Fixed Inductors

Part Number	Description / PDF	Quantity
S1210-561K API Delevan	FIXED IND 560NH 619MA 500 MOHM	0
IMC1210BNR56K Vishay / Dale	FIXED IND 560NH 450MA 550 MOHM	0
SRN1060-151M J.W. Miller / Bourns	FIXED IND 150UH 1.25A 300MOHM SM	2750
7444013119150 Würth Elektronik Midcom	FIXED IND 15UH 11A 4.8MOHM TH	5
LQW18AN18NG8ZD TOKO / Murata	FIXED IND 18NH 1.4A 75 MOHM SMD	143
B82496C3221J000 TDK EPCOS	FIXED IND 220NH 110MA 7 OHM SMD	4000
0402DC-82NXGRW COILCRAFT	CERAMIC CHIP INDUCTORS, 82.0NH	10080
5300-25-RC J.W. Miller / Bourns	FIXED IND 100UH 550MA 670MOHM TH	5781
PA4333.681NLT PulseLarsen Antenna	FIXED IND 680NH 9.5A 8.7 MOHM	0
8532-44K API Delevan	FIXED IND 3.9MH 200MA 8.63 OHM	0
MLF2012DR10KTD25 TDK Corporation	FIXED IND 100NH 300MA 150 MOHM	751
IHSM5832ER1R58L Vishay / Dale	FIXED IND 1.8UH 8.6A 13 MOHM SMD	0
701014101 Würth Elektronik Midcom	FIXED IND 10UH 35A 1.1 MOHM SMD	0
VLCF4024T-470MR44-2 TDK Corporation	FIXED IND 47UH 440MA 644 MOHM	590
AMDLA2213S-4R7MT Abracon	IND 4.7UH 34A 2.2MOHM SMD	0
CD30D22HF-221MC Sumida Corporation	FIXED IND 220UH 190MA 5.94 OHM	0
CDRH8D43NP-3R9NC Sumida Corporation	FIXED IND 3.9UH 4.5A 19 MOHM SMD	0
36501J1N6JTDG TE Connectivity AMP Connectors	FIXED IND 1.6NH 700MA 40 MOHM	2227
PM105SB-331K-RC J.W. Miller / Bourns	FIXED IND 330UH 370MA 1.2OHM SMD	1221
1812R-333K API Delevan	FIXED IND 33UH 224MA 4 OHM 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