Fixed Inductors

Part Number	Description / PDF	Quantity
IHD3EB104L Vishay / Dale	FIXED IND 100MH 70MA 76 OHM TH	0
IHLP1212AZEV1R0M5A Vishay / Dale	FIXED IND 1 UH 3.59A 58.99 MOHM	0
IHD1EB3R3L Vishay / Dale	FIXED IND 3.3UH 4A 16 MOHM TH	0
IHLP2020BZER3R3M01 Vishay / Dale	FIXED IND 3.3UH 3.3A 85.5 MOHM	0
ISC1812EB471J Vishay / Dale	FIXED IND 470UH 87MA 9.2 OHM SMD	0
IHLP2525BDERR82M01 Vishay / Dale	FIXED IND 820NH 10A 11.8 MOHM	0
IMC1210EBR12K Vishay / Dale	FIXED IND 120NH 584MA 220 MOHM	0
IHLP5050FDER6R8M51 Vishay / Dale	FIXED IND 6.8UH 14.2A 12.09 MOHM	0
IMC1210ERR22M Vishay / Dale	FIXED IND 220NH 484MA 320 MOHM	0
ISC1812EB1R8K Vishay / Dale	FIXED IND 1.8UH 403MA 430 MOHM	0
IHLP4040DZET2R2M01 Vishay / Dale	FIXED IND 2.2UH 12A 9MOHM SMD	455
ILSB1206ERR27K Vishay / Dale	FIXED IND 270NH 250MA 500 MOHM	0
IHLP1212AZEVR33M5A Vishay / Dale	FIXED IND 0.33 UH 5.85A 23.3 MOH	0
IHD1ER102L Vishay / Dale	FIXED IND 1MH 330MA 2.3 OHM TH	0
IHLP4040DZER4R7M8A Vishay / Dale	FIXED IND 4.7UH 9.8A 15.32 MOHM	858
IHD1ER391L Vishay / Dale	FIXED IND 390UH 570MA 770 MOHM	0
IHLP1212AZEVR47M5A Vishay / Dale	FIXED IND 0.47 UH 5.35A 27.92 MO	0
IMC1210BN68NK Vishay / Dale	FIXED IND 68NH 450MA 360 MOHM	0
IHLP2525AHER1R0M01 Vishay / Dale	FIXED IND 1UH 7A 18.3 MOHM SMD	157
IHLP6767GZER4R7M5A Vishay / Dale	FIXED IND 4.7UH 24A 5.23 MOHM	1757

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