Fixed Inductors

Part Number	Description / PDF	Quantity
CDRH3D14NP-100NC Sumida Corporation	FIXED IND 10UH 690MA 262 MOHM	668
CDRH127NP-331MC Sumida Corporation	FIXED IND 330UH 950MA 640 MOHM	166
CDR6D23MNNP-330NC Sumida Corporation	FIXED IND 33UH 700MA 275 MOHM	0
0830CDMCCDS-1R5MC Sumida Corporation	FIXED IND 1.5UH 11.5A 9.4 MOHM	3000
CDPH4D19FNP-4R7MC Sumida Corporation	FIXED IND 4.7UH 3.3A 38 MOHM SMD	13716
CD30D22HF-101MC Sumida Corporation	FIXED IND 100UH 300MA 2.79 OHM	0
CDEP147NP-2R6MC-73 Sumida Corporation	FIXED IND 2.6UH 16A 4.97 MOHM	0
55081813400 Sumida Corporation	FIXED IND 180NH 260MA 470 MOHM	0
CDRH4D28NP-1R8NC Sumida Corporation	FIXED IND 1.8UH 2.2A 27.5 MOHM	0
CDMC104NP-R36M Sumida Corporation	FIXED IND 360NH 25A 1.1 MOHM SMD	224
CDR6D28MNNP-3R6NC Sumida Corporation	FIXED IND 3.6UH 2.5A 50 MOHM SMD	0
CDRH105RNP-1R5NC Sumida Corporation	FIXED IND 1.5UH 8.3A 5.8 MOHM	0
CDC5D23BNP-150KC Sumida Corporation	FIXED IND 15UH 880MA 166 MOHM	333
CDRH5D18NP-150NC Sumida Corporation	FIXED IND 15UH 970MA 196 MOHM	0
CDRH5D28RNP-120NC Sumida Corporation	FIXED IND 12UH 1.2A 71.6 MOHM	0
CDRH5D28RNP-330NC Sumida Corporation	FIXED IND 33UH 760MA 182.5 MOHM	0
CDRH127L125NP-681MC Sumida Corporation	FIXED IND 680UH 750MA 1.102OHM	638
54061513400 Sumida Corporation	FIXED IND 150NH 150MA 1.2 OHM	0
CDEP147NP-120MC-125 Sumida Corporation	FIXED IND 12UH 8.5A 13.31 MOHM	0
CDRH124NP-150MC Sumida Corporation	FIXED IND 15UH 3.2A 50 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