Fixed Inductors

Part Number	Description / PDF	Quantity
CDH2D09BNP-3R3MC Sumida Corporation	FIXED IND 3.3UH 1.06A 188 MOHM	0
CDRH6D28NP-150NC Sumida Corporation	FIXED IND 15UH 1.4A 84 MOHM SMD	495
CDRH2D11NP-4R7NC Sumida Corporation	FIXED IND 4.7UH 880MA 170 MOHM	1000
CDH74NP-181JC Sumida Corporation	FIXED IND 180UH 660MA 820 MOHM	0
CD104NP-680KC Sumida Corporation	FIXED IND 68UH 910MA 223 MOHM	0
CDRH5D28NP-180NC Sumida Corporation	FIXED IND 18UH 1A 110 MOHM SMD	0
55082203400 Sumida Corporation	FIXED IND 22NH 600MA 90 MOHM SMD	0
CLS62NP-120NC Sumida Corporation	FIXED IND 12UH 616MA 220 MOHM	1794
CDH74NP-180LC Sumida Corporation	FIXED IND 18UH 1.95A 94 MOHM SMD	0
104CDMCCDS-2R2MC Sumida Corporation	FIXED IND 2.2UH 15A 7 MOHM SMD	2101
CDH115NP-151KC Sumida Corporation	FIXED IND 150UH 760MA 400 MOHM	0
CDRH124NP-470MC Sumida Corporation	FIXED IND 47UH 1.9A 150 MOHM SMD	3
CDRH3D28NP-4R7NC Sumida Corporation	FIXED IND 4.7UH 1.62A 88.3 MOHM	601
CDH2D09BNP-6R4MC Sumida Corporation	FIXED IND 6.4UH 640MA 400 MOHM	0
CR32NP-120KC Sumida Corporation	FIXED IND 12UH 685MA 270 MOHM	0
CDRH3D16NP-R26NC Sumida Corporation	FIXED IND 260NH 3.6A 27.5 MOHM	0
0530CDMCCDS-2R2MC Sumida Corporation	FIXED IND 2.2UH 5.8A 29 MOHM	1523
CDR125NP-220MC Sumida Corporation	FIXED IND 22UH 2.2A 70 MOHM SMD	3152
CDRH62BNP-101MC-B Sumida Corporation	FIXED IND 100UH 340MA 1.39 OHM	0
CDRH124NP-8R2MC Sumida Corporation	FIXED IND 8.2UH 4.6A 26 MOHM SMD	0

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