Through-hole resistors
Flame-Proof &
Non-Inductive Type
Wirewound Resistors
Normal & Miniature Style [ NKN Series ]
FEATURES
INTRODUCTION
Power Rating
1/2W, 1W, 2W, 3W, 4W, 5W, 7W
Resistance Tolerance
±2% , ±5%
T.C.R.
±300ppm/°C
Flameproof Multi-layer Coating Meets
UL-94V-0
Flameproof Feature Meets Overload Test
UL-1412
DERATING CURVE
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 are connected to the caps by
welding. The resistors are coated with layers of
green color flame-proof lacquer. The 5th color
band is black to represent NKN series.
For resistors operated in ambient temperatures above 40°C, power rating must be derated
in accordance with the curve below.
Rated Load (%)
40 70
200
275 °C
100
3W-7W
80
1/2W-3WS
60
40
20
50
100 150 200 250 300
Ambient Temperature (°C)
DIMENSIONS
Unit: mm
STYLE
ød
H
L
5th color code: black
øD
DIMENSION
Normal
Miniature
L
øD
H
ød
NKN-50
NKN1WS
9.0±0.5
3.5+0.6/-0.3
26±2.0
0.55±0.05
NKN100
NKN2WS
11.5±1.0
4.6+1.0/-0.5
35±2.0
0.8±0.05
NKN200
NKN3WS
15.5±1.0
5.2+1.0/-0.5
33±2.0
0.8±0.05
NKN5WS
17.5±1.0
6.5±1.0
32±2.0
0.8±0.05
NKN7WS
24.5±1.0
8.5±1.0
38±2.0
0.8±0.05
NKN300
NKN400
NKN500
45
ELECTRICAL CHARACTERISTICS
Normal STYLE
STYLE
NKN-50
NKN100
NKN200
Power Rating at 40°C
Power Rating at 70°C
1/2W
1W
NKN300
NKN400
NKN500
3W
4W
5W
2W
Maximum working voltage
PxR
Voltage Proof on Insulation
250V
400V
Resistance Range
0.08Ω - 15Ω
0.1Ω - 40Ω
Operating Temp. Range
-40°C to +200°C
Temperature Coefficient
±300ppm/°C
0.1Ω - 90Ω
0.1Ω - 120Ω
0.18Ω - 220Ω
Note: Special value is available on request
MINIATURE STYLE
STYLE
NKN1WS
NKN2WS
NKN3WS
Power Rating at 40°C
Power Rating at 70°C
1W
2W
Maximum working voltage
PxR
Voltage Proof on Insulation
250V
400V
Resistance Range
0.08Ω - 15Ω
0.1Ω - 40Ω
Operating Temp. Range
- 40°C to +200°C
Temperature Coefficient
±300ppm/°C
NKN5WS
NKN7WS
5W
7W
0.1Ω - 120Ω
0.18Ω - 220Ω
3W
0.1Ω - 90Ω
Note: Special value is available on request
ENVIRONMENTAL CHARACTERISTICS
PERFORMANCE TEST
TEST METHOD
APPRAISE
Short Time Overload
IEC 60115-1 4.13
10 times rated power for 5 Sec.
±2.0%+0.05Ω
Voltage Proof on Insulation
IEC 60115-1 4.7
In V-Block for 60 sec., test voltage as above table
No Breakdown
Temperature Coefficient
IEC 60115-1 4.8
Between -40°C to +155°C
By type
Insulation Resistance
IEC 60115-1 4.6
in V-block for 60 Sec.
>100MΩ
Solderability
IEC 60115-1 4.17
245±5°C for 3±0.5 Sec.
95% Min. coverage
Solvent Resistance of Marking
IEC 60115-1 4.30
IPA for 5±0.5 Min. with ultrasonic
No deterioration of
coatings and markings
Robustness of Terminations
IEC 60115-1 4.16
Direct load for 10 Sec. in the direction of the terminal leads
≥2.5kg (24.5N)
Damp Heat Steady State
IEC 60115-1 4.24
40±2°C, 90-95% RH for 56 days, loaded with 0.1 times RCWV
±5.0%+0.05Ω
Endurance at 70°C
IEC 60115-1 4.25
70±2°C at RCWV (or Umax., Whichever less) for 1,000 Hr. (1.5Hr.on, 0.5Hr. Off) ±5.0%+0.05Ω
Temperature Cycling
IEC 60115-1 4.19
-55°C Room Temp. +155°C Room Temp. (5 cycles)
±1.0%+0.05Ω
Resistance to Soldering Heat
IEC 60115-1 4.18
260±3°C for 10±1 Sec., immersed to a point 3±0.5mm from the body
±1.0%+0.05Ω
Accidental Overload Test
IEC 60115-1 4.26
4 times RCWV for 1 Min.
No evidence of flaming
or arcing
Note: Rated Continuous Working Voltage (RCWV) = Power Rating x Resistance Value or Max. working voltage listed above, whichever less.
Revision: 2020
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