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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
IMC1812ER390K

IMC1812ER390K

Vishay / Dale

FIXED IND 39UH 150MA 4.5 OHM SMD

0
ISC1812BN470K

ISC1812BN470K

Vishay / Dale

FIXED IND 47UH 183MA 2.1 OHM SMD

0
IMC1812EB270J

IMC1812EB270J

Vishay / Dale

FIXED IND 27UH 170MA 3.6 OHM SMD

0
IMC1812EB221J

IMC1812EB221J

Vishay / Dale

FIXED IND 220UH 100MA 10 OHM SMD

0
IMC1210ERR56J

IMC1210ERR56J

Vishay / Dale

FIXED IND 560NH 450MA 550 MOHM

0
IHD1ER1R0L

IHD1ER1R0L

Vishay / Dale

FIXED IND 1UH 5.3A 9 MOHM TH

0
IMC1210ER18NK

IMC1210ER18NK

Vishay / Dale

FIXED IND 18NH 624MA 180 MOHM

0
ISC1812EB120J

ISC1812EB120J

Vishay / Dale

FIXED IND 12UH 265MA 1 OHM SMD

0
IMC1812BNR12M

IMC1812BNR12M

Vishay / Dale

FIXED IND 120NH 450MA 300 MOHM

0
IMC1812ES1R2K

IMC1812ES1R2K

Vishay / Dale

FIXED IND 1.2UH 430MA 550 MOHM

0
IMC1210EBR39J

IMC1210EBR39J

Vishay / Dale

FIXED IND 390NH 450MA 450 MOHM

0
ISC1812ES391K

ISC1812ES391K

Vishay / Dale

FIXED IND 390UH 92MA 8.2 OHM SMD

0
ISC1812EB391J

ISC1812EB391J

Vishay / Dale

FIXED IND 390UH 92MA 8.2 OHM SMD

0
IMC1812ER390J

IMC1812ER390J

Vishay / Dale

FIXED IND 39UH 150MA 4.5 OHM SMD

0
IHLP2525CZERR47M07

IHLP2525CZERR47M07

Vishay / Dale

FIXED IND 470NH 17.5A 3.86 MOHM

0
IMC1812RV3R9J

IMC1812RV3R9J

Vishay / Dale

FIXED IND 3.9UH 330MA 900 MOHM

0
IFSC1111AZER100M01

IFSC1111AZER100M01

Vishay / Dale

FIXED IND 10UH 800MA 340 MOHM

1358
IHSM4825ER2R7L

IHSM4825ER2R7L

Vishay / Dale

FIXED IND 2.7UH 5.1A 34 MOHM SMD

0
ISC1812RXR33J

ISC1812RXR33J

Vishay / Dale

FIXED IND 330NH 418MA 400 MOHM

0
IHLP2020BZERR47M01

IHLP2020BZERR47M01

Vishay / Dale

FIXED IND 470NH 11.5A 9.4 MOHM

89295

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

TypeFunctional CharacteristicsApplication Examples
Wirewound InductorsHigh precision, high current handling, low resistancePower supplies, DC-DC converters
Chip InductorsCompact SMD package, stable performance at high frequenciesMobile devices, RF circuits
Ferrite Bead InductorsEffective high-frequency noise suppressionEMI filtering in digital circuits
Thin-Film InductorsUltra-compact, high Q-factor, tight tolerance5G 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

ParameterDescriptionImportance
Inductance (L)Measured in henrys (H), determines energy storage capacityDefines filtering/energy storage performance
Rated Current (Irated)Maximum DC current before saturationPrevents core saturation and failure
DC Resistance (DCR)Resistance of coil windingsAffects efficiency and thermal performance
Self-Resonant Frequency (SRF)Frequency where inductor behaves as capacitorLimits effective operating frequency range
Q FactorQuality factor indicating efficiencyHigher 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

ManufacturerRepresentative ProductKey Features
MurataLQH3NPN100M10 H, 1.2A, 1.8 1.4mm chip inductor
TDKMLZ2012A100T100MHz SRF, 1.0 1.25mm for RF circuits
VishayIHLP2525CZER1R0M1 H, 12A, composite construction
Coilcraft0402DC-103J10 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
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