Fixed Inductors

Part Number	Description / PDF	Quantity
0805CT-151EGTS Delta Electronics	FIXED IND 150NH 300MA 800 MOHM	3605
0805CS-561EKTS Delta Electronics	FIXED IND 560NH 230MA 1.9 OHM	3990
0805CT-180EJTS Delta Electronics	FIXED IND 18NH 800MA 130MOHM SMD	3865
0805CS-100EJTS Delta Electronics	FIXED IND 10NH 600MA 100 MOHM	3500
HTEH20161T-R47MSR Delta Electronics	FIXED INDUCTOR 0.47UH	2685
SDEM25201T-100MS Delta Electronics	FIXED IND 10UH 950MA 689MOHM SMD	6893
VCHA075D-220MS6 Delta Electronics	FIXED IND 22UH 3.3A 93.5 MOHM	1099
0805CT-390EGTS Delta Electronics	FIXED IND 39NH 600MA 330 MOHM	3566
0402HS-160EGTS Delta Electronics	FIXED IND 16NH 560MA 220MOHM SMD	8000
0402HS-110EKTS Delta Electronics	FIXED IND 11NH 640MA 120MOHM SMD	7990
VCHA075D-3R3MS6 Delta Electronics	FIXED IND 3.3UH 8A 15.4MOHM SMD	517
HMLB25201T-R47MSR Delta Electronics	FIXED IND 470NH 3.95A 32MOHM SMD	4870
0402HM-130EJTS Delta Electronics	FIXED IND 13NH 430MA 210 MOHM	7000
0402HM-7N5EKTS Delta Electronics	FIXED IND 7.5NH 570MA 130 MOHM	7966
0402HP-100EKTS Delta Electronics	FIXED IND 10NH 1.3A 85 MOHM SMD	7987
0402HS-5N6EGTS Delta Electronics	FIXED IND 5.6NH 760MA 83 MOHM	7902
0805CS-251EJTS Delta Electronics	FIXED IND 250NH 350MA 1 OHM SMD	3845
0402HM-200EKTS Delta Electronics	FIXED IND 20NH 370MA 270MOHM SMD	7990
0402HS-101EKTS Delta Electronics	FIXED IND 100NH 30MA 2 OHM SMD	8000
0402HPH-560EJTS Delta Electronics	FIXED IND 56NH 330MA 900MOHM SMD	7775

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