wide terminal type flat chip resistors
(anti sulfuration)
EU
features
•
Anti-sulfuration type, wide-side termination
(reverse-geometry)type flat chip resistor
•
Excellent anti-sulfuration characteristic due to using
high sulfuration-proof inner top electrode material
•
Suitable for both flow and reflow solderings
•
Products meet EU RoHS requirements.
EU RoHS regulation is not intended for Pb-glass
contained in electrode, resistor element and glass.
•
AEC-Q200 Tested
Type
dimensions and construction
L
c
c
(Inch Size Code)
L
Dimensions
inches
(mm)
W
c
d
t
2A
(0508)
2B
(0612)
.049±.006 .079±.006 .012±.008 .014±.008 .022±.004
(1.25±0.15) (2.0±0.15) (0.3±0.2) (0.35±0.2) (0.55±0.1)
.063±
-.008
.126±
-.012
.012±.008 .018±.006
+0.1
+0.1
(0.3±0.2) (0.45±0.15)
(1.6±
-0.2
) (3.2±
-0.3
)
.024±.004
(0.6±0.1)
+.004
+.004
.098±
-.008
.197±
-.008
.016±.008 .030±.006
+0.1
+0.1
(0.4±0.2) (0.75±0.15)
(2.5±
-0.2
) (5.0±
-0.2
)
.122±
-.008
.181±
-.008
.016±.008 .030±.006
+0.1
+0.1
(0.4±0.2) (0.75±0.15)
(3.1±
-0.2
) (4.6±
-0.2
)
.024±.004
(0.6±0.1)
+.008
.122±
-.004
.248±.006 .018±.008 .030±.006
+0.2
(6.3±0.15) (0.45±0.2) (0.75±0.15)
(3.1±
-0.1
)
WK73S/R2B (1W), WK73S/R3A (2W)
+.004
+.004
+.004
+.004
W
Ceramic Substrate
Sn Plating
2H
(1020)
2J
(1218)
3A
(1225)
t
d
Ni Plating
Protective Resistive Inner
Electrode
Coating Film
Derating Curve
100
80
% Rated Power
% Rated Power
100
80
60
2A, 2B, 2H, 3A (125°C)
40
20
0
-60 -40 -20
-55
2J (100°C)
100
80
% Rated Power
60
2B, 3A (115°C)
40
20
0
-60 -40 -20
-55
60
40
20
0
-60 -40 -20
-55
0
80 100 120 140 160
155
70
Ambient Temperature
(°C)
20
40
60
0
80 100 120 140 160
125
155
Terminal Part Temperature
(°C)
20
40
60
0
20
40
60
80 100
120 140 160
115
155
Terminal Part Temperature
(°C)
For resistors operated at an ambient temperature
of 70°C or above, a power rating shall be derated
in accordance with the above derating curve.
For resistors operated terminal 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” in the
beginning of our catalog before use.
When using Power Rating
1
, please use the derating curves based on the terminal part temperature
on the right side.
T
Termination
Material
T: Sn
TD
Packaging
TD: 4mm pitch punched paper
TE: 4mm pitch embossed plastic
For further information on
packaging, please refer
to Appendix A
10R0
F
ordering information
WK73R
Type
WK73S
WK73R
2B
Size
2A: 0.75W, 1W
2B: 0.75W, 1W
2H: 1W
2J: 1W
3A: 1.5W, 2W
R
Characteristic
R: Anti-Sulfur
Nominal
Resistance
Resistance*
Tolerance
F: ±1%
±1%: 4 digits
J: ±5%
±5%: 3 digits
* Resistance value, 3 digits:
1~9.1Ω, 1R0~9R1
Resistance value, 4 digits:
1~9.76Ω, 1R00~9R76
10/26/21
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.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
57
resistors
WK73-RT
WK73-RT
wide terminal type flat chip resistors
(anti sulfuration)
applications and ratings
Part
Designation
WK73S2A
WK73R2A
Power
Rating
1.0W
1
0.75W
1.0W
1
0.75W
1.0W
1
0.75W
1.0W
1
WK73S2H
WK73R2H
WK73S2J
WK73R2J
WK73S3A
1.0W
1.0W
1.0W
1.0W
1.5W
2.0W
1
1.5W
WK73R3A
2.0W
1
70°C
115°C
Rated
Ambient
Temperature
70°C
70°C
70°C
70°C
70°C
70°C
70°C
70°C
70°C
70°C
70°C
70°C
70°C
70°C
Rated
Terminal
Part
Temperature
125°C
125°C
125°C
115°C
115°C
125°C
115°C
125°C
125°C
100°C
100°C
125°C
115°C
125°C
T.C.R.
(X 10
-6
/K)
±100
±100
±100
±100
±100
±150
±100
±200
±100
±100
±150
±100
±200
±100
±100
±200
±100
±100
±100
±200
±100
±200
Resistance Range (Ω)
F±1%
E-24 • E-96
1 ~ 9.76
20.5k ~ 1M
10 ~ 20k
1 ~ 9.76
1 ~ 9.76
0.3 ~ 0.976
10 ~ 9.76k
10k ~ 1M
10 ~ 9.76k
1 ~ 9.76
0.2 ~ 0.976
10 ~ 430k
432k - 1M
1 ~ 9.76
10 ~ 510k
511k ~ 1M
1 ~ 9.76
1 ~ 9.76
10 ~ 330k
332k - 1M
10 ~ 330k
332k - 1M
J±5%
E-24
1 ~ 9.1
22k ~ 1M
10 ~ 20k
1 ~ 9.1
1 ~ 9.1
0.3 ~ 0.91
10 ~ 9.1k
10k ~ 1M
10 ~ 9.1k
1 ~ 9.1
0.2 ~ 0.91
10 ~ 430k
470k - 1M
1~9.1
10 ~ 510k
560k ~ 1M
1 ~ 9.1
1 ~ 9.1
10 ~ 330k
360k - 1M
10 ~ 330k
360k - 1M
Maximum
Working
Voltage
Maximum
Overload
Voltage
Operating
Temperature
Range
resistors
WK73S2B
200V
400V
WK73R2B
200V
400V
-55°C
to
+155°C
200V
400V
200V
400V
Rated voltage =
√Power
rating x resistance value or max. working voltage, whichever is lower
1
When using Power Rating, please use the derating curves based on the terminal part temperature on the right side
of the graph located on the previous page.
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 the “Introduction of the derating curves based on the terminal
part temperature” in the beginning of the catalog.
environmental applications
Performance Characteristics
Parameter
Resistance
T.C.R.
Overload (Short time)
Requirement
∆
R ±(%+0.005Ω)
Limit
Typical
Within specified
—
tolerance
Within specified
—
T.C.R.
±2%
±0.2%
Test Method
25°C
+25°C/-55°C and +25°C/+125°C
WK732B, S2H, R2H, S2J, R2J: Rated voltage x 2.5 for 5 seconds
WK73S/R2A (0.75W, 1W), WK73S/R2B (1W), WK73S/R3A (2W):
Rated voltage x 2.0 for 5 seconds
Resistance to Solder Heat
±1%
±0.2%
260°C ± 5°C, 10 seconds ± 1 second
Bending Test
±1%
±0.1%
Holding point 90mm, Bending 1 time, Bending 5mm
Rapid Change of Temperature
±2%
±1%
-55°C (30 minutes), +125°C (30 minutes), 100 cycles
Moisture Resistance
±2%
±0.2%
40°C ± 2°C, 90%-95% RH, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
Endurance at 70°C
±2%
±0.2%
70°C ± 2°C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
±
1%
±
0.2%
+155°C, 1000 hours
High Temperature Exposure
Sulfuration Test
±5%
±0.2%
Soaked in industrial oil with 3.5% sulfur concentration 105°C ± 3°C, 500 hours
Please refer to conventional products for characteristic data such as temperature rise.
Additional environmental applications can also be found at 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.
10/26/21
58
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
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