Fixed Inductors

Part Number	Description / PDF	Quantity
SRP7028A-R82M J.W. Miller / Bourns	FIXED IND 820NH 13A 8 MOHM SMD	0
L0805R100KPWST KEMET	FIXED IND 10UH 100MA 500 MOHM	9355
DR1030-121-R PowerStor (Eaton)	FIXED IND 120UH 800MA 602 MOHM	0
1026-10K API Delevan	FIXED IND 56NH 1.7A 50 MOHM TH	0
LQW15AN4N4B8ZD TOKO / Murata	FIXED IND 4.4NH 1.6A 52 MOHM	4035
AISC-0805-R56G-T Abracon	FIXED IND 560NH 230MA 1.9 OHM	135
ASPIAIG-F4020-R36M-T Abracon	FIXED IND 360NH 14.5A 6.3 MOHM	0
P3519R-105J API Delevan	FIXED IND 1MH 105MA 26.74 OHM	0
PA3288.151HLT PulseLarsen Antenna	FIXED IND 150NH 64A 0.29 MOHM	2423
MLF1608E5R6MTD25 TDK Corporation	FIXED IND 5.6UH 15MA 1.1 OHM SMD	0
22R683C Murata Power Solutions	FIXED IND 68UH 770MA 280 MOHM TH	2464
SDR0906-471KL J.W. Miller / Bourns	FIXED IND 470UH 400MA 1.63OHM SM	783
LQW18AN2N4C8ZD TOKO / Murata	FIXED IND 2.4NH 2.4A 26 MOHM	2208
LTF4022T-3R3N-D TDK Corporation	FIXED IND 3.3UH 2.1A 64 MOHM SMD	249
5022R-221F API Delevan	FIXED IND 220NH 2.58A 55 MOHM	0
SRU8028-680Y J.W. Miller / Bourns	FIXED IND 68UH 850MA 317MOHM SMD	0
AMELA2012S-1R5MT Abracon	IND 1.5UH 2.9A 60MOHM SMD	3000
NLCV25T-R10M-EFRD TDK Corporation	FIXED IND 100NH 1.89A 48 MOHM	1900
LK1608R10M-T TAIYO YUDEN	FIXED IND 100NH 150MA 350 MOHM	0
AMDLA2213Q-330MT Abracon	FIXED IND 33UH 16A 15.4 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