Fixed Inductors

Part Number	Description / PDF	Quantity
SRR6028-5R0Y J.W. Miller / Bourns	FIXED IND 5UH 2.4A 36 MOHM SMD	599
LBM2016T390J TAIYO YUDEN	FIXED IND 39UH 120MA 3.9 OHM SMD	661
MLP2016V1R0MT0S1 TDK Corporation	FIXED IND 1UH 1.2A 150 MOHM SMD	4016
0805CS-180EJTS Delta Electronics	FIXED IND 18NH 600MA 200 MOHM	3990
NLCV32T-R15M-PFR TDK Corporation	FIXED IND 150NH 2.6A 28.8 MOHM	4423
AMDLA4020Q-3R3MT Abracon	FIXED IND 3.3UH 3A 55 MOHM SMD	3000
CDRH8D28HPNP-150NC Sumida Corporation	FIXED IND 15UH 1.7A 125 MOHM SMD	0
5022R-821H API Delevan	FIXED IND 820NH 1.3A 220 MOHM	0
S1210R-681G API Delevan	FIXED IND 680NH 590MA 550 MOHM	0
SRR4011-150YL J.W. Miller / Bourns	FIXED IND 15UH 900MA 400MOHM SMD	0
NR8040T4R7N TAIYO YUDEN	FIXED IND 4.7UH 4.1A 23.4 MOHM	8241
AISM-1812-220K-T Abracon	FIXED IND 22UH 180MA 3.2 OHM SMD	0
ASPI-2010HC-100M-T Abracon	FIXED IND 10UH 650MA 826 MOHM	0
NLFV25T-4R7M-EF TDK Corporation	FIXED IND 4.7UH 210MA 290 MOHM	1960
ISC1812EBR39K Vishay / Dale	FIXED IND 390NH 394MA 450 MOHM	0
29333C Murata Power Solutions	FIXED IND 33UH 1A 120 MOHM SMD	443
ISC1210EB82NM Vishay / Dale	FIXED IND 82NH 460MA 450 MOHM	0
HF1008-911G API Delevan	FIXED IND 910NH 270MA 2.05 OHM	0
NLCV32T-101K-PFD TDK Corporation	FIXED IND 100UH 120MA 4.81 OHM	0
195M10 Hammond Manufacturing	FIXED IND 20MH 10A 13 MOHM CHASS	18

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