Fixed Inductors

Part Number	Description / PDF	Quantity
54062713400 Sumida Corporation	FIXED IND 270NH 115MA 2.1 OHM	0
CDRH127NP-180MC Sumida Corporation	FIXED IND 18UH 3.9A 39.2 MOHM	389
CDEP134NP-2R7MC-H Sumida Corporation	FIXED IND 2.7UH 8A 10.8 MOHM SMD	0
CDRH104RNP-220NC Sumida Corporation	FIXED IND 22UH 2.5A 73 MOHM SMD	13108
CDH53NP-100LC Sumida Corporation	FIXED IND 10UH 1.23A 160 MOHM	0
CDRH62BNP-6R3NC-B Sumida Corporation	FIXED IND 6.3UH 1.3A 100 MOHM	0
CDRH4D28CLDNP-4R7PC Sumida Corporation	FIXED IND 4.7UH 2.9A 36.3 MOHM	0
CDRH2D09NP-4R7MC Sumida Corporation	FIXED IND 4.7UH 640MA 220 MOHM	0
177CDMCCDS-4R7MC Sumida Corporation	FIXED IND 4.7UH 18A 4.83MOHM SMD	1484
0420CDMCCDS-1R0MC Sumida Corporation	FIXED IND 1UH 6.5A 27 MOHM SMD	15207
CDRH60D45BT150NP-101MC Sumida Corporation	FIXED IND 100UH 860MA 340 MOHM	0
CDRH8D43NP-2R0NC Sumida Corporation	FIXED IND 2UH 5.5A 14 MOHM SMD	90
CDRH8D28HPNP-4R7NC Sumida Corporation	FIXED IND 4.7UH 3.6A 40 MOHM SMD	995
CDRH12D58/ANP-100MC Sumida Corporation	FIXED IND 10UH 3.8A 22 MOHM SMD	0
CDRH104RT125NP-220MC Sumida Corporation	FIXED IND 22UH 2.3A 70 MOHM SMD	48
CEP125NP-1R0MC-H Sumida Corporation	FIXED IND 1UH 16.5A 2.5 MOHM SMD	158
CDR125NP-471MC Sumida Corporation	FIXED IND 470UH 480MA 1.2 OHM	0
CDRH74NP-820MC-B Sumida Corporation	FIXED IND 82UH 610MA 430 MOHM	0
CDRH70D45BT150NP-100MC Sumida Corporation	FIXED IND 10UH 3.8A 33 MOHM SMD	887
0315CDMCCDS-R56MC Sumida Corporation	FIXED IND 560NH 5.5A 25MOHM SMD	3000

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