WK73R Series Datasheet by KOA Speer Electronics, Inc.
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KDA SPEER ELECTRONICS, INC. /
features
WK73R
wide terminal type flat chip resistors
dimensions and construction
Protective
Coating
Inner
Electrode
Resistive
Film
Ceramic
Substrate
Solder
Plating
Ni
Plating
Lcc
W
t
d
D: ±0.5%
F: ±1%
J: ±5%
T: Sn
±1%: 3 significant figures + 1
multiplier “R” indicates decimal
on value <100Ω
±5%: 2 significant figures + 1
multiplier “R” indicates decimal
on values <10Ω
All values less than 0.1Ω
(100mΩ) are expressed in mΩ
with “L” as decimal.
Ex: 33mΩ, 1% = 33L0
1E: 0.33W
1J: 0.5W
2A: 0.75W, 1W
2B: 0.75W, 1W
2H: 1W
2J: 1W
3A: 1.5W, 2W
WK73R TP: 0204: 7" 2mm pitch
punched paper
TD: 0306, 0508, 0612: 7"
4mm pitch punched paper
TE: 1020, 1218, 1225:
7" embossed plastic
For further information on
packaging, please refer
to Appendix A
WK73R
Type Size Nominal
Resistance Resistance
Tolerance
Termination
Material Packaging
2J TE 33L0 FT
Type
L
.030±.006
(0.75±0.15)
.024±.004
(0.6±0.1)
.018±.004
(0.45±0.1)
.016±.008
(0.4±0.2)
.018±.008
(0.45±0.2)
.252±.006
(6.3±0.15)
.122±.006
(3.1±0.15)
.181±.006
(4.6±0.15)
.122±.006
(3.1±0.15)
2J
(1218)
3A
(1225)
(Inch Size Code) Wc d t
Dimensions inches (mm)
.016±.008
(0.4±0.2)
.197±.006
(5.0±0.15)
.098±.006
(2.5±0.15)
2H
(1020)
.012±.008
(0.3±0.2)
.126±.008
(3.2±0.2)
.063±.006
(1.6±0.15)
2B
(0612) .018±.006
(0.45±0.15)
.006±.002
(0.15±0.05)
.039±.002
(1.0±0.05)
.020±.002
(0.5±0.05)
1E
(0204)
.008±.004
(0.2±0.1)
.014±.002
(0.35±0.05)
.006±.002
(0.15±0.05)
.006±.004
(0.15±0.1)
.063±.004
(1.6±0.1)
.031±.004
(0.8±0.1)
1J
(0306)
ordering information
EU
Derating Curve
% Rated Power
100
80
60
40
20
-60 -40 04060 80 100 160
70
20
Ambient Temperature
(°C)
0
-55
120
155
-20 140
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.
% Rated Power
100
80
60
40
20
-60 -40 0 40 60 80 100 160
125
20
Terminal Part Temperature
(°C)
0
-55
120
155
-20 140
1E, 1J, 2A, 2B,
2H, 3A (125°C)
2J (100°C)
% Rated Power
100
80
60
40
20
-60 -40 0 40 60 80 100 160
115
20
Terminal Part Temperature
(°C)
0
-55
120
155
-20 140
2B, 3A (115°C)
For resistors operated terminal temperature of described for each size or above, a power rating
shall be derated in accordance with the derating curve above.
Please refer to “Introduction of the derating curve based on the terminal part temperature” in the
beginning of our catalog before use.
If you want to use at rated power (*1), use derating curves based on the terminal part temperature
on the right side graph.
• Wide-side termination (reverse-geometry)
type flat chip resistor
• High reliability and performance with T.C.R.
±100 x 10-6/K, resistance tolerance ±0.5%
• Products with lead-free terminations meet EU RoHS
requirements. EU RoHS regulation is not intended for
Pb-glass contained in electrode, resistor element and glass.
• AEC-Q200 Qualified
WK73R2B (1W), WK73R3A (2W)
.022±.004
(0.55±0.1)
.014±.008
(0.35±0.2)
.012±.008
(0.3±0.2)
.079±.006
(2.0±0.15)
.049±.006
(1.25±0.15)
2A
(0508)
31
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. 12/17/19
resistors
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