Fixed Inductors

Part Number	Description / PDF	Quantity
IHLP3232DZER3R3M11 Vishay / Dale	FIXED IND 3.3UH 10.5A 14.9 MOHM	9027
IMC1210BN680K Vishay / Dale	FIXED IND 68UH 83MA 11 OHM SMD	0
IHLP3232DZERR22M5A Vishay / Dale	FIXED IND 220NH 36A 1.86 MOHM	0
IMC1210EB270J Vishay / Dale	FIXED IND 27UH 122MA 5 OHM SMD	0
IHLP5050EZER6R8M01 Vishay / Dale	FIXED IND 6.8UH 11A 18.5 MOHM	1912
IMC1812ESR22K Vishay / Dale	FIXED IND 220NH 450MA 400 MOHM	0
ISC1812ESR10M Vishay / Dale	FIXED IND 100NH 552MA 230 MOHM	0
IHLP5050EZER220M5A Vishay / Dale	FIXED IND 22UH 6.9A 44.8 MOHM	671
ISC1812ES330J Vishay / Dale	FIXED IND 33UH 202MA 1.72 OHM	0
IHD1EB821L Vishay / Dale	FIXED IND 820UH 360MA 1.98 OHM	0
IMC1812ES151J Vishay / Dale	FIXED IND 150UH 105MA 9 OHM SMD	0
IMC1210ER4R7J Vishay / Dale	FIXED IND 4.7UH 224MA 1.5 OHM	0
IHSM3825ER3R3L Vishay / Dale	FIXED IND 3.3UH 2.94A 45 MOHM	0
ISC1812BN1R0K Vishay / Dale	FIXED IND 1UH 447MA 350 MOHM SMD	0
ISC1210ER68NK Vishay / Dale	FIXED IND 68NH 475MA 350 MOHM	2000
ISC1812ES101J Vishay / Dale	FIXED IND 100UH 147MA 3.25 OHM	0
ISC1812RX120K Vishay / Dale	FIXED IND 12UH 265MA 1 OHM SMD	0
IMC1812ER3R3K Vishay / Dale	FIXED IND 3.3UH 355MA 800 MOHM	0
ILSB0603ERR18K Vishay / Dale	FIXED IND 180NH 50MA 600 MOHM	0
IHA103BA Vishay / Dale	FIXED IND 250UH 1.8A 280 MOHM TH	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