Approval sheet
SR20X, SR25X
±
1%,
±
5%
Power chip resistors
Size 2010, 2512
( Automotive & Anti-sulfuration )
Page 1 of 8
SR20-25X_V04
Jan - 2013
Approval sheet
FEATURE
1. High reliability and stability ±1%
2. Sulfuration resistant ASTM B-809-95 compliant
3. Automotive grade AEC Q-200 Compliant
4. Higher component and equipment reliability
5.
RoHS compliant Lead free products
APPLICATION
•
•
•
•
•
Power supply
Industry
Motor control
M/B Computer
Automotives
Server
•
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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SR20-25X_V04
Jan - 2013
Approval sheet
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)
Operation temperature
0.5 W
200V
400V
-55 ~ +155’C
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
Page 3 of 8
SR20-25X_V04
Jan - 2013
Approval sheet
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
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 3.
Page 4 of 8
SR20-25X_V04
Jan - 2013
Approval sheet
Fig 3. Infrared soldering profile for Chip Resistors
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)
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-809-95 60’C, 480hrs! Acceptance criteria +/-1%!
* 100% CCD visual inspection to guarantee visual quality.
Page 5 of 8
SR20-25X_V04
Jan - 2013
PCB设计
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