Fixed Inductors

Part Number	Description / PDF	Quantity
MDH10060C-680MA=P3 TOKO / Murata	FIXED IND 68UH 1.7A 91MOHM SMD	323
LQW2BASR33J00L TOKO / Murata	FIXED IND 330NH 310MA 1.4 OHM	60388
IHLP5050CEER1R5M07 Vishay / Dale	FIXED IND 1.5UH 19A 4.97 MOHM	0
CBC2012T100K TAIYO YUDEN	FIXED IND 10UH 340MA 1.56 OHM	2604
HCM1A1307-150-R PowerStor (Eaton)	FIXED IND 15UH 5.5A 25MOHM SMD	0
IMC1812BN150K Vishay / Dale	FIXED IND 15UH 200MA 2.5 OHM SMD	0
MCLA3216V1-2R2-R PowerStor (Eaton)	FIXED IND 2.2UH 50MA 500 MOHM	973
PM7232S-R10M-RC J.W. Miller / Bourns	FIXED IND 100NH 32.5A 1.7MOHM SM	0
MLF2012E5R6KTD25 TDK Corporation	FIXED IND 5.6UH 15MA 600 MOHM	0
PA4344.472NLT PulseLarsen Antenna	FIXED IND 4.7UH 25A 5.5 MOHM SMD	0
IHLP3232DZER6R8M11 Vishay / Dale	FIXED IND 6.8UH 7A 33.4 MOHM SMD	8982
PA4334.183NLT PulseLarsen Antenna	FIXED IND 18UH 580MA 709 MOHM	0
744765118A Würth Elektronik Midcom	FIXED IND 18NH 420MA 230 MOHM	2316
MHQ1005P1N3BTD25 TDK Corporation	FIXED IND 1.3NH 1.2A 30 MOHM SMD	0
MLK1005S18NJT000 TDK Corporation	FIXED IND 18NH 250MA 600 MOHM	17406
7447669118 Würth Elektronik Midcom	FIXED IND 18UH 700MA 680 MOHM	85
MGV0605R56M-10 Laird - Performance Materials	FIXED IND 560NH 20A 3.6 MOHM SMD	440
PM124SH-121M-RC J.W. Miller / Bourns	FIXED IND 120UH 1.2A 370MOHM SMD	0
CW252016-R33J J.W. Miller / Bourns	FIXED IND 330NH 500MA 1.05OHM SM	7631
LMLP06C6N3R0CTAS Elco (AVX)	FIXED IND 3UH 3.4A 23 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