Preliminary Specification
Preliminary Specification
SR20X, SR25X
±
1%,
±
5%
Power chip resistors
Size 2010, 2512
( Automotive & Anti-sulfuration )
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SR20-25X_V03
Oct.2010
Preliminary Specification
FEATURE
1. High reliability and stability ±1%
2. Sulfuration resistant 1000ppm
3. Automotive grade
4. Higher component and equipment reliability
5.
RoHS compliant Lead free products
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
extra protective metal film is added onto top side electrodes to protect termination from sulfuration.
The
composition of the paste is adjusted to give the approximate resistance required and the value is trimmed to
within tolerance by laser cutting 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. Construction of 2512, 2010 Chip-R
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Oct.2010
Preliminary Specification
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)
0.5 W
200V
400V
55/155/56
General Specification
SR20
2010 ( 5025 ),
SR25
2512(6432)
±5%
(E24);
±1%
(E24+E96)
1Ω ~ 10MΩ, Jumper (0Ω)
±
200 ppm/°C
±
100 ppm/°C
±
200 ppm/°C
1W
250V
500V
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
SR20X
1/2 W
Max. 50mR
3.2 A
8A
-55C ~ 155C
SR25X
1W
Max. 50mR
4.5 A
11 A
-55C ~ 155C
RCWV
=
Rated Power
×
Resistance Value
or Max. RCWV listed above, whichever is lower.
MECHANICAL DATA
(unit : mm)
TYPE
L
W
T
Tt
Tb
SR20
5.00±0.20
2.50±0.20
0.55±0.10
0.65±0.25
0.60±0.25
SR25
6.40±0.20
3.20±0.20
0.60±0.10
0.65±0.25
0.90±0.25
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SR20-25X_V03
Oct.2010
Preliminary Specification
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
±
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.2
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 245°C during 3 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 3.
Fig 3. Infrared soldering profile for Chip Resistors
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SR20-25X_V03
Oct.2010
Preliminary Specification
CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
SR25
Size code
SR25 : 2512
SR20 : 2010
X
Type code
X :
±5%:
1Ω - 10MΩ
±1%:
10Ω - 1MΩ
W:
±1%:
<10Ω; > 1MΩ
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)
F
Customer code
F = Anti-Sulfuration
test conditions:
ASTM B-809 FOS
test 60’C, 20 days
for F code definition
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: ASTM B-809 FOS test 60’C, 20 days
* 100% CCD visual inspection to guarantee visual quality !
TEST AND REQUIREMENTS (JIS C 5201-1 : 1998)
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
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
)
(ppm/°C)
t
1
: 20°
C+5°
C-1°
C
Refer to
“QUICK REFERENCE DATA”
N/a
R
1
: Resistance at reference temperature
R
2
: Resistance at test temperature
Short Time Overload 2.5 times RCWV or max. overload voltage, for 5seconds
Clause 4.13
Resistance to
soldering heat
(R.S.H)
Clause 4.18.2
Un-mounted chips completely immersed for 10±1second in a SAC
solder bath at 260℃±5ºC
±5%
:
∆R/R
max.
±(0.5%+0.05Ω)
±1%
:
∆R/R
max.
±(0.25%+0.05Ω)
±5%
:
∆R/R
max.
±(0.5%+0.05Ω)
±1%
:
∆R/R
max.
±(0.25%+0.05Ω)
No visible damage
<50mΩ
<50mΩ
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SR20-25X_V03
Oct.2010
