808J2204X000
B65821, B65808Accessories
RM 6
11 06/13
Please read Cautions and warnings and
Important notes at the end of this document.
Adjusting screw
■Tube core with thread and core brake made of GFR polyterephthalate
Pocan B3235 ® E245249 (M), LANXESS AG
abc
Figure Tube core Ordering code
length (mm) Material Color code
a2.62 3.6 N22 red B65659F0001X023
b2.75 4.4 N22 black B65659F0003X023
c2.82 4.4 N22 yellow B65659F0004X023
B65659Accessories
RM 6
12 06/13
Please read Cautions and warnings and
Important notes at the end of this document.
■To IEC 62317-4
■For compact transformers
■Without center hole
■Delivery mode: sets
Magnetic characteristics (per set)
l/A = 0.58 mm–1
le= 21.8 mm
Ae= 37.5 mm2
Amin = 31.2 mm2
Ve= 820 mm3
Approx. weight 4.0 g/set
Ungapped
Material AL value
nH
ePV
W/set
Ordering code
T38 10500 +40/–30% 4860 B65807P0000Y038
N49 2200 +30/–20% 1020 < 0.14 ( 50 mT, 500 kHz, 100 C) B65807P0000R049
N92 2300 +30/–20% 1060 < 0.44 (200 mT, 100 kHz, 100 C) B65807P0000R092
N87 3000 +30/–20% 1390 < 0.40 (200 mT, 100 kHz, 100 C) B65807P0000R087
B65807PCore
RM 6 »Low Profile«
13 06/13
Mechanical stress and mounting
Ferrite cores have to meet mechanical requirements during assembling and for a growing number
of applications. Since ferrites are ceramic materials one has to be aware of the special behavior
under mechanical load.
As valid for any ceramic material, ferrite cores are brittle and sensitive to any shock, fast changing
or tensile load. Especially high cooling rates under ultrasonic cleaning and high static or cyclic loads
can cause cracks or failure of the ferrite cores.
For detailed information see chapter “Definitions”, section 8.1.
Effects of core combination on AL value
Stresses in the core affect not only the mechanical but also the magnetic properties. It is apparent
that the initial permeability is dependent on the stress state of the core. The higher the stresses are
in the core, the lower is the value for the initial permeability. Thus the embedding medium should
have the greatest possible elasticity.
For detailed information see chapter “Definitions”, section 8.2.
Heating up
Ferrites can run hot during operation at higher flux densities and higher frequencies.
NiZn-materials
The magnetic properties of NiZn-materials can change irreversible in high magnetic fields.
Processing notes
– The start of the winding process should be soft. Else the flanges may be destroid.
– To strong winding forces may blast the flanges or squeeze the tube that the cores can no more
be mount.
– To long soldering time at high temperature (>300 °C) may effect coplanarity or pin arrangement.
– Not following the processing notes for soldering of the J-leg terminals may cause solderability
problems at the transformer because of pollution with Sn oxyd of the tin bath or burned insulation
of the wire. For detailed information see chapter “Processing notes”, section 8.2.
– The dimensions of the hole arrangement have fixed values and should be understood as
a recommendation for drilling the printed circuit board. For dimensioning the pins, the group
of holes can only be seen under certain conditions, as they fit into the given hole arrangement.
To avoid problems when mounting the transformer, the manufacturing tolerances for positioning
the customers’ drilling process must be considered by increasing the hole diameter.
Cautions and warnings
Ferrites and accessories
Cautions and warnings
14 06/13
Symbol Meaning Unit
A
Ae
AL
AL1
Amin
AN
AR
B
B
B
ˆ
B
ˆ
BDC
BR
BS
C0
CDF
DF
d
Ea
f
fcutoff
fmax
fmin
fr
fCu
g
H
H
ˆ
HDC
Hc
h
h/i
2
I
IDC
I
ˆ
J
k
k3
k3c
L
Cross section of coil
Effective magnetic cross section
Inductance factor; AL = L/N2
Minimum inductance at defined high saturation ( a)
Minimum core cross section
Winding cross section
Resistance factor; AR = RCu/N2
RMS value of magnetic flux density
Flux density deviation
Peak value of magnetic flux density
Peak value of flux density deviation
DC magnetic flux density
Remanent flux density
Saturation magnetization
Winding capacitance
Core distortion factor
Relative disaccommodation coefficient DF = d/i
Disaccommodation coefficient
Activation energy
Frequency
Cut-off frequency
Upper frequency limit
Lower frequency limit
Resonance frequency
Copper filling factor
Air gap
RMS value of magnetic field strength
Peak value of magnetic field strength
DC field strength
Coercive field strength
Hysteresis coefficient of material
Relative hysteresis coefficient
RMS value of current
Direct current
Peak value of current
Polarization
Boltzmann constant
Third harmonic distortion
Circuit third harmonic distortion
Inductance
mm2
mm2
nH
nH
mm2
mm2
 = 10–6
Vs/m2, mT
Vs/m2, mT
Vs/m2, mT
Vs/m2, mT
Vs/m2, mT
Vs/m2, mT
Vs/m2, mT
F = As/V
mm–4.5
J
s–1, Hz
s–1, Hz
s–1, Hz
s–1, Hz
s–1, Hz
mm
A/m
A/m
A/m
A/m
10–6 cm/A
10–6 cm/A
A
A
A
Vs/m2
J/K
H = Vs/A
Symbols and terms
Ferrites and accessories
Symbols and terms
15 06/13
Symbol Meaning Unit
L/L
L0
LH
Lp
Lrev
Ls
le
lN
N
PCu
Ptrans
PV
PF
Q
R
RCu
Rh
Rh
Ri
Rp
Rs
Rth
RV
s
T
T
TC
t
tv
tan
tanL
tanr
tane
tanh
tan/i
U
Û
Ve
Z
Zn
Relative inductance change
Inductance of coil without core
Main inductance
Parallel inductance
Reversible inductance
Series inductance
Effective magnetic path length
Average length of turn
Number of turns
Copper (winding) losses
Transferrable power
Relative core losses
Performance factor
Quality factor (Q = L/Rs = 1/tanL)
Resistance
Copper (winding) resistance (f = 0)
Hysteresis loss resistance of a core
Rh change
Internal resistance
Parallel loss resistance of a core
Series loss resistance of a core
Thermal resistance
Effective loss resistance of a core
Total air gap
Temperature
Temperature difference
Curie temperature
Time
Pulse duty factor
Loss factor
Loss factor of coil
(Residual) loss factor at H 0
Relative loss factor
Hysteresis loss factor
Relative loss factor of material at H 0
RMS value of voltage
Peak value of voltage
Effective magnetic volume
Complex impedance
Normalized impedance |Z|n = |Z| /N 2 (le /Ae)
H
H
H
H
H
H
mm
mm
W
W
mW/g







K/W

mm
°C
K
°C
s
V
V
mm3

/mm
Symbols and terms
Ferrites and accessories
16 06/13
All dimensions are given in mm.
Surface-mount device
Symbol Meaning Unit
F
e
r
B
i
s
0
a
app
e
i
p'
p"
r
rev
s'
s"
tot
l/A
Cu
Temperature coefficient (TK)
Relative temperature coefficient of material
Temperature coefficient of effective permeability
Relative permittivity
Magnetic flux
Efficiency of a transformer
Hysteresis material constant
Hysteresis core constant
Magnetostriction at saturation magnetization
Relative complex permeability
Magnetic field constant
Relative amplitude permeability
Relative apparent permeability
Relative effective permeability
Relative initial permeability
Relative real (inductive) component of (for parallel components)
Relative imaginary (loss) component of (for parallel components)
Relative permeability
Relative reversible permeability
Relative real (inductive) component of (for series components)
Relative imaginary (loss) component of (for series components)
Relative total permeability
derived from the static magnetization curve
Resistivity
Magnetic form factor
DC time constant Cu = L/RCu = AL/AR
Angular frequency; = 2 f
1/K
1/K
1/K
Vs
mT-1
A–1H–1/2
Vs/Am
m–1
mm–1
s
s–1
Symbols and terms
Ferrites and accessories
17 06/13
Important notes
The following applies to all products named in this publication:
1. Some parts of this publication contain statements about the suitability of our products for certain areas
of application. These statements are based on our knowledge of typical requirements that are often placed
on our products in the areas of application concerned. We nevertheless expressly point out that such
statements cannot be regarded as binding statements about the suitability of our products for a
particular customer application. As a rule we are either unfamiliar with individual customer applications or
less familiar with them than the customers themselves. For these reasons, it is always ultimately incumbent
on the customer to check and decide whether a product with the properties described in the product
specification is suitable for use in a particular customer application.
2. We also point out that in individual cases, a malfunction of electronic components or failure before
the end of their usual service life cannot be completely ruled out in the current state of the art, even
if they are operated as specified. In customer applications requiring a very high level of operational safety
and especially in customer applications in which the malfunction or failure of an electronic component could
endanger human life or health (e.g. in accident prevention or life-saving systems), it must therefore be
ensured by means of suitable design of the customer application or other action taken by the customer (e.g.
installation of protective circuitry or redundancy) that no injury or damage is sustained by third parties in the
event of malfunction or failure of an electronic component.
3. The warnings, cautions and product-specific notes must be observed.
4. In order to satisfy certain technical requirements, some of the products described in this publication
may contain substances subject to restrictions in certain jurisdictions (e.g. because they are
classed as hazardous). Useful information on this will be found in our Material Data Sheets on the Internet
(www.tdk-electronics.tdk.com/material). Should you have any more detailed questions, please contact our
sales offices.
5. We constantly strive to improve our products. Consequently, the products described in this publication
may change from time to time. The same is true of the corresponding product specifications. Please
check therefore to what extent product descriptions and specifications contained in this publication are still
applicable before or when you place an order.
We also reserve the right to discontinue production and delivery of products. Consequently, we
cannot guarantee that all products named in this publication will always be available. The aforementioned
does not apply in the case of individual agreements deviating from the foregoing for customer-specific
products.
6. Unless otherwise agreed in individual contracts, all orders are subject to our General Terms and
Conditions of Supply.
7. Our manufacturing sites serving the automotive business apply the IATF 16949 standard. The IATF
certifications confirm our compliance with requirements regarding the quality management system in the
automotive industry. Referring to customer requirements and customer specific requirements (“CSR”) TDK
always has and will continue to have the policy of respecting individual agreements. Even if IATF 16949
may appear to support the acceptance of unilateral requirements, we hereby like to emphasize that only
requirements mutually agreed upon can and will be implemented in our Quality Management
System. For clarification purposes we like to point out that obligations from IATF 16949 shall only become
legally binding if individually agreed upon.
8. The trade names EPCOS, CeraCharge, CeraDiode, CeraLink, CeraPad, CeraPlas, CSMP, CTVS,
DeltaCap, DigiSiMic, ExoCore, FilterCap, FormFit, LeaXield, MiniBlue, MiniCell, MKD, MKK, MotorCap,
PCC, PhaseCap, PhaseCube, PhaseMod, PhiCap, PowerHap, PQSine, PQvar, SIFERRIT, SIFI, SIKOREL,
SilverCap, SIMDAD, SiMic, SIMID, SineFormer, SIOV, ThermoFuse, WindCap are trademarks registered
or pending in Europe and in other countries. Further information will be found on the Internet at www.tdk-
electronics.tdk.com/trademarks.
Release 2018-10