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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
M27/367-05

M27/367-05

API Delevan

FIXED IND 470NH 6A 10 MOHM SMD

0
ETQ-P3W3R3WFN

ETQ-P3W3R3WFN

Panasonic

FIXED IND 3.3UH 7.4A 28.8 MOHM

0
SWT-2.74-24

SWT-2.74-24

Amgis

FIXED IND 24UH 2.74A 70 MOHM TH

0
DRA125-151-R

DRA125-151-R

PowerStor (Eaton)

FIXED IND 150UH 1.409A 273 MOHM

58
L1007C4R7MPWST

L1007C4R7MPWST

KEMET

FIXED IND 4.7UH 240MA 130 MOHM

1444
ER1537-30KR

ER1537-30KR

API Delevan

FIXED IND 5.6UH 495MA 320 MOHM

537
ELJ-PE18NKFA

ELJ-PE18NKFA

Panasonic

FIXED IND 18NH 800MA 120 MOHM

42
MHQ1005P11NGTD25

MHQ1005P11NGTD25

TDK Corporation

FIXED IND 11NH 450MA 240 MOHM

0
CD75NP-390KC

CD75NP-390KC

Sumida Corporation

FIXED IND 39UH 1.1A 160 MOHM SMD

0
B82422T3560K000

B82422T3560K000

TDK EPCOS

FIXED IND 56NH 450MA 210 MOHM

0
NRS5030TR47NMGJV

NRS5030TR47NMGJV

TAIYO YUDEN

FIXED IND 470NH 5A 13 MOHM SMD

0
0805CT-102EKFS

0805CT-102EKFS

Delta Electronics

FIXED IND 1UH 450MA 900 MOHM SMD

3480
MCL1005-9R1-R

MCL1005-9R1-R

PowerStor (Eaton)

FIXED IND 9.1NH 300MA 400 MOHM

0
CDR125NP-101MC

CDR125NP-101MC

Sumida Corporation

FIXED IND 100UH 1.05A 250 MOHM

570
5022R-754F

5022R-754F

API Delevan

FIXED IND 750UH 112MA 28.6 OHM

0
1-2176075-9

1-2176075-9

TE Connectivity AMP Connectors

FIXED IND 1.9NH 200MA 550 MOHM

0
MPEV1D1040L4R7

MPEV1D1040L4R7

KEMET

METAL INDUCTOR , A, MOHM, AEC-Q2

0
LK1005R47K-TV

LK1005R47K-TV

TAIYO YUDEN

FIXED IND 470NH 20MA 420 MOHM

15949
1025-76K

1025-76K

API Delevan

FIXED IND 220UH 52MA 21 OHM TH

7218
LQW15AN9N9G8ZD

LQW15AN9N9G8ZD

TOKO / Murata

FIXED IND 9.9NH 1.4A 81 MOHM

8459

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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