WF
thermal fuse built-in resistors
H
resistors
EU
features
•
Marking: Ceramic body with alpha/numeric marking
•
Products with lead-free terminations meet EU RoHS
requirements. Pb located in glass material, electrode
and resistor element is exempt per Annex 1, exemption
5 of EU directive 2005/95/EC
dimensions and construction
W
D
Ceramic Case
Cement
Thermal Fuse
Resistor
Type
WF5N
WF7N
WF10N
4.5
+2
-1
P
ød
W
D
Dimensions
inches
(mm)
H
P
d (R. Lead) d (Fuse Lead)
1.00±.059
+.079
.512±.039 .354±.039
(25.5±1.5)
.197
-.039
(13.0±1.0) (9.0±1.0)
1.52±.059
(5
+2
)
-1
(38.5±1.5)
+.079
.630±.039 .472±.039 1.38±.059 .295
-.039
+2
(16.0±1.0) (12±1.0)
(35±1.5)
(7.5
-1
)
.031
(0.8)
2A: 0.6
10A: 1.0
Lead Wire
ordering information
New Part #
WF
Type
5N
Style
5N
7N
10N
C
Terminal Surface
Temperature
C: SnCu
8
Thermal Fuse
Symbol
See table
below
G
Resistor
Material
G: Glass core
wire wound
S: Metal oxide
film
100
Nominal
Resistance
3 digits
K
Resistance
Tolerance
J: ±5%
K: ±10%
applications and ratings
Thermal
Fuse
Symbol
8
10
12
14
32
33
34
35
Thermal Fuse
Thermal
Current
Cut-off Temp. Rating
129±2 (STD)
152±2
+3
188
-1
+1
226
-3
110±2
126±2
130±2 (STD)
+3
146
-2
Voltage
Rating
5N
1.6
1.6
2.0
2.0
1.2
1.4
1.6
1.6
Power Rating
(W)
7N
2.0
2.0
2.4
2.4
1.4
1.6
2.0
2.0
10N
2.5
2.5
3.5
3.5
––
––
––
––
Resistance Range/
Material (Ω)
Resistance
Tolerance
Maximum
Working
Voltage
Maximum
Overload
Voltage
G: Glass S: Metal G: Glass S: Metal
Core
Oxide
Core
Oxide
Wirewound
Film
Wirewound
Film
10A
250V
2A
1 - 100
(E24)
110 - 10k
J: ±5%
(E24)
K: ±10%
J: ±5%
E=
√
P • R
E=
√
P • R • 6.25
* Other combinations of thermal cut-off temperatures and resistance values are available on request
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
1/06/09
158
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
thermal fuse built-in resistors
environmental applications
Derating Curve
100
Percent Rated Power
(%)
Temp. Symbol
100
Percent Rated Power
(%)
Temp. Symbol
80
60
10˚
80
60
40
20
0
33˚
32˚
-25
-20
25
20
35˚
34˚
40
20
8˚
14˚
12˚
133 147
120
140
160
0
-25
-20
0
25
20
75
40
60
89 100
80
100
0
40
60
68 75 91 95 105
80
100 120
140
160
Ambient Temperature
(˚C)
Ambient Temperature
(˚C)
Temperature Rise
200
Temperature Rise (deg)
5N
150
7N
100
10N
50
Measuring Point
2
4
6
8
Load Power (W)
For resistors operated at an ambient temperature of 25°C or above, a
power rating shall be deleted in accordance with the above rating curves.
0
Performance Characteristics
Parameter
Resistance
T.C.R.
Overload (Short Time)
Resistance to Soldering Heat
Moisture Resistance
Load Life
Requirement
∆
R ±(%+0.05Ω)
Limit
Typical
Within specified
—
tolerance
±250 x 10
-6
/K (G)
—
±300 x 10
-6
/K (S)
±2%
±1%
±5%
±5%
±1.8%
±0.9%
±4.5%
±4.5%
Test Method
25°C
+25°C/-55°C and +25°C/+125°C
Rated voltage x 6.25 for 5 seconds
350°C ± 10°C, 3.5 seconds
40°C, 90% - 95% RH, 500 hours, No load
Rated voltage, 25°C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
12/30/10
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
159
resistors
WF
Microcontroller MCU
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