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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
SM2511-R82MHF

SM2511-R82MHF

ITG Electronics, Inc.

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

0
SLQ40407A-1R2MHF

SLQ40407A-1R2MHF

ITG Electronics, Inc.

FIXED IND 1.2UH 31A 0.73 MOHM

100
SLM40328A-R72MHF

SLM40328A-R72MHF

ITG Electronics, Inc.

0.71UH, 20%, 0.85MOHM, 21AMP MAX

900
DHP106095S-180MHF

DHP106095S-180MHF

ITG Electronics, Inc.

19UH, 20%, 4.2MOHM, 25.6AMP MAX.

30
SL3732H-R30KHF

SL3732H-R30KHF

ITG Electronics, Inc.

0.3UH, 10%, 0.29MOHM, 33AMP MAX.

130
SM2511-R22MHF

SM2511-R22MHF

ITG Electronics, Inc.

0.22UH, 20%, 2.5MOHM, 40AMP MAX.

4000
DHP106095S-860MHF

DHP106095S-860MHF

ITG Electronics, Inc.

86UH, 20%, 14.7MOHM, 10.5AMP MAX

30
PQ108081-220MHF

PQ108081-220MHF

ITG Electronics, Inc.

FIXED IND 24UH 19A 6.2 MOHM SMD

20
L301314A-301LHF

L301314A-301LHF

ITG Electronics, Inc.

300UH, 170MOHM, 1.8A MAX. TOROID

24
SL3732H-R18KHF

SL3732H-R18KHF

ITG Electronics, Inc.

0.18UH, 10%, 0.29MOHM, 55AMP MAX

0
SL3732A-R15KHF

SL3732A-R15KHF

ITG Electronics, Inc.

0.15UH, 10%, 0.29MOHM, 67AMP MAX

1430
SM1608A-R22MHF

SM1608A-R22MHF

ITG Electronics, Inc.

0.22UH, 20%, 5MOHM, 12.5AMP MAX.

0
SL3732H-R22KHF

SL3732H-R22KHF

ITG Electronics, Inc.

0.22UH, 10%, 0.29MOHM, 45AMP MAX

1300
SLM534214A-1R0MHF

SLM534214A-1R0MHF

ITG Electronics, Inc.

1UH, 20%, 0.42MOHM, 40AMP MAX. S

250
PQ108081-4R7MHF

PQ108081-4R7MHF

ITG Electronics, Inc.

FIXED IND 4.7UH 31A 2.5 MOHM SMD

20
SLM40327A-1R4MHF

SLM40327A-1R4MHF

ITG Electronics, Inc.

1.39UH, 20%, 0.85MOHM, 8AMP MAX.

0
L201219-831MHF

L201219-831MHF

ITG Electronics, Inc.

836.7UH, 20%, 80 MOHM DCR, 5.2A

20
SM2511-8R2MHF

SM2511-8R2MHF

ITG Electronics, Inc.

8.2UH, 20%, 64MOHM, 7.5AMP MAX.

0
SM2511-100MHF

SM2511-100MHF

ITG Electronics, Inc.

10UH, 20%, 102MOHM, 7AMP MAX. SM

8000
L201219-113MHF

L201219-113MHF

ITG Electronics, Inc.

11360UH, 20%, 1250 MOHM DCR, 1.2

20

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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