Fixed Inductors

Part Number	Description / PDF	Quantity
BWLS001611094R7J00 Chilisin Electronics	FIXED IND 4.7UH 420MA 2.1 OHM	11738
BWVS006060282R2M00 Chilisin Electronics	FIXED IND 2.2UH 4A 20 MOHM SMD	2969
BWVF002520104R7M00 Chilisin Electronics	FIXED IND 4.7UH 950MA 285 MOHM	3969
BWCS0016100822NG00 Chilisin Electronics	FIXED IND 22NH 700MA 190MOHM SMD	0
BMRA000505202R2MA1 Chilisin Electronics	FIXED IND 2.2UH 4A 45 MOHM SMD	920
BWCS0016100868NG00 Chilisin Electronics	FIXED IND 68NH 600MA 340MOHM SMD	63003
BPSC00101151100M00 Chilisin Electronics	FIXED IND 10UH 28MOHM SMD	940
BWCS001610088N2G00 Chilisin Electronics	FIXED IND 8.2NH 700MA 109 MOHM	7959
BWVS00606045470M00 Chilisin Electronics	FIXED IND 47UH 1.2A 245 MOHM SMD	1938
BWVF003030122R2M00 Chilisin Electronics	FIXED IND 2.2UH 2A 92 MOHM SMD	3313
BSCH001005059N1JCP Chilisin Electronics	FIXED IND 9.1NH 300MA 260 MOHM	17740
BSPQ000603042N2B00 Chilisin Electronics	THIN FILM RF INDUCTOR,HIGH Q	0
BKPB002016102R2MA2 Chilisin Electronics	FIXED IND 2.2UH 1A 130MOHM SMD	3000
BPSD00060530100K00 Chilisin Electronics	FIXED IND 10UH 120MOHM SMD	3950
BDCD002016101R0MS1 Chilisin Electronics	FIXED IND 1UH 2.3A 96 MOHM SMD	11955
BSCH001608083N3S00 Chilisin Electronics	FIXED IND 3.3NH 600MA 120 MOHM	2617
BMRF00101040R36MD1 Chilisin Electronics	FIXED IND 360NH 34A 1.2 MOHM SMD	990
BMRA000505304R7MA1 Chilisin Electronics	FIXED IND 4.7UH 4A 60 MOHM SMD	1854
BWCS0016100827NG00 Chilisin Electronics	FIXED IND 27NH 600MA 220MOHM SMD	39829
BWVF00303012100M00 Chilisin Electronics	FIXED IND 10UH 1A 420 MOHM SMD	2965

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