Overview

Our multi-functional EMI Filters are designed to attenuate unwanted EM interference (commonly referred to as “noise” or “spurious emissions”) at specific frequencies, allowing other frequencies and/or DC signals to pass unaltered. This patented technology can suppress both common mode and differential noise interference with attenuations of up to 70dB.

Applications:

Expert Design Support:

At Johanson, we understand the complexity and difficulty associated in dealing with unwanted EMI issues in your circuit. With this in mind, we have a dedicated team of EMC experts in-house who are ready to support you. Our experienced engineers are here to help solve EMI issues and can support you with:

• Identifying the right component(s) to solve your unwanted EMI spikes.
• How to design-in and connect Johanson EMI Filters to your product’s schematic to achieve the most effective results.
• Reviewing and optimize your PCB layout, and where required, advise on any necessary changes that can be made to improve EM compliance.

Our goal is to provide you with a solution that will reduce your unwanted EMI noise that enables you to pass the mandatory EMC regulations, so please feel free to contact a member of our team.

App Notes & Design Data

App NotesClick to Expand

EMI Filters as Common Mode Best Practices EMI Filters as Common Mode Noise Filters EMI Filters for DC-DC Converters EMI Filter to Replace a Common Mode Choke EMI Filters for Wireless Charging

Mechanical & Electrical DataClick to Expand

Equivalent Circuits

Cross Sectional View

Dimensional View

0402 (EMCF)			0603 (EMCP)		0805 (EMCT)		1206 (EMDD)		1210 (EMFD)		1410 (EMDK)		1812 (EMDR)
IN		mm	IN	mm	IN	mm	IN	mm	IN	mm	IN	mm	IN	mm
L	0.045 ± 0.003	1.143 ± 0.076	0.064 ± 0.005	1.626 ± 0.127	0.080 ± 0.008	2.032 ± 0.203	0.124 ± 0.010	3.150 ± 0.254	0.125 ± 0.010	3.175 ± 0.254	0.140 ± 0.010	3.556 ± 0.254	0.174 ± 0.010	4.420 ± 0.254
W	0.025 ± 0.003	0.635 ± 0.076	0.035 ± 0.005	0.889 ± 0.127	0.050 ± 0.008	1.270 ± 0.203	0.063 ± 0.010	1.600 ± 0.254	0.098 ± 0.010	2.489 ± 0.254	0.098 ± 0.010	2.490 ± 0.254	0.125 ± 0.010	3.175 ± 0.254
T	0.02 max.	0.508 max.	0.26 max.	0.660 max.	0.040 max.	1.016 max.	0.050 max.	1.270 max.	0.070 max.	1.778 max.	0.070 max.	1.778 max.	0.090 max.	2.286 max.
EB	0.008 ± 0.003	0.203 ± 0.076	0.010 ± 0.006	0.254 ± 0.152	0.012 ± 0.008	0.305 ± 0.203	0.016 ± 0.010	0.406 ± 0.254	0.018 ± 0.010	0.457 ± 0.254	0.018 ± 0.010	0.457 ± 0.254	0.022 ± 0.012	0.559 ± 0.305
CB	0.012 ± 0.003	0.305 ± 0.076	0.018 ± 0.004	0.457 ± 0.102	0.022 ± 0.005	0.559 ± 0.127	0.040 ± 0.005	1.016 ± 0.127	0.045 ± 0.005	1.143 ± 0.127	0.045 ± 0.005	1.143 ± 0.127	0.045 ± 0.005	1.143 ± 0.127

Case StudiesClick to Expand

EMI Filter for DC Motor with Brushes Optimized Input Filter for Instrumentation Amplifier

Layout DataClick to Expand

EMI Component & Pad Sizes

Physical Dimensions		0402 (EMCF)		0603 (EMCP)		0805 (EMCT)		1206 (EMDD)		1210 (EMFD)		1410 (EMDK)		1812 (EMDR)
		IN	mm	IN	mm	IN	mm	IN	mm	IN	mm	IN	mm	IN	mm
Chip	L	0.045 ±.003	1.143 ±.076	0.064 ±.005	1.626 ±.127	0.080 ±.008	2.032 ±.203	0.124 ±.010	3.150 ±.254	0.125 ±.010	3.175 ±.010	0.140 ±.010	3.556 ±.254	0.174 ±.010	4.420 ±.254
	W	0.025 ±.003	0.635 ±.076	0.035 ±.005	0.889 ±.127	0.050 ±.008	1.270 ±.203	0.063 ±.010	1.600 ±.254	0.098 ±.010	2.489 ±.254	0.098 ±.010	2.490 ±.254	0.125 ±.010	3.175 ±.254
	T	0.020 max.	0.508 max.	0.026 max.	0.660 max.	0.040 max.	1.016 max.	0.050 max.	1.270 max.	0.070 max.	1.778 max.	0.070 max.	1.778 max.	0.090 max.	2.286 max.
	EB	0.008 ±.003	0.203 ±.076	0.010 ±.006	0.254 ±.152	0.012 ±.008	0.305 ±.203	0.016 ±.010	0.406 ±.254	0.018 ±.010	0.457 ±.254	0.018 ±.010	0.457 ±.254	0.022 ±.012	0.559 ±.305
	CB	0.012 ±.003	0.305 ±.076	0.018 ±.004	0.457 ±.102	0.022 ±.005	0.559 ±.127	0.040 ±.005	1.016 ±.127	0.045 ±.005	1.143 ±.127	0.045 ±.005	1.143 ±.127	0.045 ±.005	1.143 ±.127
Solder Pad	X	0.020	0.51	0.035	0.89	0.050	1.27	0.065	1.65	0.100	2.54	0.100	2.54	0.125	3.18
	Y	0.018	0.45	0.025	0.64	0.035	0.89	0.040	1.02	0.040	1.02	0.040	1.02	0.040	1.02
	G	0.028	0.71	0.040	1.02	0.050	1.27	0.080	2.03	0.080	2.03	0.100	2.54	0.130	3.30
	V	0.013	0.33	0.020	0.51	0.022	0.56	0.040	1.02	0.045	1.14	0.045	1.14	0.045	1.14
	U	0.039	0.99	0.060	1.52	0.080	2.03	0.120	3.05	0.160	4.06	0.160	4.06	0.190	4.83
	Z	0.064	1.63	0.090	2.29	0.120	3.05	0.160	4.06	0.160	4.06	0.180	4.57	0.210	5.33
						Solder mask beneath component should be avoided or minimized to reduce flux & containment entrapment

Trace - Via Layout Summary

The following are key elements of Good Mounting Practice when applying EMI components with traces and vias on the PCB.

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Differential Configuration - Trace & Via Layouts

Examples of circuit Schematic:

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Single-Ended Configuration - Trace & Via Layouts

Examples of circuit Schematic:

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Dual-Line EMI Filtering - Examples 1 & 2

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Dual Line EMI Filtering - Examples 4 & 5

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EMI Filter & Power Bypass - Example 6

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IC Power Bypass: Inner Planes Attachment

Multiple EMI components are attached between the inner Vcc an GND planes on this PCB for FPGA power bypassing.

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IC Power Bypass: Inner Planes Attachment

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IC Power Bypass: Reduced EMC

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We're here to help

Johanson provides first time adopters with application engineering assistance including part selection, schematic design review and PCB layout review.

Contact your Johanson Applications Engineer for more information by clicking here: Ask a Question

Thank You for your interest in our EMI Solutions