Fixed Inductors

Part Number	Description / PDF	Quantity
IHLP2525CZET8R2M11 Vishay / Dale	FIXED IND 8.2UH 5A 54.9MOHM SMD	327
ISC1812ER102K Vishay / Dale	FIXED IND 1MH 66MA 16 OHM SMD	4724
IFSC1111ABER2R2M01 Vishay / Dale	FIXED IND 2.2UH 1.9A 98 MOHM SMD	11313
IHLP2020CZERR68M5A Vishay / Dale	FIXED IND 0.68 UH 11.3 A 9.74 MO	0
IMC1210EB1R5J Vishay / Dale	FIXED IND 1.5UH 370MA 850 MOHM	0
IHLP2020CZET3R3M01 Vishay / Dale	FIXED IND 3.3UH 5A 54.7MOHM SMD	1941
IMC1210BN220J Vishay / Dale	FIXED IND 22UH 145MA 3.7 OHM SMD	0
IHLP6767GZERR47M8A Vishay / Dale	FIXED IND 470NH 65A 0.95MOHM SMD	162
ISC1812EB5R6K Vishay / Dale	FIXED IND 5.6UH 333MA 690 MOHM	0
IHLP6767GZER5R6M01 Vishay / Dale	FIXED IND 5.6UH 21A 7.05 MOHM	726
IHLP2525CZET1R0M11 Vishay / Dale	FIXED IND 1UH 12.5A 8MOHM SMD	760
IMC1210BNR15M Vishay / Dale	FIXED IND 150NH 548MA 250 MOHM	0
IMC1812ES180K Vishay / Dale	FIXED IND 18UH 190MA 2.8 OHM SMD	0
ISC1210EB1R5J Vishay / Dale	FIXED IND 1.5UH 370MA 750 MOHM	0
IMC1210SY330J Vishay / Dale	FIXED IND 33UH 112MA 6 OHM SMD	0
IHLP2525EZERR22M01 Vishay / Dale	FIXED IND 220NH SMD	0
IMC1210EB6R8J Vishay / Dale	FIXED IND 6.8UH 204MA 1.8 OHM	0
IHDM1008BCEV1R2M30 Vishay / Dale	FIXED IND 1.2UH 80A 0.3 MOHM TH	487
IMC1812RV1R8J Vishay / Dale	FIXED IND 1.8UH 390MA 650 MOHM	0
ISC1812ES820J Vishay / Dale	FIXED IND 82UH 156MA 2.86 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