wide terminal type flat chip resistors
EU
features
•
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 Tested
Type
dimensions and construction
c
L
c
(Inch Size Code)
L
.020±.002
(0.5±0.05)
.031±.004
(0.8±0.1)
.049±.006
(1.25±0.15)
.063±.006
(1.6±0.15)
.098±.006
(2.5±0.15)
.122±.006
(3.1±0.15)
.122±.006
(3.1±0.15)
Dimensions
inches
(mm)
W
c
d
.039±.002
(1.0±0.05)
.063±.004
(1.6±0.1)
.079±.006
(2.0±0.15)
.126±.008
(3.2±0.2)
.197±.006
(5.0±0.15)
.181±.006
(4.6±0.15)
.252±.006
(6.3±0.15)
.006±.002
(0.15±0.05)
.006±.004
(0.15±0.1)
.012±.008
(0.3±0.2)
.012±.008
(0.3±0.2)
.016±.008
(0.4±0.2)
.016±.008
(0.4±0.2)
.018±.008
(0.45±0.2)
.006±.002
(0.15±0.05)
.008±.004
(0.2±0.1)
.014±.008
(0.35±0.2)
.018±.006
(0.45±0.15)
t
.014±.002
(0.35±0.05)
.018±.004
(0.45±0.1)
.022±.004
(0.55±0.1)
W
1E
(0204)
1J
(0306)
2A
(0508)
2B
(0612)
2H
(1020)
2J
(1218)
3A
(1225)
t
d
Inner
Resistive Electrode
Film
Solder
Plating
Ni
Plating
Protective
Coating Ceramic
Substrate
.030±.006
(0.75±0.15)
.024±.004
(0.6±0.1)
Derating Curve
100
80
% Rated Power
% Rated Power
100
2J (100°C)
80
WK73R2B (1W), WK73R3A (2W)
100
80
% Rated Power
2B, 3A (115°C)
60
40
20
0
-60 -40 -20
-55
1E, 1J, 2A, 2B,
2H, 3A (125°C)
60
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)
40
60
20
0
100 120 140 160
115
155
Terminal Part Temperature
(°C)
20
40
60
80
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.
ordering information
WK73R
Type
WK73R
2J
Size
1E: 0.33W
1J: 0.5W
2A: 0.75W, 1W
2B: 0.75W, 1W
2H: 1W
2J: 1W
3A: 1.5W, 2W
T
Termination
Material
T: Sn
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.
TE
Packaging
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
33L0
Nominal
Resistance
±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
F
Resistance
Tolerance
D: ±0.5%
F: ±1%
J: ±5%
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
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
31
resistors
WK73R
WK73R
wide terminal type flat chip resistors
applications and ratings
Part
Designation
WK73R1E
WK73R1J
WK73R2A
WK73R2B
WK73R2H
WK73R2J
Power
Rating
0.33W
1
0.5W
0.75W
1
1.0W
1
0.75W
1.0W
1
1
One-Pulse Limiting Electric Power (W)
One-Pulse Limiting Electric Power (W)
Temperature Rise (°C)
80
60
40
20
0
Temperature Rise (°C)
Temperature Rise (°C)
resistors
Rated
Ambient
Temp.
70°C
70°C
70°C
70°C
70°C
70°C
70°C
70°C
70°C
70°C
Rated
Terminal
Part Temp.
125°C
125°C
125°C
125°C
125°C
115°C
125°C
100°C
125°C
115°C
T.C.R.
(X 10
-6
/K)
±100
±100
±100
±100
±100
±100
±100
±200
±100
±200
±100
±200
±100
±200
Resistance Range (Ω)
D±0.5%
E-24/E-96
––
––
––
––
10 - 1M
10 - 9.76k
—
—
—
—
—
—
—
—
F±1%
E-24/E-96
10 -1M
10 - 1M
20.5k - 1M
10 - 20k
10 - 1M
10 - 9.76k
10 - 430k
432k - 1M
10 - 510k
511k - 1M
10 - 330k
332k - 1M
10 - 330k
332k - 1M
J±5%
E-24
10 - 1M
10 - 1M
22k - 1M
10 - 20k
10 - 1M
10 - 9.1k
10 - 430k
470k - 1M
10 - 510k
560k - 1M
10 - 330k
360k - 1M
10 - 330k
360k - 1M
Maximum
Working
Voltage
75V
150V
200V
200V
200V
200V
Maximum
Overload
Voltage
100V
200V
400V
400V
400V
400V
Operating
Temp.
Range
1.0W
1.0W
1.5W
-55°C
to
+155°C
WK73R3A
2.0W
1
200V
400V
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
environmental applications
Temperature Rise
WK73R 1E-1J
100
1J
1E
1J
1E
One-Pulse Limiting Electric Power
WK73R 1E-2A
100
2A
2B
2A
2B
WK73R 2A-2B
140
120
100
80
60
40
20
0
10
20
30
40
50
60
70
80
90 100
WK73R 2B-3A
1000
10
2A
1J
1E
100
1
10
0.1
0.01
.001
10
20
30
40
50
60
70
80
90 100
3A
2H/2J
2B
(10-3.3kΩ)
2B
(3.6k-1MΩ)
Power Rating
(%)
Power Rating
(%)
.01
.1
1
10
100
1000
1
.001
.01
.1
1
10
100
1000
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.
WK73R 2H-3A
140
120
100
80
60
40
20
0
10
20
30
40
50
60
70
80
90 100
3A
2H/2J
3A
2H/2J
Pulse Duration
(ms)
Measurement condition
Room temperature: 25°C
PCB: FR-4t = 1.6mm
Cu foil thickness: 35µm
①:
Hot spot
②:
Terminal
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.
Power Rating
(%)
Performance Characteristics
Parameter
Resistance
T.C.R.
Overload (Short time)
Resistance to Solder Heat
Bending Test
Rapid Change of Temperature
Moisture Resistance
Endurance at 70°C
High Temperature Exposure
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
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
260°C ± 5°C, 10 seconds ± 1 second
Holding point 90mm, Bending 1 time, Bending 5mm
-55°C (30 minutes), +125°C (30 minutes), 1000 cycles
±1%
±0.2%
±1%
±0.1%
±2%
±1%
±3%: 1E
±1%: 1E
40°C ± 2°C, 90%-95% RH, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
±2%: All others ±0.2%: All others
±3%: 1E
±1%: 1E
70°C ± 2°C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
±2%: All others ±0.2%: All others
±1%
±0.2%
+155°C, 1000 hours
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.
11/09/21
32
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
