Fixed Inductors

Part Number	Description / PDF	Quantity
IHLM2525CZER1R5M07 Vishay / Dale	FIXED IND 1.5UH 9A 14.5 MOHM SMD	0
IH10BQ680K Vishay / Dale	FIXED IND 68UH 10A 27 MOHM TH	0
ISC1812ES221J Vishay / Dale	FIXED IND 220UH 105MA 6.3 OHM	0
IHLP5050FDER100M01 Vishay / Dale	FIXED IND 10UH 10A 17.2 MOHM SMD	5929
IMC1812ES100J Vishay / Dale	FIXED IND 10UH 250MA 1.6 OHM SMD	0
IMC1812ES560K Vishay / Dale	FIXED IND 56UH 135MA 5.5 OHM SMD	0
ISC1812BN102J Vishay / Dale	FIXED IND 1MH 66MA 16 OHM SMD	0
ISC1812EB821K Vishay / Dale	FIXED IND 820UH 72MA 13.5 OHM	0
IMC1210EB47NK Vishay / Dale	FIXED IND 47NH 483MA 300 MOHM	0
IMC1210EB33NM Vishay / Dale	FIXED IND 33NH 540MA 240 MOHM	0
IMC0603ER12NJ01 Vishay / Dale	FIXED IND 12NH 700MA 130 MOHM	0
IHLM2525CZERR33M06 Vishay / Dale	FIXED IND 330NH 20A 3.2 MOHM SMD	0
IHLP4040DZER150M5A Vishay / Dale	FIXED IND 15UH 5.1A 50.29 MOHM	0
IHLP2020CZER1R5M01 Vishay / Dale	FIXED IND 1.5UH 7.2A 20.7 MOHM	10211
IHLP5050EZERR22M01 Vishay / Dale	FIXED IND 220NH 51A 0.8 MOHM SMD	0
IMC1812ER681K Vishay / Dale	FIXED IND 680UH 50MA 30 OHM SMD	0
IHSM7832ER1R5L Vishay / Dale	FIXED IND 1.5UH 8.6A 12 MOHM SMD	0
ISC1812BN1R5J Vishay / Dale	FIXED IND 1.5UH 418MA 400 MOHM	0
IMC1210ERR12K Vishay / Dale	FIXED IND 120NH 584MA 220 MOHM	0
ISC1812RQ391K Vishay / Dale	FIXED IND 390UH 92MA 8.2 OHM SMD	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