Through-hole resisTors
Wirewound Resistors
Flame-Proof &
Non-Inductive Type
Normal & Miniature Style [ NKN Series ]
FeATures
Power Rating
Resistance Tolerance
T.C.R.
Flameproof Multi-layer Coating Meets
Flameproof Feature Meets Overload Test
1/2W, 1W, 2W, 3W, 4W, 5W, 7W
±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 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.
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
1/2W-3WS
200
275 °C
Ambient Temperature (°C)
DiMeNsioNs
sTYle
Normal
NKN-50
ød
H
L
5th color code: black
øD
NKN100
NKN200
NKN300
NKN400
NKN500
NKN5WS
NKN7WS
17.5±1.0
24.5±1.0
6.5±0.5
8.5±0.5
32±2.0
38±2.0
Miniature
NKN1WS
NKN2WS
NKN3WS
DiMeNsioN
l
9.0±0.5
11.5±1.0
15.5±1.0
øD
3.5±0.3
4.8±0.5
5.3±0.5
h
26±2.0
35±2.0
33±2.0
Unit: mm
ød
0.55±0.05
0.8±0.05
0.8±0.05
0.8±0.05
0.8±0.05
51
eleCTriCAl ChArACTerisTiCs
NorMAl sTYle
sTYle
Power Rating at 40°C
Power Rating at 70°C
Maximum working voltage
Voltage Proof on Insulation
Resistance Range
Operating Temp. Range
Temperature Coefficient
1/2W
PxR
250V
0.08Ω - 15Ω
-40°C to +200°C
±300ppm/°C
400V
0.1Ω - 40Ω
0.1Ω - 90Ω
0.1Ω - 120Ω
0.18Ω - 220Ω
1W
2W
NKN-50
NKN100
NKN200
NKN300
3W
NKN400
4W
NKN500
5W
Note: Special value is available on request
MiNiATure sTYle
sTYle
Power Rating at 40°C
Power Rating at 70°C
Maximum working voltage
Voltage Proof on Insulation
Resistance Range
Operating Temp. Range
Temperature Coefficient
1W
PxR
250V
0.08Ω - 15Ω
- 40°C to +200°C
±300ppm/°C
400V
0.1Ω - 40Ω
0.1Ω - 90Ω
0.1Ω - 120Ω
0.18Ω - 220Ω
2W
3W
NKN1Ws
NKN2Ws
NKN3Ws
NKN5Ws
5W
NKN7Ws
7W
Note: Special value is available on request
eNViroNMeNTAl ChArACTerisTiCs
PerForMANCe TesT
Short Time Overload
Voltage Proof on Insulation
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%+0.05Ω
By type
By type
>100MΩ
95% Min. coverage
No deterioration of
coatings and markings
≥2.5kg (24.5N)
±5.0%+0.05Ω
±5.0%+0.05Ω
±1.0%+0.05Ω
±1.0%+0.05Ω
No evidence of flaming
or arcing
Revision: 201304
Note: Rated Continuous Working Voltage (RCWV) =
Power Rating x Resistance Value or Max. working voltage listed above, whichever less.
88
exPlANATioNs oF orDeriNg CoDe
MFr
Code 1 - 3
series Name
See Index
-12
Code 4 - 6
Power rating
-05 = ød0.5mm
-06 = ød0.6mm
-07 = ød0.7mm
-08 = ød0.8mm
-10 = ød1.0mm
-14 = ød1.4mm
-12 = 1/6W
-25 = 1/4W
25S = 1/4WS
-50 = 1/2W
50S = 1/2WS
100 = 1W
1WS = 1WS
200 = 2W
2WS = 2WS
204 = 0.4W
207 = 0.6W
300 = 3W
3WS = 3WS
3WM = 3WM
400 = 4W
500 = 5W
5WS = 5WS
5SS = 5WSS
700 = 7W
7WS = 7WS
10A = 10W
20A = 20W
30A = 30W
40A = 40W
50A = 50W
10S = 10WS
15A = 15W
25A = 25W
10B = 100W
25B = 250W
F
Code 7
Tolerance
P = ±0.02 %
A = ±0.05 %
B = ±0.1 %
C = ±0.25%
D = ±0.5 %
F = ±1 %
G = ±2 %
J = ±5 %
K = ±10 %
- = Base on Spec.
T
Code 8
Packing style
T = Tape/Box
R = Tape/Reel
B = Bulk
F
Code 9
Temperature Coef-
ficient of Resistance
- = Base on Spec.
A = ±5 ppm/°C
B = ±10 ppm/°C
C = ±15 ppm/°C
S = ± 20ppm/°C
D = ±25 ppm/°C
E = ±50 ppm/°C
F = ±100 ppm/°C
G = ±200 ppm/°C
H = ±250 ppm/°C
I = ±300 ppm/°C
J = ±350 ppm/°C
52-
Code 10 - 12
Forming Type
26- = 26mm
52- = 52.4mm
73- = 73mm
81- = 81mm
91- = 91mm
F = F Type
FK = FK Type
FKK = FKK Type
FFK = F-form Kink
M = M-Type Forming
MB = M-form W/flat
MT = MT Type Forming
MR = MR Type
AV = AVIsert
PN = PANAsert
100r
Code 13 - 17
resistance Value
0R1 = 0.1
100R = 100
10K = 10,000
10M = 10,000,000
exCePTioN:
• Cement series:
• JPW series:
<Code 8>: Special packing style code
B: Bulk with wirewound or metal oxide sub-assembly for resistance value
W: Bulk with ceramic based wirewound sub-assembly for resistance value
M: Bulk with metal oxide sub-assembly for resistance value
F: Bulk with Fiberglass based wirewound sub-assembly for resistance value
<Code 10-12>: Without forming code
Example:
<Code 13-17>: without resistance value code
Example:
JPW-06-T-52-
SQP500JB-10R
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