Fixed Inductors

Part Number	Description / PDF	Quantity
IHLP2020BZET100M01 Vishay / Dale	FIXED IND 10UH 2.3A 199MOHM SMD	2845
IMC1812RQR18M Vishay / Dale	FIXED IND 180NH 450MA 350 MOHM	0
ISC1812RQ121J Vishay / Dale	FIXED IND 120UH 139MA 3.64 OHM	0
IHSM3825ER181L Vishay / Dale	FIXED IND 180UH 360MA 3.28 OHM	0
IMC1812RQ820J Vishay / Dale	FIXED IND 82UH 120MA 7 OHM SMD	0
IMC1812ES181J Vishay / Dale	FIXED IND 180UH 102MA 9.5 OHM	0
IHA201BA Vishay / Dale	FIXED IND 27UH 3.7A 60 MOHM TH	0
ISC1812ES121J Vishay / Dale	FIXED IND 120UH 139MA 3.64 OHM	0
IHLP2525CZER4R7M8A Vishay / Dale	FIXED IND 4.7UH 5.6A 38.4 MOHM	5358
IHLP6767GZER2R2M11 Vishay / Dale	FIXED IND 2.2UH 43.5A 1.98 MOHM	894
IMC1812RV5R6J Vishay / Dale	FIXED IND 5.6UH 300MA 1.1 OHM	0
ISC1210ER560K Vishay / Dale	FIXED IND 56UH 95MA 10 OHM SMD	0
IMC1210BN2R7J Vishay / Dale	FIXED IND 2.7UH 290MA 1.1 OHM	0
IMC1210ER101K Vishay / Dale	FIXED IND 100UH 73MA 14 OHM SMD	259
IHLP2525CZERR22M01 Vishay / Dale	FIXED IND 220NH 23A 2.8 MOHM SMD	1042
IMC1812BNR82J Vishay / Dale	FIXED IND 820NH 250MA 1.6 OHM	0
ISC1812RV121J Vishay / Dale	FIXED IND 120UH 139MA 3.64 OHM	0
IMC1210R9R10M Vishay / Dale	FIXED IND 100NH 450MA 440 MOHM	0
IHLP2525CZER6R8M51 Vishay / Dale	FIXED IND 6.8UH 4.4A 57.6 MOHM	0
IMC1210ER3R3J Vishay / Dale	FIXED IND 3.3UH 260MA 1.2 OHM	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