WIRE WOUND RESISTORS, FLAMEPROOF/RESIN PAINT
1. Applicable Scope:
This standard specification is for use in consumer electronics, computers, telecommunications, control
instruments...etc.
2. Part Number:
It is composed by Type, Terminal Form,Rated Wattage, Nominal Resistance , Tolerance and package. e.g.
P
1W
10Ω
J
T/B
KN
Type Terminal Form
Rated Wattage Nominal Resistance Tolerance Package
2.1 Type :
Wire Wound Resistors, Flameproof/Resin Paint are called "KN".
2.2 Terminal Form:
Upon the shape of terminal, there are "P" form, "Y" form and "H" form.
2.3 Rated Wattage:
Shown by "W", such as 1/4W, 1/2W, 1W, 2W, 3W, 5W, 6W, 7W,8W ,10W…
2.4 Nominal Resistance:
Ω,KΩ are its unit, which be in accordance with JIS-C6409 article 6 (EIA RS-196A) series.
2.5 Tolerance:
It is measured by Bridge-method at room temperature and expressed by a capital letter.
F＝±1%, G＝±2%, J＝±5%, K＝±10%.
2.6 Package:
T/R＝tape & reel ; T/B＝tape in box; Nil＝Bulk.
Remark:KN Series Resistors are RoHS Compliant.
3. Rated Power:
Rated power is the value of Max load voltage specified at the ambient temperature of 70℃, and shall meet
the functions of electrical and mechanical performance. When the ambient temperature surpasses above
mentioned temperature, the value declines as per following DERATING CURVE.
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WIRE WOUND RESISTORS, FLAMEPROOF/RESIN PAINT
3.1 Rated Voltage:
It is calculated through the following formula:
where E: rated voltage (V)
P: rated power (W)
E
=
PXR
R: total nominal resistance (Ω)
However, in case the voltage calculated exceeds the maximum load voltage, such the maximum load
voltage shall be regarded as its rated voltage, means whichever less.
4. Dimension and structure:
4.1 Dimension:
4.1.1 KNP TYPE:
unit：mm
TYPE
D±1
KNP
1/4W
1/2W
1W
2W
3W
3WL
5W
6W
7W
8W
2.6±0.5
3
4
5
5.5
5.5
6.5
8.5
8.5
8.5
6.8
9
9
11
13
15
19
24
32
41
28
28
28
28
38
38
38
38
33
38
0.6
0.65
0.65
0.8
0.8
0.8
0.8
0.8
0.8
0.8
L±1
H±3
d±0.1
(
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
Ω )
~
~
~
~
~
~
~
~
~
~
~
200
300
500
800
800
800
800
1K
1.5K
2.2K
3.3K
Resistance Range
Dielectric Withstanding
Voltage
250V
350V
350V
500V
500V
500V
500V
500V
500V
800V
1000V
10W
8.5
53
38
0.8
0.1
◎
Notes: Too low or too high ohmic values can be supplied only case by case.
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WIRE WOUND RESISTORS, FLAMEPROOF/RESIN PAINT
4.1.2 KNY：
Unit: mm
TYPE
KNY
5W
7W
10W
D±1
L±1.5
P±1.5
H±1
B±0.5
Resistance
Range
Dielectric
Withstanding
Voltage
500V
800V
1000V
8.5
8.5
8.5
25
32
53
15
22
42.5
21.5
21.5
21.5
6.5
6.5
6.5
0.5Ω~390Ω
0.5Ω~1.5KΩ
0.5Ω~2.2KΩ
4.1.3 KNH：
Unit: mm
TYPE
A±1.5
KNH
10W
15W
20W
25W
30W
40W
50W
60W
80W
100W
120W
150W
200W
300W
400W
600W
11
15.5
20
20
20
20
28
28
28
28
28
28
28
42
42
42
45
45
50
60
75
90
75
90
115
140
165
195
254
254
330
420
20
20
22
22
22
22
32
32
32
32
32
32
32
45
45
45
5
4.5
5
5
6
6
8
8
8
8
8
8
8
10
10
10
0.5Ω~3KΩ
1Ω~5KΩ
1Ω~10KΩ
1Ω~12.5KΩ
2Ω~15KΩ
2Ω~20KΩ
3Ω~25KΩ
3Ω~30KΩ
3Ω~40KΩ
4Ω~50KΩ
4Ω~60KΩ
5Ω~75KΩ
5Ω~100KΩ
5Ω~100KΩ
10Ω~100KΩ
10Ω~100KΩ
B±1.5
C±3
D±0.5
Resistance Range
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WIRE WOUND RESISTORS, FLAMEPROOF/RESIN PAINT
4.2 STRUCTURE:
4.2.1 Terminal:
Terminal is to be firmly connected with resistors element, both electrically and mechanically, and allow easy
soldering.
4.2.2 Coating:
Coating is done by light green flameproof paint (resistant to 800℃)or Silicon Resin which is solid enough to be
free from looseness, crack and easy breakage. It is also resistant to cleaning and industrial solvents, and the paint
shall be limited within 2mm of lead wires from resistor body.
4.2.3 Marking:
Marking is made on resistors surface, either by color coding or marked with Type of Resistor, Rated Wattage,
Nominal Resistance, Tolerance and Maker's trade mark(TY-OHM).
5. Operating Temperature Range: -55℃½200℃
6. Mechanical Performance:
6.1 Terminal tensile:
To fix the resistor body, a static load of 2.5kgs. (1W:1kg.)is to be gradually applied into the terminal
for 10 seconds without causing any looseness and fall.
6.2 Twist withstand:
To bend the lead wire at the point of about 6mm from resistor body to 90°, then catch the wire at 1.2±
0.4mm apart from the bent point end and turn it (clockwise) by 360 degrees perpendicular to the
resistor axis at speed of 10 seconds per turn, and do the same counterclockwise again which
constitute a whole turn. Repeat the turn 2 times without causing any break and looseness.
7. Electrical Performance:
7.1 Resistance Temperature Coefficient:
It shall be within ±300ppm/℃.(under 1Ω shell be within ±500ppm/℃)
6
T.C (ppm/℃) =［(R2－R1) ÷R1½ ×［1 ÷(T2－T1)½ ×10
where
R1: resistance value at reference temperature
R2: resistance value at test temp.
T1: reference temp. (usu. 25℃)
T2: test temp. (about 75℃)
7.2 Temperature Cycle:
Following temp. cycles are to be made 5 times and then put at room temp. for one hour, the
resistance value change rate between pre-and-post test shall be within ±1%.
Steps
1
st
step
2
nd
step
3
rd
step
4
th
step
Temperature(℃)
-55±3
Room temp.
200±3
Room temp.
Time (minutes)
30
3
30
3
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