Fixed Inductors

Part Number	Description / PDF	Quantity
ISC1812EB330K Vishay / Dale	FIXED IND 33UH 202MA 1.72 OHM	0
IMC1210BN12NK Vishay / Dale	FIXED IND 12NH 707MA 140 MOHM	0
IHLP2525CZER3R3M11 Vishay / Dale	FIXED IND 3.3UH 7A 26 MOHM SMD	5194
ISC1210SY330J Vishay / Dale	FIXED IND 33UH 115MA 5.1 OHM SMD	0
IMC1812EB1R5K Vishay / Dale	FIXED IND 1.5UH 410MA 600 MOHM	0
IMC1812ER10NM Vishay / Dale	FIXED IND 10NH 450MA 200 MOHM	0
ISC1812ESR39M Vishay / Dale	FIXED IND 390NH 394MA 450 MOHM	0
IMC1812EB391J Vishay / Dale	FIXED IND 390UH 80MA 16 OHM SMD	0
IHLP6767GZER4R7M01 Vishay / Dale	FIXED IND 4.7UH 25A 5.11 MOHM	1556
ISC1812EBR22M Vishay / Dale	FIXED IND 220NH 441MA 360 MOHM	0
ISC1812ES561J Vishay / Dale	FIXED IND 560UH 82MA 10.5 OHM	0
ISC1812EB1R2K Vishay / Dale	FIXED IND 1.2UH 429MA 380 MOHM	0
ISC1812RQR68M Vishay / Dale	FIXED IND 680NH 296MA 800 MOHM	0
IFSC1515AHER1R0M01 Vishay / Dale	FIXED IND 1UH 3.8A 25 MOHM SMD	1038
IMC1210BN101K Vishay / Dale	FIXED IND 100UH 73MA 14 OHM SMD	0
IMC1812ESR10M Vishay / Dale	FIXED IND 100NH 450MA 320 MOHM	0
IHLP3232DZERR47M5A Vishay / Dale	FIXED IND 470NH 27A 2.55 MOHM	0
IHLM2525CZER100M01 Vishay / Dale	FIXED IND 10UH 3A 105 MOHM SMD	3110
ISC1812RQ6R8K Vishay / Dale	FIXED IND 6.8UH 306MA 750 MOHM	0
IHLP5050EZER1R8M01 Vishay / Dale	FIXED IND 1.8UH 19A 4.9 MOHM SMD	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