Fixed Inductors

Part Number	Description / PDF	Quantity
BWVF003030124R7M00 Chilisin Electronics	FIXED IND 4.7UH 1.52A 180 MOHM	3875
BSCH000603034N3S00 Chilisin Electronics	FIXED IND 4.3NH 280MA 300 MOHM	27962
BWCS00231715R22G00 Chilisin Electronics	FIXED IND 220NH 400MA 700 MOHM	3851
BSCH0010050515NJCP Chilisin Electronics	FIXED IND 15NH 300MA 320MOHM SMD	16873
BWCS0023171533NG00 Chilisin Electronics	FIXED IND 33NH 500MA 270MOHM SMD	3980
BSPQ000603045N6H00 Chilisin Electronics	THIN FILM RF INDUCTOR,HIGH Q	0
BSPQ000603048N2H00 Chilisin Electronics	THIN FILM RF INDUCTOR,HIGH Q	0
BWVS004040181R5M00 Chilisin Electronics	FIXED IND 1.5UH 2.6A 40 MOHM SMD	1195
BWCS001610083N3H00 Chilisin Electronics	FIXED IND 3.3NH 700MA 45MOHM SMD	7929
BPSD000504321R0K00 Chilisin Electronics	FIXED IND 1UH 33MOHM SMD	3920
APSC00101140150M00 Chilisin Electronics	FIXED IND 15UH 55MOHM SMD	5845
BWVS00505040220M00 Chilisin Electronics	FIXED IND 22UH 1.4A 135 MOHM SMD	2783
BPSD000605454R7K00 Chilisin Electronics	FIXED IND 4.7UH 37.2MOHM SMD	2979
BPSC000303162R2T00 Chilisin Electronics	FIXED IND 2.2UH 1.6A 94 MOHM SMD	2000
BKPB002520124R7MA2 Chilisin Electronics	FIXED IND 4.7UH 1A 140MOHM SMD	5950
BSCH000603036N8J00 Chilisin Electronics	FIXED IND 6.8NH 250MA 390 MOHM	28262
BWCS00161008R15G00 Chilisin Electronics	FIXED IND 150NH 280MA 920 MOHM	7625
BMRA00060630R33MA1 Chilisin Electronics	FIXED IND 330NH 20A 4.2 MOHM SMD	1941
BSPQ000603041N2B00 Chilisin Electronics	THIN FILM RF INDUCTOR,HIGH Q	0
BDCD002520122R2MS1 Chilisin Electronics	FIXED IND 2.2UH 2.3A 115 MOHM	33

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