Fixed Inductors

Part Number	Description / PDF	Quantity
BMRA00060630150MA1 Chilisin Electronics	FIXED IND 15UH 3A 122 MOHM SMD	1762
BMRB00060630100MA1 Chilisin Electronics	FIXED IND 10UH 4A 68 MOHM SMD	2000
BSCH001608088N2J00 Chilisin Electronics	FIXED IND 8.2NH 600MA 240 MOHM	11892
BSCH0016080882NJ00 Chilisin Electronics	FIXED IND 82NH 300MA 1OHM SMD	7239
BWVS00404018150M00 Chilisin Electronics	FIXED IND 15UH 1A 250 MOHM SMD	1415
APSA00070748681M00 Chilisin Electronics	FIXED IND 680UH 270MA 1.77 OHM	1990
BWCS002928211R8G00 Chilisin Electronics	FIXED IND 1.8UH 300MA 2.6OHM SMD	3900
BWVS006060454R7M00 Chilisin Electronics	FIXED IND 4.7UH 3.9A 31 MOHM SMD	1933
BDCD002520101R0MS1 Chilisin Electronics	FIXED IND 1UH 3A 78 MOHM SMD	8200
BSPQ000603043N0B00 Chilisin Electronics	THIN FILM RF INDUCTOR,HIGH Q	0
BWCS00231715R82G00 Chilisin Electronics	FIXED IND 820NH 180MA 2.35 OHM	4000
AWVF00404015220M00 Chilisin Electronics	FIXED IND 22UH 850MA 400 MOHM	2000
BSCH001005058N2JCP Chilisin Electronics	FIXED IND 8.2NH 300MA 240 MOHM	8470
BWVS00808040470M00 Chilisin Electronics	FIXED IND 47UH 1.75A 160 MOHM	1715
BMRA000606303R3MA1 Chilisin Electronics	FIXED IND 3.3UH 6A 35 MOHM SMD	1184
BPSC00131380220M00 Chilisin Electronics	FIXED IND 22UH 48MOHM SMD	911
BWVF00252010100M00 Chilisin Electronics	FIXED IND 10UH 700MA 535 MOHM	3985
BWCS0016100810NG00 Chilisin Electronics	FIXED IND 10NH 700MA 130MOHM SMD	0
BPSC00101140150M00 Chilisin Electronics	FIXED IND 15UH 55MOHM SMD	5892
BWCS0023171539NG00 Chilisin Electronics	FIXED IND 39NH 500MA 290MOHM SMD	4000

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