Fixed Inductors

Part Number	Description / PDF	Quantity
IMC1812RQ270J Vishay / Dale	FIXED IND 27UH 170MA 3.6 OHM SMD	0
ISC1210EB3R9K Vishay / Dale	FIXED IND 3.9UH 250MA 1.2 OHM	0
IMC1812ER100J Vishay / Dale	FIXED IND 10UH 250MA 1.6 OHM SMD	0
IMC1812BN22NM Vishay / Dale	FIXED IND 22NH 450MA 200 MOHM	0
IHLP2525CZER8R2M01 Vishay / Dale	FIXED IND 8.2UH 4A 68 MOHM SMD	9618
ISC1812ERR12M Vishay / Dale	FIXED IND 120NH 519MA 260 MOHM	0
IMC1210BNR10M Vishay / Dale	FIXED IND 100NH 450MA 440 MOHM	0
IHLP2020CZER6R8M8A Vishay / Dale	FIXED IND 6.8 UH 3.2 A 111 MOHM	0
IMC1210SY22NM Vishay / Dale	FIXED IND 22NH 592MA 200 MOHM	0
ISC1210SY1R5K Vishay / Dale	FIXED IND 1.5UH 370MA 750 MOHM	0
IMC0603ER82NG01 Vishay / Dale	FIXED IND 82NH 400MA 540 MOHM	0
ISC1812EB3R9K Vishay / Dale	FIXED IND 3.9UH 344MA 590 MOHM	0
IMC0805ER2N2S01 Vishay / Dale	FIXED IND 2.2NH 800MA 60 MOHM	0
IHA104BA Vishay / Dale	FIXED IND 500UH 1.6A 420 MOHM TH	0
IHLP2525CZER3R3M51 Vishay / Dale	FIXED IND 3.3UH 6.8A 28.4 MOHM	0
ISC1210SYR47J Vishay / Dale	FIXED IND 470NH 460MA 440 MOHM	0
IMC1210SZR10K Vishay / Dale	FIXED IND 100NH 450MA 440 MOHM	0
ISC1812BN1R2J Vishay / Dale	FIXED IND 1.2UH 429MA 380 MOHM	0
ISC1812RVR39J Vishay / Dale	FIXED IND 390NH 394MA 450 MOHM	0
ISC1210BNR47K Vishay / Dale	FIXED IND 470NH 460MA 440 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