Safety Certified AC Capacitors
Knowles Safety Certified capacitors comply with international UL and TÜV
specifications, offering designers the option of using a surface mount
ceramic multilayer capacitor to replace leaded film types.
Offering the benefits of simple pick-and-place assembly, reduced board
space required and a lower profile, they are also available as a FlexiCap™
version to reduce the risk of mechanical cracking.
Our high voltage expertise allows us to offer capacitance ranges that are
among the highest in the market for selected case sizes.
Applications include: modems and other telecoms equipment,
AC/DC power supplies, power distribution switchgear, automotive
applications, and where lightning strikes or other voltage transients
represent a threat to electronic equipment.
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Surface mount multilayer ceramic capacitors
Case sizes 1808, 1812, 2211, 2215 and 2220
Reduced board area and height restrictions
Meet Class Y2, X1 and X2 requirements
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Reduced assembly costs over conventional through hole components
Approved by UL and TÜV
FlexiCap™ polymer termination option available on all sizes
OVERVIEW OF SAFETY CAPACITOR CLASSES
Class
Rated Voltage
Impulse Voltage
Insulation Bridging
May be used in Primary Circuit
Y1
Y2
Y3
Y4
X1
250Vac
250Vac
250Vac
150Vac
250Vac
250Vac
250Vac
8000V
5000V
None
Double or Reinforced
Line to Protective Earth
Line to Protective Earth
-
Basic or Supplementary*
Basic or Supplementary*
2500V
4000V
2500V
None
Basic or Supplementary*
Line to Protective Earth
Line to Line
-
-
-
X2
X3
Line to Line
Line to Line
Note: * 2 x Y2 or Y4 rated may bridge double or reinforced insulation when used in series.
KNOWLES’ SAFETY CERTIFIED AC CAPACITOR RANGES
Knowles offers two Safety Certified capacitor ranges:
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Enhanced 250Vac and 305Vac — our latest range, recommended for new designs
Legacy 250Vac our original range, for existing applications
These ranges are covered on the following pages.
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