WK73S
wide terminal type flat chip resistors (low resistance)
EU
• 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%
• Suitable for both reflow and flow solderings
• 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
dimensions and construction
Type
L
c
(Inch Size Code)
c
W
Solder
Plating
Ni
Plating
t
d
Inner
Resistive Electrode
Film
Protective
Coating Ceramic
Substrate
Dimensions inches (mm)
W
c
d
L
.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)
2B
(0612)
.063±.006 .126±.008 .012±.008 .018±.006
(1.6±0.15) (3.2±0.2)
(0.3±0.2) (0.45±0.15)
2H
(1020)
.098±.006 .197±.006 .016±.008
(2.5±0.15) (5.0±0.15) (0.4±0.2)
2J*
(1218)
.122±.006 .181±.006 .016±.008 .030±.006
(3.1±0.15) (4.6±0.15) (0.4±0.2) (0.75±0.15)
3A
(1225)
.122±.006 .252±.006 .018±.008
(3.1±0.15) (6.3±0.15) (0.45±0.2)
Derating Curve
60
40
100
2J (100°C)
60
80
% Rated Power
80
% Rated Power
80
% Rated Power
100
2A, 2B, 2H, 3A (125°C)
40
20
20
0
20
.024±.004
(0.6±0.1)
WK73S2B (1W), WK73S3A (2W)
100
0
-60 -40 -20
-55
t
2A
(0508)
40
60
80 100 120 140 160
70
155
Ambient 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.
ordering information
WK73S
2J
Type
Size
WK73S
2A: 1W
2B: 0.75W, 1W
2H: 1W
2J*: 1W
3A: 1.5W, 2W
2B, 3A (115°C)
40
20
0
-60 -40 -20
-55
80 100 120 140 160
125
155
Terminal Part Temperature
(°C)
0
20
40
60
0
-60 -40 -20
-55
100 120 140 160
20 40 60 80
95
115
155
Terminal Part Temperature
(°C)
0
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.
T
Termination
Material
T: Sn
2H2, 3A3 (95°C)
60
TE
Packaging
TD: 0508, 0612: 7" 4mm pitch
punched paper
TE: 1020, 1218, 1225:
7" embossed plastic
For further information on
packaging, please refer to
Appendix A
* WK73S2J Not Recommended for New Design
Recommended replacement WK73S2H
33L0
F
Nominal
Resistance
±1%: 3 significant figures + 1
multiplier “R” indicates decimal
on value
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