Fixed Inductors

Part Number	Description / PDF	Quantity
IHD3EB560L Vishay / Dale	FIXED IND 56UH 3.2A 43 MOHM TH	0
IHD1EB561L Vishay / Dale	FIXED IND 560UH 470MA 1.14 OHM	35
IHD3EB182L Vishay / Dale	FIXED IND 1.8MH 600MA 1.5 OHM TH	0
IMC1812BN271K Vishay / Dale	FIXED IND 270UH 92MA 12 OHM SMD	0
IHLP4040DZER220M8A Vishay / Dale	FIXED IND 22UH 4.1A 75.44 MOHM	3970
IMC1210EBR27J Vishay / Dale	FIXED IND 270NH 456MA 360 MOHM	0
IMC1210ER820J Vishay / Dale	FIXED IND 82UH 79MA 12 OHM SMD	0
IMC1812EB150K Vishay / Dale	FIXED IND 15UH 200MA 2.5 OHM SMD	0
IHLP6767GZER1R0M8A Vishay / Dale	FIXED IND 1UH 53A 1.46MOHM SMD	176
IHLP2525CZER100M51 Vishay / Dale	FIXED IND 10UH 4A 76.9 MOHM SMD	0
IMC1210ER470J Vishay / Dale	FIXED IND 47UH 91MA 9 OHM SMD	0
ISC1812EBR56K Vishay / Dale	FIXED IND 560NH 306MA 750 MOHM	0
IMC1812ES3R9K Vishay / Dale	FIXED IND 3.9UH 330MA 900 MOHM	0
IMC1812EBR39M Vishay / Dale	FIXED IND 390NH 380MA 700 MOHM	0
IMC1812ES391K Vishay / Dale	FIXED IND 390UH 80MA 16 OHM SMD	0
IMC1210EB82NM Vishay / Dale	FIXED IND 82NH 450MA 400 MOHM	0
IHLP1616BZET1R0M11 Vishay / Dale	FIXED IND 1UH 4.5A 27MOHM SMD	2988
IMC1210ER5R6J Vishay / Dale	FIXED IND 5.6UH 217MA 1.6 OHM	0
IHLP4040DZET4R7M11 Vishay / Dale	FIXED IND 4.7UH 9.5A 14.2MOHM SM	472
ISC1812ES8R2K Vishay / Dale	FIXED IND 8.2UH 292MA 820 MOHM	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