F e at u r e s
• Welded construction
• Inorganic and non-hygroscopic,
Centohm coating seals and protects the resistance wire.
• Exceeds MIL-R-26 moisture
requirements
• Centohm Resistors are designed
to meet and exceed performance
characteristics of vitreous enamel resistors.
• Centohm is more cost effective
than vitreous enamel.
• ±5% resistance tolerance
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
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
1.5 in. / 38.1mm
A
C
D
Watt
Rating
Form
1C
2C
3C
4C
5C
7C
10C
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
S p e c i f i cat i o n s
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.
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.
P e r f o r m a n c e D ata
Test
B
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
O r d e r i n g I n f o r m at i o n
Maximum
Temperature Coefficient
±30ppm/°C above 10Ω
±100ppm/°C 1 to 10Ω
±200ppm/°C below 1Ω
Thermal Shock
Short Time Overload
Dielectric
Low Temperature Storage
High Temperature Exposure
Moisture Resistance
Shock
Vibration
Load Life
Terminal Strength
±
±
±
±
±
±
±
±
±
±
Non-Inductive
Option (Add N)
E = RoHS compliant
��������
(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
Wattage
Coating
"C" for
Centohm
Tolerance
J = 5% (standard)
H = 3%
F = 1%
D = .5%
Q = .25%
B = .1%
Example:
Std 3 watt,
10K ± 5% = 3CJ10K
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
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