Fixed Inductors

Part Number	Description / PDF	Quantity
VCMT053T-2R2MN5 Delta Electronics	FIXED IND 2.2UH 6.4A 23 MOHM SMD	2172
0805CS-821EKFS Delta Electronics	FIXED IND 820NH 500MA 550 MOHM	1975
VCMT136E-220MN5 Delta Electronics	FIXED IND 22UH 7A 40MOHM SMD	570
0805CS-601EGTS Delta Electronics	FIXED IND 600NH 450MA 1.6 OHM	3603
0805CT-120EKTS Delta Electronics	FIXED IND 12NH 800MA 100MOHM SMD	3991
SDEM20161T-R33MS Delta Electronics	FIXED IND 330NH 4A 32MOHM SMD	4900
HMLQ20161B-R47MDR Delta Electronics	FIXED IND 470NH 5.1A 26MOHM SMD	4027
CML0306-5N1-JNH Delta Electronics	FIXED IND 5.1NH 270MA 500 MOHM	0
0402HP-3N3EJTS Delta Electronics	FIXED IND 3.3NH 1.7A 45 MOHM SMD	7860
0805CS-152EJTS Delta Electronics	FIXED IND 1.5UH 170MA 2.5 OHM	3988
0805CS-3N0EKTS Delta Electronics	FIXED IND 3NH 800MA 60 MOHM SMD	11430
0402HS-430EJTS Delta Electronics	FIXED IND 43NH 100MA 810 MOHM	8000
0805CS-331EKTS Delta Electronics	FIXED IND 330NH 310MA 1.4 OHM	3923
0402HP-390EKTS Delta Electronics	FIXED IND 39NH 450MA 430MOHM SMD	7975
CML0306-10N-JNH Delta Electronics	FIXED IND 10NH 180MA 1.3 OHM SMD	0
0805CS-430EKTS Delta Electronics	FIXED IND 43NH 500MA 340 MOHM	3742
0402HM-4N3EBTS Delta Electronics	FIXED IND 4.3NH 750MA 70 MOHM	7650
HMLQ25201T-1R0MSR Delta Electronics	FIXED IND 1UH 3.7A 53MOHM SMD	3353
SDEM20161T-1R0MS Delta Electronics	FIXED IND 1UH 2.7A 72MOHM SMD	2172
0402HP-210EHTS Delta Electronics	FIXED IND 21NH 450MA 46 MOHM SMD	7880

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