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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
B82475M1683K000

B82475M1683K000

TDK EPCOS

FIXED IND 68UH 1.11A 220 MOHM

0
B82471A1224K000

B82471A1224K000

TDK EPCOS

FIXED IND 220UH 350MA 1.57 OHM

0
B82141A1562K009

B82141A1562K009

TDK EPCOS

FIXED IND 5.6UH 510MA 380 MOHM

0
B82144A2226J000

B82144A2226J000

TDK EPCOS

FIXED IND 22MH 40MA 120 OHM TH

2940
B82442T1684K000

B82442T1684K000

TDK EPCOS

FIXED IND 680UH 210MA 5.87 OHM

0
B82133A5202M000

B82133A5202M000

TDK EPCOS

FIXED IND 14UH 2A 130 MOHM TH

0
B82432C1105K000

B82432C1105K000

TDK EPCOS

FIXED IND 1MH 55MA 32 OHM SMD

335
B82477G2104M000

B82477G2104M000

TDK EPCOS

FIXED IND 100UH 1.3A 160 MOHM

400
B82442T1273K050

B82442T1273K050

TDK EPCOS

FIXED IND 27UH 880MA 307 MOHM

0
B82475A1153M000

B82475A1153M000

TDK EPCOS

FIXED IND 15UH 2.27A 80 MOHM SMD

0
B78148S1224J009

B78148S1224J009

TDK EPCOS

FIXED IND 220UH 250MA 3.3 OHM TH

0
B82442H1274J000

B82442H1274J000

TDK EPCOS

FIXED IND 270UH 220MA 3.36 OHM

0
B82472G4684M000

B82472G4684M000

TDK EPCOS

FIXED IND 680UH 230MA 3.65 OHM

0
B82473A1154K000

B82473A1154K000

TDK EPCOS

FIXED IND 150UH 580MA 640 MOHM

0
B82477P4473M000

B82477P4473M000

TDK EPCOS

FIXED IND 47UH 2.8A 67 MOHM SMD

11920
B82496C3479Z000

B82496C3479Z000

TDK EPCOS

FIXED IND 4.7NH 800MA 100 MOHM

0
B82422H1682K000

B82422H1682K000

TDK EPCOS

FIXED IND 6.8UH 570MA 350 MOHM

2459
B82432C1564K000

B82432C1564K000

TDK EPCOS

FIXED IND 560UH 70MA 23 OHM SMD

0
B82442H1395J000

B82442H1395J000

TDK EPCOS

FIXED IND 3.9MH 53MA 56 OHM SMD

0
B82472G6334M000

B82472G6334M000

TDK EPCOS

FIXED IND 330UH 330MA 1.7 OHM

1000

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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