Fixed Inductors

Part Number	Description / PDF	Quantity
0805CS-720EJTS Delta Electronics	FIXED IND 72NH 500MA 400 MOHM	3917
0805CS-561EKFS Delta Electronics	FIXED IND 560NH 550MA 450 MOHM	3598
0402HS-8N2EGTS Delta Electronics	FIXED IND 8.2NH 680MA 104 MOHM	4540
0805CS-220EGTS Delta Electronics	FIXED IND 22NH 500MA 220 MOHM	3898
0402HS-3N3EJTS Delta Electronics	FIXED IND 3.3NH 840MA 66 MOHM	5881
0805CS-222EKTS Delta Electronics	FIXED IND 2.2UH 160MA 2.7 OHM	4031
HTEH20121T-R47MSR Delta Electronics	FIXED IND 470NH 4.6A 25MOHM SMD	0
0402HM-200EJTS Delta Electronics	FIXED IND 20NH 370MA 270 MOHM	7940
0805CS-122EGTS Delta Electronics	FIXED IND 1.2UH 170MA 2.5 OHM	3284
0402HM-2N5EKTS Delta Electronics	FIXED IND 2.5NH 850MA 50MOHM SMD	7382
CML0306-22N-HNH Delta Electronics	FIXED IND 22NH 120MA 2.55 OHM	0
0805CT-150EGTS Delta Electronics	FIXED IND 15NH 800MA 100MOHM SMD	0
0805CS-222EGTS Delta Electronics	FIXED IND 2.2UH 160MA 2.7 OHM	3547
0805CS-111EGTS Delta Electronics	FIXED IND 110NH 400MA 480 MOHM	3410
0402HP-370EHTS Delta Electronics	FIXED IND 37NH 470MA 480MOHM SMD	7800
0805CS-103EJFS Delta Electronics	FIXED IND 10UH 180MA 4.5 OHM SMD	3955
0402HS-3N6EKTS Delta Electronics	FIXED IND 3.6NH 840MA 66MOHM SMD	7890
0805CS-151EKTS Delta Electronics	FIXED IND 150NH 400MA 560 MOHM	3675
SDEM20161T-2R2MS Delta Electronics	FIXED IND 2.2UH 1.8A 159MOHM SMD	3171
HMLE32251B-4R7MS Delta Electronics	FIXED IND 4.7UH SMD	1980

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