AC Line Filters
Earth Inductors, SNG Series
Overview
The KEMET SNG coils are earth inductors with a wide
variety of characteristics. These coils are designed
with our proprietary ferrite cores and are useful noise
countermeasures for ground wires.
Applications
• Industrial equipment
• Home appliances
Benefits
• Proprietary 700L and 5H ferrite material and equivalents
• Ground wire noise suppression
• Wide variety of sizes and specifications
• Operating temperature range from −25°C to +105°C
• UL 94 V–2 flame retardant rated cap
• TÜV approved (for the Mn-Zn ferrite parts)
Part Number System
SNG-
Series
SNG
19
Core Size Code
19
25
D
Core Type
Blank = Mn-Zn ferrite
D = Ni-Zn ferrite
A-
Core Case Type
A = Normal
B = With fixing hole
014
Inductance (µH)
+50%/−30%
0xx = xx µH
xxx = xxx µH
Examples:
014 = 14 µH
600 = 600 µH
One world. One KEMET
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
LF0062_SNG • 6/14/2019
1
AC Line Filters – Earth Inductors, SNG Series
Magnetic Permeability of Ferrite Material
In order to achieve most efficient noise reduction, it is important to select the material according to the target frequency
band.
Depending on its magnetic permeability, a particular ferrite material will be effective in a certain frequency band.
A schematic representation of the relationship between the magnetic permeability of each material and the corresponding
effective band range is shown in Figure 1. Materials with higher magnetic permeability are effective in the lower frequency
range, while those with lower magnetic permeability are effective in the higher frequency range. Thus, Mn-Zn products are
mainly used for reducing conduction noise, while Ni-Zn products are commonly used for radiation noise countermeasures.
The effective frequency range varies depending on core shape, size and number of windings. This frequency dependence
of the magnetic permeability as shown in the figure serves for reference purposes only and it should be tested on the actual
device to determine its effectiveness.
S18H, S15H, 10H, 7H, 5H, 1400L and 700L are KEMET’s proprietary ferrite material names.
Other materials can also be available on request.
Figure 1 - Relationship between the magnetic permeability of each material and its effective frequency range
20,000
Higher magnetic permeability:
Higher noise suppression effect
in the lower frequency range
Mn-Zn Series
S18H
Magnetic Permeability
S15H
10,000
10H
7H
5H
Lower magnetic permeability:
Higher noise suppression effect
in the higher frequency range
Ni-Zn Series
1400L
700L
100 kHz
1 MHz
10 MHz
100 MHz
1 GHz
0
10 kHz
Effective Frequency Range
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
LF0062_SNG • 6/14/2019
2
AC Line Filters – Earth Inductors, SNG Series
Dimensions – Millimeters
SNG-19A-080, SNG-19DA-014
7.0±2.0
250 Maximum
7.0±2.0
SNG-25A-600, SNG-25DA-086
7.0±2.0
250 Maximum
7.0±2.0
(115)
20 Maximum
(115)
30
um
im
ax
M
(113)
24 Maximum
(113)
39
um
im
ax
M
SNG-19B-080, SNG-19DB-014
250 Maximum
(11.3)
7.0±2.0
(6.5)
ø5.1
7.0±2.0
42 Maximum
(3.0)
SNG-25B-600, SNG-25DB-086
250 Maximum
(13)
ø5.1
(6.5)
49 Maximum
39 Maximum
(3.0)
(115)
(20)
(115)
30 Maximum
(113)
(24)
(113)
Environmental Compliance
All KEMET AC Line Filters are RoHS Compliant.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
LF0062_SNG • 6/14/2019
3
AC Line Filters – Earth Inductors, SNG Series
Performance Characteristics
Item
Rated Voltage
Withstanding Voltage
Insulation Resistance
Rated Inductance Range
Inductance Tolerance
Inductance Measurement Condition
Thermal Class
Operating Temperature Range
Approvals
Performance Characteristics
250 VAC/VDC
2,500 VAC (1 minute, between insulation cap and terminal)
> 20 MΩ at 500 VDC (1 minute, between insulation cap and terminal)
14 – 600 µH
+50%, −30%
160 kHz
A (105°C)
−25°C to +105°C (include self temperature rise)
TÜV
Table 1 – Ratings & Part Number Reference
Part Number
SNG-19A-080
SNG-19B-080
SNG-25A-600
SNG-25B-600
SNG-19DA-014
SNG-19DB-014
SNG-25DA-086
SNG-25DB-086
Rated
Voltage
(VAC/VDC)
250
250
250
250
250
250
250
250
Inductance
(µH)
+50%,−30%
80
80
600
600
14
14
86
86
DC Resistance/Line
(mΩ)
Maximum
10
10
20
20
10
10
20
20
Weight
(g)
Approximate
19
19
38
38
20
20
38
38
Approval
TÜV
TÜV
TÜV
TÜV
-
-
-
-
Attenuation & Circuit Diagram
L
1
SW. REG.
EMI/EMC Filter
E
L
2
FG
Earth Inductor
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
LF0062_SNG • 6/14/2019
4
AC Line Filters – Earth Inductors, SNG Series
Frequency Characteristics
1M
100k
SNG-19A-080, SNG-19B-080
1M
100k
SNG-25A-600, SNG-25B-600
Impedance (Ω)
1k
100
10
1
1k
10k
Impedance (Ω)
100k
1M
10M
30M
10k
10k
1k
100
10
1
Frequency (Hz)
1k
10k
Frequency (Hz)
100k
1M
10M
30M
1M
100k
SNG-19DA-014, SNG-19DB-014
1M
100k
SNG-25DA-086, SNG-25DB-086
Impedance (Ω)
1k
100
10
1
1k
10k
Impedance (Ω)
100k
1M
10M
30M
10k
10k
1k
100
10
1
Frequency (Hz)
1k
10k
Frequency (Hz)
100k
1M
10M
30M
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
LF0062_SNG • 6/14/2019
5
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