DATA SHEET
LEADED POWER RESISTORS
0.75 W – 1.5 W
BWF - FUSIBLE insulated wirewound (moulded)
Product Specification - Jun. 18, 2003 V.0
Series BWF
Insulated Wirewound Resistors, moulded
flame retardant, failsafe
Specification
Type
Style
Power rating P
70
Resistance range
E-series
Tolerance
Temperature coefficient
max. cont. working voltage
Insulation voltage (1min.)
Insulation resistance
Derating linear
Climatic category
Temperature range
Thermal resistance
Failure rate (Total,
ϑ
0
max., 60% conf. lev.)
Endurance (P
70
, 70°C, 1000h)
Damp heat, steady state (40°C, 93% r. h., 56d)
Climatic sequence
°C
KW
-1
10
-9
∗
h
-1
∆R
R
∆R
R
∆R
R
BWF237-0
0411
W
Ω
0,75 (P
50
= 1,0)
0R1 ... 1K0
E 24, E 12
%
10
-6
∗
K
-1
V
RMS
V
RMS
Ω
°C
700
> 10
4
M
70 ... 175 (0W)
55/175/56
- 55 ... 175
140
± 5, ± 10
-400 ... +1000
see also page 2
P
70
•
R
BWF236-0
0614
1,5 (P
25
= 2,0)
0R1 ... 1K0
1000
80
appr. 100, depends on value
± 5,0 average
± 2,0
± 2,0
± 10,0 average
%
%
%
Yageo Europe GmbH Ramskamp 70 D-25337 Elmshorn Germany Ph.: +49 4121 870-0 F.: +49 4121 870-297
File: BWF_E103 (02)
28.04.03
Page 1 of 4
Series BWF
Insulated Wirewound Resistors, moulded
flame retardant, failsafe
Type
Resistance to soldering heat (260°C, 10s)
Solderability
Terminal strength
Terminal tensile strength
Marking
∆R
%
R
BWF237-0
± 0,2 typ.
BWF236-0
s
∆R
%
R
2,5 Flowtime, solderglobule test IEC 60068-2-20-T
±1
40
DIN-IEC-colourcode, 5 bands
(5th band (blue) for failsafe version)
N
Temperature coefficient
Type
BWF237-0
Value
R10
R11 ... R18
R30 ... R68
R75 ... 1K0
TC
± 1000
± 600
± 300
± 150
± 1800
± 1000
± 800
± 400
BWF236-0
R10
R11 ... R16
R18 ... R68
R75 ... 1K0
Yageo Europe GmbH Ramskamp 70 D-25337 Elmshorn Germany Ph.: +49 4121 870-0 F.: +49 4121 870-297
File: BWF_E103 (02)
28.04.03
Page 2 of 4
Series BWF
Insulated Wirewound Resistors, moulded
flame retardant, failsafe
Dimensions in mm:
Type
BWF237-0
BWF236-0
Fusing characteristic:
L
±0,2
9,9
14,3
øD
±0,2
3,6
5,7
ød
±0,02
0,8
1,0
Tape step
5
10
Yageo Europe GmbH Ramskamp 70 D-25337 Elmshorn Germany Ph.: +49 4121 870-0 F.: +49 4121 870-297
File: BWF_E103 (02)
28.04.03
Page 3 of 4
Series BWF
Insulated Wirewound Resistors, moulded
flame retardant, failsafe
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
1K0
R-Value
Yageo Europe GmbH Ramskamp 70 D-25337 Elmshorn Germany Ph.: +49 4121 870-0 F.: +49 4121 870-297
File: BWF_E103 (02)
28.04.03
Page 4 of 4