Fixed Inductors

Part Number	Description / PDF	Quantity
ELJ-FAR39MF2 Panasonic	FIXED IND 390NH 305MA 390 MOHM	1592
DFEH7030D-6R8M=P3 TOKO / Murata	FIXED IND 6.8UH 3.5A 59 MOHM	352
AISC-1008-2R7G-T Abracon	FIXED IND 2.7UH 290MA 3.2 OHM	4263
0402HS-330EJTS Delta Electronics	FIXED IND 33NH 400MA 350 MOHM	7965
ISC1210EB101K Vishay / Dale	FIXED IND 100UH 80MA 12 OHM SMD	0
B78148E1683J000 TDK EPCOS	FIXED IND 68UH 780MA 900 MOHM TH	938
PM4342.151NLT PulseLarsen Antenna	FIXED IND 150NH 43A 0.6 MOHM SMD	0
MHQ1005P1N3STD25 TDK Corporation	FIXED IND 1.3NH 1.2A 30 MOHM SMD	0
WCL2520-560-R PowerStor (Eaton)	FIXED IND 56UH 55MA 6 OHM SMD	0
NRS5010T1R0NMGF TAIYO YUDEN	FIXED IND 1UH 2A 84 MOHM SMD	0
LQW18AN56NG80D TOKO / Murata	FIXED IND 56NH 770MA 260 MOHM	3064
PM2110-470K-RC J.W. Miller / Bourns	FIXED IND 47UH 6.5A 22 MOHM SMD	345
5022-364G API Delevan	FIXED IND 360UH 171MA 12.5 OHM	0
MDMK3030TR47MMV TAIYO YUDEN	FIXED IND 470NH 4.7A 27 MOHM SMD	0
DFEH10040D-100M=P3 TOKO / Murata	FIXED IND 10UH 5.7A 33 MOHM SMD	331
B82144B1226J000 TDK EPCOS	FIXED IND 22MH 40MA 120 OHM TH	0
MLG0603S8N2HT000 TDK Corporation	FIXED IND 8.2NH 200MA 700 MOHM	0
744118 Würth Elektronik Midcom	FIXED IND 600UH 2.2A 330 MOHM TH	0
ISC1210SY27NM Vishay / Dale	FIXED IND 27NH 610MA 170 MOHM	0
FP1007R3-R22-R PowerStor (Eaton)	FIXED IND 215NH 61A 0.29 MOHM	5738

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