Fixed Inductors

Part Number	Description / PDF	Quantity
BWVS00606028330M00 Chilisin Electronics	FIXED IND 33UH 1.4A 220 MOHM SMD	2970
BWCS00231715R10G00 Chilisin Electronics	FIXED IND 100NH 400MA 460 MOHM	3723
BWCS00292821R15G00 Chilisin Electronics	FIXED IND 150NH 580MA 700 MOHM	3865
BWVF00252012100M00 Chilisin Electronics	FIXED IND 10UH 700MA 385 MOHM	3990
BWVS006060284R7M00 Chilisin Electronics	FIXED IND 4.7UH 3.2A 38 MOHM SMD	1491
BWVS00808040220M00 Chilisin Electronics	FIXED IND 22UH 2.6A 80 MOHM SMD	2313
BSCH001608084N7S00 Chilisin Electronics	FIXED IND 4.7NH 600MA 160 MOHM	7942
BSCQ000603033N9B00 Chilisin Electronics	FIXED IND 3.9NH 350MA 410 MOHM	26924
BWCS001207077N5H00 Chilisin Electronics	FIXED IND 7.5NH 680MA 100 MOHM	8000
BMRA000404203R3MA1 Chilisin Electronics	FIXED IND 3.3UH 2.5A 87 MOHM SMD	3994
EHEI201608A-R47M-Q7DG Chilisin Electronics	FIXED IND 470NH 4.1A 24 MOHM SMD	3129
BWVS00505020100M00 Chilisin Electronics	FIXED IND 10UH 1.6A 120 MOHM SMD	3990
BWCS00161008R10G00 Chilisin Electronics	FIXED IND 100NH 400MA 580 MOHM	23800
BWVF004040264R7M00 Chilisin Electronics	FIXED IND 4.7UH 2A 92 MOHM SMD	937
BWLS003025221R8J00 Chilisin Electronics	FIXED IND 1.8UH 1.05A 750 MOHM	3918
BWCS00161008R11G00 Chilisin Electronics	FIXED IND 110NH 300MA 610 MOHM	7890
BWVF00252012220M00 Chilisin Electronics	FIXED IND 22UH 530MA 810 MOHM	3979
BDCCDG201208R47MFC Chilisin Electronics	POWER INDUCTOR FIXED SMD	3000
BDHHDG201208R47MFC Chilisin Electronics	FIXED INDUCTOR 470NH SMD	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

Type	Functional Characteristics	Application Examples
Wirewound Inductors	High precision, high current handling, low resistance	Power supplies, DC-DC converters
Chip Inductors	Compact SMD package, stable performance at high frequencies	Mobile devices, RF circuits
Ferrite Bead Inductors	Effective high-frequency noise suppression	EMI filtering in digital circuits
Thin-Film Inductors	Ultra-compact, high Q-factor, tight tolerance	5G 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

Parameter	Description	Importance
Inductance (L)	Measured in henrys (H), determines energy storage capacity	Defines filtering/energy storage performance
Rated Current (I_rated)	Maximum DC current before saturation	Prevents core saturation and failure
DC Resistance (DCR)	Resistance of coil windings	Affects efficiency and thermal performance
Self-Resonant Frequency (SRF)	Frequency where inductor behaves as capacitor	Limits effective operating frequency range
Q Factor	Quality factor indicating efficiency	Higher 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

Manufacturer	Representative Product	Key Features
Murata	LQH3NPN100M	10 H, 1.2A, 1.8 1.4mm chip inductor
TDK	MLZ2012A100T	100MHz SRF, 1.0 1.25mm for RF circuits
Vishay	IHLP2525CZER1R0M	1 H, 12A, composite construction
Coilcraft	0402DC-103J	10 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