Series BWF
Insulated Wirewound Resistors, moulded
flame retardant, failsafe
Specifications
Type
Style
BWF237-0
0411
BWF236-0
0614
Power rating P
70
Resistance range
W
Ω
0,75 (P
50
= 1,0)
0R1 ... 1K
1,5 (P
25
= 2,0)
0R1 ... 1K
E-Series
Tolerances
Temperature coefficient
max. cont. work. voltage
Insulation voltage (1min.)
Insulation resistance
Derating linear
Climatic category
Temperature range
Thermal resistance
Failure rate
(Total,
ϑ
o
max., 60% conf. lev.)
Endurance
(P
70
, 1000h)
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
o
E 24, E 12
%
10
-6
* K
-1
V
RMS
V
RMS
Ω
o
± 5, ± 10
- 400 ... + 1000, see table next page
√
P
700
70
·R
1000
> 10
4
M
70 ... 175 (0W)
55/175/56
C
C
140
- 55 ... 175
80
KW
-1
10
-9
* h
-1
appr. 100, depends on value
[
∆R
]
%
R
[
∆R
]
%
R
[
∆R
]
%
R
[
∆R
]
%
R
N
± 5,0 average
± 10,0 average
± 2,0
± 2,0
±1
40
[
∆R
]
%
R
s
± 0,2 typ.
2,5 Flowtime, solderglobule test, IEC 60068-2-20-T
DIN-IEC-colour code, 5 bands
(5th band (blue) for failsafe version)
Revision 200807
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 BWF
Series RWP
Dimensions in mm:
Series CRF
VITROHM
d
73
85
±1
Temperature coefficient
Typ
resistance
Value
0R1
0R11 ... 0R18
0R2 ...
0R75
0R68
... 1K
D
TC
* 10
-6
K
-1
BWF237-0
±
1000
±
600
±
300
±
150
±
1800
±
1000
±
800
±
400
BWF236-0
0R11
0R18
0R1
... 0R16
... 0R68
1K
0R75 ...
Type
BWF237-0
BWF236-0
L
±
0,2
9,9
14,3
Ø
D
±
0,2
3,6
5,7
Ø
d
±
0,02
0,8
1,0*
Tape step
5
10
*Special lead diameter 0,8 mm available, type BWF 236-006
Packaging:
Type
BWF236-0
BWF237-0
Packaging
taped/Ammopack
taped/Ammopack
Pieces
1000
1000
Pack.Code
T
T
Ordering example:
BWF 237-0
Type
5
Tolerance
T
Pack.-Code
1K
R-Value
Revision 200807
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 BWF Fusing Time
Type BWF 237-0
10R
100R
R10
1R
[s]
80
fusing time
60
40
20
0
1K
10
power rating
20 [ W ]
Type BWF 236-0
10R
R10
1R
[s]
80
60
40
20
0
2
10
100R
1K
fusing time
20 [ W ]
power rating
Revision 200807
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 BWF Pulse Rating
[Ws]
1.0
236 - 0
Pulse energy
(Impulsenergie)
0.8
237 - 0
0.6
0.4
0.2
0
0.1
1.0
10
100
1000 [Ω]
Resistance value
(Widerstandswert)
The curves are expressing the range, where no substantial effects are caused of
recurrent pulses.
(Die Kurven geben den Bereich an, in dem wiederholte impulse keine merklichen Effekte am
Widerstand hervorrufen.)
A single pulse with a 3 - 5 times higher value will cause the destruction of the
resistor!
(Ein Einzelimpuls mit 3 - 5 fachem Wert führt zur Zerstörung des Widerstandes!)
Revision 200807
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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