Fixed Inductors

Part Number	Description / PDF	Quantity
CDRH5D16NP-2R2NC Sumida Corporation	FIXED IND 2.2UH 2.9A 35.9 MOHM	0
CDRH73NP-330MC-B Sumida Corporation	FIXED IND 33UH 910MA 240 MOHM	0
55084703400 Sumida Corporation	FIXED IND 47NH 500MA 130 MOHM	0
CDR6D23MNNP-120NC Sumida Corporation	FIXED IND 12UH 1.25A 117.5 MOHM	0
0420CDMCCDS-R56MC Sumida Corporation	FIXED IND 560NH 8.1A 16 MOHM	2189
104CDMCCDS-8R2MC Sumida Corporation	FIXED IND 8.2UH 8.3A 27 MOHM	736
CDR7D28MNNP-220NC Sumida Corporation	FIXED IND 22UH 1.6A 120 MOHM SMD	0
CD30D22HF-6R8MC Sumida Corporation	FIXED IND 6.8UH 1.28A 172 MOHM	0
CDR125NP-390MC Sumida Corporation	FIXED IND 39UH 1.65A 110 MOHM	0
CDRH4D28NP-680NC Sumida Corporation	FIXED IND 68UH 350MA 699 MOHM	0
CDRH125/LDNP-151MC Sumida Corporation	FIXED IND 150UH 1.26A 280 MOHM	44
CDEIR8D38FNP-220NC Sumida Corporation	FIXED IND 22UH 2.2A 88.3 MOHM	0
CDRH8D28NP-1R0NC Sumida Corporation	FIXED IND 1UH 7A 11 MOHM SMD	0
0420CDMCCDS-3R3MC Sumida Corporation	FIXED IND 3.3UH 3.5A 87 MOHM	1139
CDR7D28MNNP-3R6NC Sumida Corporation	FIXED IND 3.6UH 3.45A 32.5 MOHM	476
CDRR75NP-681MC Sumida Corporation	FIXED IND 680UH 310MA 1.866 OHM	0
CDH74NP-220LC Sumida Corporation	FIXED IND 22UH 1.7A 130 MOHM SMD	0
CDRH103RNP-4R7NC-B Sumida Corporation	FIXED IND 4.7UH 4A 30 MOHM SMD	0
CDRH4D28NP-5R6NC Sumida Corporation	FIXED IND 5.6UH 1.17A 100.9 MOHM	0
CDRH5D28RHPNP-4R7NC Sumida Corporation	FIXED IND 4.7UH 2.8A 43.1 MOHM	32892

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