158 KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
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
resistors
WF
thermal fuse built-in resistors
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
C: SnCu5N
7N
10N
See table
below
WF
Type Style Terminal Surface
Temperature Thermal Fuse
Symbol
New Part # 5N 8C
3 digits
Nominal
Resistance
100
D
ø d
W
P
4.5+2
-1
H
Ceramic Case
Cement
Thermal Fuse
Resistor
Lead Wire
dimensions and construction
W
1.00±.059
(25.5±1.5)
WF5N
DHP
d (R. Lead)
Dimensions inches (mm)
Type
ordering information
G:Glass core
wire wound
S: Metal oxide
film
Resistor
Material
G
.197 +.079
-.039
(5 +2 )
-1
WF7N
.512±.039
(13.0±1.0)
WF10N .295 +.079
-.039
(7.5 +2 )
-1
.031
(0.8)
1.38±.059
(35±1.5)
.472±.039
(12±1.0)
.630±.039
(16.0±1.0)
d (Fuse Lead)
.354±.039
(9.0±1.0) 1.52±.059
(38.5±1.5) 2A: 0.6
10A: 1.0
J: ±5%
K: ±10%
Resistance
Tolerance
K
EU
* Other combinations of thermal cut-off temperatures and resistance values are available on request
Thermal
Fuse
Symbol
Thermal Fuse Power Rating
(W) Resistance
Tolerance Maximum
Working
Voltage
Maximum
Overload
Voltage
applications and ratings
8
10
12
14
152±2
188 +3
-1
226 +1
-3
10A
1.6
1.6
2.0
2.0 J: ±5% E= √P • R E=
√P • R • 6.25
2.0
2.0
2.4
2.4
2.5
2.5
3.5
3.5
32
110±2
2A
1.2 1.4 ––
129±2 (STD)
Thermal
Cut-off Temp. Current
Rating Voltage
Rating 5N 10N7N
J: ±5%
K: ±10%
250V
Resistance Range/
Material (Ω)
110 - 10k
(E24)
G: Glass
Core
Wirewound
S: Metal
Oxide
Film
S: Metal
Oxide
Film
G: Glass
Core
Wirewound
1 - 100
(E24)
33
126±2 1.4 1.6 ––
34
35
130±2 (STD)
146 +3
-2
1.6
1.6
2.0
2.0
––
––
WF
thermal fuse built-in resistors
Derating Curve
environmental applications
Percent Rated Power
(%)
100
80
60
40
Ambient Temperature
(˚C)
20
0
-25
-20 0 2040
25
80 100120140160
75 89 100133147
60
10˚
8˚ 12˚
14˚
Temp. Symbol
Temperature Rise
200
100
268
Load Power (W)
0
150
50
Temperature Rise (deg)
4
5N
7N
10N
Measuring Point
Performance Characteristics
Parameter
Requirement ∆R ±(%+0.05Ω)
Limit Typical Test Method
T.C.R.
Resistance
+25°C/-55°C and +25°C/+125°C
25°C
±250 x 10-6/K (G)
±300 x 10-6/K (S)
Within specified
tolerance
—
—
Overload (Short Time) Rated voltage x 6.25 for 5 seconds
±2% ±1.8%
Percent Rated Power
(%)
100
80
60
40
Ambient Temperature
(˚C)
20
0
-25
-20 0 2040
25
80100120140160
75 91 105
60
32˚
35˚
34˚
68 95
33˚
T
Temp. Symbol
Resistance to Soldering Heat 350°C ± 10°C, 3.5 seconds
±1% ±0.9%
Moisture Resistance 40°C, 90% - 95% RH, 500 hours, No load
±5% ±4.5%
Load Life Rated voltage, 25°C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
±5% ±4.5%
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.
resistors
159
KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
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
