Fixed Inductors

Part Number	Description / PDF	Quantity
HLQ02120HTTR Elco (AVX)	FIXED IND 12NH 110MA 1.1 OHM SMD	0
L04026R8BHNTR Elco (AVX)	FIXED IND 6.8NH 200MA 900 MOHM	9386
L06033R3DGWTR Elco (AVX)	FIXED IND 3.3NH 750MA 80 MOHM	0
AL12A12N5GTR Elco (AVX)	FIXED IND 12.5NH 4A 3.4 MOHM SMD	0
HL02220GTTR Elco (AVX)	FIXED IND 22NH 180MA 1.317 OHM	4045
L0805120JEWTR Elco (AVX)	FIXED IND 12NH 750MA 200 MOHM	0
LMLP06D6N1R8CTAS Elco (AVX)	FIXED IND 1.8UH 3.7A 18MOHM SMD	1456
LMXN0906M220BTAS Elco (AVX)	FIXED IND 22UH 250 MOHM SMD	0
LMLP1011M3R3DTAS Elco (AVX)	FIXED IND 3.3UH 10A 11.8MOHM SMD	370500
LMXS121JM470HTAS Elco (AVX)	FIXED IND 47UH 2.5A 100 MOHM SMD	102
LMLP1011M8R2DTAS Elco (AVX)	FIXED IND 8.2UH 7A 29MOHM SMD	282
LMXS0704M100DTAS Elco (AVX)	FIXED IND 10UH 1A 75 MOHM SMD	436
LMLP13B3M1R2DTAS Elco (AVX)	FIXED IND 1.2UH 30A 2.5MOHM SMD	35
LCCI0402JR10GTAR Elco (AVX)	FIXED IND 100NH 200MA 1.6 OHM	0
HL022R2BTTR Elco (AVX)	FIXED IND 2.2NH 334MA 178 MOHM	0
HL024R7BTTR Elco (AVX)	FIXED IND 4.7NH 294MA 342 MOHM	0
L08051R6CEWTR Elco (AVX)	FIXED IND 1.6NH 600 MOHM SMD	0
LMLP1011M220DTAS Elco (AVX)	FIXED IND 22UH 5A 66MOHM SMD	496500
LCCI0603S2N2GTAR Elco (AVX)	FIXED IND 2.2NH 1A 100 MOHM SMD	0
HLQ02270HTTR Elco (AVX)	FIXED IND 27NH 95MA 2.1 OHM SMD	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