3) Electrodes not corroded by soldering Thick film makes
the electrodes very strong.
4) Leading the world in development and mass produc-
tion.
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 certifica-
tion.
Design and specifications are subject to change with-
out notice. Carefully check the specification sheet be-
fore 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 maximum operating 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)
Nominal resistance
Operating temperature
See Table 1.
−55
°
C
to + 155
°
C
Max. intermittent overload voltage
400V
Max. operating voltage
200V
Max. overload voltage
400V
MCR18
Resistors
Jumper type
Resistance
Rated current
Peak current
Max. 50mΩ
2A
10A
F ( ± 1%)
Table 1
Resistance tolerance
Resistance range
(Ω)
10
≤
R
≤
2.2M
1.0
≤
R
<
2.2
J ( ± 5%)
2.2
≤
R
<
10
10
≤
R
≤
10M
(E24,96)
(E24)
(E24)
(E24)
Resistance temperature coefficient
(ppm /
°C)
± 100
500 ± 350
± 500
± 200
Operating temperature
−55°
C
to + 155
°
C
!
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.
MCR18
Resistors
!Characteristics
Characteristics
DC resistance
Resistance temperature
characteristics
Short time overload
± (2.0% + 0.1Ω)
Specifications
Chip resistance
Jumper type
F: ± 1%
J: ± 5%
Max. 50mΩ
Test method
JIS C 5202 5.1
Applied voltage: A
JIS C 5202 5.2
Test conditions: + 25 /
−55
/ + 25 / + 125°C
JIS C 5202 5.5
Rated voltage (current):
×
2.5, 5s.
Maximum overload voltage: 400V
JIS C 5202 5.6
Test voltage: 100V, 1min.
Assembled state
Metal block
observation
point A
Insulation plate
See Table 1.
Max. 50mΩ
Min. 1,000MΩ between terminal and board
Insulation resistance
Test resistor
Metal plate
Observation Insulation
sheath
R 0.5
point B
Spring-loaded
pressure
Withstand voltage
Do not damage insulation or cause a short circuit.
JIS C 5202 5.7
Test voltage: 500V
JIS C 5202 5.8
Rated voltage (current):
×
2.5
(1s: ON
−
25s: OFF)
×
10,000cyc.
JIS C 5202 6.1
JIS C 5202 6.4
Soldering conditions: 260 ± 5°C
Soldering time: 10 ± 1s.
JIS C 5202 6.5
Rosin methanol: (25%WT)
Soldering conditions: 235 ± 5°C
Soldering time: 2.0 ± 0.5s.
JIS C 5202 7.2
155°C
Test time: 1,000 to 1,048 hrs.
JIS C 5202 7.10
Rated voltage (current), 70°C
1.5h: ON
−
0.5h: OFF
Test time: 1,000 to 1,048 hrs.
JIS C 5202 7.9
Rated voltage (current), 60°C, 95%RH
1.5h: ON
−0.5h:
OFF
Test time: 1,000 to 1,048 hrs.
JIS C 5202 7.5
85°C, 85%RH
Test time: 1,000 to 1,048 hrs.
JIS C 5202 7.4
Test temperature:
−55°C
to + 125°C 100cyc.
JIS C 5202 6.9
Room temperature, static immersion, 1 min.
Solvent: Isopropyl alcohol
Intermittent overload
Terminal strength
(against bending of circuit board)
Resistance to soldering heat
± (5.0% + 0.1Ω)
Max. 50mΩ
± (1.0% + 0.05Ω)
Max. 50mΩ
There must be no mechanical damage.
± (1.0% + 0.05Ω)
Max. 50mΩ
Outside must not be noticeably damaged.
95% of terminal surface must be covered by
new soldering, and there must be
no soldering corrosion.
Solderability
Resistance to dry heat
± (3.0% +0.1Ω)
Max. 100mΩ
Endurance
(rated load)
± (3.0% +0.1Ω)
Max. 100mΩ
Endurance
(under load in damp environment)
± (3.0% +0.1Ω)
Max. 100mΩ
Resistance to humidity
(steady state)
± (3.0% +0.1Ω)
Max. 100mΩ
Temperature cycling
± (1.0% +0.05Ω)
Max. 50mΩ
Resistance to solvents
± (0.5% +0.05Ω)
Max. 50mΩ
Markings must not be dissolved away.
MCR18
Resistors
!External
dimensions
(Units: mm)
0.5 ± 0.25
No.
Material
Thick dielectric glaze of ruthenium (only silver used for jumper)
Thick film of palladium-silver for primary electrode
3.2 ± 0.15
0.55 ± 0.1
0.5 ± 0.25
Nickel-coated secondary electrode
External electrode coated with tin and lead
Alumina substrate
Overcoating
!Packaging
Reel
Taping
P
0
P
2
P
2
φD
2
E
F
B
2
08
06
04
02
02
04
06
08
1.6 ± 0.15
W
A
B
D
A
2
Heat crimp cover/Tape
Thick paper (Underside paper tape) Chip resistor Square punchout hole
在编译OAL的过程中遇见don't know how to make的错误和Missing source file的警告，如下：
错误：
BUILD: NMAKE : U1073: don't know how to make 'D:\WINCE600\platform\smdk2440a\lib\ARM ......
微控制器 MCU
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