Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	SC31-122 Signal Transformer	FIXED IND 1.2MH 80MA 45.6 OHM	0
	SCRH73-271 Signal Transformer	FIXED IND 270UH 320MA 2.31 OHM	0
	SC1212-561 Signal Transformer	FIXED IND 560UH 190MA 8 OHM SMD	0
	SC54-560 Signal Transformer	FIXED IND 56UH 860MA 420 MOHM	0
	SC2220-101 Signal Transformer	FIXED IND 100UH 520MA 1.2 OHM	0
	SCRH104R-3R3 Signal Transformer	FIXED IND 3.3UH 6.7A 15 MOHM SMD	0
	SC3316F-330 Signal Transformer	FIXED IND 33UH 2.1A 100 MOHM SMD	0
	SC2220-470 Signal Transformer	FIXED IND 47UH 760MA 630 MOHM	0
	SCRH6D28-5R0 Signal Transformer	FIXED IND 5UH 2.4A 31 MOHM SMD	0
	SCH74-470 Signal Transformer	FIXED IND 47UH 1.55A 230 MOHM	0
	SCRH62-7R1 Signal Transformer	FIXED IND 7.1UH 1.53A 110 MOHM	0
	SC3316FH-R27 Signal Transformer	FIXED IND 270NH 17.8A 2 MOHM SMD	0
	SCRH74B-101 Signal Transformer	FIXED IND 100UH 600MA 610 MOHM	0
	SC10F-681 Signal Transformer	FIXED IND 680UH 540MA 1.9 OHM	0
	SCRH127B-470 Signal Transformer	FIXED IND 47UH 2.62A 100 MOHM	0
	SC75B-390 Signal Transformer	FIXED IND 39UH 1.55A 160 MOHM	0
	SCRH64-680 Signal Transformer	FIXED IND 68UH 800MA 630 MOHM	0
	SCIHP0735-R22N Signal Transformer	FIXED IND 220NH 22A 3.1 MOHM SMD	0
	SCRH62B-2R9 Signal Transformer	FIXED IND 2.9UH 2.5A 68 MOHM SMD	0
	SC32-330 Signal Transformer	FIXED IND 33UH 470MA 961 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