24 Ohmite Mfg. Co. 1600 Golf Rd., Rolling Meadows, IL 60008 • 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
Ohmite Mfg. Co. 1600 Golf Rd., Rolling Meadows, IL 60008 • 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com 25
ORDERING INFORMATION
Axiohm Series
Centohm Coated
Axial Terminal Wirewound
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.
PERFORMANCE DATA
Test Maximum
±30ppm/°C above 10Ω
Temperature Coefficient ±100ppm/°C 1 to 10Ω
±200ppm/°C below 1Ω
Thermal Shock ± (2% + .05Ω)ΔR
Short Time Overload ± (2% + .05Ω)ΔR
Dielectric ± (0.1% + .05Ω)ΔR
Low Temperature Storage ± (2% + .05Ω)ΔR
High Temperature Exposure ± (2% + .05Ω)ΔR
Moisture Resistance ± (2% + .05Ω)ΔR
Shock ± (2% + .05Ω)ΔR
Vibration ± (2% + .05Ω)ΔR
Load Life ± (3% + .05Ω)ΔR
Terminal Strength ± (1% + .05Ω)ΔR
ΔR values are maximums based on MIL-R-26 testing requirements at 350°C.
A B
1.5 /
38.1
C
D
Wattage Coating
"C" for
Centohm
Example:
Std 3 watt,
10K ± 5% = 3CJ10K
Non-Inductive
Option (Add N)
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
E = RoHS compliant
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
OPTIONS
Noninductive Resistors: These
specially designed versions are
wound using the Ayrton-Perry
method.
Controlled or Limited
Inductance Resistors: Using
special single windings, these
versions limit the inductance to a
specified value.
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
Resistance C D
Watt Range Standard Dielectric Maximum Wire max clean
Rating (Ω) Resistance Withstanding Voltage A B Gauge term. to
Form Min. Max. Tolerance Voltage Rating ±.063” ±.031” (dia.) clean term.
1C 0.1 4K ±5% 500 100 0.313±.031 0.094 #24 (.020”) 0.406
2C 0.1 10K ±5% 500 300 0.375 0.219 #20 (.032”) 0.469
3C 0.1 20K ±5% 500 450 0.5 0.219 #20 (.032”) 0.594
4C 0.1 30K ±5% 500 600 0.688 0.219 #20 (.032”) 0.813
5C 0.1 40K ±5% 500 800 0.938 0.219 #20 (.032”) 1.063
7C 0.1 50K ±5% 500 875 1 0.313 #20 (.032”) 1.125
10C 0.1 90K ±5% 500 1600 1.563 0.313 #20 (.032”) 1.688
SPECIFICATIONS
Material
Coating: Flameproof proprietary
Centohm
Core: Ceramic
Element: Copper-nickel alloy or
nickel-chrome alloy depending
on resistance value
End Cap: Stainless steel
Terminals: Tinned Copper weld
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
