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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
IMC1210ER270K

IMC1210ER270K

Vishay / Dale

FIXED IND 27UH 122MA 5 OHM SMD

0
ISC1812ER221J

ISC1812ER221J

Vishay / Dale

FIXED IND 220UH 105MA 6.3 OHM

570
IMC1210BNR56M

IMC1210BNR56M

Vishay / Dale

FIXED IND 560NH 450MA 550 MOHM

0
ILC0603ER3N9S

ILC0603ER3N9S

Vishay / Dale

FIXED IND 3.9NH 300MA 140 MOHM

0
ISC1210ERR12M

ISC1210ERR12M

Vishay / Dale

FIXED IND 120NH 630MA 200 MOHM

0
IHLD3232HBER330M5A

IHLD3232HBER330M5A

Vishay / Dale

FIXED IND 33UH 2.4A 159.43 MOHM

208
IMC1812EB1R2J

IMC1812EB1R2J

Vishay / Dale

FIXED IND 1.2UH 430MA 550 MOHM

0
ISC1812ES270J

ISC1812ES270J

Vishay / Dale

FIXED IND 27UH 212MA 1.56 OHM

0
IHLP2525AHER4R7M01

IHLP2525AHER4R7M01

Vishay / Dale

FIXED IND 4.7UH 3A 78 MOHM SMD

1470
IMC1812RQ680K

IMC1812RQ680K

Vishay / Dale

FIXED IND 68UH 130MA 6 OHM SMD

0
ISC1812RQ390K

ISC1812RQ390K

Vishay / Dale

FIXED IND 39UH 192MA 1.89 OHM

0
IMC1812ES150J

IMC1812ES150J

Vishay / Dale

FIXED IND 15UH 200MA 2.5 OHM SMD

0
ISC1210SYR47K

ISC1210SYR47K

Vishay / Dale

FIXED IND 470NH 460MA 440 MOHM

0
ISC1210EB120K

ISC1210EB120K

Vishay / Dale

FIXED IND 12UH 175MA 2.3 OHM SMD

0
ISC1812ER121J

ISC1812ER121J

Vishay / Dale

FIXED IND 120UH 139MA 3.64 OHM

0
IMC1210ER220K

IMC1210ER220K

Vishay / Dale

FIXED IND 22UH 145MA 3.7 OHM SMD

1758
IHLP2020BZER3R3M11

IHLP2020BZER3R3M11

Vishay / Dale

FIXED IND 3.3UH 4.1A 57.8 MOHM

2070
ISC1812RX1R0K

ISC1812RX1R0K

Vishay / Dale

FIXED IND 1UH 447MA 350 MOHM SMD

0
IMC1210SYR47M

IMC1210SYR47M

Vishay / Dale

FIXED IND 470NH 450MA 500 MOHM

0
IHLP2525EZER2R2M01

IHLP2525EZER2R2M01

Vishay / Dale

FIXED IND 2.2UH 10A 13.6 MOHM

2970

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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