MR18X, MR20X, MR25X
±
1%,
±
5%
Power chip resistors
Size 1218, 2010, 2512
( Automotive & Anti-sulfuration )
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FEATURE
1.
2.
3.
4.
High power rating and compact size
High reliability and stability
Reduced size of final equipment
RoHS compliant and Lead free product
APPLICATION
•
•
•
•
•
•
Power supply
Industry
Motor control
M/B Computer
Automotives
Servo
DESCRIPTION
The resistors are constructed in a high grade ceramic body (aluminum oxide). Internal metal electrodes are
added at each end and connected by a resistive paste that is applied to the top surface of the substrate. The
composition of the paste is adjusted to give the approximate resistance required and the value is trimmed to
nominated value within tolerance which controlled by laser trimming of this resistive layer.
The resistive layer is covered with a protective coat. Finally, the two external end terminations are added. For
ease of soldering the outer layer of these end terminations is a Tin (lead free) alloy.
Fig 1. Consctruction of 2512, 2010 Chip-R
Fig 2. Construction of 1218 Chip-R
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QUICK REFERENCE DATA
Item
Series No.
Size code
Resistance Tolerance
Resistance Range
TCR (ppm/°C)
< 10Ω
10Ω ~ 1MΩ
> 1MΩ
Max. dissipation at T
amb
=70°C
Max. Operation Voltage (DC or RMS)
Max. Overload Voltage (DC or RMS)
Climatic category (IEC 60068)
±
200 ppm/°C
±
100 ppm/°C
±
200 ppm/°C
1W
200V
400V
MR18
1218(3248)
General Specification
MR20
2010 ( 5025 ),
±5%
(E24);
±1%
(E24+E96)
1Ω ~ 10MΩ, Jumper (0Ω)
±
200 ppm/°C
±
100 ppm/°C
±
200 ppm/°C
0.5 W
200V
400V
55/125/56
±
200 ppm/°C
±
100 ppm/°C
±
200 ppm/°C
1W
250V
500V
MR25
2512(6432)
Test conditions for jumper ( 0 ohm )
Type
Power Rating At 70C
Resistance
Rated Current
Peak Current
Operating Temperature
Note :
1.
2.
This is the maximum voltage that may be continuously supplied to the resistor element, see “IEC publication
60115-8”
Max. Operation Voltage : So called RCWV (Rated Continuous Working Voltage) is determined by
MR18X
1W
Max. 50mR
4.5 A
11 A
MR20X
1/2 W
Max. 50mR
3.2 A
8A
-55C ~ 125℃
MR25X
1W
Max. 50mR
4.5 A
11 A
RCWV
=
Rated Power
×
Resistance Value
or Max. RCWV listed above, whichever is lower.
MECHANICAL DATA (unit : mm)
TYPE
L
W
T
Tt
Tb
MR18
3.05±0.15
4.60±0.20
0.55±0.10
0.45±0.25
0.50±0.25
MR20
5.00±0.20
2.50±0.20
0.55±0.10
0.65±0.25
0.60±0.25
MR25
6.40±0.20
3.20±0.20
0.60±0.10
0.65±0.25
0.90±0.25
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MARKING
Each resistor is marked with a four-digit code on the protective coating to designate the nominal resistance
value
±
5%,
±
1% tolerance !
Size
2512, 2010, 1218
±
5%
±
1%
4-digits marking
4-digits marking
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the E96 & E24 series for resistors with a tolerance of
±5%
&
±1%.
The values of the E24/E96 series are in accordance with “IEC publication 60063”.
Derating curve
The power that the resistor can dissipate depends on the operating temperature; see Fig.3
Fig 3
Maximum dissipation in percentage of rated power as a
function of the ambient temperature
MOUNTING
Due to their rectangular shapes and small tolerances, Surface Mountable Resistors are suitable for handling by
automatic placement systems. Chip placement can be on ceramic substrates and printed-circuit boards (PCBs).
Electrical connection to the circuit is by individual soldering condition. The end terminations guarantee a reliable
contact.
SOLDERING CONDITION
The robust construction of chip resistors allows them to be
completely immersed in a solder bath of 260°C for 10
seconds. Therefore, it is possible to mount Surface Mount
Resistors on one side of a PCB and other discrete
components on the reverse (mixed PCBs).
Surface Mount Resistors are tested for solderability at
235°C during 2 seconds. The test condition for no leaching
is 260°C for 30 seconds. Typical examples of soldering
processes that provide reliable joints without any damage
are given in Fig 4.
Fig 4. Infrared soldering profile for Chip Resistors
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CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
MR25
Size code
MR25 : 2512
MR20 : 2010
MR18 : 1218
X
Type code
X : Normal
472_
Resistance code
E24: 2 significant digits followed by
no. of zeros
100Ω
10KΩ
= 101_
= 103
J
Tolerance
F :
±1%
J :
±5%
P : Jumper
T
Packaging code
T
: 7” Reeled taping
L
Termination
code
L
=
Sn base
(lead free)
Q : 10” Reeled taping
G : 13” Reeled taping
B
: Bulk
E96 : 3 significant digits followed
by no. of zeros
102Ω
37.4KΩ
=1020
=3742
* Anti-Sulfuration test conditions: H2S 3ppm, 40’C, RH 90%, 1000hrs, criteria: +/-1% !
* 100% CCD visual inspection to guarantee visual quality !
TEST AND REQUIREMENTS
Essentially all tests are carried out according to the schedule of IEC publication 115-8, category
LCT/UCT/56(rated
temperature range :
Lower Category Temperature, Upper Category Temperature;
damp
heat, long term, 56 days). The testing also meets the requirements specified by EIA, EIAJ and JIS.
The tests are carried out in accordance with IEC publication 68, "Recommended basic climatic and mechanical
robustness testing procedure for electronic components" and under standard atmospheric conditions according
to IEC 60068-1, subclause 5.3. Unless otherwise specified, the following value supplied :
Temperature: 15°C to 35°C.
Relative humidity: 45% to 75%.
Air pressure: 86kPa to 106 kPa (860 mbar to 1060 mbar).
All soldering tests are performed with midly activated flux.
TEST
Electrical
Characteristics
AEC-Q200
Temperature
Coefficient of
Resistance(T.C.R)
JISC5201-1: 1998
Clause 4.8
PROCEDURE / TEST METHOD
DC resistance values measured at the test voltages specified below :
<10Ω@0.1V,
<10KΩ@3V,
<100Ω@0.3V, <1KΩ@1.0V,
<100KΩ@10V, <1MΩ@25V, <10MΩ@30V
Refer to
REQUIREMENT
Resistor
Within the specified tolerance
0Ω
Ω
<50mΩ
Natural resistance change per change in degree centigrade.
R
2
−
R
1
×
10
6
R
1
(
t
2
−
t
1
)
“QUICK REFERENCE DATA”
(ppm/°C)
t
1
: 20°
C+5°
C-1°
C
N/a
R
1
: Resistance at reference temperature
R
2
: Resistance at test temperature
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