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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
LQP03PN2N2C02D

LQP03PN2N2C02D

TOKO / Murata

FIXED IND 2.2NH 1.4A 55 MOHM SMD

10355
IMC1812ES180K

IMC1812ES180K

Vishay / Dale

FIXED IND 18UH 190MA 2.8 OHM SMD

0
MLG0603P3N9CT000

MLG0603P3N9CT000

TDK Corporation

FIXED IND 3.9NH 400MA 300 MOHM

3961
ISC1210EB1R5J

ISC1210EB1R5J

Vishay / Dale

FIXED IND 1.5UH 370MA 750 MOHM

0
LBR2518T2R2MV

LBR2518T2R2MV

TAIYO YUDEN

FIXED IND 2.2UH 480MA 70 MOHM

0
PL8705T

PL8705T

PulseR (iNRCORE

FIXED IND 18.5UH 5.2A 23.24MOHM

297
SDR1307A-560K

SDR1307A-560K

J.W. Miller / Bourns

FIXED IND 56UH 2.5A 100 MOHM SMD

0
AH3740A-270K

AH3740A-270K

ITG Electronics, Inc.

0.27UH, 10%, 0.145MOHM, 30AMP MA

0
IMC1210SY330J

IMC1210SY330J

Vishay / Dale

FIXED IND 33UH 112MA 6 OHM SMD

0
CDRH3D14NP-100NC

CDRH3D14NP-100NC

Sumida Corporation

FIXED IND 10UH 690MA 262 MOHM

668
LQW15AN27NJ80D

LQW15AN27NJ80D

TOKO / Murata

FIXED IND 27NH 680MA 288 MOHM

0
AIUR-09-470M

AIUR-09-470M

Abracon

FIXED IND 47UH 1.7A 180 MOHM TH

0
SRR1005-390Y

SRR1005-390Y

J.W. Miller / Bourns

FIXED IND 39UH 1.05A 180MOHM SMD

0
CDRH127NP-331MC

CDRH127NP-331MC

Sumida Corporation

FIXED IND 330UH 950MA 640 MOHM

166
MLG0603P1N1STD25

MLG0603P1N1STD25

TDK Corporation

FIXED IND 1.1NH 1A 70 MOHM SMD

0
PA4320.334NLT

PA4320.334NLT

PulseLarsen Antenna

FIXED IND 330UH 1.7A 340 MOHM

513
AIAC-4125C-R130J-T

AIAC-4125C-R130J-T

Abracon

FIXED IND 130NH 3A 10.8 MOHM SMD

463
B82422A3181J100

B82422A3181J100

TDK EPCOS

FIXED IND 180NH 360MA 380 MOHM

0
CW100505-2N7D

CW100505-2N7D

J.W. Miller / Bourns

FIXED IND 2.7NH 640MA 120MOHM SM

0
7447649133

7447649133

Würth Elektronik Midcom

FIXED IND 33UH 320MA 3.64 OHM

933

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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