Fixed Inductors

Part Number	Description / PDF	Quantity
0402HM-150EGTS Delta Electronics	FIXED IND 15NH 460MA 160 MOHM	338
0402HM-910EJTS Delta Electronics	FIXED IND 91NH 125MA 2.38 OHM	8000
0402HM-910EKTS Delta Electronics	FIXED IND 91NH 125MA 2.38OHM SMD	7940
0402HM-7N3EGTS Delta Electronics	FIXED INDUCTOR 7.3NH 570MA SMD	7927
HMLE20161B-1R0MDR Delta Electronics	FIXED IND 1UH 2.7A 58MOHM SMD	3905
0402HM-5N1EJTS Delta Electronics	FIXED IND 5.1NH 600MA 120 MOHM	7980
0805CS-910EKTS Delta Electronics	FIXED IND 91NH 400MA 480 MOHM	3980
VCMT063T-1R5MN5T Delta Electronics	FIXED IND 1.5UH 10.5A 12.5MOHM	3910
0402HM-5N1EKTS Delta Electronics	FIXED IND 5.1NH 600MA 120 MOHM	8000
0805CS-621EGTS Delta Electronics	FIXED IND 620NH 210MA 2.2 OHM	2245
0402HC-1N3EDTS Delta Electronics	FIXED IND 1.3NH 1.2A 17 MOHM SMD	7990
0805CS-182EKTS Delta Electronics	FIXED IND 1.8UH 170MA 2.5 OHM	3978
0402HM-680EGTS Delta Electronics	FIXED IND 68NH 140MA 1.96 OHM	3850
0805CS-102EGTS Delta Electronics	FIXED IND 1UH 170MA 2.5 OHM SMD	3340
0402HP-7N5EHTS Delta Electronics	FIXED IND 7.5NH 1.4A 80 MOHM SMD	7950
0402HS-7N5EGTS Delta Electronics	FIXED IND 7.5NH 680MA 104 MOHM	4000
0402HP-210EGTS Delta Electronics	FIXED IND 21NH 450MA 46 MOHM SMD	7830
0402HP-230EJTS Delta Electronics	FIXED IND 23NH 800MA 160 MOHM	7900
0805CS-330EJTS Delta Electronics	FIXED IND 33NH 500MA 270 MOHM	3885
0402HP-130EHTS Delta Electronics	FIXED IND 13NH 870MA 140MOHM SMD	7900

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