Fixed Inductors

Part Number	Description / PDF	Quantity
36401E2N2ATDF TE Connectivity AMP Connectors	FIXED IND 2.2NH 440MA 350 MOHM	0
AX97-10100 Triad Magnetics	FIXED IND 10UH 1A 220 MOHM SMD	5001500
SPM5012T-3R3M-LR TDK Corporation	FIXED IND 3.3UH 2.5A 110 MOHM	834
LMLP06D6N1R3CTAS Elco (AVX)	FIXED IND 1.3UH 4A 16 MOHM SMD	0
LQH43NN5R6M03L TOKO / Murata	FIXED IND 5.6UH 500MA 470 MOHM	0
SRR1050A-330Y J.W. Miller / Bourns	FIXED IND 33UH 2.5A 93 MOHM SMD	2310
IMC1210ER47NJ Vishay / Dale	FIXED IND 47NH 483MA 300 MOHM	0
PA4341.182NLT PulseLarsen Antenna	FIXED IND 1.8UH 8.5A 17 MOHM SMD	0
0819-46G API Delevan	FIXED IND 8.2UH 104MA 4.4 OHM TH	0
LQP03TN3N5C02D TOKO / Murata	FIXED IND 3.5NH 450MA 250 MOHM	0
LQG15WZ3N9S02D TOKO / Murata	FIXED IND 3.9NH 900MA 90 MOHM	9114
LQH32CH100K23L TOKO / Murata	FIXED IND 10UH 300MA 440 MOHM	0
0819-16J API Delevan	FIXED IND 470NH 410MA 620 MOHM	0
IHLM2525CZER2R2M01 Vishay / Dale	FIXED IND 2.2UH 8A 20 MOHM SMD	3380
MLG0603P6N2JT000 TDK Corporation	FIXED IND 6.2NH 300MA 700 MOHM	0
7447773100 Würth Elektronik Midcom	FIXED IND 10UH 2.6A 45 MOHM SMD	412
LHL10NB124J TAIYO YUDEN	FIXED IND 120MH 30MA 260 OHM TH	0
ASPI-6045S-470M-T Abracon	FIXED IND 47UH 1.2A 200 MOHM SMD	1231
IMC1812RV560J Vishay / Dale	FIXED IND 56UH 135MA 5.5 OHM SMD	0
0512CDMCCDS-R22MC Sumida Corporation	FIXED IND 220NH 10.6A 8.4MOHM SM	3989

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