Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	SCRH62B-270 Signal Transformer	FIXED IND 27UH 890MA 380 MOHM	0
	SCEP147S-R40 Signal Transformer	FIXED IND 400NH 23A 2.1 MOHM SMD	0
	SCB73C-220 Signal Transformer	FIXED IND 22UH 1.63A 150 MOHM	0
	SCRH105-120 Signal Transformer	FIXED IND 12UH 2.61A 78 MOHM SMD	0
	SCRH127B-390 Signal Transformer	FIXED IND 39UH 2.91A 72.9 MOHM	0
	SCH74-471 Signal Transformer	FIXED IND 470UH 440MA 2.39 OHM	0
	SCMD4D12-4R7 Signal Transformer	FIXED IND 4.7UH 1.15A 250 MOHM	0
	SCRH2D14-1R5 Signal Transformer	FIXED IND 1.5UH 1.6A 71 MOHM SMD	0
	SCIHP0718-3R3M Signal Transformer	FIXED IND 3.3UH 3.25A 60.1 MOHM	0
	SC4020FH-680 Signal Transformer	FIXED IND 68UH 1.9A 185 MOHM SMD	0
	SCRH125B-221 Signal Transformer	FIXED IND 220UH 1.29A 400 MOHM	0
	SCRH8D43-101 Signal Transformer	FIXED IND 100UH 900MA 360 MOHM	0
	SC52-560 Signal Transformer	FIXED IND 56UH 540MA 1.02 OHM	0
	SC1608F-221 Signal Transformer	FIXED IND 220UH 270MA 3.6 OHM	0
	SC2220-472 Signal Transformer	FIXED IND 4.7MH 70MA 61.04 OHM	0
	SC43B-330 Signal Transformer	FIXED IND 33UH 740MA 540 MOHM	0
	SCRH3D16A-4R7 Signal Transformer	FIXED IND 4.7UH 1.41A 105 MOHM	0
	SCRH104-331 Signal Transformer	FIXED IND 330UH 540MA 1.37 OHM	0
	SC54B-820 Signal Transformer	FIXED IND 82UH 700MA 600 MOHM	0
	SC1606-471 Signal Transformer	FIXED IND 470UH 140MA 12.6 OHM	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