Fixed Inductors

Part Number	Description / PDF	Quantity
IHLP2020BZERR33M01 Vishay / Dale	FIXED IND 330NH 12A 8.2 MOHM SMD	1939
ISC1812ESR68M Vishay / Dale	FIXED IND 680NH 296MA 800 MOHM	0
IHLM2525CZER100M06 Vishay / Dale	FIXED IND 10UH 3A 97.71 MOHM SMD	0
ISC1812BN3R9J Vishay / Dale	FIXED IND 3.9UH 344MA 590 MOHM	0
ISC1812RQ331J Vishay / Dale	FIXED IND 330UH 96MA 7.54 OHM	0
IHLP1616ABERR22M11 Vishay / Dale	FIXED IND 220NH 9.5A 10.5 MOHM	0
ILSB0805ERR15K Vishay / Dale	FIXED IND 150NH 250MA 400 MOHM	0
IHLP5050EZER3R3M5A Vishay / Dale	FIXED IND 3.3UH 16A 7.7 MOHM SMD	25
ISC1210EB6R8J Vishay / Dale	FIXED IND 6.8UH 205MA 1.6 OHM	0
IMC1812BN470J Vishay / Dale	FIXED IND 47UH 140MA 5 OHM SMD	0
IHHP0806ABER2R2M01 Vishay / Dale	FIXED IND 2.2UH 1.8A 155 MOHM	0
IMC0603ER72NG01 Vishay / Dale	FIXED IND 72NH 400MA 490 MOHM	0
ISC1210SY3R3J Vishay / Dale	FIXED IND 3.3UH 270MA 1.1 OHM	0
ILC0603ER56NJ Vishay / Dale	FIXED IND 56NH 300MA 750MOHM SMD	0
IHD3ER151L Vishay / Dale	FIXED IND 150UH 1.6A 129 MOHM TH	0
IHA104EB Vishay / Dale	FIXED IND 500UH 1.6A 420 MOHM TH	523
IMC1812EB12NM Vishay / Dale	FIXED IND 12NH 450MA 200 MOHM	0
IHHP0806AZER2R2M01 Vishay / Dale	FIXED IND 2.2UH 2A 158 MOHM SMD	393102
ISC1210SY101J Vishay / Dale	FIXED IND 100UH 80MA 12 OHM SMD	0
IHLP5050EZER2R2M5A Vishay / Dale	FIXED IND 2.2UH 22A 3.75 MOHM	41

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