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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
SM2511-R33MHF

SM2511-R33MHF

ITG Electronics, Inc.

0.33UH, 20%, 3.5MOHM, 30AMP MAX.

10000
SQ4126-R42MHF

SQ4126-R42MHF

ITG Electronics, Inc.

0.42UH, 20%, 1.2MOHM, 45AMP MAX.

2100
SM5018-R82MHF

SM5018-R82MHF

ITG Electronics, Inc.

0.82UH, 20%, 1.9MOHM, 53AMP MAX.

500
AH3740A-220K

AH3740A-220K

ITG Electronics, Inc.

0.22UH, 10%, 0.145MOHM, 38AMP MA

500
SM2518-6R8MHF

SM2518-6R8MHF

ITG Electronics, Inc.

6.8UH, 20%, 42.5MOHM, 6.5AMP MAX

0
SMHC2511-3R3MHF

SMHC2511-3R3MHF

ITG Electronics, Inc.

3.3UH, 20%, 28MOHM, 13.5AMP MAX.

8000
SQ4126-5R6MHF

SQ4126-5R6MHF

ITG Electronics, Inc.

5.6UH, 20%, 8.6MOHM, 9.4AMP MAX.

0
L101247A-150L

L101247A-150L

ITG Electronics, Inc.

0.15UH, 15%, 0.125MOHM, 84AMP MA

900
SMHC2511-R82MHF

SMHC2511-R82MHF

ITG Electronics, Inc.

0.82UH, 20%, 6.7MOHM, 24AMP MAX.

10000
L201204-102MHF

L201204-102MHF

ITG Electronics, Inc.

1000UH, 20%, 88 MOHM DCR, 5.4A D

6
SM2518-R68MHF

SM2518-R68MHF

ITG Electronics, Inc.

0.68UH, 20%, 4.2MOHM, 21AMP MAX.

16000
L201203-730MHF

L201203-730MHF

ITG Electronics, Inc.

73UH, 20%, 6.07 MOHM DCR, 7.2A D

12
DHP106095S-500MHF

DHP106095S-500MHF

ITG Electronics, Inc.

50UH, 20%, 11.2MOHM, 16.2AMP MAX

30
SM1608A-100MHF

SM1608A-100MHF

ITG Electronics, Inc.

10UH, 20%, 256.3MOHM, 2AMP MAX.

0
SL2224A-R055MHF

SL2224A-R055MHF

ITG Electronics, Inc.

FIXED IND 55NH 50A 0.2 MOHM SMD

800
L301307-222K

L301307-222K

ITG Electronics, Inc.

2.2MH, 10%, 165MOHM, 1.3A MAX. T

9
SLM534214A-R47MHF

SLM534214A-R47MHF

ITG Electronics, Inc.

0.47UH, 20%, 0.42MOHM, 81AMP MAX

0
SM2518-R47MHF

SM2518-R47MHF

ITG Electronics, Inc.

0.47UH, 20%, 2.6MOHM, 32AMP MAX.

3500
AF13A-100K

AF13A-100K

ITG Electronics, Inc.

FIXED IND 100NH 66A 0.17 MOHM

4100
SL3732A-R18KHF

SL3732A-R18KHF

ITG Electronics, Inc.

0.18UH, 10%, 0.29MOHM, 47AMP MAX

130

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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