Fixed Inductors

Part Number	Description / PDF	Quantity
CDRH6D28NP-100NC Sumida Corporation	FIXED IND 10UH 1.7A 65 MOHM SMD	40220
0630CDMCCDS-R47MC Sumida Corporation	FIXED IND 470NH 20A 4.1 MOHM	4500
CDEP15D90T150NP-100MC-125 Sumida Corporation	FIXED IND 10UH 12.5A 7.9 MOHM	6
CDRH5D14NP-2R0NC Sumida Corporation	FIXED IND 2UH 3.1A 33.8 MOHM SMD	0
CD43NP-5R6MC Sumida Corporation	FIXED IND 5.6UH 1.48A 125.7 MOHM	0
0410CDMCCDS-R56MC Sumida Corporation	FIXED IND 560NH 4.5A 34.5MOHM SM	5985
CDRH125NP-820MC Sumida Corporation	FIXED IND 82UH 1.4A 140 MOHM SMD	1344
CD43NP-1R4MC Sumida Corporation	FIXED IND 1.4UH 2.5A 56.2 MOHM	0
CDRH127NP-120MC Sumida Corporation	FIXED IND 12UH 4.9A 24.3 MOHM	3122
177CDMCCDS-330MC Sumida Corporation	FIXED IND 33UH 7.2A 38MOHM SMD	162
CD104NP-390MC Sumida Corporation	FIXED IND 39UH 1.2A 151 MOHM SMD	0
CR43NP-2R2MC Sumida Corporation	FIXED IND 2.2UH 1.75A 71.2 MOHM	3486
CDRH6D28NP-390NC Sumida Corporation	FIXED IND 39UH 860MA 210 MOHM	0
CDRH74NP-271MC-B Sumida Corporation	FIXED IND 270UH 340MA 1.64 OHM	0
54066803400 Sumida Corporation	FIXED IND 68NH 280MA 360 MOHM	0
CDRH125/LDNP-221MC Sumida Corporation	FIXED IND 220UH 1.08A 395 MOHM	0
CDR7D43MNNP-3R7NC Sumida Corporation	FIXED IND 3.7UH 4.3A 18.9 MOHM	0
55081513400 Sumida Corporation	FIXED IND 150NH 270MA 440 MOHM	0
CDRH125NP-681MC Sumida Corporation	FIXED IND 680UH 480MA 1.2 OHM	0
CDRH104RNP-331NC Sumida Corporation	FIXED IND 330UH 520MA 1.09 OHM	272

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