Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	SC0410101KTV TE Connectivity AMP Connectors	FIXED IND 100UH 275MA 2.5 OHM TH	0
	3-2176086-3 TE Connectivity AMP Connectors	FIXED IND 25NH 600MA 230 MOHM	0
	36501J3N6GTDG TE Connectivity AMP Connectors	FIXED IND 3.6NH 700MA 63 MOHM	0
	36502CR82JTDG TE Connectivity AMP Connectors	FIXED IND 820NH 400MA 1.61 OHM	0
	SC10R10KT TE Connectivity AMP Connectors	FIXED IND 100NH 2.06A 55 MOHM TH	0
	SC0914470K TE Connectivity AMP Connectors	FIXED IND 47UH 1.5A 140 MOHM TH	0
	SMT-40-266-18-P TE Connectivity AMP Connectors	FIXED INDUCTOR	0
	3-2176086-0 TE Connectivity AMP Connectors	FIXED IND 22NH 800MA 160 MOHM	0
	SC15R22KT TE Connectivity AMP Connectors	FIXED IND 220NH 2.06A 55 MOHM TH	0
	3639D151N TE Connectivity AMP Connectors	FIXED IND 150UH 900MA 476 MOHM	0
	3615A2R2K TE Connectivity AMP Connectors	FIXED IND 2.2UH 505MA 900 MOHM	0
	36502C18NJTDG TE Connectivity AMP Connectors	FIXED IND 18NH 1A 120 MOHM SMD	0
	36541E7N5JTDG TE Connectivity AMP Connectors	FIXED IND 7.5NH 1.4A 80 MOHM	0
	4-2176086-1 TE Connectivity AMP Connectors	FIXED IND 40NH 450MA 430 MOHM	0
	SC0912220K TE Connectivity AMP Connectors	FIXED IND 22UH 1.4A 86 MOHM TH	0
	36501E4N7GTDG TE Connectivity AMP Connectors	FIXED IND 4.7NH 640MA 130 MOHM	0
	3631B470LT TE Connectivity AMP Connectors	FIXED IND 47UH 1.6A 130 MOHM SMD	0
	7-1676961-7 TE Connectivity AMP Connectors	FIXED IND 1MH 300MA 4.8 OHM SMD	0
	3639B100NT TE Connectivity AMP Connectors	FIXED IND 10UH 3.5A 40 MOHM SMD	0
	36541E3N3JTDG TE Connectivity AMP Connectors	FIXED IND 3.3NH 1.7A 45 MOHM	0

Fixed Inductors

1. Overview

Fixed inductors are passive electronic components designed to store energy in magnetic fields when electrical current flows through them. Unlike variable inductors, their inductance values remain constant during operation. These components play critical roles in filtering, signal processing, energy storage, and electromagnetic interference (EMI) suppression across modern electronics, including power supplies, communication systems, and automotive electronics.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Wirewound Inductors	High precision, high current handling, low resistance	Power supplies, DC-DC converters
Chip Inductors	Compact SMD package, stable performance at high frequencies	Mobile devices, RF circuits
Ferrite Bead Inductors	Effective high-frequency noise suppression	EMI filtering in digital circuits
Thin-Film Inductors	Ultra-compact, high Q-factor, tight tolerance	5G communication modules, IoT devices

3. Structure and Composition

Typical fixed inductors consist of:

Magnetic Core: Made from ferrite, powdered iron, or composite materials to concentrate magnetic flux
Coil Structure: Copper wire wound around the core (enamelled or silver-plated)
Encapsulation: Molded resin or ceramic coating for mechanical protection and insulation
Terminations: Solder-coated ends for PCB mounting (for SMD types) or leaded connections

4. Key Technical Specifications

Parameter	Description	Importance
Inductance (L)	Measured in henrys (H), determines energy storage capacity	Defines filtering/energy storage performance
Rated Current (I_rated)	Maximum DC current before saturation	Prevents core saturation and failure
DC Resistance (DCR)	Resistance of coil windings	Affects efficiency and thermal performance
Self-Resonant Frequency (SRF)	Frequency where inductor behaves as capacitor	Limits effective operating frequency range
Q Factor	Quality factor indicating efficiency	Higher Q = lower energy losses

5. Application Fields

Consumer Electronics: Smartphones, laptops, LED drivers
Industrial Equipment: Motor drives, power inverters
Automotive Systems: ECU modules, EV battery management
Telecom Infrastructure: Base station filters, optical transceivers

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Murata	LQH3NPN100M	10 H, 1.2A, 1.8 1.4mm chip inductor
TDK	MLZ2012A100T	100MHz SRF, 1.0 1.25mm for RF circuits
Vishay	IHLP2525CZER1R0M	1 H, 12A, composite construction
Coilcraft	0402DC-103J	10 H, 5% tolerance, ultra-low profile

7. Selection Guidelines

Key considerations during selection:

Calculate required inductance based on switching frequency and ripple current
Verify rated current exceeds maximum operating current by 20-30%
Select SRF higher than circuit operating frequency
Consider package size vs. thermal dissipation requirements
For EMI suppression: Choose ferrite beads with impedance curves matching target frequencies

8. Industry Trends

Current development trends include:

Miniaturization: Sub-0.5mm size inductors for wearable devices
High-Frequency Operation: Components supporting >10GHz 5G applications
Integrated Solutions: Combined inductor-filter modules
Material Innovation: Nanocrystalline cores for higher saturation flux
Automotive Focus: AEC-Q qualified parts for EV/HEV systems