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 Clamps B65888 6 Coil former B65888 4 Core B65887 3 Insulating washer B65888 6 Coil former for power applications B65888 5 B65887P 7 Example of an assembly set Also available: RM 14 low-profile: Core Please read Cautions and warnings and Important notes at the end of this document.
RM 14 Core B65887 ■ 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) Σl/A le Ae Amin Ve = 0.35 mm–1 = 70 mm = 200 mm2 = 170 mm2 = 14000 mm3 Approx. weight 74 g/set Gapped (AL values/air gaps examples) Material N41 μe nH s approx. mm 160 ±3% 250 ±3% 400 ±3% 1000 ±5% 1.90 1.00 0.50 0.
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.
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.
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.
RM 14 »Low Profile« Core ■ ■ ■ ■ B65887P To IEC 62317-4 For compact transformers Without center hole Delivery mode: sets Magnetic characteristics (per set) Σl/A le Ae Amin Ve = 0.25 mm–1 = 50.9 mm = 201 mm2 = 170 mm2 = 10230 mm3 Approx. weight 55 g/set Ungapped Material AL value μe nH PV Ordering code W/set 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.
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.
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.
Ferrites and accessories Symbols and terms Symbols and terms Symbol Meaning Unit A Ae AL AL1 Amin AN AR B ΔB B̂ ΔB̂ BDC BR BS C0 CDF DF d Ea f fcutoff fmax fmin fr fCu g H Ĥ HDC Hc h h/μi 2 I IDC Î 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 magnet
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
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 permeabili
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.
