Fixed Inductors

Part Number	Description / PDF	Quantity
SRN3015-3R3M J.W. Miller / Bourns	FIXED IND 3.3UH 1.6A 112MOHM SMD	15970
IFSC1111AZER3R3M01 Vishay / Dale	FIXED IND 3.3UH 1.2A 150 MOHM	0
9250A-332-RC J.W. Miller / Bourns	FIXED IND 3.3UH 480MA 350MOHM TH	0
S1812R-183G API Delevan	FIXED IND 18UH 288MA 2.4 OHM SMD	0
LQG15HH22NG02D TOKO / Murata	FIXED INDUCTOR	0
SCIH1040HC-R68M Signal Transformer	FIXED IND 680NH 22A 2.4 MOHM SMD	0
MLG0603SR18HTD25 TDK Corporation	FIXED IND 180NH 50MA 8.5 OHM SMD	0
IMC1210BN10NM Vishay / Dale	FIXED IND 10NH 734MA 130 MOHM	0
SRU5011-6R8Y J.W. Miller / Bourns	FIXED IND 6.8UH 820MA 130MOHM SM	0
SRR5018-221Y J.W. Miller / Bourns	FIXED IND 220UH 230MA 2.5OHM SMD	940
CLF12555T-1R0N-H TDK Corporation	FIXED IND 1UH 7.3A 6.4 MOHM SMD	360
LQP15MN3N3W02D TOKO / Murata	FIXED IND 3.3NH 190MA 400 MOHM	12619
IHD1EB560L Vishay / Dale	FIXED IND 56UH 1.4A 130 MOHM TH	0
HF1008-390K API Delevan	FIXED IND 39NH 870MA 160 MOHM	0
LQG15WH22NJ02D TOKO / Murata	FIXED IND 22NH 230MA 1.1 OHM SMD	9940
CLF7045T-101M TDK Corporation	FIXED IND 100UH 750MA 396 MOHM	0
PM105SB-271K-RC J.W. Miller / Bourns	FIXED IND 270UH 410MA 870MOHM SM	489
PE-53824SNL PulseLarsen Antenna	FIXED IND 26UH 1.48A 100 MOHM	0
2727-21J API Delevan	FIXED IND 470UH 84MA 27 OHM TH	0
BWVS005050201R0M00 Chilisin Electronics	FIXED IND 1UH 4A 21 MOHM SMD	3868

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