Fixed Inductors

Part Number	Description / PDF	Quantity
PG0702.301NLT PulseLarsen Antenna	FIXED IND 300NH 42.5A 0.68 MOHM	0
74437336056 Würth Elektronik Midcom	FIXED IND 5.6UH 3.3A 63 MOHM SMD	1959
AISC-0603HP-4N3B-T Abracon	FIXED IND 4.3NH 1.5A 45 MOHM SMD	0
S1812R-682H API Delevan	FIXED IND 6.8UH 408MA 1.2 OHM	0
MLG1005S1N0ST000 TDK Corporation	FIXED IND 1NH 1A 100 MOHM SMD	11905
HCM1A2213V2-101-R PowerStor (Eaton)	FIXED IND 100UH 6.4A 39.5 MOHM	0
LQW15AN7N6J8ZD TOKO / Murata	FIXED IND 7.6NH 1.7A 50 MOHM	9499
5022R-562H API Delevan	FIXED IND 5.6UH 1.03A 320 MOHM	0
LQP03TN2N6C02D TOKO / Murata	FIXED IND 2.6NH 500MA 200 MOHM	0
MCLA1005V2-5R6-R PowerStor (Eaton)	FIXED IND 5.6NH 300MA 0.25	0
IHLP4040DZER470M11 Vishay / Dale	FIXED IND 47UH 3.3A 145 MOHM SMD	4503
IHLP5050FDER1R8M51 Vishay / Dale	FIXED IND 1.8UH 26A 2.94 MOHM	0
AIAP-03-560K Abracon	FIXED IND 56UH 3.66A 37 MOHM TH	0
SWT-0.44-252 Amgis	FIXED IND 252UH 440MA 900 MOHM	0
TYA40121R5M-10 Laird - Performance Materials	FIXED IND 1.5UH 2.8A 75 MOHM SMD	17988
MPL-SE5040-1R5 MPS (Monolithic Power Systems)	FIXED IND 1.5UH 6.2A 14 MOHM SMD	890
SDR1006-272KL J.W. Miller / Bourns	FIXED IND 2.7MH 140MA 11.6OHM SM	0
MPLC0730L4R7 KEMET	FIXED IND 4.7UH 5A 41 MOHM SMD	5114
0402HP-300EGTS Delta Electronics	FIXED IND 30NH 450MA 330 MOHM	7095
NRS5020T1R0NMGJ TAIYO YUDEN	FIXED IND 1UH 3.6A 25.2 MOHM SMD	36

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