EPCOS AG 2018. 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.
Ferrites and accessories
E 65/32/27
Core and accessories
Series/Type: B66387, B66388
Date: April 2018
24/18
Please read Cautions and warnings and
Important notes at the end of this document.
■Delivery mode: single units
Magnetic characteristics (per set)
l/A = 0.27 mm–1
le= 147 mm
Ae= 535 mm2
Amin = 529 mm2
Ve= 78650 mm3
Approx. weight 394 g/set
Ungapped
* H = 250 A/m; f = 10 kHz; T = 100 °C
Gapped (AL values/air gaps examples)
The AL value in the table applies to a core set comprising one ungapped core (dimension g = 0 mm)
and one gapped core (dimension g > 0 mm).
Other AL values/air gaps and materials available on request – see Processing remarks on page 4.
Mate-
rial
AL value
nH
eBS*
mT
PV
W/set
Ordering code
N92 5800 +30/–20% 1250 340 < 7.5 (100 mT, 100 kHz, 100 °C) B66387G0000X192
N27 7200 +30/–20% 1570 320 < 14.6 (200 mT, 25 kHz, 100 °C) B66387G0000X127
N87 7900 +30/–20% 1700 320 < 6.7 (100 mT, 100 kHz, 100 °C) B66387G0000X187
N97 7900 +30/–20% 1730 330 < 6.3 (100 mT, 100 kHz, 100 °C) B66387G0000X197
N95 11000+30/-20% 2410 330 < 8.3 (100 mT, 100 kHz, 25 °C)
< 6.5 (100 mT, 100 kHz, 100 °C)
B66387G0000X195
Material g
mm
AL value
approx.
nH
eOrdering code
** = 27 (N27)
** = 87 (N87)
N27, 0.500.05 1214 265 B66387G0500X1**
N87 1.000.05 716 156 B66387G1000X1**
1.500.05
2.500.05
4.000.05
526
360
230
115
80
50
B66387G1500X1**
B66387G2500X1**
B66387G4000X1**
B66387Core
E 65/32/27
34/18
Please read Cautions and warnings and
Important notes at the end of this document.
Calculation factors (for formulas, see “E cores: general information”)
Validity range: K1, K2: 0.20 mm < s < 5.00 mm
K3, K4: 230 nH < AL < 2290 nH
Coil former
Material: Polyphenylene suplhide (UL 94 V-0, insulation class to IEC 60085:
F max. operating temperature 155 °C), color code natur
Ryton R-4-230, E95746 (M), SOLVAY SPECIALITY POLYMERS
Winding: see Processing notes, 2.1
Material Relationship between
air gap – AL value
Calculation of saturation current
K1 (25 °C) K2 (25 °C) K3 (25 °C) K4 (25 °C) K3 (100 °C) K4 (100 °C)
N27 716 –0.762 1231 –0.847 1154 –0.865
N87 716 –0.762 1168 –0.796 1131 –0.873
Sections AN
mm2
lN
mm
AR value
Pins Ordering code
1 435 246 19.5 – B66388A2000T001
B66387, B66388Core and accessories
E 65/32/27
44/18
Please read Cautions and warnings and
Important notes at the end of this document.
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 tempera-
ture 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 te-
sting 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 arrange-
ment.
– 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 insula-
tion 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.
Cautions and warnings
Ferrites and accessories
Cautions and warnings
54/18
Please read Cautions and warnings and
Important notes at the end of this document.
Ferrites and accessories
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.
Cautions and warnings
64/18
Please read Cautions and warnings and
Important notes at the end of this document.
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/i2
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
74/18
Please read Cautions and warnings and
Important notes at the end of this document.
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
tanL
tanr
tane
tanh
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/tanL)
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| /N2 (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
84/18
Please read Cautions and warnings and
Important notes at the end of this document.
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
94/18
Please read Cautions and warnings and
Important notes at the end of this document.
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
