Series CRF Power Wirewound Resistors flame retardant, safety version Specifications Type CRF251-4 CRF252-4 CRF253-4 CRF254-4 CRF256-4 CRF257-4 Nominal Power rating P W 1,1 2,0 2,5 3,0 4,0 5,0 40 P 1,0 1,6 2,0 2,5 3,5 4,3 70 Resistance range see next page ( higher values upon request ) E-Series E 24 Tolerances % 5 -6 -1 +50 Temperature coefficient 10 * K 120 max. cont. work. voltage V P R RMS 70 Insulation voltage (1min.) V max 75V RM S Insulation resistance not insulated o Derating linear C 70 ... 350 (0W) Climatic category 55/350/56 o Temperature range C - 55 ... 350 -1 Thermal resistance KW 125 100 85 65 65 48 Failure rate -9 -1 (Total, J , max., 60% conf. lev.) 10 * h appr. 10, depends on value o Endurance DR o (P , 70 C, 1000) % 5,0 average R 70 Damp heat, steady state DR o (40 C, 93% r.h., 56d) % 5,0R DR Climatic sequence %R 2,0 DR Terminal strength % 0,2 R Terminal tensile strength N 40 50 Resistance to soldering heat DR o (260 C, 10s) % 0,5 R Solderability s 2,5 Flowtime, solderglobule test, IEC 60068-2-20 Marking printed in clear Revision 200907 VITROHM PORTUGUESA, Lda. - Est.Nacional 249-4, Trajouce - 2765-653 S. Domingos de Rana - PORTUGAL Tel: + 351 214 457 700 -Fax: + 351 214 457 755 -Germany Sales Tel: + 0049 4121 870 103 - e-mail:vitrohm.support yageo.com - www.vitrohm.comSeries CRF Series RWP Series CRF VITROHM Type Resistance range min. max. CRF251-4 *1R0 100R CRF252-4 *1R0 240R CRF253-4 *1R0 330R CRF254-4 *1R0 330R CRF256-4 *1R0 330R CRF257-4 *1R0 330R Note: The special construction of resistance values >10R results in an immediate interruption (<1s, 200ms typical ) when mains voltage (220V/240V ) is applied. No flames, no explosion. After fusing, the resistance value RMS is >100KOhm. For other voltages test suitability in the application * Resistance values < 10R are flame retardant. The interruption mechanism is not clearly defined and has to be tested in the final application Type L D d max. max. CRF251-4 9,0 3,0 0,65 CRF252-4 9,7 4,0 0,80 CRF253-4 14,5 4,5 0,65 CRF254-4 12,6 6,0 0,80 CRF256-4 17,0 6,0 0,80 CRF257-4 18,0 8,5 0,80 *R <10R Dmax. +1 Dimensions in mm: L max. 2 Coating residues 2 6 6 C1 Packaging: Type Packaging Pieces Code C S CRF251-4 taped/Ammopack 1000 T 65 5 CRF252-4 taped/Ammopack 1000 T 65 5 CRF253-4 taped/Ammopack 1000 T 85 10 CRF254-4 taped/Ammopack 1000 T 85 10 CRF256-4 taped/Ammopack 1000 T 85 10 CRF257-4 taped/Ammopack 500 T 85 10 Ordering example: CRF254-4 5 T 15R Type Tolerance Pack.-Code R-Value Revision 200907 VITROHM PORTUGUESA, Lda. - Est.Nacional 249-4, Trajouce - 2765-653 S. Domingos de Rana - PORTUGAL Tel: + 351 214 457 700 -Fax: + 351 214 457 755 -Germany Sales Tel: + 0049 4121 870 103 - e-mail:vitrohm.support yageo.com - www.vitrohm.com d