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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
B82475M1154K000

B82475M1154K000

TDK EPCOS

FIXED IND 150UH 780MA 470 MOHM

0
1025-10K

1025-10K

API Delevan

FIXED IND 390NH 710MA 300 MOHM

0
LQW15AN1N8C00D

LQW15AN1N8C00D

TOKO / Murata

FIXED IND 1.8NH 460MA 160 MOHM

31823
LK21253R3K-T

LK21253R3K-T

TAIYO YUDEN

FIXED IND 3.3UH 50MA 600 MOHM

0
LQW15AN8N6G8ZD

LQW15AN8N6G8ZD

TOKO / Murata

FIXED IND 8.6NH 1.42A 70 MOHM

11354
83473C

83473C

Murata Power Solutions

FIXED IND 47UH 350MA 710 MOHM

0
EHEI201608A-1R0M-Q8DG

EHEI201608A-1R0M-Q8DG

Chilisin Electronics

FIXED INDUCTOR

12000
744786018A

744786018A

Würth Elektronik Midcom

FIXED IND 1.8NH 600MA 100 MOHM

0
MLP2520W1R0MT0S1

MLP2520W1R0MT0S1

TDK Corporation

FIXED IND 1UH 2.3A 62 MOHM SMD

0
ISC1812BN391K

ISC1812BN391K

Vishay / Dale

FIXED IND 390UH 92MA 8.2 OHM SMD

0
LQP02HQ7N5H02E

LQP02HQ7N5H02E

TOKO / Murata

FIXED IND 7.5NH 300MA 500 MOHM

0
0819-08H

0819-08H

API Delevan

FIXED IND 220NH 645MA 250 MOHM

0
HLQ021R0BTTR

HLQ021R0BTTR

Elco (AVX)

FIXED IND 1NH 330MA 100 MOHM SMD

9970
MPXV1D0618LR47

MPXV1D0618LR47

KEMET

FIXED IND 470NH 10.7A 8.5 MOHM

1000
AMPLA1004S-3R3MT

AMPLA1004S-3R3MT

Abracon

FIXED IND 3.3UH 11A 11.8 MOHM

0
P1812R-473H

P1812R-473H

API Delevan

FIXED IND 47UH 260MA 2.064 OHM

0
ISC1210AN220K

ISC1210AN220K

Vishay / Dale

FIXED IND 22UH 150MA 3.1 OHM SMD

0
MHQ0603P4N1CT000

MHQ0603P4N1CT000

TDK Corporation

FIXED IND 4.1NH 400MA 350 MOHM

0
LQH66SN331M03L

LQH66SN331M03L

TOKO / Murata

FIXED IND 330UH 280MA 2.52 OHM

133
LQP02HQ3N9B02E

LQP02HQ3N9B02E

TOKO / Murata

FIXED IND 3.9NH 350MA 350 MOHM

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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