KOA SPEER ELECTRONICS, INC.
SS-239 R4
AHA 12/05/07
Low Resistance Flat Chip Resistors
Type SR73
1. Scope
This specification applies to chip resistors (SR73) produced by KOA Corporation.
2. Type Designation
The type designation shall be in the following form:
CERTIFIED
CERTIFIED
SR73
Size
2B
Size
1E
1J
2A
2B
2E
2H
3A
T
Termination
Material
T: Sn
(Other termination
styles may be
available, please
contact factory
for options)
TD
Packaging
TP: 2mm Pitch Punched
Paper Tape
(0402, 0603 & 0805)
TD: 7" Paper Tape
(0603, 0805, 1206 & 1210)
TDD: 10" Paper Tape
(0603, 0805, 1206 &1210)
TE: 7" Punched Plastic
(0805, 1206, 1210,
2010 & 2512)
TED: 10" Punched Plastic
(0805, 1206, 1210,
2010 & 2512)
1R00
Nominal
Resistance
±2%, ±5%: 2 significant figures +
1 multiplier “R” indicates decimal
on value <10Ω
±1%: 3 significant figures + 1
multiplier “R” indicates decimal
on value <100Ω
All values less than 0.1Ω (100mΩ)
are expressed in mΩ with “L” as
decimal Example: 20mΩ = 20L0
F
Tolerance
D: ±0.5%
F: ±1%
G: ±2%
J: ±5%
3. Dimensions and Structure
3-1 Dimensions
c
L
c
Type
(Inch Size Code)
L
.039
+.004
-.002
(1.0
+0.1
-0.05
)
Dimensions
inches (mm)
W
c
d
.02
+.004
-.002
(0.5
+0.1
-0.05
)
t
1E
(0402)
1J
(0603)
2A
(0805)
2B
(1206)
2E
(1210)
2H
(2010)
3A
(2512)
.01±.004 .01±.004 .014±.002
(0.25±0.1) (0.25±0.1) (0.35±0.05)
W
Solder
Plating
t
d
Protective
Coating
Resistive Inner
Film
Electrode
Ni
Plating
+.006
.063±.008 .031
-.004
.014±.004 .014±.004 .018±.004
(1.6±0.2) (0.8
+0.15
) (0.35±0.1) (0.35±0.1) (0.45±0.1)
-0.1
.079±.008 .049±.004 .016±.008
(2.0±0.2) (1.25±0.1) (0.4±0.2)
.063±.008
.126±.008 (1.6±0.2)
(3.2±0.2) .102±.008
(2.6±0.2)
.197±.008 .098±.008
(5.0±0.2) (2.5±0.2)
.248±.008 .122±.008
(6.3±0.2) (3.1±0.2)
.012
+.008
-.004
(0.3
+0.2
-0.1
)
.02±.004
(0.5±0.1)
Ceramic
Substrate
.016
+.008
-.004
.02±.012
(0.5±0.3)
(0.4
+0.2
)
-0.1
.024±.004
(0.6±0.1)
.025±.005
(0.65±0.15)
PAGE 1 OF 8
Bolivar Drive
■
P.O. Box 547
■
Bradford, PA 16701
■
USA
■
814-362-5536
■
Fax 814-362-8883
■
www.koaspeer.com
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
KOA SPEER ELECTRONICS, INC.
SS-239 R4
4. Standard Applications
Part
Designation*
SR731E
(0402)
SR731J
(0603)
SR732A
(0805)
SR732B
(1206)
SR732E
(1210)
SR732H
(2010)
SR733A
(2512)
Power
Rating
@ 70°C
1/8W (.125W)
1/6W (.166W
2
)
1/5W (.2W)
1/4W (.25W)
1/3W (.33W
2
)
1/3W (.33W)
1/2W (.5W
2
)
1/2W (.5W)
2/3W (.66W
2
)
3/4W (.75W)
1W
T.C.R.
(ppm/°C)
Max.
±200
±300
±500
±200
±100
±200
±500
±800
±100
±200
±500
±800
±100
±200
±500
±1000
±100
±200
±500
±800
±100
±200
±500
±800
Resistance Range**
E-24, E-96 E-24, E-96
(D±0.5%)
(F±1%)
—
—
—
—
0.15Ω - 10Ω
—
—
—
0.15Ω - 10Ω
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0.51Ω - 10Ω***
0.2Ω - 0.47Ω***
0.1Ω - 0.18Ω***
0.1Ω - 10Ω
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
E-24
(G±2%)
0.51Ω - 10Ω
0.2Ω - 0.47Ω
0.1Ω - 0.18Ω
0.1Ω - 10Ω
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
E-24
(J±5%)
0.51Ω - 10Ω
0.2Ω - 0.47Ω
0.1Ω - 0.18Ω
0.1Ω - 10Ω
—
0.1Ω - 10Ω
0.051Ω - 0.091Ω
0.030Ω - 0.047Ω
—
0.1Ω - 10Ω
0.056Ω - 0.091Ω
0.030Ω - 0.051Ω
—
0.047Ω - 10Ω
0.036Ω - 0.043Ω
0.024Ω - 0.033Ω
—
0.1Ω - 10Ω
0.056Ω - 0.091Ω
0.033Ω - 0.051Ω
—
0.1Ω - 10Ω
0.056Ω - 0.091Ω
0.039Ω - 0.051Ω
Absolute
Maximum
Working
Voltage
1.11V
1.41V
1.58V
1.81V
2.23V
2.73V
3.16V
Maximum
Operating
Overload
Temperature
Voltage
Range
(5 Secs. Max.)
2.79V
3.53V
3.95V
4.54V
5.59V
6.84V
7.90V
-55°C
to
+150°C
* Parenthesis indicate EIA package size codes.
** See Appendix D for available decade values.
1
Power Rating for SR731E 0.91Ω - 10Ω = 1/10 (0.1W)
2
Please contact factory for limitation of Surface Mount Temp. Rise
*** 1E (F: ±1%) E-24 values only.
5. Rating
5-1 Rating
For temperature in excess of 70°C,
the load shall be derated in accordance
with the following figure.
Derating Curve
100
80
% Rated Power
60
40
20
1E
Surface Temperature Rise
180
160
Temperature Rise
(°C)
140
120
100
80
60
40
20
0
0
25
50
75
100
W2H (.75W)
2E (.66W)
2B (.5W)
2A (.33W)
2E (.5W)
2B (.33W)
2A (.25W)
1E (.166W)
1J (.2W)
1E (.125W)
W3A (1W)
1J, 2A, 2B,
2E, 2H, 3A
Measuring Point
0
-60 -40 -20
-55
0
80 100 120 140 160
70
150 155
Ambient Temperature
(°C)
40
60
20
% Rated Power
PAGE 2 OF 8
Bolivar Drive
■
P.O. Box 547
■
Bradford, PA 16701
■
USA
■
814-362-5536
■
Fax 814-362-8883
■
www.koaspeer.com
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
KOA SPEER ELECTRONICS, INC.
SS-239 R4
5-2 Voltage Rating
Resistors shall have a rated direct-current (DC)
continuous working voltage or approximate
sine-wave root-mean-square (RMS) continuous
working voltage at commercial-line frequency
and waveform corresponding to the power rating,
as determined from the following formula:
Where:
E = Rated voltage (V)
P x R P = Rated power (W)
R = Nominal resistance (Ω)
E=
√
In no case shall be rated DC or R.M.S. continuous
working voltage be greater than the applicable
maximum value.
6. Body and Marking
Type
SR73
SR73
Tolerance
D (±0.5%)
F (±1%)
G (±2%)
J (±5%)
Coating
Color
Indigo
Indigo
Marking
Color
White/ 4 digit
White/ 3 digit
Marking: a effective number and a multiplier. R means a decimal point.
7. Marking Method
D, F
4 digit
This character indicate
Ω
unit and
express 4 effective numbers.
R means a decimal point.
This character indicate
Ω
unit and
express 3 effective numbers.
R means a decimal point.
3 Digit
4 Digit
R20
0.2
Ω
R200
G, J
3 digit
4R7
4.7
Ω
4R70
PAGE 3 OF 8
Bolivar Drive
■
P.O. Box 547
■
Bradford, PA 16701
■
USA
■
814-362-5536
■
Fax 814-362-8883
■
www.koaspeer.com
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
KOA SPEER ELECTRONICS, INC.
SS-239 R4
8. Characteristics
8-1 Mechanical Characteristics
Item
Withstanding
Soldering Heat
Solderability
Requirement
No visual damage
± 1.0%
More than 95% of the surface of the termination
must be covered new solder
± 1.0%
Test Methods (JIS C 5202)
6.10
260°C ± 5°C
10 ± 1 sec.
6.11
230°C ± 5°C
3 ± 0.5 sec.
6.1.4
1) Bending
2A, 2B
Circuit board bending 5mm
Circuit board bending 2mm
Termination Strength
2) Shear
3) Pull-off strength
Vibration
Withstanding Solvent
± 0.5%
No visual & mechanical damage
6.3 Condition A
Each direction / 2hrs
1)
4.2 and 4.9
2)
MIL-STD-202F
Test method 215
8-2 Electrical Characteristics
Item
Resistance
Resistance of
Temperature Coefficient
Short Time Overload
Intermittent Overload
Insulation
Requirement
Within tolerance
Within specified R.T.C
-55°C/125°C
± 2.0%
± 5.0%
Above 10
4
MΩ
Test Methods (JIS C 5202)
5.1
Measuring Voltage A, 25 °C
5.2 Condition B
5.5 Condition A
5.8
Applied Voltage:
RV x 2.5
5.5
500V DC
The following sketch:
\
PAGE 4 OF 8
Bolivar Drive
■
P.O. Box 547
■
Bradford, PA 16701
■
USA
■
814-362-5536
■
Fax 814-362-8883
■
www.koaspeer.com
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
KOA SPEER ELECTRONICS, INC.
SS-239 R4
8-2 Electrical Characteristics (Continued)
Item
Insulation
Requirement
Above 10
3
MΩ
Test Methods (JIS C 5202)
5.6
500V DC
The following sketch:
\
Withstanding Voltage
± 0.5%
500V DC
60 ± 10/0 sec.
The following sketch:
5.7
\
Temperature Rise
(Rated Load)
1) Surface temp. rise: 100°C≥
2)
ΔR
± 0.5%
5.4
1) Test board
90mm x 10mm x 1.6mm
2) Recommended land dimensions
8-3 Environmental Characteristics
Item
Thermal Shock
(Air to Air)
High Temperature
Exposure
Load Life in Humidity
Requirement
± 1.0%
Test Methods (JIS C 5202)
-40°C 30 minutes
125°C 30 minutes
100 cycles
7.2
125 ± 3°C
1000 hrs.
7.9
40 ± 2°C
90 ~ 95% RH
1000 hrs.
7.10
70 ± 3°C
1000 hrs.
± 1.0%
± 2.0%
Load Life
± 2.0%
PAGE 5 OF 8
Bolivar Drive
■
P.O. Box 547
■
Bradford, PA 16701
■
USA
■
814-362-5536
■
Fax 814-362-8883
■
www.koaspeer.com
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
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