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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
B82477P2472M000

B82477P2472M000

TDK EPCOS

FIXED IND 4.7UH 5.4A 160 MOHM

570
B82477P4823M000

B82477P4823M000

TDK EPCOS

FIXED IND 82UH 2.1A 120 MOHM SMD

380
B82144F2183K000

B82144F2183K000

TDK EPCOS

FIXED IND 18UH 2.2A 155 MOHM TH

0
B82442T1125K050

B82442T1125K050

TDK EPCOS

FIXED IND 1.2MH 140MA 12.6 OHM

0
B82464G4334M000

B82464G4334M000

TDK EPCOS

FIXED IND 330UH 590MA 650 MOHM

1458
B82144F1103K000

B82144F1103K000

TDK EPCOS

FIXED IND 10UH 1.5A 180 MOHM TH

0
B82498F3821G000

B82498F3821G000

TDK EPCOS

FIXED IND 820NH 180MA 1.9 OHM

0
B82141A1184K009

B82141A1184K009

TDK EPCOS

FIXED IND 180UH 135MA 5.3 OHM TH

0
B82422T1152K008

B82422T1152K008

TDK EPCOS

FIXED IND 1.5UH 370MA 700 MOHM

0
B78148E1472K000

B78148E1472K000

TDK EPCOS

FIXED IND 4.7UH 2.75A 85 MOHM TH

6130
B82498F3470G001

B82498F3470G001

TDK EPCOS

FIXED IND 47NH 600MA 130 MOHM

0
B82422T1122K008

B82422T1122K008

TDK EPCOS

FIXED IND 1.2UH 390MA 700 MOHM

0
B82442T1274K000

B82442T1274K000

TDK EPCOS

FIXED IND 270UH 290MA 2.95 OHM

0
B82442A1125J000

B82442A1125J000

TDK EPCOS

FIXED IND 1.2MH 75MA 13.6 OHM

0
B82559A0222A013

B82559A0222A013

TDK EPCOS

FIXED IND 2.15UH 15A 3.2 MOHM

1028
B82442A1335K000

B82442A1335K000

TDK EPCOS

FIXED IND 3.3MH 40MA 48 OHM SMD

0
B82144A2103K009

B82144A2103K009

TDK EPCOS

FIXED IND 10UH 1.4A 220 MOHM TH

0
B82141A1153K009

B82141A1153K009

TDK EPCOS

FIXED IND 15UH 365MA 740 MOHM TH

0
B82422A1102K100

B82422A1102K100

TDK EPCOS

FIXED IND 1UH 380MA 340 MOHM SMD

0
B82144A2102K000

B82144A2102K000

TDK EPCOS

FIXED IND 1UH 2.2A 80 MOHM TH

4741

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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