Fixed Inductors

Part Number	Description / PDF	Quantity
0402HP-6N8EJTS Delta Electronics	FIXED IND 6.8NH 1.5A 55 MOHM SMD	7860
0402HC-2N2EDTS Delta Electronics	FIXED IND 2.2NH 1A 27 MOHM SMD	0
0805CS-181EGTS Delta Electronics	FIXED IND 180NH 400MA 640 MOHM	1533
0805CS-271EJFS Delta Electronics	FIXED IND 270NH 700MA 300 MOHM	3850
0805CT-6N8EJTS Delta Electronics	FIXED IND 6.8NH 800MA 80 MOHM	3995
0402HC-3N9ECTS Delta Electronics	FIXED IND 3.9NH 900MA 40 MOHM	5709
CMLE063T-R12MS0R657 Delta Electronics	FIXED IND 120NH 40A 0.65MOHM SMD	1028
0402HM-360EGTS Delta Electronics	FIXED IND 36NH 260MA 630 MOHM	3700
0805CT-330EJTS Delta Electronics	FIXED IND 33NH 600MA 280 MOHM	3865
0805CT-180EKTS Delta Electronics	FIXED IND 18NH 800MA 130MOHM SMD	3985
0402HC-3N3ECTS Delta Electronics	FIXED IND 3.3NH 900MA 40 MOHM	745
0402HP-190EJTS Delta Electronics	FIXED IND 19NH 850MA 145 MOHM	7900
0402HS-390EGTS Delta Electronics	FIXED IND 39NH 200MA 550 MOHM	3419
VCMT053T-3R3MN5 Delta Electronics	FIXED IND 3.3UH 5.5A 38MOHM SMD	957
0805CS-102EJTS Delta Electronics	FIXED IND 1UH 170MA 2.5 OHM SMD	3510
0402HP-3N9EDTS Delta Electronics	FIXED IND 3.9NH 1.7A 45 MOHM SMD	7986
0805CS-471EGTS Delta Electronics	FIXED IND 470NH 250MA 1.7 OHM	0
0805CS-120EKTS Delta Electronics	FIXED IND 12NH 600MA 150 MOHM	3840
0402HP-110EHTS Delta Electronics	FIXED IND 11NH 1.4A 65 MOHM SMD	7880
VCMT063T-1R0MN5T Delta Electronics	FIXED IND 1UH 13A 7.8MOHM SMD	0

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