WK73S
wide terminal type flat chip resistors
EU
resistors
c
L
c
W
t
d
Inner
Resistive Electrode
Film
Solder
Plating
Ni
Plating
Protective
Coating Ceramic
Substrate
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 ±1%
•
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: 0612(2B/2B15), 1020(2H), 1218(2J), 1225(3A)
dimensions and construction
Type
(Inch Size Code)
L
Dimensions
inches
(mm)
W
c
d
t
2B
(0612)
2H
(1020)
2J
(1218)
3A
(1225)
.063±.006 .126±.006 .012±.008 .018±.006
(1.6±0.15) (3.2±0.2)
(0.3±0.2) (0.45±0.15)
.098±.006 .197±.006 .016±.008
(2.5±0.15) (5.0±0.15) (0.4±0.2)
.024±.004
.122±.006 .181±.006 .016±.008 .030±.006
(0.6±0.1)
(3.1±0.15) (4.6±0.15) (0.4±0.2) (0.75±0.15)
.122±.006 .252±.006 .018±.008
(3.1±0.15) (6.3±0.15) (0.45±0.2)
Derating Curve
100
80
% Rated Power
% Rated Power
100
80
60
40
20
0
-60 -40 -20
-55
2J (100°C)
WK73S2B (1W), WK73S3A (2W)
100
80
% Rated Power
2H2, 3A3 (95°C)
60
40
20
0
-60 -40 -20
-55
2B, 3A (115°C)
60
40
20
0
-60 -40 -20
-55
2B, 2H, 3A (125°C)
0
20
40
60
80 100 120 140
70
Ambient Temperature
(°C)
160
155
0
80 100 120 140 160
125
155
Terminal Part Temperature
(°C)
40
60
20
0
100 120 140 160
95
115
155
Terminal Part Temperature
(°C)
40
60
80
20
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
WK73S
Type
WK73S
2J
Size
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
TD: 0612: 7" 4mm pitch
punched paper
TE: 1020, 1218, 1225:
7" embossed plastic
TED: 1020, 1218, 1225:
10" 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.
11/08/17
82
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
WK73S
wide terminal type flat chip resistors
resistors
applications and ratings
Part
Designation
Power
Rating
Rated
Rated
T.C.R.
Ambient Terminal
(X 10
-6
/K)
Temp. Part Temp.
70°C
125°C
±800
±200
±100
±800
±200
±100
±800
±200
±100
±800
±200
±100
±800
±300
±200
±100
±800
±300
±200
±100
Resistance Range (Ω)
D±0.5%
E-24/E-96
F±1%
E-24/E-96
—
J±5%
E-24
10m - 27m
30m - 390m
430m - 9.1
10m - 27m
30m - 390m
430m - 9.1
10m - 24m
27m - 200m
220m - 9.1
10m - 30m
33m - 220m
240m - 9.1
10m - 20m
22m - 30m
33m - 330m
360m - 9.1
10m - 20m
22m - 30m
33m - 330m
360m - 9.1
Maximum Maximum Operating
Working Overload
Temp.
Voltage
Voltage
Range
0.75W
WK73S2B
1.0W
1
––
115°C
WK73S2H
1.0W
70°C
125°C
WK73S2J
1.0W
70°C
100°C
1.5W
WK73S3A
2.0W
1
70°C
125°C
––
115°C
—
—
30m - 422m
430m - 9.76
430m - 9.76
—
—
—
30m - 422m
430m - 9.76 430m - 9.76
—
—
27m - 215m
—
—
220m - 9.76
—
—
33m - 237m
—
—
240m - 9.76
—
—
22m - 32.4m
—
—
33m - 357m
—
360m - 9.76
—
—
22m - 32.4m
—
—
33m - 357m
—
360m - 9.76
200V
400V
200V
400V
-55°C
to
+155°C
200V
400V
200V
400V
Terminal Part Temperature Rise (°C)
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
Device Temperature Data
250
200
2H2-2W
150
3A3-3W
100
50
3A-2W
3A-1.5W
2B-0.75W 2H-1W
20mm
30mm
40mm
50mm
0
0mm
Room Temperature 25°C PCB:
FR-4 t=1.6mm Cu foil
thickness=35µm
While using under high power,
the temperature of the product
may increase depending
on the condition of heat
dissipation from PCB.
Be sure to check the terminal
part temperature as well as
precautions for use on delivery
specifications before use.
10mm
Pattern Width (mm)
environmental applications
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%
±1%
±1%
±0.5%
±2%
±2%
±0.2%
±0.2%
±0.1%
±0.3%
±0.2%
±0.2%
Test Method
25°C
+25°C/-55°C and +25°C/+125°C
WK73S2B (1W), WK73S3A (2W): Rated voltage x2.0 for 5 seconds.
WK7S2B, S2H, S2J, S3A: 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), +155°C (30 minutes), 5 cycles
40°C ± 2°C, 90%-95% RH, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
70°C ± 2°C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
±2%: WK73S (±5%) ±0.5%: WK73S (±5%)
+155°C, 1000 hours
±0.2%: all others
±1%: all others
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.
11/08/17
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
83
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