F E A T U R E S
C O N S T R U C T I O N
• High precision
All Welded Construction: The
combination of all welded con-
struction and compatible materials
provide the most reliable means of
interconnects possible.
Butt Weld of Tab to Terminal:
A tab material of 800 ohm alloy
(the same as the resistance wire)
is butt welded to the terminal and
molded deep into the resistor
bobbin. This design parameter
assures the least possible DC
transients due to thermal EMF.
HPW Series
• All welded construction
• Molded thermosetting plastic
bobbin
• Wide ohmic range combined with
tight tolerance
• Excellent long-term stability
• Inherent low temperature coef-
ficient
• Extremely low Thermal EMF
• Low voltage coefficient
• Low noise
High Precision Welded Axial and Radial
Axial
1.25" / 31.75mm
B
A
min.
Round Radial
Flat Radial
C
A
C
Bobbin Design: The ratio of the
height of the Pi wall to the width
of the Pi and to the diameter of
the bobbin mandrel are critical to
the basic stability of a wirewound
resistor. These parameters are
optimized for each wire size, watt-
age size and range of resistor
values.
Encapsulation Material: Both the
bobbin and the final encapsulation
material are thermoset-
ting alkyd polyester. The
resulting resistor is vir-
S P E C I F I C A T I O N S
Minimum Values: 0.1Ω for ±1%
and ±0.5%; 10Ω for ±0.1% and
tighter
A
B
Model
Dim. C
Dim. D
B
D
101P 0.150 / 3.81 0.110 / 2.79
102P 0.125 / 3.18 0.125 / 3.18
Resistance Tolerance: ±0.005%,
±0.01%, ± 0.02%, ±0.05%,
±0.1%, ±0.5%, and ±1%,
depending on style and value
Temperature Coefficient (TCR):
±10ppm/°C standard for 10Ω
and above. Higher TC’s on
low ohmic values. TC match
to ±1ppm/°C. High TC’s upto
+6000ppm/°C are available
Standard temperature range:
–10°C to +80°C
203PC 0.150 / 3.81
203PA 0.200 / 5.08
305PA 0.200 / 5.08
505PA 0.300 / 7.62
—
—
—
—
Power Rating
Max. @125°C Max.
Ohms (Watts) Volts
Overall Dimensions
tually a homogeneous
(±.020 in./ ±.508 mm)
mass with an identical
coefficient of expansion
which is unaffected
by the most violent of
temperature cycling. All
types are unaffected by
application of solvents.
Terminal Materials:
The standard terminal
material is hot solder
dipped copper (C5N).
Other available materi-
als are bare nickel
(N1N) and gold plated
nickel (N2N).
Type
A
B
AWG Lead Diam.
123A
118A
122A
102A
102AL
101A
153A
103A
135A
105A
184A
185A*
202A
204A
203A
111k
192k
199k
334k
334k
410k
435k
633k
750k
820k
820k
961k
968k
1.42 M
1.7 M
0.05
0.05
0.05
0.10
0.10
0.10
0.10
0.10
0.10
0.125
0.125
0.125
0.25
0.25
0.25
0.33
0.50
0.60
0.50
0.60
1.00
1.00
1.25
1.50
1.75
2.00
0.125
0.125
0.25
0.25
0.50
1.00
150 0.100 / 2.54 0.230 / 5.84 24* 0.020 / 0.508
Working temperature range:
–60°C to +145°C
150 0.130 / 3.30 0.180 / 4.57
150 0.123 / 3.12 0.218 / 5.54
150 0.110 / 2.79 0.250 / 6.35
150 0.130 / 3.30 0.313 / 7.95
26 0.016 / 0.406
24 0.020 / 0.508
24 0.020 / 0.508
24 0.020 / 0.508
300 0.130 / 3.30 0.375 / 9.53 22* 0.026 / 0.660
0.150 / 3.81 0.245 / 6.22
22 0.026 / 0.660
22 0.026 / 0.660
150 0.150 / 3.81 0.300 / 7.62
0.160 / 4.06 0.500 / 12.70 22 0.026 / 0.660
0.150 / 3.81 0.310 / 7.87
22 0.026 / 0.660
22 0.026 / 0.660
300 0.187 / 4.75 0.375 / 9.53
300 0.187 / 4.75 0.500 / 12.70 22 0.026 / 0.660
200 0.250 / 6.35 0.310 / 7.87
0.250 / 6.35 0.375 / 9.53
200 0.250 / 6.35 0.343 / 8.71
400 0.250 / 6.35 0.500 / 12.70 20* 0.032 / 0.813
800 0.250 / 6.35 0.750 / 19.05 20* 0.032 / 0.813
800 0.312 / 7.93 0.810 / 20.57 20 0.032 / 0.813
800 0.250 / 6.35 1.00 / 25.40
0.375 / 9.53 0.750 / 19.05 20 0.032 / 0.813
800 0.375 / 9.53 1.00 / 25.40 20 0.032 / 0.813
0.500 / 12.70 0.500 / 12.70 20 0.032 / 0.813
800 0.500 / 12.70 1.00 / 25.40
1200 0.500 / 12.70 1.50 / 38.10
1200 0.500 / 12.70 1.75 / 44.45
1200 0.500 / 12.70 2.00 / 50.8
150 0.300 / 7.62 0.320 / 8.13
22 0.026 / 0.660
20 0.032 / 0.813
20 0.032 / 0.813
O R D E R I N G I N F O R M AT I O N
2 0 3 A 1 M 7 0 0 T
205A* 1.93 M
207A* 3.0 M
308A
Format*
Tolerance
T = 0.01%
Q = 0.02%
A = 0.05%
B = 0.1%
F = 1.0%
Type
Resistance
A, AL = axial
P = flat radial
PA, PC = round
radial
1R000 =
1 Ω
3.0 M
10R00 = 10 Ω
100R0 = 100 Ω
1K000 = 1000 Ω
10K00 = 10 KΩ
100K0 = 100 KΩ
1M700 = 1.7 MΩ
210A* 4.10 M
20 0.032 / 0.813
307A
310A
505A
5.63 M
7.68 M
10 M
*Not every format
is available in
every wattage
Check product availability at www.ohmite.com
510A* 24 M
515A* 35 M
20 0.032 / 0.813
20 0.032 / 0.813
20 0.032 / 0.813
20 0.032 / 0.813
22 0.026 / 0.660
517A
520A* 43 M
43 M
101P
102P
203PC 1.59 M
203PA 1.48 M
305PA 3.3 M
505PA 9.5 M
453k
821k
150 0.250 / 6.35 0.250 / 6.35 22* 0.026 / 0.660
150 0.250 / 7.92 0.312 / 7.93
150 0.270 / 6.86 0.320 / 8.13
Our friendly Customer
Service team can be
reached at 866-9-OHMITE
22 0.026 / 0.660
22 0.026 / 0.660
0.375 / 9.53 0.500 / 12.70 20 0.032 / 0.813
0.500 / 12.70 0.500 / 12.70 20 0.032 / 0.813
*Available in hermetically sealed
Ohmite Mfg. Co.
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
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