Fixed Inductors

Part Number	Description / PDF	Quantity
IMC1812BNR82K Vishay / Dale	FIXED IND 820NH 250MA 1.6 OHM	0
IFSC1111ABER6R8M01 Vishay / Dale	FIXED IND 6.8UH 1.2A 228 MOHM	0
IMC1812EB331K Vishay / Dale	FIXED IND 330UH 85MA 14 OHM SMD	0
IMC1210ER82NK Vishay / Dale	FIXED IND 82NH 450MA 400 MOHM	23
ISC1210ER3R9J Vishay / Dale	FIXED IND 3.9UH 250MA 1.2 OHM	0
IFSC1111AZER2R2M01 Vishay / Dale	FIXED IND 2.2UH 1.3A 105 MOHM	0
IHSM4825ER560L Vishay / Dale	FIXED IND 56UH 950MA 397 MOHM	0
IMC1812EB681K Vishay / Dale	FIXED IND 680UH 50MA 30 OHM SMD	0
ISC1210ER100K Vishay / Dale	FIXED IND 10UH 185MA 2 OHM SMD	1154
ISC1210ER27NM Vishay / Dale	FIXED IND 27NH 610MA 170 MOHM	0
ISC1812EB1R0J Vishay / Dale	FIXED IND 1UH 447MA 350 MOHM SMD	0
ISC1210SYR56M Vishay / Dale	FIXED IND 560NH 455MA 460 MOHM	0
ISC1812BN100J Vishay / Dale	FIXED IND 10UH 279MA 900 MOHM	0
IHLP5050EZER8R2M5A Vishay / Dale	FIXED IND 8.2UH 12.85A 16.6 MOHM	30
IFSC1008ABERR47M01 Vishay / Dale	FIXED IND 470NH 3.7A 29 MOHM SMD	0
IHLP5050EZER3R0M5A Vishay / Dale	FIXED IND 3UH 17.9A 6.31 MOHM	243
IHLP1212BZERR88M11 Vishay / Dale	FIXED IND 880NH 5.5A 22 MOHM SMD	9534
IMC1812RV561K Vishay / Dale	FIXED IND 560UH 50MA 30 OHM SMD	0
IHD3EB103L Vishay / Dale	FIXED IND 10MH 250MA 7.3 OHM TH	0
IMC1812ES39NM Vishay / Dale	FIXED IND 39NH 450MA 300 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