Tel : 82-32-817-4325 Resistors And
Fax : 82-32-817-4329 Resistive Applications
Website : http://www.raraohm.com Email : sg@raraohm.com 2-NOV-2018
MR 2512 / MR2818
Metal Alloy Low Resistance Chip Resistor (MR series)
- Low Resistance / TCR / Inductance
- Excellent long term stability
- RoHS compliant and halogen Free
- Lead Free
- High precision current sensing and voltage division
■ GENERAL SPECIFICATIONS
Model
Power
Rating
(@70
℃)
T.C.R
(ppm/
℃
)
Max
Rating
Current
Max
Overload
Current
Resistance
Range
(m
Ω
)
Tolerance
Material
MR2512
2W
±
50
22.36 50 4~100
1.0%(F)
2.0%(G)
5.0%(J)
4~10m
Ω
:MnCu
6~100m
Ω
:FeCrAl
3W 27.38 61.23 4~10
4~10m
Ω
:MnCu
MR2818 5W
±
200
27.38 70.71 4~5
4~5m
Ω
:MnCu
± 75 35.35 57.73 6~20
6~20m
Ω
:MnCu
■ CHARACTERISTICS
Test
Resistance
value
Test Method
Temperature Coefficient
t1=25±3℃, t2=125±3℃,
R1= resistance at 25℃, R2= resistance at 125℃
(ppm/℃)=
Short time OverLoad ±1%
MR2512-2W : 5 times of rated power, Duration : 5 Sec
MR2512-3W : 5 times of rated power, Duration : 5 Sec
MR2818-5W : 4 times of rated power, Duration : 5 Sec
High Temperature Exposure ±0.1%
1,000hrs at + 170℃
Soldering Heat ±0.5%
260±5℃ for 10 seconds
Load at Rated Power ±1%
1,000 hrs @ 70℃, 1.5 hrs “On” , 0.5hrs “OFF”
Dielectric Withstanding Voltage
Applied 500VAC for 1minute, and Limit surge current Max 50mA
Temperature Cycling ±1%
55°C to +150°C, 1,000cycles, 15min at each extreme
Bias Humidity ±1%
1,000hrs@+85°C/85%RH, 10%Bias 1.5hrs “ON”, 0.5hrs “OFF”
Solderability
>95%
coverage
245±5°C for 2±0.5secs
Core
Body Strength
No broken
Central part pressurizing force
：
5N , 10 seconds
Terminal Strength No broken
Pressurizing force
：
17.7N , 10 seconds
Terminal Bending Strength
±0.5%/
No broken
Bending once for 2mm , 10 seconds
Moisture Resistance
(Climatic Sequence)
±0.5%/
T=24 hours / Cycle ,10Cycles .
Steps 7a& 7b not required. Unpowered .(Figure 1)
Tel : 82-32-817-4325 Resistors And
Fax : 82-32-817-4329 Resistive Applications
Website : http://www.raraohm.com Email : sg@raraohm.com 2-NOV-2018
*
Figure 1 (Moisture Resistance)
*
Soldering Profile
50
100
150
200
250
Peak
：
250
℃
5
0
+
230
℃
or higher
Pre Heating Zone
180
℃
150
℃
90 ± 30 s
30 ± 10 s
Soldering Zone
Heating Time