Fixed Inductors

Part Number	Description / PDF	Quantity
BMRA00060630R68MA1 Chilisin Electronics	FIXED IND 680NH 15A 6.3 MOHM SMD	1942
BSPQ000603042N7B00 Chilisin Electronics	THIN FILM RF INDUCTOR,HIGH Q	0
BPSD000504324R7K00 Chilisin Electronics	FIXED IND 4.7UH 94MOHM SMD	3961
BEBE00141208R33MMA Chilisin Electronics	INDUCTOR, PWR	0
BKPB002012104R7MA2 Chilisin Electronics	FIXED IND 4.7UH 700MA 260 MOHM	5915
BWVS00808040100M00 Chilisin Electronics	FIXED IND 10UH 3.8A 38 MOHM SMD	3872
BSCH0016080818NJ00 Chilisin Electronics	FIXED IND 18NH 600MA 350MOHM SMD	7500
ASCH001005056N8JCP Chilisin Electronics	FIXED IND 6.8NH 400MA 240 MOHM	19741
BSCQ000603035N6C00 Chilisin Electronics	FIXED IND 5.6NH 325MA 470 MOHM	14750
BSCH001005053N9SCP Chilisin Electronics	FIXED IND 3.9NH 400MA 180 MOHM	14605
ASCH001608088N2J00 Chilisin Electronics	FIXED IND 8.2NH 600MA 240 MOHM	7816
BWVS006060453R3M00 Chilisin Electronics	FIXED IND 3.3UH 4.3A 24 MOHM SMD	659
BSCH0006030347NJ00 Chilisin Electronics	FIXED IND 47NH 100MA 1.9OHM SMD	13339
BSCH0010050512NJCP Chilisin Electronics	FIXED IND 12NH 300MA 280MOHM SMD	19975
BWCS00161008R18G00 Chilisin Electronics	FIXED IND 180NH 240MA 1.25 OHM	7745
BMRA000505303R3MA1 Chilisin Electronics	FIXED IND 3.3UH 4.5A 46 MOHM SMD	1117
BWVF002520122R2M00 Chilisin Electronics	FIXED IND 2.2UH 1.8A 80 MOHM SMD	3984
BPSD000504323R3K00 Chilisin Electronics	FIXED IND 3.3UH 58MOHM SMD	3968
BWLS00161109100J00 Chilisin Electronics	FIXED IND 10UH 300MA 4.8 OHM SMD	6886
BSCH00160808R27J00 Chilisin Electronics	FIXED IND 270NH 150MA 2.2OHM SMD	7780

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