Fixed Inductors

Part Number	Description / PDF	Quantity
CDRH3D16NP-4R7NC Sumida Corporation	FIXED IND 4.7UH 900MA 105 MOHM	2620
CDRH103RNP-121NC-B Sumida Corporation	FIXED IND 120UH 650MA 754 MOHM	0
CR32NP-470KC Sumida Corporation	FIXED IND 47UH 330MA 970 MOHM	0
CDRH2D14NP-1R8NC Sumida Corporation	FIXED IND 1.8UH 1.8A 75 MOHM SMD	0
CDRH5D28RNP-3R3NC Sumida Corporation	FIXED IND 3.3UH 2.3A 20.3 MOHM	2419
CDRH127NP-150MC Sumida Corporation	FIXED IND 15UH 4.5A 27 MOHM SMD	724
CDEP147NP-7R7MC-95 Sumida Corporation	FIXED IND 7.7UH 10A 9.85 MOHM	0
0410CDMCCDS-R47MC Sumida Corporation	FIXED IND 470NH 5A 30.5MOHM SMD	3112
54063913400 Sumida Corporation	FIXED IND 390NH 80MA 4 OHM SMD	0
CDRH8D43HPNP-2R7NC Sumida Corporation	FIXED IND 2.7UH 5.1A 19.5 MOHM	466
CDRH8D38NP-330NC Sumida Corporation	FIXED IND 33UH 1.6A 157 MOHM SMD	2907
CDRH8D43HPNP-330NC Sumida Corporation	FIXED IND 33UH 1.4A 150 MOHM SMD	964
CDRH4D28NP-2R2NC Sumida Corporation	FIXED IND 2.2UH 2.04A 31.3 MOHM	7313
CDRH104RNP-180NC Sumida Corporation	FIXED IND 18UH 1.8A 84 MOHM SMD	0
CDRH2D18/HPNP-1R7NC Sumida Corporation	FIXED IND 1.7UH 2.2A 44 MOHM SMD	348
0830CDMCCDS-4R7MC Sumida Corporation	FIXED IND 4.7UH 6.5A 31 MOHM SMD	379
CEP125NP-7R2MC-H Sumida Corporation	FIXED IND 7.2UH 7.6A 13.5 MOHM	0
CDH53NP-150KC Sumida Corporation	FIXED IND 15UH 1A 250 MOHM SMD	0
CDRH8D43HPNP-6R8NC Sumida Corporation	FIXED IND 6.8UH 3.3A 36 MOHM SMD	0
CR43NP-5R6MC Sumida Corporation	FIXED IND 5.6UH 990MA 125.7 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