Fixed Inductors

Part Number	Description / PDF	Quantity
ISC1812BN331K Vishay / Dale	FIXED IND 330UH 96MA 7.54 OHM	0
ISC1812BNR39K Vishay / Dale	FIXED IND 390NH 394MA 450 MOHM	0
IHLP4040DZER100M5A Vishay / Dale	FIXED IND 10UH 6.5A 33.06 MOHM	2962
IMC1210EB56NJ Vishay / Dale	FIXED IND 56NH 470MA 330 MOHM	0
ISC1210BN1R2K Vishay / Dale	FIXED IND 1.2UH 390MA 650 MOHM	0
IMC1812ER270J Vishay / Dale	FIXED IND 27UH 170MA 3.6 OHM SMD	0
IMC1812ESR47J Vishay / Dale	FIXED IND 470NH 355MA 800 MOHM	0
IHLP2525CZER220M5A Vishay / Dale	FIXED IND 22UH 2.8A 174 MOHM SMD	2573
IHLP5050FDERR10M01 Vishay / Dale	FIXED IND 100NH 60A 0.5 MOHM SMD	0
ISC1812BN820J Vishay / Dale	FIXED IND 82UH 156MA 2.86 OHM	0
IMC1812ER180K Vishay / Dale	FIXED IND 18UH 190MA 2.8 OHM SMD	0
ISC1210BNR27M Vishay / Dale	FIXED IND 270NH 500MA 330 MOHM	0
IHLP2020CZER5R6M01 Vishay / Dale	FIXED IND 5.6UH 3A 108 MOHM SMD	0
IHD1ER330L Vishay / Dale	FIXED IND 33UH 1.8A 75 MOHM TH	0
ISC1210ER180J Vishay / Dale	FIXED IND 18UH 155MA 2.7 OHM SMD	0
IHHP0806ABER1R5M01 Vishay / Dale	FIXED IND 1.5UH 2.2A 104 MOHM	49
ISC1210BN5R6J Vishay / Dale	FIXED IND 5.6UH 210MA 1.4 OHM	0
IMC1812ESR33M Vishay / Dale	FIXED IND 330NH 430MA 550 MOHM	0
IHLP4040DZER1R0M51 Vishay / Dale	FIXED IND 1UH 23.5A 3.07 MOHM	0
IHLP1616BZER2R2M01 Vishay / Dale	FIXED IND 2.2UH 2.85A 90 MOHM	10097

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