CEMENT RESISTORS
1. Applicable Scope:
This type standard specification is for use in consumer electronics, computer,
telecommunications equipments...etc.
2. Part Number:
It is composed by Type, Type Form, Rated Wattage, Nominal resistance and Tolerance.
e.g.
SQ
Type
M
Type Form
5W
Rated Wattage
10Ω
Nominal Resistance
J
Tolerance
2.1 Type:
Cement Resistors are called "SQ".
2.2 Type Form:
Upon the shape of type form there are "P" form, "M" form, "Z" form, "S" form and
"H" form.
2.3 Rated Wattage:
Shown by 'W', such as 1W, 2W, 3W, 5W,....40W.
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%.
Remark :SQ 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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CEMENT RESISTORS
3.1 Rated Voltage:
It is calculated through the following formula:
E
=
PXR
where E: rated voltage (V)
P: rated power (W ) 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 & Structure:
4.1 DIMENSION:
4.1.1 SQP:
Type
SQP
2W
3W
5W
7W
10W
15W
20W, 25W
Notes: 1.
2.
3.
4.
5.
W±1
7
8
10
10
10
12.5
Dimension(mm)
H±1
7
8
9
9
9
11.5
L±1.5
18
22
22
35
48
48
d±0.1
0.65
0.8
0.8
0.8
0.8
0.8
Resistance Range(Ω)
Wirewound
0.1~100
0.1~150
0.1~150
0.1~430
0.1~470
0.5~600
Power Film
101~10K
151~33K
151~50K
431~50K
471~50K
601~150K
Max Working
Voltage
150V
350V
350V
500V
750V
1000V
14
13.5
60
0.8
0.5~1K
1.1K~150K
1000V
Max Overload Voltage is 2 times of Max Working Voltage.
Too low or too high ohmic value can be supplied only case by case.
Max Working Voltage is applying for all SQ types.
Power Film means cutting resistance values instead of wound by resistance wires.
Non-Inductive types are also supplied.
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