Fixed Inductors

Part Number	Description / PDF	Quantity
0402HS-720EGTS Delta Electronics	FIXED IND 72NH 100MA 1.12OHM SMD	7970
0805CS-152EJFS Delta Electronics	FIXED IND 1.5UH 350MA 1.05 OHM	2290
0402HC-3N3EDTS Delta Electronics	FIXED IND 3.3NH 900MA 40 MOHM	2340
0402HP-5N1EKTS Delta Electronics	FIXED IND 5.1NH 1.2A 100MOHM SMD	8000
0402HP-3N9EJTS Delta Electronics	FIXED IND 3.9NH 1.7A 45 MOHM SMD	3851
0402HP-4N7EKTS Delta Electronics	FIXED IND 4.7NH 1.5A 60 MOHM SMD	7990
0805CS-241EGTS Delta Electronics	FIXED IND 240NH 350MA 1 OHM SMD	3637
0402HP-190EHTS Delta Electronics	FIXED IND 19NH 850MA 145MOHM SMD	7950
0805CS-151EJFS Delta Electronics	FIXED IND 150NH 1.1A 180MOHM SMD	3715
0402HM-620EGTS Delta Electronics	FIXED IND 62NH 145MA 1.82 OHM	3868
0402HS-330EKTS Delta Electronics	FIXED IND 33NH 400MA 350MOHM SMD	7950
0402HM-5N8EDTS Delta Electronics	FIXED IND 5.8NH 700MA 120 MOHM	7972
VCMT053T-4R7MN5 Delta Electronics	FIXED IND 4.7UH 4.4A 59MOHM SMD	2720
HMLE20161T-R47MDR Delta Electronics	FIXED IND 470NH 3.8A 39MOHM SMD	3985
VCMT053T-1R0MN5 Delta Electronics	FIXED IND 1UH 10.3A 11.5MOHM SMD	1890
CMLE063T-2R2MS Delta Electronics	FIXED IND 2.2UH 10A 12.8MOHM SMD	980
0402HS-680EJTS Delta Electronics	FIXED IND 68NH 100MA 1.12 OHM	6564
HMLQ25201T-R47MSR Delta Electronics	FIXED IND 470NH 4.3A 25MOHM SMD	4726
0402HM-230EJTS Delta Electronics	FIXED IND 23NH 310MA 300 MOHM	7000
0402HP-260EGTS Delta Electronics	FIXED IND 26NH 450MA 275 MOHM	7980

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