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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
SRP1040-1R0M

SRP1040-1R0M

J.W. Miller / Bourns

FIXED IND 1UH 20A 3.5 MOHM SMD

398
LBM2016T220JV

LBM2016T220JV

TAIYO YUDEN

FIXED IND 22UH 140MA 3.64 OHM

0
ISC1812RQ101J

ISC1812RQ101J

Vishay / Dale

FIXED IND 100UH 147MA 3.25 OHM

0
74437346015

74437346015

Würth Elektronik Midcom

FIXED IND 1.5UH 7.2A 15 MOHM SMD

2555
AISC-1210-1R5J-T

AISC-1210-1R5J-T

Abracon

FIXED IND 1.5UH 310MA 1.95 OHM

0
SDR6603-471M

SDR6603-471M

J.W. Miller / Bourns

FIXED IND 470UH 150MA 5.1OHM SMD

774
NS10155T2R2NNA

NS10155T2R2NNA

TAIYO YUDEN

FIXED IND 2.2UH 7.61A 8.4 MOHM

0
ASPI-0310FS-1R5N-T2

ASPI-0310FS-1R5N-T2

Abracon

FIXED IND 1.5UH 2A 70 MOHM SMD

0
ISC1210ER47NM

ISC1210ER47NM

Vishay / Dale

FIXED IND 47NH 495MA 260 MOHM

0
SL3732C-R15KHF

SL3732C-R15KHF

ITG Electronics, Inc.

0.15UH, 10%, 0.29MOHM, 66AMP MAX

0
NRS6012T4R7MMGG

NRS6012T4R7MMGG

TAIYO YUDEN

FIXED IND 4.7UH 1.55A 150 MOHM

48
ISC1812ER821J

ISC1812ER821J

Vishay / Dale

FIXED IND 820UH 72MA 13.5 OHM

0
LQW03AW8N7C00D

LQW03AW8N7C00D

TOKO / Murata

FIXED IND 8.7NH 290MA 420 MOHM

0
S1812R-684K

S1812R-684K

API Delevan

FIXED IND 680UH 79MA 32 OHM SMD

426
5900-221-RC

5900-221-RC

J.W. Miller / Bourns

FIXED IND 220UH 1.5A 185 MOHM TH

702
B82464P4682M000

B82464P4682M000

TDK EPCOS

FIXED IND 6.8UH 4.3A 20 MOHM SMD

750
4922R-33L

4922R-33L

API Delevan

FIXED IND 470UH 350MA 3.25 OHM

1334
LQW2BAN62NG00L

LQW2BAN62NG00L

TOKO / Murata

FIXED IND 62NH 1.65A 120 MOHM

1607
ELL-8TP471MB

ELL-8TP471MB

Panasonic

FIXED IND 470UH 480MA 1 OHM SMD

789
SDR0302-151KL

SDR0302-151KL

J.W. Miller / Bourns

FIXED IND 150UH 200MA 4.6OHM SMD

1518

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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