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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
TFM252012ALMA4R7MTAA

TFM252012ALMA4R7MTAA

TDK Corporation

FIXED IND 4.7UH 1.6A 200 MOHM

19921
ELJ-NAR15MF

ELJ-NAR15MF

Panasonic

FIXED IND 150NH 230MA 720 MOHM

4959
LQW15AN43NJ80D

LQW15AN43NJ80D

TOKO / Murata

FIXED IND 43NH 515MA 516 MOHM

0
LMXS101AN150LTAS

LMXS101AN150LTAS

Elco (AVX)

FIXED IND 15UH 3.6A 50 MOHM SMD

0
LQB18NNR56N10D

LQB18NNR56N10D

TOKO / Murata

FIXED IND 560NH 300MA 850 MOHM

0
18R154C

18R154C

Murata Power Solutions

FIXED IND 150UH 1.1A 165 MOHM TH

49
SP1210-122G

SP1210-122G

API Delevan

FIXED IND 1.2UH 1.14A 160 MOHM

0
L-15W6N8JV4E

L-15W6N8JV4E

Johanson Technology

FIXED IND 6.8NH 600MA 60 MOHM

0
NRV3012T2R2MV

NRV3012T2R2MV

TAIYO YUDEN

FIXED IND 2.2UH 1.1A 144 MOHM

3934
PF0464.732NLT

PF0464.732NLT

PulseLarsen Antenna

FIXED IND 7.3UH 2.1A 45 MOHM SMD

0
HK10056N8J-TV

HK10056N8J-TV

TAIYO YUDEN

FIXED IND 6.8NH 300MA 250 MOHM

683
CD104NP-330MC

CD104NP-330MC

Sumida Corporation

FIXED IND 33UH 1.26A 120 MOHM

0
103-392G

103-392G

API Delevan

FIXED IND 3.9UH 250MA 1.55 OHM

0
AMPLA5030Q-R25MT

AMPLA5030Q-R25MT

Abracon

FIXED IND 250NH 15A 4.1 MOHM SMD

0
TFM201610ALC-R47MTAA

TFM201610ALC-R47MTAA

TDK Corporation

FIXED IND 470NH 5.2A 25 MOHM SMD

1364
PF0601.123NL

PF0601.123NL

PulseLarsen Antenna

FIXED IND 12UH 1A 140 MOHM SMD

0
CIG22BR27MNE

CIG22BR27MNE

Samsung Electro-Mechanics

FIXED IND 270NH 1.8A 47 MOHM SMD

0
P1168.684NLT

P1168.684NLT

PulseLarsen Antenna

FIXED IND 680UH 500MA 1.824 OHM

1550
CR54NP-221KC

CR54NP-221KC

Sumida Corporation

FIXED IND 220UH 350MA 1.57 OHM

0
MHQ0603P33NHTD25

MHQ0603P33NHTD25

TDK Corporation

FIXED IND 33NH 160MA 2.8OHM SMD

1670

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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