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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
IMC1812EB68NM

IMC1812EB68NM

Vishay / Dale

FIXED IND 68NH 450MA 350 MOHM

0
IHLP2525BDERR47M01

IHLP2525BDERR47M01

Vishay / Dale

FIXED IND 470NH 13.5A 6.5 MOHM

2426
IMC1812BN331K

IMC1812BN331K

Vishay / Dale

FIXED IND 330UH 85MA 14 OHM SMD

0
IHD3ER391L

IHD3ER391L

Vishay / Dale

FIXED IND 390UH 1.6A 288 MOHM TH

0
ILSB1206ER68NM

ILSB1206ER68NM

Vishay / Dale

FIXED IND 68NH 300MA 250 MOHM

0
IMC0603ER3N9C01

IMC0603ER3N9C01

Vishay / Dale

FIXED IND 3.9NH 700MA 80 MOHM

0
IMC1210BN27NK

IMC1210BN27NK

Vishay / Dale

FIXED IND 27NH 564MA 220 MOHM

0
IHLP4040DZERR47M11

IHLP4040DZERR47M11

Vishay / Dale

FIXED IND 470NH 30A 1.68 MOHM

93
IMC1812BN47NM

IMC1812BN47NM

Vishay / Dale

FIXED IND 47NH 450MA 300 MOHM

0
IMC1210ER120K

IMC1210ER120K

Vishay / Dale

FIXED IND 12UH 173MA 2.5 OHM SMD

0
IHLP5050FDER220M5A

IHLP5050FDER220M5A

Vishay / Dale

FIXED IND 22UH 8.3A 33.49 MOHM

884
IMC1210BN560J

IMC1210BN560J

Vishay / Dale

FIXED IND 56UH 87MA 10 OHM SMD

0
ISC1812BNR12K

ISC1812BNR12K

Vishay / Dale

FIXED IND 120NH 519MA 260 MOHM

0
ISC1210ERR68J

ISC1210ERR68J

Vishay / Dale

FIXED IND 680NH 450MA 480 MOHM

0
IHA503EB

IHA503EB

Vishay / Dale

FIXED IND 27UH 6.5A 30 MOHM TH

0
ISC1812ES271J

ISC1812ES271J

Vishay / Dale

FIXED IND 270UH 101MA 6.9 OHM

0
IHSM7832ER682L

IHSM7832ER682L

Vishay / Dale

FIXED IND 6.8MH 190MA 15.8 OHM

0
IHA304EB

IHA304EB

Vishay / Dale

FIXED IND 50UH 4.3A 50 MOHM TH

0
IHLP6767GZER270M11

IHLP6767GZER270M11

Vishay / Dale

FIXED IND 27UH SMD

0
IHLP2020CZET4R7M01

IHLP2020CZET4R7M01

Vishay / Dale

FIXED IND 4.7UH 3.5A 77.5MOHM SM

1733

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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