Fixed Inductors

Part Number	Description / PDF	Quantity
LQW18AN24NJ80D TOKO / Murata	FIXED IND 24NH 1.3A 86 MOHM SMD	0
SRR1050A-181Y J.W. Miller / Bourns	FIXED IND 180UH 1A 420 MOHM SMD	0
744776133 Würth Elektronik Midcom	FIXED IND 33UH 1.78A 120 MOHM	1143
RLB0913-123K J.W. Miller / Bourns	FIXED IND 12MH 115MA 33 OHM TH	448
VLS5045EX-100M-H TDK Corporation	FIXED IND 10UH 2.5A 79.3 MOHM	5962
LQW15AN2N7B80D TOKO / Murata	FIXED IND 2.7NH 1.5A 47 MOHM SMD	0
NLV32T-018J-EF TDK Corporation	FIXED IND 18NH 450MA 180 MOHM	1359
28225C Murata Power Solutions	FIXED IND 2.2MH 350MA 3.72 OHM	315
6000-271K-RC J.W. Miller / Bourns	FIXED IND 270UH 900MA 750MOHM TH	490
MHQ0402PSA4N2BT000 TDK Corporation	FIXED IND 4.2NH 200MA 800 MOHM	15337
P1812R-822K API Delevan	FIXED IND 8.2UH 600MA 548 MOHM	0
ATCA-08-471M-H Abracon	FIXED IND 470UH 7A 64 MOHM TH	383
PA5432.103NLT PulseLarsen Antenna	IND COMPOSITE 6060 10UH 7.0A	0
LQG15HN1N0C02D TOKO / Murata	FIXED IND 1NH 1A 70 MOHM SMD	8331
MLF1608DR27JTD25 TDK Corporation	FIXED IND 270NH 150MA 600 MOHM	1147
P1166.223NLT PulseLarsen Antenna	FIXED IND 22UH 1.2A 126 MOHM SMD	0
78438334047 Würth Elektronik Midcom	FIXED IND 4.7UH 1.1A 307.8 MOHM	0
SDE0604A-5R6M J.W. Miller / Bourns	FIXED IND 5.6UH 3.2A 75 MOHM SMD	4863
DRA124-330-R PowerStor (Eaton)	FIXED IND 33UH 1.98A 108 MOHM	0
IFSC1111ABER2R2M01 Vishay / Dale	FIXED IND 2.2UH 1.9A 98 MOHM SMD	11313

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