Datasheet

Series CRF V I T R O H M
Revision 201501
VITROHM PORTUGUESA, Lda. – Est. Nacional 249-4, Trajouce – 2765-653 S. Domingos de Rana – PORTUGAL File Nr: 3200.18.450.121.11
Tel:+ 351 214 457 700 - Fax:+ 351 214 457 755 – Germany Sales Tel:+ 49 4121 870 103 - e-mail: [e-mail] – www.vitrohm.com 1
Precision Fusible safety Wirewound Resistors
Axial, Ceramic core
Flame retardant coating
ELECTRICAL SPECIFICATIONS
Type
CRF
251-4
CRF
252-4
CRF
253-4
CRF
254-4
CRF
256-4
CRF
257-4
Nominal Power rating
P
40
[W]
1,1 2,0 2,5 3,0 4,0 5,0
P
70
1,0 1,8 2,3 2,7 3,6 4,5
Resistance range [Ω]
See next page
(higher values upon request)
E-Series E24
Tolerances ± [%] 5
Temperature coefficient [10
-6
*K
-1
] 120
±50
Temperature range [ºC] -55 … +350
Thermal resistance [KW
-1
] 280 155 127 103 77 62
Dielectric withstanding voltage
IEC115-1 clause 4.7 (1[min])
[V] max 500
Max. working voltage
[V]
RMS
PERFORMANCE DATA
Derating linear
[ºC]
70…350 (0W)
Climatic category
55/350/56
Failure Rate
(Total, 


, max, 60[%] cont. lev.)
[10
-9
h
-1
]
appr. 10 depends on value
Endurance
IEC60115-1 clause 4.25
(P
70
, @ 70[°C], 1000[h])
± [%]
5,0
Damp heat, steady state
IEC115-1clause 4.24
(40[°C], 93[% r.h.], 56[d])
± [%] 5,0
Climatic sequence
IEC115-1 clause4.23
± [%]
2,0
Surge test
IEC61000-4-5
± [%]
2,0
Terminal strength ± [%]
0,2
Terminal Tensile Strength [N]
40 50
Resistance to soldering heat
IEC115-1 clause 4.12
(260[°C], 10[s])
± [%]
0,5
Solderability
IEC 60068-2-20
(245
±3
[ºC] 3
±0,3
[s])
Solder bath method (min. 95[%] coverage)
Marking
IEC60062
Printed in clear