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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
SBCP-47HY331B

SBCP-47HY331B

KEMET

FIXED IND 330UH 270MA 1.8 OHM TH

2921
L0603CR33JRMST

L0603CR33JRMST

KEMET

FIXED IND 330NH 150MA 2.1 OHM

4353
L0603CR39JRMST

L0603CR39JRMST

KEMET

FIXED IND 390NH 150MA 2.3 OHM

4000
MPXV1D0840LR47

MPXV1D0840LR47

KEMET

FIXED IND 470NH 25.8A 2.7 MOHM

1000
SBC6-680-222

SBC6-680-222

KEMET

FIXED IND 68UH 2.2A 90 MOHM TH

21
SBC8-332-421

SBC8-332-421

KEMET

FIXED IND 3.3MH 420MA 2.5 OHM TH

109
MPX1D0520L4R7

MPX1D0520L4R7

KEMET

FIXED IND 4.7UH 3.4A 96.6 MOHM

937
MPXV1D0520LR15

MPXV1D0520LR15

KEMET

FIXED IND 150NH 16.9A 3.9 MOHM

955
MPX1D0830LR22

MPX1D0830LR22

KEMET

FIXED IND 220NH 30.7A 1.9 MOHM

900
MPXV1D1250L6R8

MPXV1D1250L6R8

KEMET

FIXED IND 6.8UH 11.6A 15.5MOHM

213
SBC2-470-951

SBC2-470-951

KEMET

FIXED IND 47UH 950MA 210 MOHM TH

3638
MPX1D0618L1R5

MPX1D0618L1R5

KEMET

FIXED IND 1.5UH 6.2A 25.8 MOHM

1000
L0603CR10JRMST

L0603CR10JRMST

KEMET

FIXED IND 100NH 300MA 1 OHM SMD

1700
SBC3-151-791

SBC3-151-791

KEMET

FIXED IND 150UH 790MA 360 MOHM

0
SBCP-47HY151B

SBCP-47HY151B

KEMET

FIXED IND 150UH 410MA 878 MOHM

585
L0805B150MDWLT

L0805B150MDWLT

KEMET

FIXED INDUCTOR 15UH SMD

2990
MPX1D1264LR68

MPX1D1264LR68

KEMET

FIXED IND 680NH 35.4A 1.9 MOHM

248
SBC4-472-141

SBC4-472-141

KEMET

FIXED IND 4.7MH 140MA 9.78 OHM

298
MPX1D1040LR22

MPX1D1040LR22

KEMET

FIXED IND 220NH 32.7A 1.6 MOHM

500
SBCP-14HY2R2B

SBCP-14HY2R2B

KEMET

FIXED IND 2.2UH 4.35A 20 MOHM TH

200

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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