Series CRF
Power Wirewound Resistors
flame retardant, safety version
Specifications
Type
Nominal Power rating P
40
P
70
Resistance range
W
CRF251-4
1,1
1,0
CRF252-4 CRF253-4 CRF254-4 CRF256-4 CRF257-4
2,0
2,5
3,0
4,0
5,0
1,6
2,0
2,5
3,5
4,3
see next page
( higher values upon request )
E 24
Ω
E-Series
Tolerances
Temperature coefficient
max. cont. work. voltage
Insulation voltage (1min.)
Insulation resistance
Derating linear
Climatic category
Temperature range
Thermal resistance
o
%
10
-6
* K
-1
V
RMS
V
RM S
±5
120
+50
P
70
· R
max 75V
not insulated
C
70 ... 350 (0W)
55/350/56
- 55 ... 350
125
100
85
65
65
48
Ω
o
C
KW
-1
Failure rate
(Total,
J
o
, max., 60% conf. lev.) 10
-9
* h
-1
Endurance
(P
70
, 70
o
C, 1000)
Damp heat, steady state
(40
o
C, 93% r.h., 56d)
Climatic sequence
Terminal strength
Terminal tensile strength
Resistance to soldering heat
(260
o
C, 10s)
Solderability
Marking
appr. 10, depends on value
[
DR
]
%
R
[
DR
]
%
R
[
DR
]
%
R
[
DR
]
%
R
N
40
± 5,0 average
± 5,0
± 2,0
± 0,2
50
[
DR
]
%
R
s
± 0,5
2,5 Flowtime, solderglobule test, IEC 60068-2-20
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.com
Series CRF
Series RWP
Type
Resistance range
min.
CRF251-4
CRF252-4
CRF253-4
CRF254-4
CRF256-4
CRF257-4
*1R0
*1R0
*1R0
*1R0
*1R0
*1R0
max.
100R
240R
330R
330R
330R
330R
Series CRF
VITROHM
Note: The special construction of resistance values >10R results in an immediate interruption (<1s, 200ms typical )
when mains voltage (220V/240V
RMS
) is applied. No flames, no explosion. After fusing, the resistance value
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
max.
Ø
D
max.
3,0
4,0
4,5
6,0
6,0
8,5
Ø
d
0,65
0,80
0,65
0,80
0,80
0,80
CRF251-4
CRF252-4
CRF253-4
CRF254-4
CRF256-4
CRF257-4
*R <10R
Dimensions in mm:
Dmax. +1
9,0
9,7
14,5
12,6
17,0
18,0
L
max.
∅
∅
d
2
Coating residues
2
6
C
±1
6
Packaging:
Type
CRF251-4
CRF252-4
CRF253-4
CRF254-4
CRF256-4
CRF257-4
Packaging
taped/Ammopack
taped/Ammopack
taped/Ammopack
taped/Ammopack
taped/Ammopack
taped/Ammopack
Pieces
1000
1000
1000
1000
1000
500
Code
T
T
T
T
T
T
C
65
65
85
85
85
85
S
5
5
10
10
10
10
Ordering example:
CRF254-4
Type
5
Tolerance
T
Pack.-Code
15R
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
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