Leaded ResistoRs
Wirewound Resistors
Flame-Proof Type
Normal & Miniature Style [ KNP Series ]
FeatURes
Power Rating
Resistance Tolerance
T.C.R.
Flameproof Multi-layer Coating Meets
Flameproof Feature Meets Overload Test
1/4W, 1/2W, 1W, 2W, 3W, 4W, 5W, 7W
±1%, ±5%
±300ppm/°C
UL-94V-0
UL-1412
iNtRodUCtioN
The resistor element is a resistive wire which is
wound in a single layer on a ceramic rod, with
tinned connecting wires of electrolytic copper
welded to the end-caps. The ends of the
resistive wire and the leads are connected to
the caps by welding. The resistors are coated
with layers of green color flame-proof lacquer.
deRatiNG CURVe
For resistors operated in ambient temperatures above 40°C, power rating must be derated
in accordance with the curve below.
Rated Load (%)
40 70
100
80
60
40
20
50
100 150 200 250 300
3W-7W
1/4W-3WS
200
275 °C
Ambient Temperature (°C)
diMeNsioNs
stYLe
Normal
KNP-25
ød
H
L
øD
KNP-50
KNP100
KNP200
KNP300
KNP400
KNP500
KNP700
Note: KNP1WS ( for MB Type ) ød = 0.8±0.05 mm
Unit: mm
diMeNsioN
Miniature
NP50S
KNP1WS
KNP2WS
KNP3WS
KNP5WS
KNP7WS
-
L
6.3±0.5
9.0±0.5
11.5±1.0
15.5±1.0
17.5±1.0
24.5±1.0
24.5±1.0
ød
2.4±0.2
3.3±0.3
4.5±0.5
5.0±0.5
6.5±0.5
8.0±0.5
8.0±0.5
H
28±2.0
26±2.0
35±2.0
33±2.0
32±2.0
38±2.0
38±2.0
ød
0.55±0.05
0.55±0.05
0.8±0.05
0.8±0.05
0.8±0.05
0.8±0.05
0.8±0.05
eLeCtRiCaL CHaRaCteRistiCs
NoRMaL stYLe
stYLe
Power Rating at 40°C
Power Rating at 70°C
Voltage Proof
Resistance Range (±1%)
Resistance Range (±5%)
Operating Temp. Range
Temperature Coefficient
1/4W
250V
1/2W
300V
1W
400V
0.1
Ω
- 1.8K
Ω
0.1
Ω
- 2.8K
Ω
0.1
Ω
- 7.5K
Ω
0.1
Ω
- 6.5K
Ω
0.03
Ω
- 6.8K
Ω
2W
KNP-25
KNP-50
KNP100
KNP200
KNP300
3W
KNP400 KNP500
4W
5W
KNP700
7W
0.22
Ω
- 150
Ω
0.1
Ω
- 800
Ω
0.05
Ω
- 200
Ω
0.03
Ω
- 800
Ω
0.015
Ω
- 2.2K
Ω
0.015
Ω
- 2.8K
Ω
0.02
Ω
- 7.5K
Ω
-40°C to +200°C
±300ppm/°C
Note: Special value is available on request
MiNiatURe stYLe
stYLe
Power Rating at 40°C
Power Rating at 70°C
Voltage Proof
Resistance Range (±1%)
Resistance Range (±5%)
Operating Temp. Range
Temperature Coefficient
1/2W
200V
0.22
Ω
- 150
Ω
0.05
Ω
- 200
Ω
-40°C to +200°C
±300ppm/°C
1W
300V
0.1
Ω
- 800
Ω
0.03
Ω
- 800
Ω
2W
400V
0.1
Ω
- 1.8K
Ω
0.015
Ω
- 2.2K
Ω
0.1
Ω
- 2.8K
Ω
0.015
Ω
- 2.8K
Ω
0.1
Ω
- 7.5K
Ω
0.02
Ω
- 7.5K
Ω
0.1
Ω
- 6.5K
Ω
0.03
Ω
- 6.8K
Ω
3W
KNP50s
KNP1Ws
KNP2Ws
KNP3Ws
KNP5Ws
5W
KNP7Ws
7W
Note: Special value is available on request
eNViRoNMeNtaL CHaRaCteRistiCs
PeRFoRMaNCe test
Short Time Overload
Voltage Proof
Temperature Coefficient
Insulation Resistance
Solderability
Solvent Resistance of Marking
Robustness of Terminations
Damp Heat Steady State
Endurance at 70°C
Temperature Cycling
Resistance to Soldering Heat
Accidental Overload Test
test MetHod
IEC 60115-1 4.13
IEC 60115-1 4.7
IEC 60115-1 4.8
IEC 60115-1 4.6
IEC 60115-1 4.17
IEC 60115-1 4.30
IEC 60115-1 4.16
IEC 60115-1 4.24
IEC 60115-1 4.25
IEC 60115-1 4.19
IEC 60115-1 4.18
IEC 60115-1 4.26
10 times rated power for 5 Sec.
in V-block for 60 Sec., test voltage by type
-55°C to +155°C
in V-block for 60 Sec.
235±5°C for 3±0.5 Sec
IPA for 5±0.5 Min. with ultrasonic
Direct load for 10 Sec. in the direction of the terminal leads
40±2°C, 90-95% RH for 56 days, loaded with 0.1 times RCWV
70±2°C at RCWV for 1,000 Hr. (1.5 Hr. on, 0.5 Hr. off)
-55°C
Room Temp.
+155°C
Room Temp. (5 cycles)
260±3°C for 10±1 Sec., immersed to a point 3±0.5mm from the body
4 times RCWV for 1 Min.
aPPRaise
±2.0%+0.05
Ω
By type
By type
>100M
Ω
95% Min. coverage
No deterioration of
coatings and markings
≥2.5kg (24.5N)
±5.0%+0.05
Ω
±5.0%+0.05
Ω
±1.0%+0.05
Ω
±1.0%+0.05
Ω
No evidence of flaming
or arcing
Note: Rated Continuous Working Voltage (RCWV) =
Power Rating x Resistance Value
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