Fixed Inductors

Part Number	Description / PDF	Quantity
ILSB1206ERR15K Vishay / Dale	FIXED IND 150NH 250MA 300 MOHM	0
AMELA2010S-1R0MT Abracon	IND 1UH 3.4A 53MOHM SMD	2900
NLFV32T-220K-EFT TDK Corporation	FIXED IND 22UH 120MA 480 MOHM	0
74451168 Würth Elektronik Midcom	FIXED IND 68UH 400MA 290 MOHM	850
S1812R-333K API Delevan	FIXED IND 33UH 258MA 3 OHM SMD	2015
HCMA1104-100-R PowerStor (Eaton)	FIXED IND 10UH 7.5A 30 MOHM SMD	755
B82475A1224K000 TDK EPCOS	FIXED IND 220UH 660MA 730 MOHM	0
0830CDMCCDS-1R5MC Sumida Corporation	FIXED IND 1.5UH 11.5A 9.4 MOHM	3000
5022R-162J API Delevan	FIXED IND 1.6UH 780MA 600 MOHM	0
LQH32NH330J23L TOKO / Murata	FIXED IND 33UH 175MA 1.368 OHM	1593
DSH-22-0006 Schurter	FIXED INDUCTOR 3.15A 33 MOHM TH	50
5022-431F API Delevan	FIXED IND 430NH 1.825A 110 MOHM	0
78438335047 Würth Elektronik Midcom	FIXED IND 4.7UH 1.5A 162 MOHM	938
MGV04124R7M-10 Laird - Performance Materials	FIXED IND 4.7UH 2A 145MOHM SMD	0
LQP02HQ2N5C02L TOKO / Murata	FIXED IND 2.5NH 450MA 200 MOHM	0
LPS3015-152MRC COILCRAFT	SHIELDED POWER INDUCTORS 1.5H	4329
8532R-50J API Delevan	FIXED IND 12MH 120MA 26 OHM SMD	0
ISC1812EB680K Vishay / Dale	FIXED IND 68UH 164MA 2.6 OHM SMD	0
HCM1103-220-R PowerStor (Eaton)	FIXED IND 22UH 3A 99 MOHM SMD	1298
IHSM3825ER100L Vishay / Dale	FIXED IND 10UH 1.74A 126 MOHM	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