FeATureS
• Economical
• Applications include commercial,
industrial and communications
equipment
• Stability under high temperature
conditions
• All-welded construction
• RoHS compliant; add “E” suffix
to part number to specify.
SpeCiFiCATiOnS
Material
Coating:
Conformal silicone-
ceramic.
Core:
Ceramic.
Terminals:
Solder-coated copper
clad axial. RoHS solder com-
position is 96% Sn, 3.5% Ag,
0.5% Cu
Ohmicone
®
Silicone-Ceramic Conformal
Axial Term. Wirewound, 1% and 5% Tol. Std.
1.5 in. /
38.1mm
L
D
40 Series
Derating
Linearly from
100% @ +25°C to
0% @ +275°C.
Electrical
Tolerance:
±5% (J type), ±1%
(F type) (other tolerances avail-
able).
Power rating:
Based on
ordering info
25°C free air rating (other
wattages available).
40 Series
Ohmicone
®
Non-Inductive
Overload:
Under 5 watts:
Winding
Silicone Ceramic
5 times rated wattage for 5
Optional (blank
Conformal Axial
RoHS
= std. winding)
Term. Wirewound
Compliant
seconds. 5 watts and over:
10 times rated wattage for
5 seconds.
Wattage Tolerance Resistance Value
Temperature coefficient:
R10 = 0.10Ω
1 = 1W F= 1%
Under 1Ω: ±90 ppm/°C
J = 5%
1R0 = 1.0Ω
2
1Ω to 9.99Ω: ±50 ppm/°C
10R = 10.0Ω
3
250 =
250Ω
5
10Ω and over: ±20
1K0 = 1,000Ω
7
ppm/°C
4K5 = 4,500Ω
0 = 10W
Series Wattage Ohms
41
1.0
0.10-6K
42
2.0
0.10-8K
43
3.0
0.10-20K
45
5.0
0.10-70K
47
7.0
0.10-80K
40
10.0 0.10-150K
Dimensions (in. /
mm)
Length
Diam.
0.437 /
11.1
0.125 /
3.2
0.406 /
10.3
0.219 /
5.6
0.593 /
15.1
0.218 /
5.5
0.937 /
23.8
0.343 /
8.7
1.280 /
32.5
0.343 /
8.7
1.642 /
41.7
0.406 /
10.3
Lead
Voltage ga.
150
24
100
20
200
20
460
18
670
18
1000
18
Non-Inductive versions available. Insert “N” before tolerance code. Example: 42NJ27R
41NJR10E
50K = 50,000Ω
Ohmite 40 Series resistors are the most economical conformal
silicone-ceramic coated resistors offered. These all-welded units
are characterized by their low temperature coefficients and resis-
tance to thermal shock, making them ideal for a wide range of
electrical and electronic applications.
Units with 1% and 5% tolerances are identical in construction
and electrical specifications. Durable but economical 40 Series
resistors exceed industry requirements for quality.
Wattage and Tolerance
1% Tolerance
5% Tolerance
Ohmic value
40J–––
10
40F–––
10
part no.
Prefix
Suffix
–––2K2
–––2K5
–––2K7
–––3K0
–––3K3
–––3K5
–––3K9
–––4K0
–––4K5
–––4K7
–––5K0
–––6K0
–––6K8
–––7K0
–––7K5
–––8K0
–––9K0
–––10K
–––12K
–––13K
–––15K
–––17K
–––20K
–––22K
–––25K
–––30K
–––33K
–––35K
–––40K
–––50K
40J–––
10
41F–––
1
43F–––
3
45F–––
5
41J–––
1
42J–––
2
43J–––
3
45J–––
5
S ta n d a r d pa rt n u m b e r S f o r 4 0 S e r i e S
Wattage and Tolerance
1% Tolerance
5% Tolerance
Ohmic value
Ohmic value
40F–––
10
40J–––
10
41F–––
1
43F–––
3
45F–––
5
41J–––
1
42J–––
2
43J–––
3
45J–––
5
part no.
Prefix
Suffix
–––R10
–––R15
–––R20
–––R25
–––R30
–––R33
–––R40
–––R50
–––R75
–––1R0
–––1R5
–––2R0
–––2R2
–––3R0
–––4R0
–––5R0
–––7R5
–––10R
–––12R
–––15R
–––18R
–––20R
–––22R
–––25R
–––27R
–––30R
–––33R
–––35R
–––39R
–––40R
–––47R
–––50R
–––56R
–––62R
part no.
Prefix
Suffix
–––68R
–––75R
–––82R
–––100
–––120
–––125
–––150
–––180
–––200
–––220
–––225
–––250
–––270
–––300
–––330
–––350
–––390
–––400
–––450
–––470
–––500
–––560
–––600
–––680
–––750
–––800
–––820
–––900
–––1K0
–––1K1
–––1K2
–––1K5
–––1K8
–––2K0
Wattage and Tolerance
1% Tolerance
5% Tolerance
40F–––
10
41F–––
1
43F–––
3
45F–––
5
41J–––
1
42J–––
2
43J–––
3
45J–––
5
0.1
0.15
0.2
0.25
0.3
0.33
0.4
0.5
0.75
1
1.5
2
2.2
3
4
5
7.5
10
12
15
18
20
22
25
27
30
33
35
39
40
47
50
56
62
68
75
82
100
120
125
150
180
200
220
225
250
270
300
330
350
390
400
450
470
500
560
600
680
750
800
820
900
1,000
1,100
1,200
1,500
1,800
2,000
2,200
2,500
2,700
3,000
3,300
3,500
3,900
4,000
4,500
4,700
5,000
6,000
6,800
7,000
7,500
8,000
9,000
10,000
12,000
13,000
15,000
17,000
20,000
22,000
25,000
30,000
33,000
35,000
40,000
50,000
Shaded values
involve very fine
resistance wire
and should not
be used in criti-
cal applications
without burn-in
and/or thermal
cycling.
= Standard values
= Non-standard values subject to mini-
mum handling charge per item
Check product availability at
www.ohmite.com
21
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
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