FeATures
• Welded construction
• Inorganic and non-hygroscopic,
Centohm coating seals and pro-
tects the resistance wire.
• Exceeds MIL-R-26 moisture
requirements
• Centohm Resistors are designed
to meet and exceed performance
characteristics of vitreous enam-
el resistors.
• Centohm is more cost effective
than vitreous enamel.
• ±5% resistance tolerance
Ohmite’s Axiohm resistors are
Centohm coated for maximum
reliability. These all-welded
units are characterized by their
low temperature coefficients
and resistance to thermal
shock, making them ideal for
a wide range of electrical and
electronic applications.
Axiohm Series
Centohm Coated
Axial Terminal Wirewound
A
B
C
1.5 in. /
38.1mm
D
resistance
Dielectric
C
D max.
range
standard With- Maximum
Wire
clean term.
(Ω)
resistance standing Voltage
A
B
Gauge
to clean
Min. Max. Tolerance Voltage rating ±.063”/±1.60mm ±.031”/0.79mm
(dia.)
term. in./mm
0.1
4K
±5%
500
100 0.313±.031 /
7.95±.79
0.094 /
2.39
#24 (.020”) 0.406 /
10.31
0.1 10K
±5%
500
300
0.375 /
9.53
0.219 /
5.56
#20 (.032”) 0.469 /
11.91
0.1 20K
±5%
500
450
0.5
/
12.7
0.219 /
5.56
#20 (.032”) 0.594 /
15.09
0.1 30K
±5%
500
600
0.688 /
17.48
0.219 /
5.56
#20 (.032”) 0.813 /
20.65
0.1 40K
±5%
500
800
0.938 /
23.83
0.219 /
5.56
#20 (.032”) 1.063 /
27.00
0.1 50K
±5%
500
875
1
/
25.4
0.313 /
7.95
#20 (.032”) 1.125 /
28.58
0.1 90K
±5%
500
1600
1.563 /
39.7
0.313 /
7.95
#20 (.032”) 1.688 /
42.67
Terminals:
Tinned Copper weld.
RoHS solder composition is
96% Sn, 3.5% Ag, 0.5% Cu
Derating
Linearly from
100% @ +25°C to
0% @ +350°C.
Electrical
Tolerance:
±5% (Std) down to
0.1% available.
Power rating:
Based on 25°C
free air rating (other wattages
available).
Overload:
Under 5 watts: 5 times
rated wattage for 5 seconds. 5
watts and over: 10 times rated
wattage for 5 seconds.
Temperature coefficient:
0 ±30ppm /°C above 10Ω
0 ±100ppm/°C 1 to 10Ω
0 ±200ppm/°C below 1Ω
OpTiOns
Noninductive:
This specially
designed version is wound using
the Ayrton-Perry method.
Resistance Tolerances:
Options
include 5%, 1%, 0.5%, 0.25%,
and 0.1% resistors.
Terminal Sizes:
Alternate terminal
diameters available.
Tape and Reel:
Resistors taped
for automatic insertion. Contact
Ohmite for size, quantity and
ordering information
Watt
rating
Form
1C
2C
3C
4C
5C
7C
10C
speCiFiCATiOns
Material
Coating:
Flameproof proprietary
Centohm
Core:
Ceramic
Element:
Copper-nickel alloy or
nickel-chrome alloy depending
on resistance value
End Cap:
Stainless steel
P e r f O r m a n c e d ata
Test
Temperature Coefficient
Thermal Shock
Short Time Overload
Dielectric
Low Temperature Storage
High Temperature Exposure
Moisture Resistance
Shock
Vibration
Load Life
Terminal Strength
Maximum
±30ppm/°C above 10Ω
±100ppm/°C 1 to 10Ω
±200ppm/°C below 1Ω
±
±
±
±
±
±
±
±
±
±
(2% + .05Ω)∆R
(2% + .05Ω)∆R
(0.1% + .05Ω)∆R
(2% + .05Ω)∆R
(2% + .05Ω)∆R
(2% + .05Ω)∆R
(2% + .05Ω)∆R
(2% + .05Ω)∆R
(3% + .05Ω)∆R
(1% + .05Ω)∆R
Non-Inductive
Option
(Add N)
O r d e r i n g i n f O r m at i O n
E = RoHS compliant
Example:
Std 3 watt,
10K
±
5% = 3CJ10K
½½½½½½½½
Wattage
Coating
"C" for
Centohm
Tolerance
J = 5% (standard)
H = 3%
F = 1%
D = .5%
Q = .25%
B = .1%
Resistance (Ω)
use "K" for 1000
multiplier; use "R"
for decimal point
∆R
values are maximums based on MIL-R-26 testing requirements at 350°C.
Ohmite Mfg. Co.
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
25
Analog electronics
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