Ferrites and Accessories
PQ26/20 – Cores and coil former
Series/Type: B65877B, B65878E
Ordering code:
Date: August 2009
Version: 2
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Identification/Classification 1
(header 1 + top left bar):
Ferrites and Accessories
Identification/Classification 2
(header 2 + bottom left header bar):
PQ26/20 – Cores and coil former
Ordering code: (top right header bar)
Series/Type: (top right header bar) B65877B, B65878E
Preliminary data (optional):
(if necessary)
Department: KA IN FER D PD, SMP IN FER D PD
Date: August 2009
Version: 2
Ferrites and Accessories
PQ26/20 – Cores and coil former B65877B, B65878E
KA IN FER D PD, SMP IN FER D PD August 2009
Please read Cautions and warnings and Page 2 of 5
Important notes at the end of this document.
Cores B65877B series
To IEC 62317-13
Delivery mode: sets
Magnetic characteristics (per set)
l/A = 0.363 mm-1
le = 44.40 mm
Ae = 122.3 mm2
Amin = 108.8 mm2
Ve = 5435 mm3
Approx. weight : 31 g/set
Dimensions in mm
Ungapped
Material AL value1)
nH
µe P
V
W/Set
Ordering code
N87 5000 +30/–20% 1440 < 3.20 (100 kHz, 200 mT, 100 °C) B65877B0000R087
N97 5150 +30/–20% 1480 < 2.70 (100 kHz, 200 mT, 100 °C) B65877B0000R097
N95 6300 +30/–20% 1820 < 3.00 (100 kHz, 200 mT, 25 °C-100 °C)
< 3.60 (100 kHz, 200 mT, 120 °C)
B65877B0000R095
N49 3850 +30/–20% 1110 < 1.90 (500 kHz, 50 mT, 100 °C) B65877B0000R049
N92 3850 +30/–20% 1110 < 3.70 (100 kHz, 200 mT, 100 °C) B65877B0000R092
1) Measurement parameter: 10 kHz, 0.25 mT, 100 turns, room temperature.
AL value is measured acc. to IEC62044-2. An appropriate wringing of cores with polished surface is used to improve
reproducibility of the measurement. (It is recommended to rub the mating surfaces themselves six times in a circular or
elliptic arc that matches the core profile before measuring AL value).
Ferrites and Accessories B65878E0012D001
PQ26/20 – Cores and coil former B65877B, B65878E
KA IN FER D PD, SMP IN FER D PD August 2009
Please read Cautions and warnings and Page 3 of 5
Important notes at the end of this document.
Coil former
Material: GFR thermosetting plastic (UL 94 V-0, insulation class to IEC 60085:
H=max.operating temperature 180 °C), color code black
Sumikon PM9820 [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 68-2-20, test Tb, method 1B: 350 °C, 3.5 s
Sections AN
mm²
lN
mm
AR value
µΩ
Terminals Ordering code
1 33 56 58 12
B65878E0012D001
Ferrites and Accessories B65878E0012D001
PQ26/20 – Cores and coil former B65877B, B65878E
KA IN FER D PD, SMP IN FER D PD August 2009
Please read Cautions and warnings and Page 4 of 5
Important notes at the end of this document.
Cautions and warnings
Mechanical stress and mounting
Ferrite cores have to meet mechanical requirements during assembly and for a growing number of
applications. Since ferrites are ceramic materials one has to be aware of their special behavior under
mechanical load.
Just like any ceramic material, ferrite cores are brittle and sensitive to any shock, fast changing or
tensile load. Especially fast cooling rates under ultrasonic cleaning, high static and cyclic loads can
cause cracks or failure of the ferrite cores.
For detailed information see Data Book 2007, 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 the value for the initial permeability. Thus, the embedding medium should offer the
greatest possible elasticity.
For detailed information see Data Book 2007, chapter “General – Definitions, 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 irreversibly when exposed to strong magnetic
fields.
Processing notes
– The start of the winding process should be soft. Otherwise, the flanges may be destroyed.
– Excessive winding forces may damage the flanges or squeeze the tube so that the cores can no
longer be mounted.
– Excessive soldering time at high temperature (>300 °C) may affect 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 contamination with tin oxide (SnO) from the tin bath or
burned insulation from the wire. For detailed information see Data Book 2007, chapter “Processing
notes, 2.2”.
– The dimensions of the pin hole arrangement are fixed and should be understood as an ideal
recommendation for drilling the printed circuit board. In order to avoid problems when
mounting the transformer, customers should make allowances for manufacturing tolerances in
the drilling and pick-and-place processes by increasing the diameter of the pin holes.
Important notes
Page 5 of 5
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, EPCOS is 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 an EPCOS 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.epcos.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 the current version of
the “General Terms of Delivery for Products and Services in the Electrical Industry”
published by the German Electrical and Electronics Industry Association (ZVEI).
7. The trade names EPCOS, BAOKE, Alu-X, CeraDiode, CSMP, CSSP, CTVS, DeltaCap, DigiSiMic,
DSSP, FormFit, MiniBlue, MiniCell, MKD, MKK, MLSC, MotorCap, PCC, PhaseCap, PhaseCube,
PhaseMod, PhiCap, SIFERRIT, SIFI, SIKOREL, SilverCap, SIMDAD, SiMic, SIMID, SineFormer,
SIOV, SIP5D, SIP5K, ThermoFuse, WindCap are trademarks registered or pending in Europe
and in other countries. Further information will be found on the Internet at
www.epcos.com/trademarks.
