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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
1130-2R7M-RC

1130-2R7M-RC

J.W. Miller / Bourns

FIXED IND 2.7UH 21A 3 MOHM TH

0
VLCF4028T-470MR48-2

VLCF4028T-470MR48-2

TDK Corporation

FIXED IND 47UH 480MA 490 MOHM

359
1226AS-H-100M=P2

1226AS-H-100M=P2

TOKO / Murata

FIXED IND 10UH 1A 216 MOHM SMD

98
LMXN1915M680CTAS

LMXN1915M680CTAS

Elco (AVX)

FIXED IND 68UH 130 MOHM SMD

0
RL262-222J-RC

RL262-222J-RC

J.W. Miller / Bourns

FIXED IND 2.2MH 50MA 14 OHM TH

0
SPM3020T-R47M-LR

SPM3020T-R47M-LR

TDK Corporation

FIXED IND 470NH 4.8A 22.7 MOHM

5761
103-391G

103-391G

API Delevan

FIXED IND 390NH 635MA 240 MOHM

0
AIMC-0402HQ-3N6C-T

AIMC-0402HQ-3N6C-T

Abracon

FIXED IND 3.6NH 700MA 100 MOHM

0
BWVS005050404R7M00

BWVS005050404R7M00

Chilisin Electronics

FIXED IND 4.7UH 3.2A 32 MOHM SMD

0
2200HT-820-H-RC

2200HT-820-H-RC

J.W. Miller / Bourns

FIXED IND 82UH 5.6A 55 MOHM TH

0
IMC1210BN220J

IMC1210BN220J

Vishay / Dale

FIXED IND 22UH 145MA 3.7 OHM SMD

0
NR8040T220M

NR8040T220M

TAIYO YUDEN

FIXED IND 22UH 2.2A 85.8 MOHM

2928
S1812R-334K

S1812R-334K

API Delevan

FIXED IND 330UH 129MA 12 OHM SMD

2949
CIH03Q1N0CNC

CIH03Q1N0CNC

Samsung Electro-Mechanics

FIXED IND 1NH 490MA 90 MOHM SMD

920
0819-18F

0819-18F

API Delevan

FIXED IND 560NH 510MA 180 MOHM

0
CDR6D23MNNP-680NC

CDR6D23MNNP-680NC

Sumida Corporation

FIXED IND 68UH 450MA 751.3 MOHM

0
744765191GA

744765191GA

Würth Elektronik Midcom

FIXED IND 91NH 120MA 2.3OHM SMD

2950
MHQ1005P30NHTD25

MHQ1005P30NHTD25

TDK Corporation

FIXED IND 30NH 220MA 1.3 OHM SMD

0
AMPLA7050S-R82MT

AMPLA7050S-R82MT

Abracon

FIXED IND 820NH 16.5A 4.9 MOHM

0
VLF302512MT-3R3M-CA

VLF302512MT-3R3M-CA

TDK Corporation

FIXED IND 3.3UH 1.63A 108 MOHM

18

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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