Fixed Inductors

Part Number	Description / PDF	Quantity
CDRH5D28NP-3R0NC Sumida Corporation	FIXED IND 3UH 2.4A 24 MOHM SMD	14059
CDRH8D28NP-100NC Sumida Corporation	FIXED IND 10UH 3.2A 47 MOHM SMD	261
5508 471 34 00 Sumida Corporation	FIXED IND 470NH 115MA 2.4 OHM	0
CR75NP-390KC Sumida Corporation	FIXED IND 39UH 1.1A 160 MOHM SMD	0
CDRH4D22HPNP-4R7NC Sumida Corporation	FIXED IND 4.7UH 1.8A 82.6 MOHM	0
0830CDMCCDS-2R2MC Sumida Corporation	FIXED IND 2.2UH 10A 13 MOHM SMD	10788
CDRR105NP-221MC Sumida Corporation	FIXED IND 220UH 760MA 573 MOHM	0
0410CDMCCDS-1R0MC Sumida Corporation	FIXED IND 1UH 3.7A 56MOHM SMD	5850
CR54NP-150MC Sumida Corporation	FIXED IND 15UH 1.3A 140 MOHM SMD	570
CDR125NP-391MC Sumida Corporation	FIXED IND 390UH 520MA 1.08 OHM	0
CDH115NP-391KC Sumida Corporation	FIXED IND 390UH 480MA 1.1 OHM	0
CR54NP-180MC Sumida Corporation	FIXED IND 18UH 1.23A 150 MOHM	0
CDPH4D19FNP-8R0MC Sumida Corporation	FIXED IND 8UH 2.68A 56 MOHM SMD	0
CDRH4D28CNP-1R1PC Sumida Corporation	FIXED IND 1.1UH 3.8A 22 MOHM SMD	0
CD75NP-180KC Sumida Corporation	FIXED IND 18UH 1.6A 100 MOHM SMD	0
CDRH8D43NP-680NC Sumida Corporation	FIXED IND 68UH 1A 240 MOHM SMD	0
CR32NP-5R6MC Sumida Corporation	FIXED IND 5.6UH 1A 176 MOHM SMD	0
CDH115NP-220LC Sumida Corporation	FIXED IND 22UH 2.1A 60 MOHM SMD	0
CDR105NP-560MC Sumida Corporation	FIXED IND 56UH 1.07A 190 MOHM	0
CDRH70D45BT150NP-101MC Sumida Corporation	FIXED IND 100UH 1.23A 300 MOHM	1980

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