k_
KDA SPEER ELECTRONICS. INC.
10-51% 10-51%
WK73R
wide terminal type flat chip resistors
environmental applications
Maximum
Working
Voltage
F±1%
E-24/E-96 J±5%
E-24
Part
Designation
Maximum
Overload
Voltage
Operating
Temp.
Range
Power
Rating
WK73R2H 432k - 1M 200V 400V
200V 400V
200V 400V
1.0W
±200
Resistance Range (Ω)
T.C.R.
(X 10-6/K)
-55°C
to
+155°C
10 - 430k
±100
WK73R2J
200V 400V
Rated
Terminal
Part Temp.
125°C
Rated
Ambient
Temp.
70°C
100°C70°C
125°C70°C
115°C70°C
125°C70°C
2.0W1
511k - 1M
10 - 510k
10 - 330k
332k - 1M
470k - 1M
10 - 430k
560k - 1M
10 - 510k
10 - 330k
360k - 1M
±200
±100
±100
±200
Performance Characteristics
Parameter
Requirement ∆ R ±(%+0.005Ω)
Limit Typical Test Method
Resistance
T.C.R.
25°C
+25°C/-55°C and +25°C/+125°C
Within specified
tolerance
Within specified
T.C.R.
—
—
Overload (Short time)
WK73R1E (0.33W), WK73R1J (0.5W), WK73R2A (0.75W, 1W)WK73R3A (2W): Rated
voltage x2.0 for 5 seconds. WK73R2B, R2H, R2J, R3A: Rated voltage x2.5 for 3 seconds
±2% ±0.2%
Resistance to Solder Heat 260°C ± 5°C, 10 seconds ± 1 second
±1% ±0.2%
Bending Test Holding point 90mm, Bending 1 time, Bending 5mm
±1% ±0.1%
Rapid Change of Temperature -55°C (30 minutes), +125°C (30 minutes), 100 cycles
±0.5% ±0.3%
Moisture Resistance 40°C ± 2°C, 90%-95% RH, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
±3%: 1E
±2%: All others ±1%: 1E
±0.2%: All others
Endurance at 70°C 70°C ± 2°C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
±3%: 1E
±2%: All others ±1%: 1E
±0.2%: All others
High Temperature Exposure +155°C, 1000 hours
±1% ±0.2%
1.0W
applications and ratings
10 - 1M
±100 10 - 1M
WK73R2B
D±0.5%
E-24/E-96
10 - 1M
Additional environmental applications can also be found at www.koaspeer.com
0.75W
150V 200V
125°C
70°C 10 - 1M±100 10 - 1M
WK73R1J ––
0.5W1
—
—
—
—
—
WK73R3A
1.5W 10 - 330k
332k - 1M
10 - 330k
360k - 1M
±100
±200
—
—
—
Rated voltage = √Power rating x resistance value or max. working voltage, whichever is lower
1 If you want to use at rated power use derating curves based on the terminal part temperature on the right side graph located on previous page.
If any questions arise whether to use the “Rated Ambient Temperature” or the “Rated Terminal Part Temperature”, please give priority to the
“Rated Terminal Part Temperature.” For more details refer to the “Introduction of the derating curves based on the terminal part temperature”
in the beginning of the catalog
115°C70°C 10 - 9.76k
±100 10 - 9.1k
10 - 9.76k
1.0W1
200V 400V
125°C70°C 20.5k - 1M
±100 22k - 1M
WK73R2A ––
0.75W1
125°C70°C 10 - 20k
±100 10 - 20k
––
1.0W1
75V 100V125°C70°C 10 -1M
±100 10 - 1M
WK73R1E ––
0.33W1
32 KOA Speer Electronics, Inc. • 199 Bolivar Drive • 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. 12/10/20
resistors
Temperature Rise One-Pulse Limiting Electric Power
One-Pulse Limiting Electric Power (W)
100
0.1
.1100
0.01
Pulse Duration
(ms)
10001.001
10
1
10.01
2A
1J
1E
One-Pulse Limiting Electric Power (W)
1000
.1100
1
10001.001
100
10
10.01
3A
2H/2J
2B
(10-3.3kΩ)
2B
(3.6k-1MΩ)
Temperature Rise (°C)
100
80
60
40
20
10708040
090
20100305060
Power Rating
(%)
1J
1E
1J
1E
Temperature Rise (°C)
140
80
60
40
20
10 70 8040
090
20 100305060
Power Rating
(%)
100
120 2A
2B
2A
2B
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.
The maximum applicable voltage is equal to the max. overload
voltage. Please ask us about the resistance characteristic of
continuous applied pulse. The pulse endurance values are not
assured values, so be sure to check the products on actual
equipment when you use them.
Temperature Rise (°C)
140
80
60
40
20
10 70 8040
090
20100305060
Power Rating
(%)
100
120 3A
2H/2J
3A
2H/2J
②: Terminal
①: Hot spot
Measurement condition
Room temperature: 25°C
PCB: FR-4t = 1.6mm
Cu foil thickness: 35µm
WK73R 1E-1J WK73R 2A-2B
WK73R 2H-3A
WK73R 1E-2A WK73R 2B-3A