Products with gold plated electrodes are also available only 1J, 2A and
2B type (0.1Ω~10Ω, F:±1%, J:±5%), so please consult with us.
With type 1H, W2H and W3A, W3A2 only T is available as the terminal
surface material.
*3
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
1/21/22
122
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
SR73
lo-ohm 0.5%, 1%, 2%, 5% tolerance thick film
current sense resistor
applications and ratings
Part
Designation*
SR731H
(0201)
SR731E
(0402)
SR731J
(0603)
Power
Rating
0.1W
1/6W (.166W)
1/5W (.2W)
1/4W (.25W)
1/3W (.33W)
SR732A
(0805)
1/2W (.5W )
1
70°C
70°C
70°C
70°C
70°C
70°C
—
125°C
125°C
125°C
125°C
105°C
125°C
110°C
125°C
110°C
125°C
125°C
0 ~ +400
0 ~ +500
±200
±300
±500
±200
±200
±100
±200
±500
±800
±100
±200
±500
±800
±100
±200
±500
±800
±100
±200
±500
±800
±100
±200
±500
±1000
±100
±200
±500
±1000
±100
±200
±500
±800
±100
±200
±500
±800
—
—
—
—
—
—
0.15Ω -
—
—
—
0.15Ω -
—
—
—
0.15Ω -
—
—
—
0.15Ω -
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
10Ω
1Ω - 10Ω**
—
0.51Ω - 10Ω**
0.2Ω - 0.47Ω**
0.1Ω - 0.18Ω**
1.02Ω - 10Ω
0.1Ω - 1Ω
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
—
0.51Ω - 10Ω
0.2Ω - 0.47Ω
0.1Ω - 0.18Ω
1.1Ω - 10Ω
0.1Ω - 1Ω
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
—
0.1Ω - 10Ω
—
—
0.27Ω - 10Ω
0.18Ω - 0.24Ω
0.51Ω - 10Ω
0.2Ω - 0.47Ω
0.1Ω - 0.18Ω
1.1Ω - 10Ω
0.1Ω - 1Ω
—
0.1Ω - 10Ω
0.051Ω - 0.091Ω
0.030Ω - 0.047Ω
—
0.1Ω - 10Ω
0.051Ω - 0.091Ω
0.030Ω - 0.047Ω
—
0.1Ω - 10Ω
0.056Ω - 0.091Ω
0.030Ω - 0.051Ω
—
0.1Ω - 10Ω
0.056Ω - 0.091Ω
0.030Ω - 0.051Ω
—
0.047Ω - 10Ω
0.036Ω - 0.043Ω
0.024Ω - 0.033Ω
—
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
10Ω
10Ω
1/3W (.33W)
SR732B
(1206)
1/2W (.5W )
1
70°C
70°C
70°C
70°C
10Ω
1/2W (.5W)
SR732E
(1210)
2/3W (.66W
1
)
SR732H/W2H
(2010)
SR733A/W3A
(2512)
3/4W (.75W)
1W
70°C
70°C
* Parentheses indicate EIA package size codes.
** 1H, 1E (F: ±1%) E-24 values only.
Operating Temp: -55C to +125°C (SR731H only), -55°C to +150°C
If any questions should arise whether to use the “Rated Ambient Temperature” or the “Rated Terminal Part Temperature,” please give priority to the “Rated Terminal
Part Temperature.” Prior to use and for more details refer to “Introduction of the derating curves on the terminal part temperature” in the beginning of the catalog.
1
Prior to use, refer to the “Higher Power Ratings” in the beginning of catalog. Rated voltage =
√Power
rating x resistance value or max. working voltage, whichever is lower
environmental applications
Derating Curve
1E, 1J
2A
2B
2E
W2H, W3A
SR73 2A (0.5W), SR73 2B (0.5W), SR73 2E (0.66W)
For resistors operated at an ambient temperature
of 70°C or above, a power rating shall be derated
in accordance with the derating curve.
For resistors operated at a terminal part temperature of described for each size or above, a power rating shall be derated in
accordance with the derating curve.
Please refer to “Introduction of the derating curve based on the terminal part temperature” on the beginning of our catalog before use.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
10/07/20
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
123
current
sense
Rated
Ambient
Temp.
Rated
Terminal
Part Temp.
T.C.R.
(ppm/°C)
Max.
Resistance Range
E-24, E-96
(D±0.5%)
E-24, E-96
(F±1%)**
E-24
(G±2%)
E-24
(J±5%)
SR73
lo-ohm 0.5%, 1%, 2%, 5% tolerance thick film
current sense resistor
Temperature Rise
SR73 1E-1J
90
80
Temperature Rise (°C)
70
60
50
40
30
20
10
0
0
25
50
75
Power Rating
(%)
100
1E
1
SR73 2A-2E
140
120
Temperature Rise (°C)
1J (0.25W)
1E
2
1
SR73 2H-W3A
150
2B (0.5W)
2A (0.5W)
1
1
1
2E (0.66W)
Temperature Rise (°C)
One-Pulse Limiting Electric Power (W)
100
One-Pulse Limiting Electric Power (W)
current
sense
125
100
75
50
25
0
3
3A/W3A
2H/W2H
3A/W3A
2H/W2H
1
1
100
80
60
40
20
0
0
25 50
75
Power Rating
(%)
100
2B (0.5W)
2A (0.5W)
2
2
1J (0.25W)
2
2
2
2E (0.66W)
2
0
Measurement condition
Room temperature: 25°C
PCB: FR-4t = 1.6mm
Cu foil thickness: 35µm
①:
Hot spot
②:
Terminal
25 50 75
Power Rating
(%)
100
Regarding the temperature rise, the value of the temperature varies per conditions
and board for use since the temperature is measured under our measuring conditions.
One-Pulse Limiting Electric Power
SR73 1H-2A
1000
SR73 2B-W3A
10
100
1
2A
1J
1E
1H
10
3A/W3A
2H/W2H
2E
2B
0.1
.001
.01
.1
1
10
100
1000
1
.001
.01
.1
1
10
100
1000
Pulse Duration
(ms)
Pulse Duration
(ms)
The maximum applicable voltage is equal to the max.
overload voltage. Please contact factory for resistance
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