Fixed Inductors

Part Number	Description / PDF	Quantity
CDRH62BNP-330MC-B Sumida Corporation	FIXED IND 33UH 590MA 450 MOHM	0
CDRH2D09CNP-150NC Sumida Corporation	FIXED IND 15UH 420MA 650 MOHM	0
CDRH3D14NP-3R3NC Sumida Corporation	FIXED IND 3.3UH 1.24A 100 MOHM	19
CDRH4D22HPNP-560MC Sumida Corporation	FIXED IND 56UH 480MA 810 MOHM	0
CDR125NP-680MC Sumida Corporation	FIXED IND 68UH 1.26A 170 MOHM	0
CDPH28D11FNP-2R2MC Sumida Corporation	FIXED IND 2.2UH 1.72A 96 MOHM	0
CDRH6D28NP-120NC Sumida Corporation	FIXED IND 12UH 1.55A 70 MOHM SMD	7
55082713400 Sumida Corporation	FIXED IND 270NH 180MA 1 OHM SMD	350
CDMC6D28NP-R47MC Sumida Corporation	FIXED IND 470NH 14A 4.2 MOHM SMD	15426
CD73NP-100MC Sumida Corporation	FIXED IND 10UH 1.44A 80.3 MOHM	0
0410CDMCCDS-R15MC Sumida Corporation	FIXED IND 150NH 13A 6.3MOHM SMD	2512
CDRH4D28CNP-330PC Sumida Corporation	FIXED IND 33UH 700MA 331 MOHM	0
CDPH28D11FNP-3R3MC Sumida Corporation	FIXED IND 3.3UH 1.42A 128 MOHM	0
CD75NP-391KC Sumida Corporation	FIXED IND 390UH 360MA 1.77 OHM	0
CDRH3D18NP-330NC Sumida Corporation	FIXED IND 33UH 450MA 640 MOHM	0
0512CDMCCDS-R33MC Sumida Corporation	FIXED IND 330NH 10.7A 10.8MOHM	3868
RCP1317NP-681L Sumida Corporation	FIXED IND 680UH 1A 780 MOHM TH	0
CDPH4D19FNP-150MC Sumida Corporation	FIXED IND 15UH 1.88A 95 MOHM SMD	225
CDRH125NP-181MC Sumida Corporation	FIXED IND 180UH 900MA 290 MOHM	0
CDRH127/LDNP-390MC Sumida Corporation	FIXED IND 39UH 3.5A 60.5 MOHM	136

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