Fixed Inductors

Part Number	Description / PDF	Quantity
IMC0603ER6N8J01 Vishay / Dale	FIXED IND 6.8NH 700MA 110 MOHM	0
IHLD4032KBER150M5A Vishay / Dale	FIXED IND 15UH 4.6A 45.5 MOHM	211
IMC1210EB2R7K Vishay / Dale	FIXED IND 2.7UH 290MA 1.1 OHM	0
ISC1812ESR39K Vishay / Dale	FIXED IND 390NH 394MA 450 MOHM	0
IMC1210EBR47J Vishay / Dale	FIXED IND 470NH 450MA 500 MOHM	0
ISC1210ER5R6J Vishay / Dale	FIXED IND 5.6UH 210MA 1.4 OHM	0
ISC1812RQ271K Vishay / Dale	FIXED IND 270UH 101MA 6.9 OHM	0
IMC1210EBR27K Vishay / Dale	FIXED IND 270NH 456MA 360 MOHM	0
IMC1812ER681J Vishay / Dale	FIXED IND 680UH 50MA 30 OHM SMD	0
ISC1210EBR15K Vishay / Dale	FIXED IND 150NH 600MA 200 MOHM	0
IHLP2020CZER100M01 Vishay / Dale	FIXED IND 10UH 2.5A 164 MOHM SMD	15545
IHLP5050FDER2R2M01 Vishay / Dale	FIXED IND 2.2UH 22A 4.2 MOHM SMD	6743
ISC1812RV4R7K Vishay / Dale	FIXED IND 4.7UH 336MA 620 MOHM	0
IMC1812ESR33K Vishay / Dale	FIXED IND 330NH 430MA 550 MOHM	0
ISC1812RV121K Vishay / Dale	FIXED IND 120UH 139MA 3.64 OHM	0
IMC1812BN390K Vishay / Dale	FIXED IND 39UH 150MA 4.5 OHM SMD	0
IMC1210EB22NK Vishay / Dale	FIXED IND 22NH 592MA 200 MOHM	0
IHA201EB Vishay / Dale	FIXED IND 27UH 3.7A 60 MOHM TH	0
IHLP6767GZERR56M11 Vishay / Dale	FIXED IND 560NH 61A 1.05 MOHM	0
ISC1210ERR18M Vishay / Dale	FIXED IND 180NH 580MA 240 MOHM	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