Fixed Inductors

Part Number	Description / PDF	Quantity
0512CDMCCDS-2R2MC Sumida Corporation	FIXED IND 2.2UH 3.6A 72.6MOHM SM	465
CDC5D23BNP-100LC Sumida Corporation	FIXED IND 10UH 1.04A 133 MOHM	3975
CD54NP-181KC Sumida Corporation	FIXED IND 180UH 380MA 1.38 OHM	0
CD104NP-330MC Sumida Corporation	FIXED IND 33UH 1.26A 120 MOHM	0
CR54NP-221KC Sumida Corporation	FIXED IND 220UH 350MA 1.57 OHM	0
CDRH127/LDNP-180MC Sumida Corporation	FIXED IND 18UH 5.1A 28 MOHM SMD	12
CD30D22HF-221MC Sumida Corporation	FIXED IND 220UH 190MA 5.94 OHM	0
CDRH8D43NP-3R9NC Sumida Corporation	FIXED IND 3.9UH 4.5A 19 MOHM SMD	0
0410CDMCCDS-R33MC Sumida Corporation	FIXED IND 330NH 6A 23MOHM SMD	0
CD75NP-390KC Sumida Corporation	FIXED IND 39UH 1.1A 160 MOHM SMD	0
CDR125NP-101MC Sumida Corporation	FIXED IND 100UH 1.05A 250 MOHM	570
CDR7D28MNNP-1R2NC Sumida Corporation	FIXED IND 1.2UH 4.5A 20.5 MOHM	18
0512CDMCCDS-R22MC Sumida Corporation	FIXED IND 220NH 10.6A 8.4MOHM SM	3989
CDEP147NP-1R8MC-73 Sumida Corporation	FIXED IND 1.8UH 17.5A 3.23 MOHM	0
CDRH8D43NP-101NC Sumida Corporation	FIXED IND 100UH 800MA 360 MOHM	1638
CDRH73NP-681MC-B Sumida Corporation	FIXED IND 680UH 190MA 5.73 OHM	0
55082703400 Sumida Corporation	FIXED IND 27NH 600MA 90 MOHM SMD	0
CDRH8D28HPNP-150NC Sumida Corporation	FIXED IND 15UH 1.7A 125 MOHM SMD	0
55083313400 Sumida Corporation	FIXED IND 330NH 180MA 1 OHM SMD	1838
CDR6D23MNNP-680NC Sumida Corporation	FIXED IND 68UH 450MA 751.3 MOHM	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