2) Highly reliable chip resistor Ruthenium oxide dielectric offers superior resistance to the elements.
3) Electrodes not corroded by soldering
Thick film makes the electrodes very strong.
4) Leading the world in development and mass production.
Since start of production in 1976 (first in the wold), this component has established a solid reputation as a
general–purpose chip resistor.
5) ROHM resistors have approved ISO–9001 certification.
Design and specifications are subject to change without notice. Carefully check the specification sheet before using or
ordering it.
Ratings
Item
Rated power
Conditions
Power must be derated according to the power derating curve in
Figure 1 when ambient temperature exceeds 70
°
C.
100
80
60
40
20
0
Specifications
0.25W (1 / 4W)
at 70
°
C
POWER LOAD (%)
−55
0
70
100
155
AMBIENT TEMPERATURE
(°C)
Fig.1
Rated voltage
The voltage rating is calculated by the following equation.
If the value obtained exceeds the limiting element voltage,
the voltage rating is equal to the maximum operating voltage.
E: Rated voltage (V)
E= P×R
P: Rated power (W)
R: Nominal resistance (Ω)
Limiting element voltage
200V
Nominal resistance
Operating temperature
See Table 1.
−55
°
C
to
+155
°
C
Rev.B
1/5
MCR18
Resistors
Jumper type
Resistance
Rated current
Table 1
Max. 50mΩ
2A
Resistance tolerance
F (±1%)
J (±5%)
Resistance range
(Ω)
Resistance temperature coefficient
(ppm /
°C)
Operating temperature
−55°
C
to
+155°
C
10
≤
R
≤
2.2M (E24,96)
1.0
≤
R
<
2.2
2.2
≤
R
<
10
10
≤
R
≤
10M
(E24)
(E24)
(E24)
±100
500±350
±500
±200
Before using components in circuits where they will be exposed to transients such as pulse loads (short–duration, high–level loads), be certain to evaluate the
component in the mounted state. In addition, the reliability and performance of this component cannot be guaranteed if it is used with a steady state voltage that
is greater than its rated voltage.
Characteristics
Item
Resistance
Variation of resistance
with temperature
Overload
±
(2.0%+0.1Ω)
Guaranteed value
Resistor type
Jumper type
J :
±5%
F :
±1%
Max. 50mΩ
Test conditions (JIS C 5201-1)
JIS C 5201-1 4.5
JIS C 5201-1 4.8
Measurement :
−55
/
+25
/
+125°C
JIS C 5201-1 4.13
Rated voltage (current)
×2.5,
2s.
Maximum overload voltage : 400V
JIS C 5201-1 4.17
Rosin·Ethanol (25%WT)
Soldering condition : 235±5°C
Duration of immersion : 2.0±0.5s.
JIS C 5201-1 4.18
Soldering condition : 260±5°C
Duration of immersion : 10±1s.
JIS C 5201-1 4.19
Test temp. :
−55°C
to
+125°C
5cyc
JIS C 5201-1 4.24
40°C, 93%RH
Test time : 1,000h to 1,048h
JIS C 5201-1 4.25.1
Rated voltage (current), 70°C
1.5h : ON
−
0.5h : OFF
Test time : 1,000h to 1,048h
JIS C 5201-1 4.25.3
155°C
Test time : 1,000h to 1,048h
JIS C 5201-1 4.29
23±5°C, Immersion cleaning, 5±0.5min.
Solvent : 2-propanol
JIS C 5201-1 4.33
See Table.1
Max. 50mΩ
Solderability
A new uniform coating of minimum of
95% of the surface being immersed
and no soldering damage.
±
(1.0%+0.05Ω)
Max. 50mΩ
No remarkable abnormality on the appearance.
±
(1.0%+0.05Ω)
±
(3.0%+0.1Ω)
Max. 50mΩ
Max. 100mΩ
Resistance to
soldering heat
Rapid change of
temperature
Damp heat, steady state
±
(3.0%+0.1Ω)
Endurance at 70°C
±
(3.0%+0.1Ω)
Endurance
±
(1.0%+0.05Ω)
Resistance to solvent
Max. 100mΩ
Max. 100mΩ
Max. 50mΩ
Bend strength of
the end face plating
Max. 50mΩ
±
(1.0%+0.05Ω)
Without mechanical damage such as breaks.
Rev.B
2/5
MCR18
Resistors
External dimensions
(Unit : mm)
1
0.5±0.25
2
No.
1
Material
Resistive element (Oxide metal thick film)
Silver thick film electrode
Nickel electrode
Sn electrode
Alumina substrate
Overcoating
3
2
3
0.5±0.25
0.55±0.1
3.2±0.15
5
4
4
5
6
6
Packaging
Reel
Taping
P
0
P
2
P
2
φD
2
E
F
B
2
02
04
06
08
08
06
04
1.6±0.15
W
A
B
D
02
A
2
Heat crimp cover/Tape
Thick paper (Underside paper tape) Chip resistor Square punchout hole
当今的计算机外部设备，都在追求高速度和高通用性。为了满足用户的需求，以Intel为首的七家公司于1994年推出了USB（Universal Serial Bus，通用串行总线）总线协议，专用于低、中速的计算机外设。目前，USB端口已成为微机主板的标准端口；而在不久的将来，所有的微机外设，包括键盘、鼠标、显示器、打印机、数字相机、扫描仪和游戏柄等等，都将通过USB与主机相连。
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