Fixed Inductors

Part Number	Description / PDF	Quantity
SM2518-1R2MHF ITG Electronics, Inc.	1.2UH, 20%, 6.7MOHM, 18AMP MAX.	0
LQH32MN560K23L TOKO / Murata	FIXED IND 56UH 85MA 4.9 OHM SMD	0
CE201210-10NJ J.W. Miller / Bourns	FIXED IND 10NH 300MA 300MOHM SMD	975
MLG1005S8N2JTD25 TDK Corporation	FIXED IND 8.2NH 500MA 300 MOHM	10760
ASPIAIG-F1040-330M-T Abracon	FIXED IND 33UH 3.5A 112 MOHM SMD	904
ELJ-RF2N2ZFB Panasonic	FIXED IND 2.2NH 400MA 90 MOHM	3545
NLV32T-R39J-PFD TDK Corporation	FIXED IND 390NH 450MA 450 MOHM	0
1468420C Murata Power Solutions	FIXED IND 680UH 2A 300 MOHM TH	359
P1330R-102G API Delevan	FIXED IND 1UH 2.78A 35 MOHM SMD	0
2300LL-3R9-V-RC J.W. Miller / Bourns	FIXED IND 3.9UH 26.3A 2 MOHM TH	0
IMC1812RV1R8J Vishay / Dale	FIXED IND 1.8UH 390MA 650 MOHM	0
ELL-CTV270M Panasonic	FIXED IND 27UH 2.3A 43 MOHM SMD	0
CDR6D23MNNP-330NC Sumida Corporation	FIXED IND 33UH 700MA 275 MOHM	0
1008-101K API Delevan	FIXED IND 100NH 728MA 230 MOHM	0
ISC1812ES820J Vishay / Dale	FIXED IND 82UH 156MA 2.86 OHM	0
2100LL-331-V-RC J.W. Miller / Bourns	FIXED IND 330UH 2.5A 103 MOHM TH	0
0819-04H API Delevan	FIXED IND 150NH 760MA 180 MOHM	0
ISC1812ES151J Vishay / Dale	FIXED IND 150UH 130MA 4.16 OHM	0
AIMC-0603-6N8J-T Abracon	FIXED IND 6.8NH 500MA 220 MOHM	232
P1168.683NLT PulseLarsen Antenna	FIXED IND 68UH 1.5A 202 MOHM 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