Fixed Inductors

Part Number	Description / PDF	Quantity
CDRH4D28NP-121NC Sumida Corporation	FIXED IND 120UH 270MA 1.27 OHM	0
CDEP147NP-6R1MC-95 Sumida Corporation	FIXED IND 6.1UH 11A 7.8 MOHM SMD	0
CR32NP-8R2MC Sumida Corporation	FIXED IND 8.2UH 780MA 228 MOHM	0
CDRH73NP-331MC-B Sumida Corporation	FIXED IND 330UH 280MA 2.62 OHM	0
0624CDMCCDS-100MC Sumida Corporation	FIXED IND 10UH 3.1A 101 MOHM	1548
0412CDMCCDS-R68MC Sumida Corporation	FIXED IND 680NH 4.7A 36 MOHM	0
CDRH2D14NP-3R9NC Sumida Corporation	FIXED IND 3.9UH 1.12A 138 MOHM	0
CDH74NP-331JC Sumida Corporation	FIXED IND 330UH 400MA 1.55 OHM	0
CDRH4D28CLDNP-6R8PC Sumida Corporation	FIXED IND 6.8UH 2.4A 48.8 MOHM	33
177CDMCCDS-470MC Sumida Corporation	FIXED IND 47UH 6.5A 49.2MOHM SMD	343
CDRR75NP-102MC Sumida Corporation	FIXED IND 1MH 220MA 3.056 OHM	0
CDRH5D28NP-270NC Sumida Corporation	FIXED IND 27UH 850MA 175 MOHM	0
CDRH125/LDNP-100NC Sumida Corporation	FIXED IND 10UH 4.6A 29 MOHM SMD	6
CDPH45D16FHF-100MC Sumida Corporation	FIXED IND 10UH 1.45A 161 MOHM	0
CD54NP-221KC Sumida Corporation	FIXED IND 220UH 350MA 1.57 OHM	0
CR43NP-150MC Sumida Corporation	FIXED IND 15UH 850MA 235 MOHM	2700
CDR6D28MNNP-2R7NC Sumida Corporation	FIXED IND 2.7UH 2.7A 43.8 MOHM	0
0420CDMCCDS-R47MC Sumida Corporation	FIXED IND 470NH 9A 14 MOHM SMD	4680
CDRH3D18NP-120NC Sumida Corporation	FIXED IND 12UH 800MA 275 MOHM	0
CD43NP-100MC Sumida Corporation	FIXED IND 10UH 1.04A 182 MOHM	1022

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