Wirewound Resistors
Applications:
• Power supplies
• Process control instrumentation
• Computers
• Communication equipment
Features:
• Excellent flame resistance
• Non-inductive types available
• Availability of Very low or Very high ohmic values can be supplied upon request. Please consult factory
for extended Ranges
(1) KNP Type
Series
KNP-1/2W
KNP-1W
KNP-2W
KNP-3W
KNP-5W
KNP-7W
KNP-8W
KNP-9W
(2) KNPS Type
Normal Size
Resistance
+0.02
L
Range
Max. H ± 3 d -0.05
10.0
12.0
16.0
17.5
25.0
30.0
40.0
53.0
28
28
28
28
38
38
38
38
0.7
0.7
0.8
0.8
0.8
0.8
0.8
0.8
.05Ω 250Ω
.01Ω 400Ω
.01Ω 470Ω
.05Ω 600Ω
.01Ω 1KΩ
0.1Ω 1KΩ
.1Ω 1.5KΩ
.1Ω 1.5KΩ
D
±1
4.0
5.0
5.5
6.5
8.0
8.0
8.0
8.0
Series
KNPS-1W
KNPS-2W
KNPS-3W
KNPS-5W
KNPS-7W
KNPS-8W
KNPS-9W
KNPS-10W
D
±1
4.0
5.0
5.5
6.5
8.0
8.0
8.0
8.0
Normal Size
Resistance
+0.02
L
Range
Max. H ± 3 d -0.05
10.0
12.0
16.0
17.5
25.0
30.0
40.0
53.0
28
28
28
28
38
38
38
38
0.6
0.7
0.8
0.8
0.8
0.8
0.8
0.8
.05Ω 250Ω
.01Ω 400Ω
.01Ω 470Ω
.05Ω 600Ω
0.1Ω 1KΩ
0.1Ω 1KΩ
.1Ω 1.5KΩ
.1Ω 1.5KΩ
ød
H
L
H
D
(3) KNS Type
Dimension (mm)
Series
KNS-2W
KNS-3W
KNS-5W
KNS-7W
KNS-8W
KNS-10W
D Max L± 1.5 P± 0.5
7
8
10
10
10
10
19
21
26
31
41
54
8
10
15
20
30
43
H±1
19.0
19.0
21.5
21.5
21.5
21.5
h± 1
12
13
13
13
13
13
B± 0.5
4.5
4.5
6.0
6.0
6.0
6.0
Resistance
Range
0.1Ω 50Ω
0.5Ω 50Ω
0.5Ω 100Ω
1Ω 1KΩ
1Ω 1.5KΩ
1Ω 2KΩ
D
D
L ±1.5
H
H
h
±0.1
0.9
±0.1
0.7
±0.5
4.5
4.5
3 ± 0.1
±0.5
±0.1
0.4
P±0.5
B
B
Sterminal
7267 Coldwater Canyon, North Hollywood. California 91605 • Phone (818) 765-8300 • Toll Free (800) 827-7422 • Fax (818) 765-2387
E23
A
Wirewound Resistors
(4) KNH Type
Dimension (mm)
Series
KNH-5W
KNH-10W
KNH-15W
KNH-20W
KNH-30W
KNH-40W
KNH-50W
KNH-60W
KNH-80W
KNH-100W
A± 1.5
11.0
11.0
15.5
19.0
19.0
19.0
28.0
28.0
28.0
28.0
100
Percent rated load (%)
B± 1.5
30
45
45
50
75
90
75
90
115
140
C± 3
16
16
17
19
19
19
31
31
31
31
70
155
D± 0.5
Resistance
Range
0.2Ω 1KΩ
0.2Ω 3KΩ
0.3Ω 5KΩ
0.4Ω 10KΩ
0.5Ω 15KΩ
0.6Ω 20KΩ
3Ω 25KΩ
3Ω 30KΩ
3Ω 40KΩ
3Ω 50KΩ
D
4.0
4.0
4.0
4.5
4.5
4.5
8.0
8.0
8.0
8.0
275
Aø
B
200
Heat rise (°C)
10W
8W
5W , 6W
2W , 3W
Derating
Curve
80
60
40
20
0
-50 0
50
150
Ambient temperature (°C)
Heat Rise
Chart
150
100
50
0
50
Rated load (%)
100
200 250
300
Performance Specifications
Characteristics
Temperature coefficient
JIS-C-5202 5.2
Humidity (Steady state)
JIS-C-5202 7.5
Short-time overload
JIS-C-202 5.5
Load life in humidity
JIS-C-5202 7.9
Load life
JIS-C-5202 7.10
± 300PPM/°C
< 20Ω±400PPM/°C
Resistance change rate is ± (3% +0.05Ω)
Max. with no evidence of mechanical damage
Resistance change rate ± (2% +0.05Ω)
Max. with no evidence of mechanical damage
Resistance change rate ± (5% +0.05Ω)
Max. with no evidence of mechanical damage
Resistance change rate ± (5% +0.05Ω)
Max. with no evidence of mechanical damage
Limits
Test Methods
Natural resistance change per temp. degree centigrade.
R
1
: Resistance value at room temperature (t
1
)
R
2
: Resistance value at room temperature plus 100°C (t
2
)
Test Pattern: Room temp., Room temp. plus 100°C
Temporary resistance change after a 240 hours exposure in a humidity
test chamber controlled at 40°C ± 2°C and 90 to 95% relative humidity.
Permanent resistance change after the application of a potential of 2.5
times RCWV for 5 seconds.
Resistance change after 1,000 hours operating at RCWV with duty cycle of 1.5 hours
“on” ,0.5 hour “off” in a humidity test chamber controlled at 40°C ± 2°C and 90 to
95% relative humidity.
Permanent resistance change after 1,000 hours operating at RCWV with duty cycle
of 1.5 hours “on”, 0.5 hour “off” at 70°C ± 2°C ambient.
Direct Load:
Resistance to a 2.5kg direct load for 10 seconds in the direction of
the longitudinal axis of the terminal leads.
Twist test:
Terminal leads shall be bent through 90° at a point of about 6mm
from the body of the resistor and shall be rotated through 360° about
the original axis of the bent terminal in alternating direction for a total
of 3 rotations.
Permanent resistance change when leads immersed to 3.2 - 4.8mm from
the body in 350°C ± 10°C solder for 3 ± 0.5 seconds.
The area covered with a new, smooth, clean, shiny and continuous surface
free from concentrated pinholes.
Test temp. of solder: 235°C ± 5°C
Dwell time in solder: 3 seconds
Terminal strength
JIS-C-5202 6.1
No evidence of mechanical damage
Resistance to soldering heat
JIS-C-5202 6.4
Solderability
JIS-C-5202 6.5
Resistance change rate is ± (1% +0.05Ω)
Max. with no evidence of mechanical damage
95% coverage Min.
Part Numbering System
2W
KNP
Type
KNP
KNPS
KNS
KNH
103
Nominal Resistance
3 Digits
e.g. 2R2 = 2.2
e.g. 102 = 1K
J
Resistance
Tolerance
J = ±5 %
G = ±2 %
F = ±1 %
T
Packaging
T = Tape and Reel
B = Bulk
Rated Power
1W
100W
7267 Coldwater Canyon, North Hollywood. California 91605 • Phone (818) 765-8300 • Toll Free (800) 827-7422 • Fax (818) 765-2387
E24
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