Fixed Inductors

Part Number	Description / PDF	Quantity
0402HM-560EGTS Delta Electronics	FIXED IND 56NH 200MA 1.17 OHM	6789
0402HP-270EGTS Delta Electronics	FIXED IND 27NH 450MA 275 MOHM	6810
0402HM-6N8EGTS Delta Electronics	FIXED IND 6.8NH 700MA 90 MOHM	7720
0402HM-160EKTS Delta Electronics	FIXED IND 16NH 370MA 240MOHM SMD	8000
0402HS-120EJTS Delta Electronics	FIXED IND 12NH 640MA 120 MOHM	7500
0402HM-750EGTS Delta Electronics	FIXED IND 75NH 135MA 2.1 OHM SMD	7900
0402HS-150EKTS Delta Electronics	FIXED IND 15NH 560MA 172MOHM SMD	7694
0402HS-130EKTS Delta Electronics	FIXED IND 13NH 440MA 210MOHM SMD	7990
0402HM-270EJTS Delta Electronics	FIXED IND 27NH 280MA 520 MOHM	7760
VCHA042A-3R3MS6 Delta Electronics	FIXED IND 3.3UH 4.6A 36.8 MOHM	2005
0402HM-300EJTS Delta Electronics	FIXED IND 30NH 270MA 580 MOHM	7990
0402HP-2N7EDTS Delta Electronics	FIXED IND 2.7NH 1.5A 56 MOHM SMD	1985
0805CS-120EGTS Delta Electronics	FIXED IND 12NH 600MA 150 MOHM	3732
0402HM-2N9EKTS Delta Electronics	FIXED IND 2.9NH 750MA 70MOHM SMD	8000
0402HS-390EKTS Delta Electronics	FIXED IND 39NH 200MA 550MOHM SMD	7825
0402HM-7N0EKTS Delta Electronics	FIXED IND 7NH 570MA 130 MOHM SMD	8000
0402HP-2N4EDTS Delta Electronics	FIXED IND 2.4NH 2A 42 MOHM SMD	7980
0402HP-150EGTS Delta Electronics	FIXED IND 15NH 1.1A 110 MOHM SMD	7549
0402HM-720EKTS Delta Electronics	FIXED IND 72NH 135MA 2.1 OHM SMD	8000
0402HP-510EGTS Delta Electronics	FIXED IND 51NH 360MA 700 MOHM	7850

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