WK73R
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 inches (mm)
(Inch Size Code)
L
W
c
d
t
dimensions and construction
1E
.020±.002 .039±.002 .006±.002 .006±.002 .014±.002
(0204)
(0.5 0.05) (1.0 0.05) (0.15 0.05) (0.15 0.05) (0.35 0.05)
L
c
c
1J
(0306)
.031±.004 .063±.004 .006±.004 .008±.004 .018±.004
(0.8 0.1)
(1.6 0.1) (0.15 0.1) (0.2 0.1) (0.45 0.1)
W
2A
(0508)
.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
.063±.006 .126±.008 .012±.008 .018±.006
Solder
Plating
(0612)
(1.6 0.15) (3.2 0.2)
(0.3 0.2) (0.45 0.15)
Ni
t
2H
(1020)
.098±.006 .197±.006 .016±.008
(2.5 0.15) (5.0 0.15) (0.4 0.2)
Plating
Inner
Electrode
.024±.004
(0.6 0.1)
Resistive
Film
d
2J
(1218)
.122±.006 .181±.006 .016±.008
(3.1 0.15) (4.6 0.15) (0.4 0.2)
.030±.006
(0.75 0.15)
Protective
Coating
Ceramic
Substrate
3A
(1225)
.122±.006 .252±.006 .018±.008
(3.1 0.15) (6.3 0.15) (0.45 0.2)
Derating Curve
100
WK73R2B (1W), WK73R3A (2W)
100
80
100
80
2J (100°C)
80
2B, 3A (115°C)
60
40
60
40
1E, 1J, 2A, 2B,
2H, 3A (125°C)
60
40
20
0
20
0
20
0
-60 -40 -20
-55
0
20 40 60 80 100 120 140 160
-60 -40 -20
0
20 40 60 80 100 120 140 160
-60 -40 -20
0
20 40 60 80
100 120 140 160
115 155
70
Ambient Temperature
(°C)
155
-55
125
155
-55
Terminal Part Temperature
(°C)
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 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.
ordering information
WK73R
2J
T
TE
33L0
F
Termination
Material
Nominal
Resistance
Resistance
Tolerance
Type
Size
Packaging
TP: 0204: 7" 2mm pitch
punched paper
WK73R
1E: 0.33W
1J: 0.5W
2A: 0.75W, 1W
2B: 0.75W, 1W
2H: 1W
T: Sn
±1%: 3 significant figures + 1
multiplier “R” indicates decimal
on value <100Ω
D: ±0.5%
F: ±1%
J: ±5%
TD: 0306, 0508, 0612: 7"
4mm pitch punched paper
±5%: 2 significant figures + 1
multiplier “R” indicates decimal
on values <10Ω
TE: 1020, 1218, 1225:
7" embossed plastic
For further information on
packaging, please refer
to Appendix A
2J: 1W
All values less than 0.1Ω
(100mΩ) are expressed in mΩ
with “L” as decimal.
3A: 1.5W, 2W
Ex: 33mΩ, 1% = 33L0
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
31
KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com