Fixed Inductors

Part Number	Description / PDF	Quantity
0402HP-8N7EGTS Delta Electronics	FIXED IND 8.7NH 1.5A 58 MOHM SMD	7747
0402HS-3N6EGTS Delta Electronics	FIXED IND 3.6NH 840MA 66 MOHM	7251
0402HS-470EKTS Delta Electronics	FIXED IND 47NH 150MA 830MOHM SMD	7970
0402HP-8N2EHTS Delta Electronics	FIXED IND 8.2NH 1.5A 58 MOHM SMD	7980
0402HM-510EGTS Delta Electronics	FIXED IND 51NH 210MA 1.08 OHM	7770
0402HS-820EGTS Delta Electronics	FIXED IND 82NH 50MA 1.55 OHM SMD	7940
0402HS-270EJTS Delta Electronics	FIXED IND 27NH 400MA 300 MOHM	7795
HMLQ20161B-1R0MDR Delta Electronics	FIXED IND 1UH 3.4A 55MOHM SMD	2015
0805CS-121EJTS Delta Electronics	FIXED IND 120NH 400MA 510 MOHM	3527
CMLE063T-R15MS0R905 Delta Electronics	FIXED IND 150NH 38A 0.9MOHM SMD	1310
0402HM-6N8EKTS Delta Electronics	FIXED IND 6.8NH 700MA 90MOHM SMD	7990
0402HP-510EHTS Delta Electronics	FIXED IND 51NH 360MA 700MOHM SMD	7990
0805CS-561EJTS Delta Electronics	FIXED IND 560NH 230MA 1.9 OHM	3240
0805CS-472EKTS Delta Electronics	FIXED IND 4.7UH 90MA 6.4 OHM SMD	3945
HMLE20161B-R47MDR Delta Electronics	FIXED IND 470NH 4.2A 35MOHM SMD	3980
0402HS-360EKTS Delta Electronics	FIXED IND 36NH 320MA 440MOHM SMD	8000
0402HM-110EKTS Delta Electronics	FIXED IND 11NH 500MA 140MOHM SMD	7950
VCHA042A-1R5MS6 Delta Electronics	FIXED IND 1.5UH 7.3A 15.4MOHM SM	205
0805CS-601EKTS Delta Electronics	FIXED IND 600NH 450MA 1.6 OHM	3650
0402HS-3N9EKTS Delta Electronics	FIXED IND 3.9NH 840MA 66MOHM SMD	7940

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