Feed Through Capacitors

Part Number	Description / PDF	Quantity
YFF21AC1H221MT0Y0N TDK Corporation	AUTOMOTIVE GRADE FEED THROUGH FI	7430
SFAKL2000103MX1 Syfer	CAP FEEDTHRU 10000PF 200V AXIAL	0
SFBMP500136PMC0 Syfer	CAP FEEDTHRU 136PF 500V AXIAL	0
SFBMC5000330ZC1 Syfer	CAP FEEDTHRU 33PF 500V AXIAL	0
SFABL5000152MX1 Syfer	CAP FEEDTHRU 1500PF 500V AXIAL	0
SFSRC5000470ZC0 Syfer	CAP FEEDTHRU 47PF 500V AXIAL	0
FN7511-100-M8 Schaffner EMC, Inc.	CAP FEEDTHRU 0.1UF 20% 1KV AXIAL	8
SFCDC5000220ZC0 Syfer	CAP FEEDTHRU 22PF 500V AXIAL	0
W3F11A2208AT3A Elco (AVX)	CAP FEEDTHRU 22PF 100V 1206	0
SFCML5000331MC1 Syfer	CAP FEEDTHRU 330PF 500V AXIAL	0
SFCMC5000333MX0 Syfer	CAP FEEDTHRU 0.033UF 500V AXIAL	0
SFABC5000330ZC0 Syfer	CAP FEEDTHRU 33PF 500V AXIAL	0
SFBMC5000332MX1 Syfer	CAP FEEDTHRU 3300PF 500V AXIAL	0
SFCDC2000154MX1 Syfer	CAP FEEDTHRU 0.15UF 200V AXIAL	0
NFM31KC153R2A3L TOKO / Murata	CAP FEEDTHRU 0.015UF 100V 1206	2286
SFBLL5000150ZC0 Syfer	CAP FEEDTHRU 15PF 500V AXIAL	0
SFKBL2000153MX0 Syfer	CAP FEEDTHRU 0.015UF 200V AXIAL	0
SFBMC2000153MX0 Syfer	CAP FEEDTHRU 0.015UF 200V AXIAL	0
SFCDC5000221MC0 Syfer	CAP FEEDTHRU 220PF 500V AXIAL	0
SFAKC5000101MC1 Syfer	CAP FEEDTHRU 100PF 500V AXIAL	0

Feed Through Capacitors

1. Overview

Feed Through Capacitors are specialized passive components designed to suppress high-frequency noise in electronic circuits while allowing DC or low-frequency signals to pass through. They act as electromagnetic interference (EMI) filters by providing a low-impedance path to ground for unwanted high-frequency signals. These capacitors are critical in ensuring signal integrity and compliance with electromagnetic compatibility (EMC) standards across industries such as aerospace, medical devices, and telecommunications.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Ceramic Feed Through Capacitors	High dielectric constant, compact size, wide frequency range (up to GHz)	RF amplifiers, mobile devices
Film Feed Through Capacitors	Self-healing properties, low dielectric loss	Power supplies, industrial motors
Three-Terminal Capacitors	Reduced equivalent series inductance (ESL), improved high-frequency performance	High-speed digital circuits
Multi-Core Feed Through Capacitors	Integrated multiple capacitors in a single package	Medical imaging equipment

3. Structure and Composition

A typical Feed Through Capacitor features a cylindrical ceramic or polymer dielectric body with three terminals: input, output, and ground. The internal structure includes concentric conductive layers separated by dielectric materials. Advanced designs incorporate multi-layer ceramic (MLCC) technology or wound film structures. Key components include:

Dielectric material (e.g., X7R ceramic, polypropylene)
Conductive electrodes (silver, copper, or aluminum)
Hermetically sealed housing for environmental protection
Gold-plated or tin-coated terminals for connectivity

4. Key Technical Specifications

Parameter	Typical Range	Importance
Capacitance	100 pF - 100 F	Determines noise filtering effectiveness
Voltage Rating	50V - 3kV	Ensures safe operation under load
Frequency Range	1 MHz - 10 GHz	Defines applicable signal bandwidth
Insulation Resistance	>10,000 M	Prevents leakage currents
Operating Temperature	-55 C to +150 C	Affects reliability in extreme conditions

5. Application Fields

Key industries and equipment:

Medical: MRI machines, pacemakers, ultrasound scanners
Telecommunications: 5G base stations, satellite transponders
Industrial: CNC machine controllers, motor drives
Aerospace: Avionics systems, radar equipment

Case Study: In MRI systems, Feed Through Capacitors enable artifact-free imaging by eliminating RF interference in gradient coil drivers.

6. Leading Manufacturers and Products

Manufacturer	Product Series	Technical Advantages
Murata	NFM21CC Series	Ultra-low ESL (0.1 nH), 100 MHz - 3 GHz operation
TDK	B32920 Series	High voltage tolerance (2500V), flame-retardant housing
Kemet	CPR21FP Series	Space-grade reliability, operating temp -65 C to +200 C

7. Selection Guidelines

Key considerations:

Determine required capacitance range based on noise frequency spectrum
Select voltage rating exceeding maximum system voltage by 20%
Evaluate thermal management needs for high-current applications
Consider package size constraints (e.g., 0603 vs. 1812)
Verify compliance with standards (e.g., IEC 60384-14)

8. Industry Trends

Future developments include:

Miniaturization: Sub-0402 packages for wearable devices
High-Frequency Optimization: 10+ GHz performance for 6G infrastructure
Integration: System-in-Package (SiP) solutions with embedded filters
Environmental Durability: Automotive-grade capacitors for 150 C+ operation
Material Innovation: Barium titanate nanocomposites for higher capacitance density