AC Line Filters
Earth Inductors, SNG Series
Overview
Applications
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.
• 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-
19
D
A-
014
Series
Core Size Code
Core Type
Core Case Type
Inductance (µH)
+50%/−30%
SNG
19
25
Blank = Mn-Zn ferrite
D = Ni-Zn ferrite
A = Normal
B = With fixing hole
0xx = xx µH
xxx = xxx µH
Examples:
014 = 14 µH
600 = 600 µH
One world. One KEMET
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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
Magnetic Permeability
S18H
S15H
10H
10,000
Lower magnetic permeability:
Higher noise suppression effect
in the higher frequency range
7H
5H
Ni-Zn Series
0
10 kHz
1400L
700L
100 kHz
1 MHz
10 MHz
100 MHz
1 GHz
Effective Frequency Range
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Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
LF0062_SNG • 2/19/2020
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AC Line Filters – Earth Inductors, SNG Series
Dimensions – Millimeters
SNG-19A-080, SNG-19DA-014
SNG-25A-600, SNG-25DA-086
250 Maximum
um
im
ax
M
0
(115)
20 Maximum
3
250 Maximum
(3.0)
(13)
7.0±2.0
ø5.1
42 Maximum
(6.5)
(20)
um
im
ax
M
9
(113)
24 Maximum
(3.0)
(11.3)
(115)
7.0±2.0
SNG-25B-600, SNG-25DB-086
250 Maximum
ø5.1
(113)
3
SNG-19B-080, SNG-19DB-014
7.0±2.0
250 Maximum
7.0±2.0
(115)
30 Maximum
(113)
(24)
49 Maximum
(115)
7.0±2.0
(6.5)
7.0±2.0
(113)
39 Maximum
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 • 2/19/2020
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AC Line Filters – Earth Inductors, SNG Series
Performance Characteristics
Item
Performance Characteristics
Rated Voltage
Withstanding Voltage
Insulation Resistance
Rated Inductance Range
Inductance Tolerance
Inductance Measurement Condition
Thermal Class
Operating Temperature Range
Approvals
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
Rated
Voltage
(VAC/VDC)
Inductance
(µH)
+50%,−30%
DC Resistance/Line
(mΩ)
Maximum
Weight
(g)
Approximate
Approval
SNG-19A-080
SNG-19B-080
SNG-25A-600
SNG-25B-600
SNG-19DA-014
SNG-19DB-014
SNG-25DA-086
SNG-25DB-086
250
250
250
250
250
250
250
250
80
80
600
600
14
14
86
86
10
10
20
20
10
10
20
20
19
19
38
38
20
20
38
38
TÜV
TÜV
TÜV
TÜV
-
Attenuation & Circuit Diagram
L1
SW. REG.
EMI/EMC Filter
E
L2
FG
Earth Inductor
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Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
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AC Line Filters – Earth Inductors, SNG Series
Frequency Characteristics
1M
SNG-19A-080, SNG-19B-080
1M
10k
10k
Impedance (Ω)
100k
Impedance (Ω)
100k
1k
100
10
1k
100
10
1
1
1k
1M
10k
100k
Frequency (Hz)
1M
10M
30M
1k
SNG-19DA-014, SNG-19DB-014
1M
100k
10k
10k
Impedance (Ω)
100k
Impedance (Ω)
SNG-25A-600, SNG-25B-600
1k
100
10
10k
100k
Frequency (Hz)
1M
10M
30M
10M
30M
SNG-25DA-086, SNG-25DB-086
1k
100
10
1
1
1k
10k
100k
Frequency (Hz)
1M
10M
30M
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Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
1k
10k
100k
Frequency (Hz)
1M
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AC Line Filters – Earth Inductors, SNG Series
Packaging
Type
Packaging Type
Pieces Per Box
SNG-19
SNG-25
Bulk
250
Handling Precautions
Precautions for product storage
AC Line Filters should be stored in normal working environments. While the chokes themselves are quite robust in other
environments, solderability will be degraded by exposure to high temperatures, high humidity, corrosive atmospheres, and
long term storage.
KEMET recommends that maximum storage temperature not exceed 40°C and maximum storage humidity not exceed 70%
relative humidity. Atmospheres should be free of chlorine and sulfur bearing compounds. Temperature fluctuations should
be minimized to avoid condensation on the parts. Avoid storage near strong magnetic fields, as this might magnetize the
product.
For optimized solderability, AC line filters stock should be used promptly and preferably within 6 months of receipt.
Product temperature rise values
The values listed for temperature rise are the result of self-heating in wires when the rated current (commercial frequency)
is applied.
When using the product, check and evaluate the value of the core temperature rise under actual operating conditions.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
LF0062_SNG • 2/19/2020
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AC Line Filters – Earth Inductors, SNG Series
KEMET Electronics Corporation Sales Offices
For a complete list of our global sales offi ces, please visit www.kemet.com/sales.
Disclaimer
All product specifi cations, statements, information and data (collectively, the “Information”) in this datasheet are subject to change. The customer is responsible for
checking and verifying the extent to which the Information contained in this publication is applicable to an order at the time the order is placed. All Information given
herein is believed to be accurate and reliable, but it is presented without guarantee, warranty, or responsibility of any kind, expressed or implied.
Statements of suitability for certain applications are based on KEMET Electronics Corporation’s (“KEMET”) knowledge of typical operating conditions for such
applications, but are not intended to constitute – and KEMET specifi cally disclaims – any warranty concerning suitability for a specifi c customer application or use.
The Information is intended for use only by customers who have the requisite experience and capability to determine the correct products for their application. Any
technical advice inferred from this Information or otherwise provided by KEMET with reference to the use of KEMET’s products is given gratis, and KEMET assumes no
obligation or liability for the advice given or results obtained.
Although KEMET designs and manufactures its products to the most stringent quality and safety standards, given the current state of the art, isolated component
failures may still occur. Accordingly, customer applications which require a high degree of reliability or safety should employ suitable designs or other safeguards
(such as installation of protective circuitry or redundancies) in order to ensure that the failure of an electrical component does not result in a risk of personal injury or
property damage.
Although all product–related warnings, cautions and notes must be observed, the customer should not assume that all safety measures are indicted or that other
measures may not be required.
When providing KEMET products and technologies contained herein to other countries, the customer must abide by the procedures and provisions stipulated in all
applicable export laws and regulations, including without limitation the International Traffi c in Arms Regulations (ITAR), the US Export Administration Regulations
(EAR) and the Japan Foreign Exchange and Foreign Trade Act.
KEMET is a registered trademark of KEMET Electronics Corporation.
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