Fixed Inductors

Part Number	Description / PDF	Quantity
BWVS00505040100M00 Chilisin Electronics	FIXED IND 10UH 2.2A 60 MOHM SMD	1726
BWVS004040184R7M00 Chilisin Electronics	FIXED IND 4.7UH 1.7A 90 MOHM SMD	585
BSCH0006030333NJ00 Chilisin Electronics	FIXED IND 33NH 110MA 1.47OHM SMD	28744
BWCS001207074N3H00 Chilisin Electronics	FIXED IND 4.3NH 700MA 91MOHM SMD	8000
BWCS0016100833NG00 Chilisin Electronics	FIXED IND 33NH 600MA 220MOHM SMD	4000
BSCQ000603032N2B00 Chilisin Electronics	FIXED IND 2.2NH 500MA 200 MOHM	27838
BSCH000603036N2S00 Chilisin Electronics	FIXED IND 6.2NH 250MA 380 MOHM	26660
BPSC000505304R7MS0 Chilisin Electronics	FIXED IND 4.7UH 162MOHM SMD	3990
BSCQ000603032N7B00 Chilisin Electronics	FIXED IND 2.7NH 400MA 320 MOHM	25072
BMRA000404122R2MA1 Chilisin Electronics	FIXED IND 2.2UH 2.75A 83.5 MOHM	3975
BSCH001005054N7SCP Chilisin Electronics	FIXED IND 4.7NH 400MA 180 MOHM	25247
BSCQ000603031N8B00 Chilisin Electronics	FIXED IND 1.8NH 640MA 120 MOHM	28890
BSCH0006030339NJ00 Chilisin Electronics	FIXED IND 39NH 100MA 1.72OHM SMD	29975
BSPQ000603041N0B00 Chilisin Electronics	THIN FILM RF INDUCTOR,HIGH Q	0
BMRA000606304R7MA1 Chilisin Electronics	FIXED IND 4.7UH 5.5A 40 MOHM SMD	1076
BWVF00303015100M00 Chilisin Electronics	FIXED IND 10UH 1A 360 MOHM SMD	3893
BWVH002520121R0M00 Chilisin Electronics	FIXED IND 1UH 2.6A 37 MOHM SMD	6686
BSCH0006030327NJ00 Chilisin Electronics	FIXED IND 27NH 120MA 1.35OHM SMD	29492
BPSD00050432100K00 Chilisin Electronics	FIXED IND 10UH 182MOHM SMD	3984
BSCQ000603031N2B00 Chilisin Electronics	FIXED IND 1.2NH 800MA 80MOHM SMD	28920

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