Fixed Inductors

Part Number	Description / PDF	Quantity
ISC1812ES151J Vishay / Dale	FIXED IND 150UH 130MA 4.16 OHM	0
IHSM7832ER470L Vishay / Dale	FIXED IND 47UH 2.6A 120 MOHM SMD	0
IMC1210ER27NK Vishay / Dale	FIXED IND 27NH 564MA 220 MOHM	0
IFSC1111AZER3R3M01 Vishay / Dale	FIXED IND 3.3UH 1.2A 150 MOHM	0
IMC1210BN10NM Vishay / Dale	FIXED IND 10NH 734MA 130 MOHM	0
IHD1EB560L Vishay / Dale	FIXED IND 56UH 1.4A 130 MOHM TH	0
ILSB1206ERR15K Vishay / Dale	FIXED IND 150NH 250MA 300 MOHM	0
ISC1812EB680K Vishay / Dale	FIXED IND 68UH 164MA 2.6 OHM SMD	0
IHSM3825ER100L Vishay / Dale	FIXED IND 10UH 1.74A 126 MOHM	0
IHLP2020CZER1R0M11 Vishay / Dale	FIXED IND 1UH 10A 11 MOHM SMD	0
IMC1210BN82NM Vishay / Dale	FIXED IND 82NH 450MA 400 MOHM	0
IMC1210BNR27J Vishay / Dale	FIXED IND 270NH 456MA 360 MOHM	0
IMC1210ETR18K Vishay / Dale	FIXED IND 180NH 518MA 280 MOHM	0
IHLE5050FHER3R3M5A Vishay / Dale	FIXED IND 3.3UH 20.2A 5.44 MOHM	25
IHLP2525CZERR33M07 Vishay / Dale	FIXED IND 330NH 20A 3.2 MOHM SMD	0
IMC1210EB5R6K Vishay / Dale	FIXED IND 5.6UH 217MA 1.6 OHM	0
IMC1210EBR39K Vishay / Dale	FIXED IND 390NH 450MA 450 MOHM	0
IMC1812ER121J Vishay / Dale	FIXED IND 120UH 110MA 8 OHM SMD	0
IHLP5050CEER1R5M07 Vishay / Dale	FIXED IND 1.5UH 19A 4.97 MOHM	0
IMC1812BN150K Vishay / Dale	FIXED IND 15UH 200MA 2.5 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