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1/2W 3720 LOW RESISTANCE CHIP RESISTOR
1. Scope
This specification applies to 3.75mm x 2.0mm size 1/2W, fixed metal film chip
resistors rectangular type for use in electronic equipment.
2. Type Designation
RL3720
-
-
(1)
(2)
(3)
(4)
Where (1) Series No.
(2) Temperature coefficient of resistanceT.C.R.
(3) Resistance value: refer to paragraph 4-1
For example--
Three digits of number ( R0.1
Ω)
R10 = 0.1
Ω
Four digits of numberR< 0.1
Ω
R022 = 0.022
Ω
The “R” shall be used as a decimal point.
(4) Resistance tolerance: refer to paragraph 4-1.
3. Construction and Physical Dimensions
W
a
a
Code Dimensions(mm)
Letter
3720
L
L
3.75
0.3
2.00
0.2
0.40
0.1
0.40
0.2
0.40
0.2
W
t
a
t
b
b
Figure 1. Construction and Dimensions
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4. Ratings
4-1 Specification
Power Rating*
Resistance Value
Resistance Tolerance
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1/2 W
0.02Ω2.2Ω
1%(F) ,
2%(G)
Note*:
Power Rating is based on continuous full load operation at rated ambient
temperature of 70°C. For resistors operated at ambient temperature in
excess of 70°C, the maximum load shall be derated in accordance with the
following curve.
Rated
dissipation
ratio
Ambient temperature
°
Figure 2 Derating Curve
4-2 Rated Voltage
The rated voltage shall be determined by the following expression.
=
×
Where VRated voltage (V)
RNominal resistance value (Ω)
PRated dissipation (W)
4-3 Operating and Storage Temperature Range
-55 to +125°C
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5. Characteristics
5-1 Electrical
5-1-1 Resistance
Resistance value shall be within the tolerance specified
in paragraph 4-1
Refer to JIS C 5202 5.1
5-1-2 Temperature Coefficient of Resistance
Not exceed the temperature coefficient of resistance
specified in paragraph 4-1
Room temperature
→
Room temperature + 100
Refer to JIS C 5202 5.2
5-1-3 Short Time Overload
Resistance Change :
(0.5%)
Without significant damage by flashover (spark , arching),burning
or breakdown etc.
Test voltage : 2.5 times the rated voltage.
Duration : 5 seconds
Refer to JIS C 5202 5.5
5-1-4 Insulation Resistance
(1) Between Electrode and Protection Film
100MΩ or over
(2) Between Electrode and Substrate
1,000MΩ or over
The resistor shall be cramped in the metal block and tested ,
as shown below.
Test voltage : 100V
DC
for 1 minute
Refer to JIS 5202 5.6 Mounting condition G.
Insulation Prate
Pressure Rod
(Metal)
Measurement Point A
Substrate
Protection Film
Spring
R0.5
Test Sample
Metal Block
Measurement Point B
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5-1-5 Voltage Proof
Resistance Change :
(0.5%)
Without damage by flashover, fire or breakdown, as shown below.
The resistor shall be tested as shown in paragraph 5-1-4
The voltage : 100V
AC
(rms.) for 1 minute
Refer to JIS C 5202 5.7
5-1-6 Intermittent Overload
When the resistance tolerance is
1.0% and
2.0%,
the resistance Change is
(1.0%).
When the resistance tolerance is
5.0%,
the resistance Change is
(5.0%).
DC voltage of 3.0 times the rated voltage for 1 second with
pause of 25 seconds.
10,000
200 cycles
Refer to JIS C 5202 5.8
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5-2 Mechanical
5-2-1 Terminal Strength
Resistance Change :
(0.5%)
Without mechanical damage such as breaks.
Electrical characteristics shall be satisfied.
If there are electrodes on both surfaces, it shall satisfy the above
specifications on whichever surface may be fixated.
Bending Amplitude : 3 mm 30 seconds
Refer to JIS C 5202 6.1.4.
Pressure
20
Press Jig
R230
50
Amplitude
3 mm
Test PC Board
Sample
Refer to EIAJ RC-2530
Solder
Supports
Within
2mm
45
45
Unit : mm
5-2-2 Body Strength
Resistance Change :
(0.5%)
Without mechanical damage such as breaks.
A load of 10N using a R0.5 pressure rod shall be applied to the center
in the direction of the arrow and held for 10 seconds.
Refer to JIS C 5202 6.2
Pressure rod
R0.5
Resistor
1/2L
L
Unit : mm
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