Fixed Inductors

Part Number	Description / PDF	Quantity
BMRF001010403R3MA1 Chilisin Electronics	FIXED IND 3.3UH 11A 13.2 MOHM	805
BMRA000505301R0MA1 Chilisin Electronics	FIXED IND 1UH 7A 15 MOHM SMD	1508
BWCS001610085N6G00 Chilisin Electronics	FIXED IND 5.6NH 700MA 170 MOHM	0
BSCH00100505R12JCS Chilisin Electronics	FIXED IND 120NH 100MA 2.2OHM SMD	19741
BSCH0016080868NJ00 Chilisin Electronics	FIXED IND 68NH 400MA 850MOHM SMD	7586
BKPB002520104R7MA2 Chilisin Electronics	FIXED IND 4.7UH 1A 140MOHM SMD	6000
BKPB002012101R0MA2 Chilisin Electronics	FIXED IND 1UH 1.2A 120MOHM SMD	5785
BSCH000603032N7S00 Chilisin Electronics	FIXED IND 2.7NH 340MA 210 MOHM	25514
BSCH001608082N7S00 Chilisin Electronics	FIXED IND 2.7NH 600MA 100 MOHM	5739
BWCS00161008R12G00 Chilisin Electronics	FIXED IND 120NH 300MA 750 MOHM	3732
BSCH001005052N2SCP Chilisin Electronics	FIXED IND 2.2NH 400MA 120 MOHM	6911
BSCH000603032N0S00 Chilisin Electronics	FIXED IND 2NH 380MA 170MOHM SMD	9412
BSCH001005057N5JCP Chilisin Electronics	FIXED IND 7.5NH 300MA 240 MOHM	19742
BSCH000603039N1J00 Chilisin Electronics	FIXED IND 9.1NH 220MA 480 MOHM	28970
BSCH0016080812NJ00 Chilisin Electronics	FIXED IND 12NH 600MA 280MOHM SMD	4989
BWVS005050203R3M00 Chilisin Electronics	FIXED IND 3.3UH 2.8A 48 MOHM SMD	0
BWCS0016100882NG00 Chilisin Electronics	FIXED IND 82NH 400MA 540MOHM SMD	42649
BMRA00060630220MA1 Chilisin Electronics	FIXED IND 22UH 3A 145 MOHM SMD	304
BWCS002928214R7G00 Chilisin Electronics	FIXED IND 4.7UH 260MA 4OHM SMD	2968
BDHE00201610R47MQ1 Chilisin Electronics	FIXED IND 470NH 4.2A 42 MOHM SMD	4975

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