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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
PQ108081-561MHF

PQ108081-561MHF

ITG Electronics, Inc.

FIXED IND 560UH 4A 95 MOHM SMD

20
SL3732A-R12KHF

SL3732A-R12KHF

ITG Electronics, Inc.

0.12UH, 10%, 0.29MOHM, 80AMP MAX

780
AH42328A-R22KHF

AH42328A-R22KHF

ITG Electronics, Inc.

FIXED IND 220NH 73A 0.18 MOHM

90
SL3732C-R15KHF

SL3732C-R15KHF

ITG Electronics, Inc.

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

0
SM2518-1R5MHF

SM2518-1R5MHF

ITG Electronics, Inc.

1.5UH, 20%, 8.6MOHM, 14AMP MAX.

0
AH3740A-270K

AH3740A-270K

ITG Electronics, Inc.

0.27UH, 10%, 0.145MOHM, 30AMP MA

0
SM2518-1R2MHF

SM2518-1R2MHF

ITG Electronics, Inc.

1.2UH, 20%, 6.7MOHM, 18AMP MAX.

0
L101247A-220L

L101247A-220L

ITG Electronics, Inc.

220NH, 15%, 0.125MOHM, 57A MAX.

0
AF13A-220K

AF13A-220K

ITG Electronics, Inc.

FIXED IND 220NH 66A 0.17 MOHM

1600
L201219-251MHF

L201219-251MHF

ITG Electronics, Inc.

251.2UH, 20%, 28 MOHM DCR, 9A DI

20
L301308-542K

L301308-542K

ITG Electronics, Inc.

5.4MH, 10%, 820MOHM, 2.3A MAX. T

6
L101247A-250L

L101247A-250L

ITG Electronics, Inc.

0.25UH, 15%, 0.125MOHM, 50AMP MA

0
SM2518-R56MHF

SM2518-R56MHF

ITG Electronics, Inc.

0.56UH, 20%, 3.4MOHM, 23AMP MAX.

7500
AH42328A-R12KHF

AH42328A-R12KHF

ITG Electronics, Inc.

FIXED IND 120NH 73A 0.18 MOHM

90
PQ108081-151MHF

PQ108081-151MHF

ITG Electronics, Inc.

150UH, 20%, 31.5MOHM, 8.7AMP MAX

20
SM2511-6R8MHF

SM2511-6R8MHF

ITG Electronics, Inc.

6.8UH, 20%, 54MOHM, 8AMP MAX. SM

0
SLM40327A-R28MHF

SLM40327A-R28MHF

ITG Electronics, Inc.

0.28UH, 20%, 0.85MOHM, 57AMP MAX

0
PQ108081-331MHF

PQ108081-331MHF

ITG Electronics, Inc.

330UH, 20%, 56MOHM, 5.5AMP MAX.

20
SM2511-R10MHF

SM2511-R10MHF

ITG Electronics, Inc.

0.1UH, 20%, 1.5MOHM, 60AMP MAX.

18000
SLM534214A-1R2MHF

SLM534214A-1R2MHF

ITG Electronics, Inc.

1.2UH, 20%, 0.42MOHM, 32AMP MAX.

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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