Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	SC5040F-471 Signal Transformer	FIXED IND 470UH 1.2A 600 MOHM	0
	SCPH73B-120 Signal Transformer	FIXED IND 12UH 1.8A 100 MOHM SMD	0
	SCRH105A-47R Signal Transformer	FIXED IND 4.7UH 7.2A 17 MOHM SMD	0
	SCB73C-2R2 Signal Transformer	FIXED IND 2.2UH 5.3A 28 MOHM SMD	0
	SC32-3R9 Signal Transformer	FIXED IND 3.9UH 1.38A 145 MOHM	0
	SC54B-680 Signal Transformer	FIXED IND 68UH 780MA 460 MOHM	0
	SC52LC-100 Signal Transformer	FIXED IND 10UH 1.44A 150 MOHM	0
	SCRH124-8R2 Signal Transformer	FIXED IND 8.2UH 4.4A 26 MOHM SMD	0
	SCRH2D14-8R2 Signal Transformer	FIXED IND 8.2UH 750MA 294 MOHM	0
	SCRH125B-330 Signal Transformer	FIXED IND 33UH 3.07A 57 MOHM SMD	0
	SC3316C-100 Signal Transformer	FIXED IND 10UH 2.34A 101 MOHM	0
	SC3308F-681 Signal Transformer	FIXED IND 680UH 240MA 5.3 OHM	0
	SC62CB-120 Signal Transformer	FIXED IND 12UH 1.63A 94 MOHM SMD	0
	SC53-180 Signal Transformer	FIXED IND 18UH 1.4A 180 MOHM SMD	0
	SCR105B-470 Signal Transformer	FIXED IND 47UH 1.93A 140 MOHM	0
	SCRH6D38-120 Signal Transformer	FIXED IND 12UH 1.7A 53 MOHM SMD	0
	SCRH127-120 Signal Transformer	FIXED IND 12UH 5.1A 24.3 MOHM	0
	SC108-471 Signal Transformer	FIXED IND 470UH 750MA 880 MOHM	0
	SCPH73-271 Signal Transformer	FIXED IND 270UH 400MA 1.9 OHM	0
	SCRH62B-100 Signal Transformer	FIXED IND 10UH 1.38A 150 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