Fixed Inductors

Part Number	Description / PDF	Quantity
IHD3ER104L Vishay / Dale	FIXED IND 100MH 70MA 76 OHM TH	0
IMC0805ER6N8J01 Vishay / Dale	FIXED IND 6.8NH 600MA 60 MOHM	0
IHLP2525CZER1R0M8A Vishay / Dale	FIXED IND 1UH 12A 8.45 MOHM SMD	2655
IHLP5050CEER1R0M07 Vishay / Dale	FIXED IND 1UH 24A 3.21 MOHM SMD	0
IMC1210EB270K Vishay / Dale	FIXED IND 27UH 122MA 5 OHM SMD	0
IHLP4040DZERR19M01 Vishay / Dale	FIXED IND 190NH 40A 0.95 MOHM	953
IMC1210BN3R3K Vishay / Dale	FIXED IND 3.3UH 260MA 1.2 OHM	0
IMC1210SY151K Vishay / Dale	FIXED IND 150UH 65MA 15 OHM SMD	0
IMC1210EB100J Vishay / Dale	FIXED IND 10UH 189MA 2.1 OHM SMD	0
IMC1812ES331K Vishay / Dale	FIXED IND 330UH 85MA 14 OHM SMD	0
ILC0603ER18NJ Vishay / Dale	FIXED IND 18NH 300MA 350MOHM SMD	0
ISC1812BNR68J Vishay / Dale	FIXED IND 680NH 296MA 800 MOHM	0
ILC0603ERR10J Vishay / Dale	FIXED IND 100NH 300MA 1OHM SMD	0
ISC1210EBR33M Vishay / Dale	FIXED IND 330NH 475MA 360 MOHM	0
IHLP2020BZERR22M01 Vishay / Dale	FIXED IND 220NH 15A 5.2 MOHM SMD	4231
ISC1210ER470K Vishay / Dale	FIXED IND 47UH 100MA 8 OHM SMD	2976
IHLP5050FDERR47M01 Vishay / Dale	FIXED IND 470NH 41A 1.2 MOHM SMD	2924
IFSC1111AZER470M01 Vishay / Dale	FIXED IND 47UH 350MA 2.05 OHM	0
IMC1812EB220J Vishay / Dale	FIXED IND 22UH 180MA 3.2 OHM SMD	0
IHLP6767GZER6R8M01 Vishay / Dale	FIXED IND 6.8UH 19A 8.83 MOHM	308

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