Datasheet

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:[e-mail] - www.vitrohm.com
Series CRF
Power Wirewound Resistors
flame retardant, safety version
Specifications
Nominal Power rating P
40
W 1,1 2,0 2,5 3,0 4,0 5,0
P
70
1,0 1,6 2,0 2,5 3,5 4,3
Resistance range see next page
( higher values upon request )
E-Series E 24
Tolerances % ± 5
Temperature coefficient 10
-6
* K
-1
120
+50
max. cont. work. voltage V
RMS
P
70
· R
Insulation voltage (1min.)
V
RM S
max 75V
Insulation resistance not insulated
Derating linear
o
C 70 ... 350 (0W)
Climatic category 55/350/56
Temperature range
o
C - 55 ... 350
Thermal resistance KW
-1
125 100 85 65 65 48
Failure rate
(Total, J
o
, max., 60% conf. lev.) 10
-9
* h
-1
appr. 10, depends on value
Endurance
(P
70
, 70
o
C, 1000) % ± 5,0 average
Damp heat, steady state
(40
o
C, 93% r.h., 56d) % ± 5,0
Climatic sequence % ± 2,0
Terminal strength % ± 0,2
Terminal tensile strength N 40 50
Resistance to soldering heat
(260
o
C, 10s) % ± 0,5
Solderability s 2,5 Flowtime, solderglobule test, IEC 60068-2-20
Marking printed in clear
CRF251-4 CRF252-4 CRF253-4 CRF254-4 CRF256-4 CRF257-4
Type
[
DR
]
R
[
DR
]
R
[
DR
]
R
[
DR
]
R
[
DR
]
R
Ω
Ω