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Fixed Inductors

Image Part Number Description / PDF Quantity Rfq
L-15WR33KV4E

L-15WR33KV4E

Johanson Technology

FIXED IND 330NH 300MA 1.65 OHM

0
P1330-564G

P1330-564G

API Delevan

FIXED IND 560UH 138MA 6.96 OHM

0
L0805120GEWTR

L0805120GEWTR

Elco (AVX)

FIXED IND 12NH 750MA 200 MOHM

0
0805CS-182EGTS

0805CS-182EGTS

Delta Electronics

FIXED IND 1.8UH 170MA 2.5 OHM

3750
L-05B4N7SV6T

L-05B4N7SV6T

Johanson Technology

FIXED IND 4.7NH 300MA 500 MOHM

0
CDRH127/LDNP-180MC

CDRH127/LDNP-180MC

Sumida Corporation

FIXED IND 18UH 5.1A 28 MOHM SMD

12
IMC1210EB3R3K

IMC1210EB3R3K

Vishay / Dale

FIXED IND 3.3UH 260MA 1.2 OHM

0
BPSC00101140101M00

BPSC00101140101M00

Chilisin Electronics

FIXED IND 100UH 304MOHM SMD

1828
P1173.372NLT

P1173.372NLT

PulseLarsen Antenna

FIXED IND 3.7UH 8.3A 8.5 MOHM

0
SRU8028-150Y

SRU8028-150Y

J.W. Miller / Bourns

FIXED IND 15UH 2A 66 MOHM SMD

270
SP1008R-153K

SP1008R-153K

API Delevan

FIXED IND 15UH 232MA 2.1 OHM SMD

0
CKP20162R2M-T

CKP20162R2M-T

TAIYO YUDEN

FIXED IND 2.2UH 1.2A 140 MOHM

3563
HCM1A4020V2-R56-R

HCM1A4020V2-R56-R

PowerStor (Eaton)

FIXED IND 560NH 7.3A 15 MOHM SMD

0
5800-182-RC

5800-182-RC

J.W. Miller / Bourns

FIXED IND 1.8MH 180MA 4.4 OHM TH

0
B82464P4154M000

B82464P4154M000

TDK EPCOS

FIXED IND 150UH 850MA 320 MOHM

740
ER153722KS

ER153722KS

API Delevan

FIXED IND 2.7UH 385MA 1.2 OHM TH

394
KLZ2012MHR1R0HTD25

KLZ2012MHR1R0HTD25

TDK Corporation

FIXED IND 1UH 800MA 130 MOHM SMD

2695
0819-62J

0819-62J

API Delevan

FIXED IND 39UH 83.5MA 6.8 OHM TH

0
0402HP-1N0ECTS

0402HP-1N0ECTS

Delta Electronics

FIXED IND 1NH 2.3A 30 MOHM SMD

6773
B82144A2225J000

B82144A2225J000

TDK EPCOS

FIXED IND 2.2MH 120MA 9 OHM TH

989

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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