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