Fixed Inductors

Part Number	Description / PDF	Quantity
0402HP-7N5EGTS Delta Electronics	FIXED IND 7.5NH 1.4A 80 MOHM SMD	2212
0805CS-150EJTS Delta Electronics	FIXED IND 15NH 600MA 170 MOHM	1935
VCHA042A-5R6MS6 Delta Electronics	FIXED IND 5.6UH 3.4A 71.1 MOHM	2000
0805CT-472EJFS Delta Electronics	FIXED IND 4.7UH 400MA 1.9OHM SMD	3453
HMLQ25201T-2R2MSR Delta Electronics	FIXED IND 2.2UH 2.4A 102MOHM SMD	773
0402HP-6N2EJTS Delta Electronics	FIXED IND 6.2NH 1.6A 50 MOHM SMD	7880
0402HM-9N5EKTS Delta Electronics	FIXED IND 9.5NH 540MA 140 MOHM	7991
VCMT104T-470MN5 Delta Electronics	FIXED IND 47UH 3.2A 188MOHM SMD	890
HTEX25201B-100MSR Delta Electronics	FIXED IND 10UH 1.2A 399MOHM SMD	2970
0402HP-400EHTS Delta Electronics	FIXED IND 40NH 450MA 430MOHM SMD	8000
0402HM-470EKTS Delta Electronics	FIXED IND 47NH 210MA 1.08OHM SMD	7940
0402HM-130EKTS Delta Electronics	FIXED IND 13NH 430MA 210MOHM SMD	7945
SDEM25201T-R68MS Delta Electronics	FIXED IND 680NH 3.55A 47MOHM SMD	3880
0402HPH-560EHTS Delta Electronics	FIXED IND 56NH 330MA 900MOHM SMD	7980
0402HS-101EGTS Delta Electronics	FIXED IND 100NH 30MA 2 OHM SMD	7610
0402HM-2N4EKTS Delta Electronics	FIXED IND 2.4NH 850MA 50MOHM SMD	8000
0805CS-6N8EJTS Delta Electronics	FIXED IND 6.8NH 600MA 110 MOHM	3733
HMLQ20161T-1R0MDR Delta Electronics	FIXED IND 1UH 3.2A 59MOHM SMD	4790
0805CS-101EGTS Delta Electronics	FIXED IND 100NH 400MA 46 MOHM	2875
0402HS-7N5EJTS Delta Electronics	FIXED IND 7.5NH 680MA 104 MOHM	6595

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