Types of Noise Suppression Components | Helpful Trivia For Coil Users

Types of Noise Suppression Components

Capacitor　Varistor　Diode　・・・Inductor

Our company manufactures and sells board-mount (SMD/PIN) type inductor components.

DC Line	Modes of noise	Key product categories	Main applicable frequency range
AV Equipment OA Equipment Digital home appliances White Goods Various power Module	Differential mode	CER/CBE/CVESeries	Conducted Emission:：150kHz～108MHz Radiated Emission：30MHz～
	Differential mode	PRCG4036C PRBG4029C PRBG4036C	Radiated Emission： Hundreds of MHz ～
	Differential mode・Common mode	TDG5629C	Radiated Emission：100MHz～
	Common mode	TDG6029C	Radiated Emission：100MHz～
	Common mode	TQR /TGQR /TJF Series (5～12mm)	Conducted Emission：150kHz～108MHz Radiated Emission：30MHz～

Noise Filter Application Examples

① Class-D Audio（Single）

② Class-D Audio（BTL）

③ Electric mini vehicle

④ Electric mini vehicle

What is EMC?

EMC（Electromagnetic Compatibility）

The design and manufacturing conditions of equipment to ensure electromagnetic compatibility.

Does not become a source of electromagnetic interference
Is not affected by electromagnetic interference
Continues to operate normally even when interference is present (ensures compatibility)

EMI（Electromagnetic Interference）

Emission: The release of unwanted electromagnetic noise from electrical equipment into its surroundings.

Conducted Emission and Radiated Emission

Conducted Emission：Noise emitted through electrical wires or cables
Radiated Emission：Noise emitted through space as electromagnetic waves

Noise Filtering

3MHz		30MHz		100MHz		200MHz		1GHz
	AM		FM		DAB		TV	Mobile Wi-Fi
Filtering limit efficiently achieved using Mn-Zn cores				General filtering limit using Ni-Zn core power inductors with low inductance				Typical range where high impedance can be achieved with single-layer wound Ni-Zn core power inductors
		Common frequency range that can be filtered with power inductors				General limit achievable with large Ni-Zn core single-layer wound power inductors

Requirements for Noise Filter

Impedance: The higher, the better
ＳＲＦ： The higher, the better
Core Loss: The higher, the better
DC resistance: The lower, the better
Temperature Rise: The lower, the better
Magnetic saturation: The higher, the better
Temperature characteristics: It does not matter

※Generally large current or DC with low-frequency is applied.

Trade-off Characteristics of Inductors

Author

The Development Department is responsible for the entire process from inductor design, prototyping, and evaluation to mass production launch.
Based on customer requirements, the team organizes conditions such as performance, size, cost, and reliability, and works to develop optimal products.

Notes

Some of the products listed in this document are no longer in production.
As some time has passed since the article was written, the information provided may still contain outdated content.

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Types of Noise Suppression Components | Helpful Trivia For Coil Users