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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
SL3732A-R10KHF

SL3732A-R10KHF

ITG Electronics, Inc.

0.1UH, 10%, 0.29MOHM, 95AMP MAX.

1430
DHP106095S-330MHF

DHP106095S-330MHF

ITG Electronics, Inc.

33UH, 20%, 8.6MOHM, 19.8AMP MAX.

30
SLM43328A-R43MHF

SLM43328A-R43MHF

ITG Electronics, Inc.

0.43UH, 20%, 0.93MOHM, 40AMP MAX

0
L201203-102MHF

L201203-102MHF

ITG Electronics, Inc.

1170UH, 20%, 60.5 MOHM DCR, 1.8A

12
AH3740A-150K

AH3740A-150K

ITG Electronics, Inc.

0.15UH, 10%, 0.145MOHM, 60AMP MA

400
L101247A-135L

L101247A-135L

ITG Electronics, Inc.

0.135UH, 15%, 0.125MOHM, 95AMP M

0
SQ4126-6R8MHF

SQ4126-6R8MHF

ITG Electronics, Inc.

6.8UH, 20%, 8.6MOHM SMD FLAT WIR

0
SM2511-1R5MHF

SM2511-1R5MHF

ITG Electronics, Inc.

1.5UH, 20%, 14MOHM, 18AMP MAX. S

20000
L101247A-70L

L101247A-70L

ITG Electronics, Inc.

0.07UH, 15%, 0.125MOHM, 180AMP M

0
L201203-303MHF

L201203-303MHF

ITG Electronics, Inc.

30000UH, 20%, 1930 MOHM DCR, 0.3

12
SM2518-2R2MHF

SM2518-2R2MHF

ITG Electronics, Inc.

2.2UH, 20%, 13MOHM, 13AMP MAX. S

0
L301307-332K

L301307-332K

ITG Electronics, Inc.

3.3MH, 10%, 240MOHM, 1.1A MAX. T

9
SLM40327A-R39MHF

SLM40327A-R39MHF

ITG Electronics, Inc.

0.405UH, 20%, 0.85MOHM, 38AMP MA

0
L301308-332K

L301308-332K

ITG Electronics, Inc.

3.3MH, 10%, 410MOHM, 3.0A MAX. T

6
SL3732H-R15KHF

SL3732H-R15KHF

ITG Electronics, Inc.

0.15UH, 10%, 0.29MOHM, 66AMP MAX

1300
SQ4126-2R2MHF

SQ4126-2R2MHF

ITG Electronics, Inc.

2.2UH, 20%, 6.35MOHM, 18AMP MAX.

1200
SM5018-R47MHF

SM5018-R47MHF

ITG Electronics, Inc.

0.47UH, 20%, 1.1MOHM, 65AMP MAX.

500
SM2518-R82MHF

SM2518-R82MHF

ITG Electronics, Inc.

0.82UH, 20%, 4.6MOHM, 20AMP MAX.

11500
PQ108081-3R3MHF

PQ108081-3R3MHF

ITG Electronics, Inc.

FIXED IND 3.3UH 31A 2.5 MOHM SMD

20
SLA40476B-580L

SLA40476B-580L

ITG Electronics, Inc.

580.0NH, 15%, 0.125MOHM, 18.0A M

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

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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