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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
MLG0603S0N6BTD25

MLG0603S0N6BTD25

TDK Corporation

FIXED IND 0.6NH 600MA 100 MOHM

0
M83446/39-29F

M83446/39-29F

API Delevan

FIXED IND 2.2UH 535MA 700 MOHM

687
PG0871.472NL

PG0871.472NL

PulseLarsen Antenna

FIXED IND 4.7UH 6.7A 17 MOHM SMD

0
LPA1226-501KL

LPA1226-501KL

J.W. Miller / Bourns

FIXED IND 500UH 800MA 500MOHM TH

0
AX97-10331

AX97-10331

Triad Magnetics

FIXED IND 330UH 150MA 6.9 OHM

0
1008-182J

1008-182J

API Delevan

FIXED IND 1.8UH 457MA 720 MOHM

0
2100LL-220-H-RC

2100LL-220-H-RC

J.W. Miller / Bourns

FIXED IND 22UH 7.5A 12 MOHM TH

84
LQW18AN2N2D00D

LQW18AN2N2D00D

TOKO / Murata

FIXED IND 2.2NH 700MA 49 MOHM

7455
74404032150

74404032150

Würth Elektronik Midcom

FIXED IND 15UH 730MA 300 MOHM

774
MHQ1005P7N3GT000

MHQ1005P7N3GT000

TDK Corporation

FIXED IND 7.3NH 600MA 170 MOHM

0
MLG0402Q6N8JT000

MLG0402Q6N8JT000

TDK Corporation

FIXED IND 6.8NH 140MA 1.6 OHM

15395
154H

154H

Hammond Manufacturing

FIXED IND 4H 50MA 300 OHM CHASS

20
CLF10040T-150M-H

CLF10040T-150M-H

TDK Corporation

FIXED IND 15UH 3.2A 40 MOHM SMD

2198
L101247A-220L

L101247A-220L

ITG Electronics, Inc.

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

0
103-221J

103-221J

API Delevan

FIXED IND 220NH 665MA 220 MOHM

0
LQM18PN1R8NC0L

LQM18PN1R8NC0L

TOKO / Murata

FIXED IND 1.8UH 700MA 300 MOHM

2814
RL262-332J-RC

RL262-332J-RC

J.W. Miller / Bourns

FIXED IND 3.3MH 40MA 25 OHM TH

0
7440690010

7440690010

Würth Elektronik Midcom

FIXED IND 1UH 3.6A 26 MOHM SMD

0
PCMB063T-3R3MS

PCMB063T-3R3MS

Susumu

FIXED IND 3.3UH 6A 30 MOHM SMD

8400
2727-10F

2727-10F

API Delevan

FIXED IND 56UH 185MA 5.6 OHM TH

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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