B65887E0400A087

## **Ferrites and accessories** 

## RM 14, RM 14 LP Cores and accessories 

**Series/Type: B65887, B65888** Date: May 2017 

 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 14 Core and accessories** 

|||||||||||||Individual parts|Part no.|Page|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|||||||||||||Core|B65887|3|
||||an|wtih|||||||||||
||Clamps<br>~~|}~~<br>~~|=O~~||||||||||||B65888|6|
||||||||||||||||
||'|||CA|||||||||||
|||||||||||||Coil former|B65888|4|
|||||||||||||Core|B65887|3|
|||||||||||||||||
|||||||||||||||||
|||||||~~——~~||||||Insulating washer|B65888|6|
||||||||||||FRM0129-K|||||
|Example of an assembly set||||||||||Example of an assembly set|||||
|**Also available:**||||||||||||Coil former for|||
|||||||||||||power applications|B65888|5|
|||||||||||||RM 14 low-profile:|||
|||||||||||||Core|B65887P|7|



Please read _Cautions and warnings_ and _Important notes_ at the end of this document. 

**2** 5/17 

**B65887** 

## **RM 14** 

## **Core** 

- To IEC 62317-4 

- Optimized core cross section and increased thickness of base for power applications 

- Without center hole 

- Delivery mode: sets 

## **Magnetic characteristics** (per set) 

- Σ l _/_ A = 0.35 mm[–1] 

- le = 70 mm 

Ae = 200 mm[2] 

- Amin = 170 mm[2] 

- Ve = 14000 mm[3] 

## **Approx. weight** 74 g/set 

**==> picture [221 x 305] intentionally omitted <==**

**Gapped** (AL values/air gaps examples) 

|Material|ALvalue<br>nH|s<br>approx.<br>mm|μe|Ordering code<br>-E without center hole|
|---|---|---|---|---|
|N41|160±3%<br>250±3%<br>400±3%<br>1000±5%|1.90<br>1.00<br>0.50<br>0.15|45<br>70<br>111<br>279|B65887E0160A041<br>B65887E0250A041<br>B65887E0400A041<br>B65887E1000J041|



## **Ungapped** 

|Material|ALvalue<br>nH|μe|PV<br>W/set|Ordering code<br>-E without center<br>hole|
|---|---|---|---|---|
|N49|3900 +30/–20%|1090|< 2.37 ( 50 mT, 500 kHz, 100°C)|B65887E0000R049|
|N87|6000 +30/–20%|1670|< 7.40 (200 mT, 100 kHz, 100°C)|B65887E0000R087|
|N97|6000 +30/–20%|1670|< 5.60(200 mT, 100 kHz, 100°C)|B65887E0000R097|
|N41|6800 +30/–20%|1890|< 2.52 (200 mT, 25 kHz, 100°C)|B65887E0000R041|



Other AL values/air gaps and materials available on request ─ see Processing remarks on page 8. 

Please read _Cautions and warnings_ and _Important notes_ at the end of this document. 

**3** 5/17 

**RM 14 Accessories B65888** 

## **Coil former** 

Material: GFR thermosetting plastic (UL 94 V-0, insulation class to IEC 60085: F  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 Processing notes, 2.1 

Pins: Squared pins 

For matching clamp and insulating washer see page 6. 

|Sections|AN<br>mm2|lN<br>mm|ARvalue<br>μΩ|Pins|Ordering code|
|---|---|---|---|---|---|
|1|107|71.5|23|10<br>12|B65888N1010D001<br>B65888N1012D001|
|10 pins<br>12 pins||||||



**==> picture [444 x 370] intentionally omitted <==**

Hole arrangement View in mounting direction 

Please read _Cautions and warnings_ and _Important notes_ at the end of this document. 

**4** 5/17 

**RM 14 Accessories B65888** 

## **Coil former for power applications** 

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 see page 6. 

|Sections<br>AN<br>mm2|lN<br>mm|ARvalue<br>μΩ|Pins|Ordering code|
|---|---|---|---|---|
|1<br>106|71.5|23|12|B65888C1512T001|



Marking of pin 1 

~~G~~ round Ø 1. ~~6~~ +0.1 

Hole arrangement View in mounting direction (Note half pitch!) 

Please read _Cautions and warnings_ and _Important notes_ at the end of this document. 

**5** 5/17 

|**RM 14**||
|---|---|
|**Accessories**|**B65888**|



## **Clamp** 

■ With ground terminal, made of spring steel (tinned), 0.5 mm thick 

■ Solderability to IEC 60068-2-20, test Ta, method 1 (aging 3): 235 ° C, 2 s 

## **Insulating washer** for double-clad PCBs 

■ Made of polyarylate film (UL 94 V-0, insulation class to IEC 60085: E  120 ° C), 0.25 mm thick Makrofol FR7-2 [E168120 (M)], COVESTRO AG 

|**Insulating washer**for double-clad PCBs<br>■Made of polyarylate film (UL 94 V-0, insulation class to IEC 60085: E<br>Makrofol FR7-2 [E168120 (M)], COVESTRO AG|120°C), 0.25 mm thick|
|---|---|
||Ordering code|
|Clamp (ordering code per piece, 2 are required)|B65888A2002X000|
|Insulatingwasher(bulk)|B65888B2005X000|



## **Clamp** 

**==> picture [164 x 173] intentionally omitted <==**

## **Insulating washer** 

**==> picture [181 x 184] intentionally omitted <==**

Please read _Cautions and warnings_ and _Important notes_ at the end of this document. 

**6** 5/17 

## **RM 14 »Low Profile« Core** 

**B65887P** 

■ To IEC 62317-4 

■ For compact transformers 

■ Without center hole 

- Delivery mode: sets 

## **Magnetic characteristics** (per set) 

Σ l _/_ A = 0.25 mm[–1] 

le = 50.9 mm Ae = 201 mm[2] Amin = 170 mm[2] 

Ve = 10230 mm[3] 

## **Approx. weight** 55 g/set 

**==> picture [220 x 290] intentionally omitted <==**

## **Ungapped** 

|Material|ALvalue<br>nH|μe|PV<br>W/set|Ordering code|
|---|---|---|---|---|
|N49|5100 +30/–20%|1030|< 2.0 ( 50 mT, 500 kHz, 100°C)|B65887P0000R049|
|N92|5400 +30/–20%|1090|< 6.1 (200 mT, 100 kHz, 100°C)|B65887P0000R092|
|N87|7100 +30/–20%|1430|< 5.5 (200 mT, 100 kHz, 100°C)|B65887P0000R087|



Other AL values/air gaps and materials available on request ─ see Processing remarks on page 8. 

Please read _Cautions and warnings_ and _Important notes_ at the end of this document. 

**7** 5/17 

**Ferrites and accessories** 

## **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. 

5/17 

**8** 

**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. 

**9** 5/17 

## **Ferrites and accessories** 

## **Symbols and terms** 

|Symbol|Meaning|Unit|
|---|---|---|
|A<br>Ae<br>AL<br>AL1<br>Amin<br>AN<br>AR<br>B<br>ΔB<br>Bˆ<br>ΔBˆ<br>BDC<br>BR<br>BS<br>C0<br>CDF<br>DF<br>d<br>Ea<br>f<br>fcutoff<br>fmax<br>fmin<br>fr<br>fCu<br>g<br>H<br>Hˆ<br>HDC<br>Hc<br>h<br>h/μi2<br>I<br>IDC<br>Iˆ<br>J<br>k<br>k3<br>k3c<br>L|Cross section of coil<br>Effective magnetic cross section<br>Inductance factor; AL= L/N2<br>Minimum inductance at defined high saturation (  μa)<br>Minimum core cross section<br>Winding cross section<br>Resistance factor; AR= RCu/N2<br>RMS value of magnetic flux density<br>Flux density deviation<br>Peak value of magnetic flux density<br>Peak value of flux density deviation<br>DC magnetic flux density<br>Remanent flux density<br>Saturation magnetization<br>Winding capacitance<br>Core distortion factor<br>Relative disaccommodation coefficient DF = d/μi<br>Disaccommodation coefficient<br>Activation energy<br>Frequency<br>Cut-off  frequency<br>Upper frequency limit<br>Lower frequency limit<br>Resonance frequency<br>Copper filling factor<br>Air gap<br>RMS value of magnetic field strength<br>Peak value of magnetic field strength<br>DC field strength<br>Coercive field strength<br>Hysteresis coefficient of material<br>Relative hysteresis coefficient<br>RMS value of current<br>Direct current<br>Peak value of current<br>Polarization<br>Boltzmann constant<br>Third harmonic distortion<br>Circuit third harmonic distortion<br>Inductance|mm2<br>mm2<br>nH<br>nH<br>mm2<br>mm2<br>μΩ= 10–6Ω<br>Vs/m2, mT<br>Vs/m2, mT<br>Vs/m2, mT<br>Vs/m2, mT<br>Vs/m2, mT<br>Vs/m2, mT<br>Vs/m2, mT<br>F = As/V<br>mm–4.5<br>J<br>s–1, Hz<br>s–1, Hz<br>s–1, Hz<br>s–1, Hz<br>s–1, Hz<br>mm<br>A/m<br>A/m<br>A/m<br>A/m<br>10–6cm/A<br>10–6cm/A<br>A<br>A<br>A<br>Vs/m2<br>J/K<br>H = Vs/A|



Please read _Cautions and warnings_ and _Important notes_ at the end of this document. 

**10** 5/17 

## **Ferrites and accessories** 

## **Symbols and terms** 

|Symbol|Meaning|Unit|
|---|---|---|
|ΔL/L<br>L0<br>LH<br>Lp<br>Lrev<br>Ls<br>le<br>lN<br>N<br>PCu<br>Ptrans<br>PV<br>PF<br>Q<br>R<br>RCu<br>Rh<br>ΔRh<br>Ri<br>Rp<br>Rs<br>Rth<br>RV<br>s<br>T<br>ΔT<br>TC<br>t<br>tv<br>tanδ<br>tanδL<br>tanδr<br>tanδe<br>tanδh<br>tanδ/μi<br>U<br>Û<br>Ve<br>Z<br>Zn|Relative inductance change<br>Inductance of coil without core<br>Main inductance<br>Parallel inductance<br>Reversible inductance<br>Series inductance<br>Effective magnetic path length<br>Average length of turn<br>Number of turns<br>Copper (winding) losses<br>Transferrable power<br>Relative core losses<br>Performance factor<br>Quality factor (Q =ωL/Rs= 1/tanδL)<br>Resistance<br>Copper (winding) resistance (f = 0)<br>Hysteresis loss resistance of a core<br>Rhchange<br>Internal resistance<br>Parallel loss resistance of a core<br>Series loss resistance of a core<br>Thermal resistance<br>Effective loss resistance of a core<br>Total air gap<br>Temperature<br>Temperature difference<br>Curie temperature<br>Time<br>Pulse duty factor<br>Loss factor<br>Loss factor of coil<br>(Residual) loss factor at H→0<br>Relative loss factor<br>Hysteresis loss factor<br>Relative loss factor of material at H→0<br>RMS value of voltage<br>Peak value of voltage<br>Effective magnetic volume<br>Complex impedance<br>Normalized impedance |Z|n= |Z| /N2 × ε(le/Ae)|H<br>H<br>H<br>H<br>H<br>H<br>mm<br>mm<br>W<br>W<br>mW/g<br>Ω<br>Ω<br>Ω<br>Ω<br>Ω<br>Ω<br>Ω<br>K/W<br>Ω<br>mm<br>°C<br>K<br>°C<br>s<br>V<br>V<br>mm3<br>Ω<br>Ω/mm|



Please read _Cautions and warnings_ and _Important notes_ at the end of this document. 

**11** 5/17 

## **Ferrites and accessories** ~~[~~ 

## **Symbols and terms** 

|Symbol|Meaning|Unit|
|---|---|---|
|α<br>αF<br>αe<br>εr<br>Φ<br>η<br>ηB<br>ηi<br>λs<br>μ<br>μ0<br>μa<br>μapp<br>μe<br>μi<br>μp'<br>μp"<br>μr<br>μrev<br>μs'<br>μs"<br>μtot<br>ρ<br>Σl/A<br>τCu<br>ω|Temperature coefficient (TK)<br>Relative temperature coefficient of material<br>Temperature coefficient of effective permeability<br>Relative permittivity<br>Magnetic flux<br>Efficiency of a transformer<br>Hysteresis material constant<br>Hysteresis core constant<br>Magnetostriction at saturation magnetization<br>Relative complex permeability<br>Magnetic field constant<br>Relative amplitude permeability<br>Relative apparent permeability<br>Relative effective permeability<br>Relative initial permeability<br>Relative real (inductive) component ofμ<br>(for parallel components)<br>Relative imaginary (loss) component ofμ<br>(for parallel components)<br>Relative permeability<br>Relative reversible permeability<br>Relative real (inductive) component ofμ<br>(for series components)<br>Relative imaginary (loss) component ofμ<br>(for series components)<br>Relative total permeability<br>derived from the static magnetization curve<br>Resistivity<br>Magnetic form factor<br>DC time constantτCu= L/RCu= AL/AR<br>Angular frequency;ω= 2Πf|1/K<br>1/K<br>1/K<br>Vs<br>mT-1<br>A–1H–1/2<br>Vs/Am<br>Ωm–1<br>mm–1<br>s<br>s–1|



All dimensions are given in mm. 

Surface-mount device 

Please read _Cautions and warnings_ and _Important notes_ at the end of this document. 

**12** 5/17 

## **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, 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, 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.epcos.com/trademarks. 

Please read _Cautions and warnings_ and _Important notes_ at the end of this document. 

**13** 5/17