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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
AISC-1008F-5R6G-T

AISC-1008F-5R6G-T

Abracon

FIXED IND 5.6UH 380MA 2.65 OHM

0
MCL2012V1-R150-R

MCL2012V1-R150-R

PowerStor (Eaton)

FIXED IND 150NH 350MA 200 MOHM

7940
744765039A

744765039A

Würth Elektronik Midcom

FIXED IND 3.9NH 840MA 66 MOHM

6000
1537-58J

1537-58J

API Delevan

FIXED IND 43UH 194MA 2.7 OHM TH

0
LQW15AN8N9J80D

LQW15AN8N9J80D

TOKO / Murata

FIXED IND 8.9NH 1.42A 70 MOHM

0
VLS2012ET-220M

VLS2012ET-220M

TDK Corporation

FIXED IND 22UH 330MA 1.764 OHM

2739
7447471331

7447471331

Würth Elektronik Midcom

FIXED IND 330UH 1A 480 MOHM TH

116
LQH32DN470K23L

LQH32DN470K23L

TOKO / Murata

FIXED IND 47UH 170MA 1.69 OHM

0
RLB9012-120KL

RLB9012-120KL

J.W. Miller / Bourns

FIXED IND 12UH 3.1A 50 MOHM TH

118
LQH43NN821K03L

LQH43NN821K03L

TOKO / Murata

FIXED IND 820UH 60MA 20.5 OHM

0
ASPI-0403S-222M-T

ASPI-0403S-222M-T

Abracon

FIXED IND 2.2MH 100MA 8.5 OHM

12254
CKP2520M1R5M-T

CKP2520M1R5M-T

TAIYO YUDEN

FIXED IND 1.5UH 1.3A 90 MOHM SMD

0
MLP2012SR47T

MLP2012SR47T

TDK Corporation

FIXED IND 470NH 1.2A 169 MOHM

445
HLQ026R8HTTR

HLQ026R8HTTR

Elco (AVX)

FIXED IND 6.8NH 160MA 600 MOHM

0
HCMA1305-1R8-R

HCMA1305-1R8-R

PowerStor (Eaton)

FIXED IND 1.8UH 21A 4.6 MOHM SMD

7
74404043033A

74404043033A

Würth Elektronik Midcom

FIXED IND 3.3UH 3.23A 33 MOHM

7010
L08055R6BEWTR

L08055R6BEWTR

Elco (AVX)

FIXED IND 5.6NH 750MA 100 MOHM

0
MHQ0603P1N3CT000

MHQ0603P1N3CT000

TDK Corporation

FIXED IND 1.3NH 800MA 100 MOHM

9524
0410CDMCCDS-R33MC

0410CDMCCDS-R33MC

Sumida Corporation

FIXED IND 330NH 6A 23MOHM SMD

0
RLB0913-151K

RLB0913-151K

J.W. Miller / Bourns

FIXED IND 150UH 1A 370 MOHM TH

3

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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