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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
744917039

744917039

Würth Elektronik Midcom

FIXED IND 3.9NH 1.6A 39 MOHM SMD

0
P3519R-185J

P3519R-185J

API Delevan

FIXED IND 1.8MH 91MA 35.88 OHM

0
UP2-471-R

UP2-471-R

PowerStor (Eaton)

FIXED IND 470UH 550MA 1.31 OHM

0
MLF1005G1R5JT

MLF1005G1R5JT

TDK Corporation

FIXED IND 1.5UH 35MA 950 MOHM

0
S1812R-333J

S1812R-333J

API Delevan

FIXED IND 33UH 258MA 3 OHM SMD

0
1225AS-H-100M=P2

1225AS-H-100M=P2

TOKO / Murata

FIXED IND 10UH 850MA 300 MOHM

408
MLF2012E120KT000

MLF2012E120KT000

TDK Corporation

FIXED IND 12UH 15MA 900 MOHM SMD

622
ASPI-0410FS-4R7M-T35

ASPI-0410FS-4R7M-T35

Abracon

FIXED IND 4.7UH 900MA 210 MOHM

0
IHLP3232DZER220M11

IHLP3232DZER220M11

Vishay / Dale

FIXED IND 22UH 4.3A 94.2 MOHM

4813
PQ108081-561MHF

PQ108081-561MHF

ITG Electronics, Inc.

FIXED IND 560UH 4A 95 MOHM SMD

20
IMC1812RQ82NM

IMC1812RQ82NM

Vishay / Dale

FIXED IND 82NH 450MA 400 MOHM

0
MDH10060C-471MA=P3

MDH10060C-471MA=P3

TOKO / Murata

FIXED IND 470UH 560MA 750 MOHM

465
0819-50K

0819-50K

API Delevan

FIXED IND 12UH 126MA 3 OHM TH

0
PG0087.103NL

PG0087.103NL

PulseLarsen Antenna

FIXED IND 10UH 1.2A 124 MOHM SMD

0
SDEM25201B-2R2MS

SDEM25201B-2R2MS

Delta Electronics

FIXED IND 2.2UH 2.05A 117MOHM SM

3344
S1210-182G

S1210-182G

API Delevan

FIXED IND 1.8UH 498MA 650 MOHM

0
AMPLA1004S-R39MT

AMPLA1004S-R39MT

Abracon

FIXED IND 390NH 30A 1.3 MOHM SMD

0
RL875S-390L-RC

RL875S-390L-RC

J.W. Miller / Bourns

FIXED IND 39UH 1.2A 150 MOHM TH

0
LMLP04B4M680CTAS

LMLP04B4M680CTAS

Elco (AVX)

FIXED IND 68UH 320MA 1OHM SMD

3500
LQW15AN3N5B80D

LQW15AN3N5B80D

TOKO / Murata

FIXED IND 3.5NH 1.95A 30 MOHM

0

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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