EMI
Filters
Knowles Capacitors is a global company dedicated to the
manufacture of ceramic based electronic components. Knowles
has been producing Multilayer Ceramic Capacitors for over 25
years and its employees are committed to providing customers
with high quality products together with a fast, friendly and
exible service from a state-of-the-art facility.
Production process
At the core of Knowles’ ceramic manufacturing technology is
the ‘Wet Process’. This fully integrated computer-controlled
manufacturing operation is in a clean room environment, and
oers unique advantages in the manufacture of lter products.
This has resulted in Knowles being a world leader in the
manufacture of EMI lters, discoidal capacitors and planar arrays.
Our multilayer ceramic manufacturing and lter assembly facility
holds a number of internationally recognised approvals including
ISO 9001. Specic product approvals/qualications include IECQ
CECC, UL, TÜV and AEC-Q200.
Products
Knowles’ excellence in ceramic materials technology, combined
with EMI lter expertise, has enabled us to oer an unrivalled
range of EMI lter products including:
l Surface Mount Filters including:
Feedthrough Chip Capacitors
Surface Mount C Filters
Surface Mount Pi Filters
X2Y - Integrated Passive Components
l Solder-in Panel Mount Filters
l Resin Sealed Ceramic Threaded Panel Mount Filters
l Discoidal Capacitors
l Planar Capacitor Arrays
Benets
Surface Mount EMI Filters
l High capacitance, high voltage, high current Pi lters
l FlexiCap™ termination an option
l AEC-Q200 approvals
Panel Mount EMI Filters
l Use of Stable X7R and C0G/NP0 ceramics - no Z5U/Y5V
l High capacitance values, high voltage
l High frequency performance to greater than 10GHz
X2Y
l Available with FlexiCap™ termination
l AEC-Q200 and medical implantable
l Available in surface mount, panel mount and
planar array versions
Discoidal Capacitors
l Small sizes, high capacitance values, high
voltage capability
l Custom sizes available
Planar Arrays
l Mechanical superiority, tighter mechanical tolerances
l High voltage capability, mixed capacitance values
l Available in capacitor and X2Y formats
Multiway Filter Assemblies
l Can use either discoidal capacitor elements or
planar arrays
l Full custom design facility
Other Knowles products
l Multilayer ceramic chip capacitors
l High Voltage MLCCs
l FlexiCap™ Capacitors with exible terminations
l StackiCap™ High CV Capacitors
l Class ‘X’ and ‘Y’ SMD Safety Certied Capacitors
l Radial Leaded Capacitors
l AEC-Q200 approved Capacitors
l IECQ CECC approved Capacitors
l Capacitors for space applications
l High Q Ultra-low ESR Capacitors
l Non-magnetic Capacitors
l High Power Ribbon Leaded
l High Temperature Capacitors
www.knowlescapacitors.com
Introduction to Knowles Capacitors
Introduction to Knowles Capacitors
EMI Filters Quick Reference Guide ......................................................................... 2-3
The need for EMI Filters ...........................................................................................4
Explanation of common terms ...................................................................................5
Insertion Loss/Filtering performance .......................................................................... 6
Choice of ceramic dielectric material ..........................................................................7
Panel mount EMI Filters - Application considerations ................................................... 8
MIL-STD-461 and EMI Filters - Common misconceptions .............................................9
Installation of Filters ......................................................................................... 10-11
Introduction ........................................................................................................... 12
Insertion Loss .................................................................................................. 13-14
3-terminal Feedthrough Capacitors (E01 & E07) ................................................. 15-16
C and Pi Filter ranges ....................................................................................... 17-21
X2Y - Integrated Passive Components (E03) ...................................................... 22-23
Packaging information ...................................................................................... 24-25
Introduction to Panel Mount EMI Filters ...................................................................26
Insertion Loss ........................................................................................................27
Solder-in Panel Mount EMI lters ....................................................................... 28-31
Resin Sealed Ceramic Threaded Panel Mount EMI Filters ..................................... 32-76
Discoidal and Planar Arrays ............................................................................... 77-79
Special Filters and Assemblies .................................................................................80
Filters for Hi-Rel applications ...................................................................................81
Additional Resources ..............................................................................................82
Product Safety Information .....................................................................................83
Contents
General and
Technical
Introduction
SM EMI Filters
Panel Mount
EMI Filters
Discoidals,
Planar Arrays
and Special
Filters
Contents