Fixed Inductors

Part Number	Description / PDF	Quantity
IHLP5050EZER100M01 Vishay / Dale	FIXED IND 10UH 9A 25.5 MOHM SMD	1
IMC1210SYR33K Vishay / Dale	FIXED IND 330NH 453MA 400 MOHM	0
ISC1812RQ4R7K Vishay / Dale	FIXED IND 4.7UH 336MA 620 MOHM	0
IMC1812BN100J Vishay / Dale	FIXED IND 10UH 250MA 1.6 OHM SMD	0
IFSC0806AZER100M01 Vishay / Dale	FIXED IND 10UH 450MA 1.33 OHM	10989
IMC1812EB6R8J Vishay / Dale	FIXED IND 6.8UH 285MA 1.2 OHM	0
ISC1210SYR82M Vishay / Dale	FIXED IND 820NH 450MA 500 MOHM	0
IHD3ER332L Vishay / Dale	FIXED IND 3.3MH 400MA 2.53 OHM	0
IMC1210BN68NM Vishay / Dale	FIXED IND 68NH 450MA 360 MOHM	0
ISC1812RQR47M Vishay / Dale	FIXED IND 470NH 342MA 600 MOHM	0
ISC1210EB820K Vishay / Dale	FIXED IND 82UH 85MA 11 OHM SMD	0
IHLP3232DZER4R7M51 Vishay / Dale	FIXED IND 4.7UH 7.2A 28.46 MOHM	0
ISC1812ES1R8J Vishay / Dale	FIXED IND 1.8UH 403MA 430 MOHM	0
IFSC1515AHER4R7M01 Vishay / Dale	FIXED IND 4.7UH 2.2A 90 MOHM SMD	198201
IMC1812BNR10M Vishay / Dale	FIXED IND 100NH 450MA 320 MOHM	0
IMC1812ERR18M Vishay / Dale	FIXED IND 180NH 450MA 350 MOHM	0
IFCB0603ER18NG Vishay / Dale	FIXED IND 18NH 300MA 1.65 OHM	0
IMC1812EU8R2K Vishay / Dale	FIXED IND 8.2UH 270MA 1.4 OHM	0
IMC1210ER100K Vishay / Dale	FIXED IND 10UH 189MA 2.1 OHM SMD	2409
IMC1812BNR39M Vishay / Dale	FIXED IND 390NH 380MA 700 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