Fixed Inductors

Part Number	Description / PDF	Quantity
AIRD-02-561K Abracon	FIXED IND 560UH 1.6A 388 MOHM TH	876
SRP2510A-R22M J.W. Miller / Bourns	FIXED IND 220NH 5.9A 12.5MOHM SM	43
MLP2520S3R3ST0S1 TDK Corporation	FIXED IND 3.3UH 1A 143 MOHM SMD	689
B82473A1224K000 TDK EPCOS	FIXED IND 220UH 490MA 960 MOHM	0
1210R-333F API Delevan	FIXED IND 33UH 182MA 5.6 OHM SMD	0
0402HM-7N3EDTS Delta Electronics	FIXED INDUCTOR 7.3NH 570MA SMD	8000
B82422H1223K000 TDK EPCOS	FIXED IND 22UH 330MA 1 OHM SMD	17879
AIMC-0402HQ-5N8C-T Abracon	FIXED IND 5.8NH 600MA 130 MOHM	0
SP1210R-154G API Delevan	FIXED IND 150UH 124MA 13.5 OHM	0
744770247W Würth Elektronik Midcom	FIXED IND 470UH 900MA 980 MOHM	0
B82477P2105M000 TDK EPCOS	FIXED IND 1MH 530MA 1.3 OHM SMD	1133
0805CS-201EKTS Delta Electronics	FIXED IND 200NH 400MA 660 MOHM	3995
MLG0402Q22NHT000 TDK Corporation	FIXED IND 22NH 130MA 3.2 OHM SMD	0
AMPLA1306S-5R6MT Abracon	FIXED IND 5.6UH 12.5A 10 MOHM	0
ASMCI-0805-4R7M-T Abracon	FIXED IND 4.7UH 180MA 300 MOHM	11985
2200HT-4R7-V-RC J.W. Miller / Bourns	FIXED IND 4.7UH 16.9A 6 MOHM TH	0
ASPI-2512-1R0N-T2 Abracon	FIXED IND 1UH 1.7A 73 MOHM SMD	0
SDR1305-470M J.W. Miller / Bourns	FIXED IND 47UH 1.9A 130 MOHM SMD	0
IHLP2020CZERR68M5A Vishay / Dale	FIXED IND 0.68 UH 11.3 A 9.74 MO	0
103-271J API Delevan	FIXED IND 270NH 650MA 230 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