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About X and Y EMI Suppressors

A capacitor for Electromagnetic Interference Suppression must be approved by a relevant authority either as a electromagnetic interference capacitor or as part of a complete unit of equipment. The standards for EMI capacitors are EN/IEC 60384-14:2005. The capacitors are subdivided into two groups, X and Y.

X capacitors are for use in positions where a failure of the capacitor would not expose anybody to danger of electric shock.

  • ≤2.5kV
  • IEC 60664 installation category II
  • general application purpose

Y capacitors are for use in positions where a failure of the capacitor could expose somebody to dangerous electric shock.

  • Y1 - Double insulation or reinforced insulation, rated voltage ≤500 V, peak impulse voltage before endurance test 8.0kV
  • Y2 - Basic insulation or supplementary insulation, rated voltage ≥150 V, ≤300V, peak impulse voltage before endurance test 5.0kV

Note: A short circuit of a Y capacitor, or a too high capacitance, is hazardous if the earth line should be open circuit or connected to earth through a too high resistance. The National Approval Boards stipulate the maximum permitted current towards earth for different applications. A frequent current value for household equipment and portable tools is ≤0.5mA. For more information, read the technical/application data from the printed catalog.

NEW! Engineering Kit for
X and Y EMI Suppressor Capacitors

FLPENGKIT151

Kit Contains these X and Y Capacitors:
Part Number Pieces
Agency Class Cap. Value Rated AC Voltage Pitch
mm
PHE840MK5100MK01 20 X2 10nF±20% 275(UL 280) 7.5
PHE840MA5100MA01 20 X2 10nF±20% 275(UL 280) 10
PHE840MK5220MK03 20 X2 22nF±20% 275(UL 280) 7.5
PHE840MA5220MA01 20 X2 22nF±20% 275(UL 280) 10
PHE840MK5330MK03 20 X2 33nF±20% 275(UL 280) 7.5
PHE840MA5330MA01 20 X2 33nF±20% 275(UL 280) 10
PHE840MA5470MA02 20 X2 47nF±20% 275(UL 280) 10
PHE840MB6100MB05 20 X2 100nF±20% 275(UL 280) 15
PHE840MX6220MB06 10 X2 220nF±20% 275(UL 280) 15
PHE840MY6680MD15 6 X2 680nF±20% 275(UL 280) 22.5
PHE840MY7100MD16 6 X2 1.0uF±20% 275(UL 280) 22.5
PHE840MZ7100MF11 4 X2 1.0uF±20% 275(UL 280) 27.5
PHE840MZ7220MF14 3 X2 2.2uF±20% 275(UL 280) 27.5
PHE850EA4100MA06 20 Y2 1.0nF±20% 300 10
PHE850EA4220MA01 20 Y2 2.2nF±20% 300 10
PHE850EA4330MA02 20 Y2 3.3nF±20% 300 10
PHE850EA4470MA03 20 Y2 4.7nF±20% 300 10
PHE850EB5100MB04 20 Y2 10nF±20% 300 15
PHE850EB5470MB14 10 Y2 47nF±20% 300 15
PHE850ED6100MD18 6 Y2 100nF±20% 300 22.5
PHE850ED6220MD20 6 Y2 220nF±20% 300 22.5

X Capacitors
View Products List
Series
Datasheets Operating Voltage Class Max Temp ºC C-value Min. C-value Max. Dielectric Self healing? Comments
PME271M
 275 VAC X2 110 0.001µF 0.6µF Impreg. paper Yes Excellent flame resistance
PHE840M
 275/280 VAC
 X2 105 0.01µF 10µF Polyprop. Yes Small size, cost effective, meets agency flammability requirements
PME264N
 660 VAC
 X2 85 0.001µF 0.1µF Impreg. paper
 Yes Excellent flame resistance
R46
 275/300 VAC
 X2 105 0.01µF 10µF Polyprop. Yes Small size, cost effective, meets agency flammability requirements
PME271E 300 VAC
X1
110 0.1µF0.22µFMetallized paper
Yes
For worldwide use as an electromagnetic interference suppressor
PHE820E/M 275 VAC
X2100
0.01µF2.2µFMetallized polyester
-
Interference suppressor in X2 and across-the-line apps
R46+R 275/300 VAC
X2
110
0.22µF10µFMetallized polyprop. film
-
With internal discharge resistor, for EMI interference suppression
PME278 440 VAC
X1
110
0.01µF0.15µFMultilayer metallized paper
Yes
Encapsulated and impregnated in self-extinguishing material meeting UL 94V-0
R47 440 VAC
X2
110
4700pF
2.2µFPolyprop. film
Yes
For interference suppression and across-the-line apps
PHE840E 300 VAC
X2
1050.01µF10 µFMetallized polyprop.
-
Small dimensions including low profile
PHE841 330 VAC
X1
1000.01µF2.2µFMetallized polyprop.
-
Encapsulated in self-extinguishing material meeting UL 94 V-0
PHE844 440/480 VAC
X1
1050.1µF2.2µFMetallized polyprop.
-
For worldwide use as electromagnetic interference suppessors
PHE845 760/600 VAC
X1
105
0.01µF1.0µFMetallized polyprop.
-
For worldwide use as electromagnetic interference suppessors

Y Capacitors
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Series
Datasheets
 Operating Voltage
 Class Max Temp ºC
 C-value Min.
C-value Max.
Dielectric
Self healing?
Comments
PME271Y
 250 VAC
 Y2 100 0.001µF 0.1µF Impreg. paper
 Yes Excellent flame resistance and high self healing voltage
PME271YA-3
 300 VAC
 Y2 115 0.001µF 0.15µF Impreg. paper
 Yes Excellent flame resistance and high self healing voltage
PHE850 300/480 VAC
 Y2 110 0.01µF 1.0µF Polyprop. Yes Cost effective, meets agency flammability requirements
PME295
 440/480 VAC
 Y1 115 470pF 4700pF Impreg. paper
 Yes Excellent flame resistance and high self healing voltage
R41 300/480 VAC Y2 110 0.01µF 1.0µF Polyprop. Yes Cost effective, meets agency flammability requirements
SMP253 250 VAC
Y21000.001uF0.0047uFMetallized Paper
YesFor worldwide use as electromagnetic interference suppressor (EMI), line-to-earth


  • KEMET
  • Passive Components|Capacitors