Ferrites and accessories
RM 8, RM 8 LP
Core and accessories
Series/Type:
B65811, B65812
Date:
May 2017
The following products presented in this data sheet are being withdrawn.
Ordering Code
Substitute Product
B65812A5000X000
Date of Withdrawal
2018-06-08
Deadline Last
Orders
2018-09-14
Last Shipments
2018-12-14
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.
EPCOS AG 2017. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS’ prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
RM 8
Core and accessories
Individual parts
Part no.
Page
Adjusting screw
B65812
9
Core
B65811
3
Clamps
B65812
8
Insulating washer 1
B65812
8
Coil former
B65812
5
Core
B65811
3
Insulating washer 2
B65812
8
Coil former for
SMPS transformers
B65812
6
Coil former for
power applications
B65812
7
Core
B65811P
10
Clamp
B65812
11
Insulating washers 1 + 2
B65812
11
Threaded sleeve (glued-in)
Example of an assembly set
Also available:
RM 8 low-profile:
Please read Cautions and warnings and
Important notes at the end of this document.
2
5/17
RM 8
Core
B65811
■ To IEC 62317-4
■ Cores without center hole
for transformer applications
■ Delivery mode: sets
Magnetic characteristics (per set)
Σl/A
le
Ae
Amin
Ve
with
center hole
without
center hole
0.68
35.1
52
—
1825
0.59
38
64
55
2430
mm–1
mm
mm2
mm2
mm3
12
g
Approx. weight (per set)
m
10.7
Gapped (AL values/air gaps examples)
Material
N48
AL value
s
nH
approx.
mm
250 ±
315 ±
400 ±
630 ±
μe
Ordering code 1)
-D with center hole
-F with threaded sleeve
-J without center hole
3%
3%
3%
5%
0.23
0.17
0.14
0.10
134
169
215
338
B65811+0250A048
B65811+0315A048
B65811+0400A048
B65811+0630J048
N41
160 ± 3%
250 ± 5%
630 ± 5%
1600 ±10%
0.49
0.24
0.11
0.04
76
118
298
756
B65811J0160A041
B65811J0250J041
B65811J0630J041
B65811J1600K041
N87
250 ± 3%
400 ± 3%
0.30
0.18
118
189
B65811J0250A087
B65811J0400A087
1) Replace the + by the code letter “F” or “D” for the required version. Standard version is “D”.
Please read Cautions and warnings and
Important notes at the end of this document.
3
5/17
RM 8
Core
B65811
Ungapped
Material
AL value
μe
nH
PV
Ordering code
-D with center hole
-J without center hole
W/set
N48
2900 +30/–20% 1550
B65811D0000R048
N30
5700 +30/–20% 2690
B65811J0000R030
T38
12500 +40/–30% 5910
B65811J0000Y038
N49
2200 +30/–20% 1040
< 0.37 ( 50 mT, 500 kHz, 100 °C)
B65811J0000R049
N87
3300 +30/–20% 1560
< 1.20 (200 mT, 100 kHz, 100 °C)
B65811J0000R087
N97
3300 +30/–20% 1560
< 1.00 (200 mT, 100 kHz, 100 °C)
B65811J0000R097
N41
4100 +30/–20% 1940
< 0.37 (200 mT, 25 kHz, 100 °C)
B65811J0000R041
N95
4100 +30/–20% 1940
< 1.10 (200 mT, 100 kHz, 100 °C)
B65811J0000R095
Other AL values/air gaps and materials available on request ─ see Processing remarks on page 12.
Please read Cautions and warnings and
Important notes at the end of this document.
4
5/17
RM 8
Accessories
B65812
Coil former, squared pins
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 Processing notes, 2.1
For matching clamp and insulating washers see page 8.
Sections
AN
mm2
lN
mm
AR value
μΩ
Pins
Ordering code
1
30
42
47
5
8
12
B65812N1005D001
B65812N1008D001
B65812N1012D001
2
28.4
42
50
5
8
12
B65812N1005D002
B65812N1008D002
B65812N1012D002
Please read Cautions and warnings and
Important notes at the end of this document.
5
5/17
Version
Pins omitted
5 pins
8 pins
3, 4, 6, 7, 9, 10, 12
3, 4, 9, 10
RM 8
Accessories
B65812
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
■ 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 Processing notes, 2.1
Sections
AN
mm2
lN
mm
AR value
μΩ
Pins
Ordering code
2
28.4
42
50
8
B65812N1108D002
Please read Cautions and warnings and
Important notes at the end of this document.
6
5/17
RM 8
Accessories
B65812
Coil former for power applications
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)] SABIC INNOVATIVE 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 Processing notes, 2.1
For matching clamp and insulating washer 1 see page 8.
Sections
AN
mm2
lN
mm
AR value
μΩ
Pins
Ordering code
1
30
42
47
12
B65812C1512T001
Hole arrangement
View in mounting direction
(Note half pitch!)
Please read Cautions and warnings and
Important notes at the end of this document.
7
5/17
RM 8
Accessories
B65812
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
Insulating washer 1 between core and coil former
■ For tolerance compensation and for insulation
■ Made of polyarylate film (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 [E168120 (M)], COVESTRO AG
Ordering code
Clamp (ordering code per piece, 2 are required)
B65812A2203X000
Insulating washer 1 (reel packing, PU = 1 reel)
B65812A5000X000
Insulating washer 2 (bulk)
B65812C2005X000
Clamp
Insulating washer 1
Please read Cautions and warnings and
Important notes at the end of this document.
Insulating washer 2
8
5/17
RM 8
Accessories
B65812
Adjusting screw
■ Tube core with thread and core brake made of GFR polyterephthalate
Pocan B3235 ® [E245249 (M)], LANXESS AG
Tube core
∅ × length (mm)
Material
Color code
Ordering code
3.85 × 5.0
N22
gray
B65812B3003X022
Please read Cautions and warnings and
Important notes at the end of this document.
9
5/17
RM 8 »Low Profile«
Core
■
■
■
■
B65811P
To IEC 62317-4
For compact transformers
Without center hole
Delivery mode: sets
Magnetic characteristics (per set)
Σl/A
le
Ae
Amin
Ve
= 0.44 mm–1
= 28.7 mm
= 64.9 mm2
= 55.4 mm2
= 1860 mm3
Approx. weight 9.2 g/set
Ungapped
Material
AL value
μe
nH
PV
Ordering code
W/set
N49
2900 +30/–20%
1020
< 0.33 ( 50 mT, 500 kHz, 100 °C)
B65811P0000R049
N92
3100 +30/–20%
1090
< 1.10 (200 mT, 100 kHz, 100 °C)
B65811P0000R092
N87
4100 +30/–20%
1440
< 0.92 (200 mT, 100 kHz, 100 °C)
B65811P0000R087
Other AL values/air gaps and materials available on request ─ see Processing remarks on page 12.
Please read Cautions and warnings and
Important notes at the end of this document.
10
5/17
RM 8 »Low Profile«
Accessories
B65812
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
Insulating washer 1 between core and coil former
■ For tolerance compensation and for insulation
■ Made of polyarylate film (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 [E168120 (M)], COVESTRO AG
Ordering code
Clamp (ordering code per piece, 2 are required)
B65812P2203X000
Insulating washer 1 (reel packing, PU = 1 reel)
B65812A5000X000
Insulating washer 2 (bulk)
B65812C2005X000
Clamp
Insulating washer 1
Please read Cautions and warnings and
Important notes at the end of this document.
Insulating washer 2
11
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Ferrites and accessories
Cautions and warnings
Cautions and warnings
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 temperature 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 data book, chapter “General - Definitions, 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 data book, chapter “General - Definitions, 8.1”.
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.
Ferrite Accessories
EPCOS ferrite accessories have been designed and evaluated only in combination with EPCOS
ferrite cores. EPCOS explicitly points out that EPCOS ferrite accessories or EPCOS ferrite cores
may not be compatible with those of other manufacturers. Any such combination requires prior testing by the customer and will be at the customer‘s own risk.
EPCOS assumes no warranty or reliability for the combination of EPCOS ferrite accessories with
cores and other accessories from any other manufacturer.
Processing remarks
The start of the winding process should be soft. Else the flanges may be destroyed.
– Too strong winding forces may blast the flanges or squeeze the tube that the cores can not be
mounted any more.
– Too 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 oxyde of the tin bath or burned insulation of the wire. For detailed information see chapter “Processing notes”, section 2.2.
– 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.
Please read Cautions and warnings and
Important notes at the end of this document.
12
5/17
Ferrites and accessories
Cautions and warnings
Display of ordering codes for EPCOS products
The ordering code for one and the same product can be represented differently in data sheets,
data books, other publications and the website of EPCOS, or in order-related documents such as
shipping notes, order confirmations and product labels. The varying representations of the
ordering codes are due to different processes employed and do not affect the
specifications of the respective products. Detailed information can be found on the Internet
under www.epcos.com/orderingcodes.
Please read Cautions and warnings and
Important notes at the end of this document.
13
5/17
Ferrites and accessories
Symbols and terms
Symbols and terms
Symbol
Meaning
Unit
A
Ae
AL
AL1
Amin
AN
AR
B
ΔB
ˆ
B
ΔBˆ
BDC
BR
BS
C0
CDF
DF
d
Ea
f
fcutoff
fmax
fmin
fr
fCu
g
H
ˆ
H
HDC
Hc
h
h/μi 2
I
IDC
ˆI
J
k
k3
k3c
L
Cross section of coil
Effective magnetic cross section
Inductance factor; AL = L/N2
Minimum inductance at defined high saturation ( μa)
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/μi
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
μΩ = 10–6 Ω
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
Please read Cautions and warnings and
Important notes at the end of this document.
14
5/17
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
Ferrites and accessories
Symbols and terms
Symbol
Meaning
Unit
ΔL/L
L0
LH
Lp
Lrev
Ls
le
lN
N
PCu
Ptrans
PV
PF
Q
R
RCu
Rh
ΔRh
Ri
Rp
Rs
Rth
RV
s
T
ΔT
TC
t
tv
tan δ
tan δL
tan δr
tan δe
tan δh
tan δ/μi
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 = ωL/Rs = 1/tan δL)
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 × ε (le /Ae)
H
H
H
H
H
H
mm
mm
Please read Cautions and warnings and
Important notes at the end of this document.
15
5/17
W
W
mW/g
Ω
Ω
Ω
Ω
Ω
Ω
Ω
K/W
Ω
mm
°C
K
°C
s
V
V
mm3
Ω
Ω/mm
Ferrites and accessories
Symbols and terms
Symbol
Meaning
Unit
α
αF
αe
εr
Φ
η
ηB
ηi
λs
μ
μ0
μa
μapp
μe
μi
μ p'
μ p"
μr
μrev
μs'
μs"
μtot
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 μ (for parallel components)
Relative imaginary (loss) component of μ (for parallel components)
Relative permeability
Relative reversible permeability
Relative real (inductive) component of μ (for series components)
Relative imaginary (loss) component of μ (for series components)
Relative total permeability
derived from the static magnetization curve
Resistivity
Magnetic form factor
DC time constant τCu = L/RCu = AL/AR
Angular frequency; ω = 2 Πf
1/K
1/K
1/K
ρ
Σl/A
τCu
ω
All dimensions are given in mm.
Surface-mount device
Please read Cautions and warnings and
Important notes at the end of this document.
16
5/17
Vs
mT-1
A–1H–1/2
Vs/Am
Ωm–1
mm–1
s
s–1
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.tdkelectronics.tdk.com/trademarks.
Release 2018-10
Please read Cautions and warnings and
Important notes at the end of this document.
17
5/17
