Series CRF Power Wirewound resistors flame retardant, safety version Specification Type CRF253-4 CRF254-4 CRF256-4 CRF257-4 Power rating P W 2,5 3,0 4,0 5,0 40 P 2,0 2,5 3,5 4,3 70 Resistance range see Page 2 E-series E 24 Tolerance % 5 -6 -1 50 Temperature coefficient 10 * K 120 max. cont. working voltage V RMS P70 R Insulation voltage (1min.) V max. 75V RMS Insulation resistance not insulated Derating linear C 70 ... 350 (0W) Climatic category 55/200/56 Temperature range C - 55 ... 350 -1 Thermal resistance KW 140 112 80 65 -9 -1 Failure rate appr. 10, depends on value 10 * h (Total, max., 60% conf. lev.) 0 R Endurance % 5,0 average R (P , 70C, 1000h) 70 R Damp heat, steady state % 5,0 R (40C, 93% r. h., 56d) R Climatic sequence % 2,0 R (IEC 115-1/23) R Resistance to soldering heat % 0,5 R (260C, 10s, 3mm) Solderability s 2,5 Flowtime, solderglobule test, IEC 60068-2-20 R Terminal strength % 0,2 R Terminal tensile strength N 50 Marking printed in clear Yageo Europe GmbH Ramskamp 70 D-25337 Elmshorn Germany Ph.: +49 4121 870-103 F.: +49 4121 870-298 File: CRF E121 (08) 20.05.04 Page 1 of 3Series CRF Power Wirewound resistors flame retardant, safety version Type Resistance range min. max. CRF253-4 * 1R0 330R CRF254-4 * 1R0 330R CRF256-4 * 1R0 330R CRF257-4 * 1R0 330R Note: The special construction of resistance values > 10Rresults in an immediate interruption when mains voltage (220V/240V ) is applied. No flames, no explosion. After fusing the resistance value is > 100K. RMS 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 Dimensions in mm: Type L D d max. max. CRF253-4 14,5 4,0 0,65 CRF254-4 12,6 6,0 0,80 CRF256-4 17,0 6,0 0,80 CRF257-4 19,0 8,5 0,80 Yageo Europe GmbH Ramskamp 70 D-25337 Elmshorn Germany Ph.: +49 4121 870-103 F.: +49 4121 870-298 File: CRF E121 (08) 20.05.04 Page 2 of 3