Fixed Inductors

Part Number	Description / PDF	Quantity
CDR6D28MNNP-1R5NC Sumida Corporation	FIXED IND 1.5UH 3A 31.5 MOHM SMD	0
CDEP147NP-4R7MC-73 Sumida Corporation	FIXED IND 4.7UH 11A 7.8 MOHM SMD	600
CDRH3D16NP-150NC Sumida Corporation	FIXED IND 15UH 450MA 295 MOHM	263
CDRH6D28NP-470NC Sumida Corporation	FIXED IND 47UH 800MA 238 MOHM	10439
CDR7D28MNNP-101NC Sumida Corporation	FIXED IND 100UH 650MA 655 MOHM	2691
CDRH4D18NP-150NC Sumida Corporation	FIXED IND 15UH 500MA 240 MOHM	551
CDMC6D28NP-1R5MC Sumida Corporation	FIXED IND 1.5UH 7.6A 12.5 MOHM	0
RCR110DNP-100M Sumida Corporation	FIXED IND 10UH 3.51A 23 MOHM TH	97
0512CDMCCDS-4R7MC Sumida Corporation	FIXED IND 4.7UH 2.3A 166.2MOHM	3974
CDRH4D22NP-151NC Sumida Corporation	FIXED IND 150UH 470MA 1.35 OHM	0
CR75NP-270KC Sumida Corporation	FIXED IND 27UH 1.3A 120 MOHM SMD	0
CMD5D13NP-470MC Sumida Corporation	FIXED IND 47UH 350MA 875 MOHM	0
RCP1317NP-820M Sumida Corporation	FIXED IND 82UH 2.5A 110 MOHM TH	0
CD104NP-121KC Sumida Corporation	FIXED IND 120UH 690MA 396 MOHM	0
CDRH104RNP-560NC Sumida Corporation	FIXED IND 56UH 1A 230 MOHM SMD	0
CDR6D28MNNP-150NC Sumida Corporation	FIXED IND 15UH 1.4A 135 MOHM SMD	0
CDRH4D16NP-3R0NC Sumida Corporation	FIXED IND 3UH 2.3A 53 MOHM SMD	0
CD43NP-8R2MC Sumida Corporation	FIXED IND 8.2UH 1.37A 146.2 MOHM	0
CDRH125NP-391MC Sumida Corporation	FIXED IND 390UH 650MA 690 MOHM	0
54061013400 Sumida Corporation	FIXED IND 100NH 180MA 890 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