Fixed Inductors

Part Number	Description / PDF	Quantity
CDRR75NP-150MC Sumida Corporation	FIXED IND 15UH 2.07A 63 MOHM SMD	0
CDH53NP-470KC Sumida Corporation	FIXED IND 47UH 530MA 770 MOHM	0
CDR125NP-561MC Sumida Corporation	FIXED IND 560UH 440MA 1.34 OHM	0
RCP1317NP-152L Sumida Corporation	FIXED IND 1.5MH 720MA 1.4 OHM TH	0
RCP1317NP-221L Sumida Corporation	FIXED IND 220UH 1.6A 278 MOHM TH	0
CR32NP-221KC Sumida Corporation	FIXED IND 220UH 155MA 4.5 OHM	0
CR32NP-180KC Sumida Corporation	FIXED IND 18UH 525MA 410 MOHM	0
0410CDMCCDS-1R2MC Sumida Corporation	FIXED IND 1.2UH 3.5A 66MOHM SMD	0
CDRH2D18/HPNP-R20NC Sumida Corporation	FIXED IND 200NH 4.7A 22 MOHM SMD	0
CDRH124NP-220MC Sumida Corporation	FIXED IND 22UH 2.9A 66 MOHM SMD	0
RCP1317NP-561L Sumida Corporation	FIXED IND 560UH 1.1A 590 MOHM TH	0
CDRH105RNP-101NC Sumida Corporation	FIXED IND 100UH 1.35A 253 MOHM	995
0830CDMCCDS-3R3MC Sumida Corporation	FIXED IND 3.3UH 9.5A 19 MOHM SMD	1740
125CDMCCDS-330MC Sumida Corporation	FIXED IND 33UH 6A 57MOHM SMD	1246
CDR105NP-101MC Sumida Corporation	FIXED IND 100UH 800MA 350 MOHM	0
CDRH10D48/ANP-7R2MC Sumida Corporation	FIXED IND 7.2UH 2.9A 29 MOHM SMD	80
CDRH8D28NP-2R5NC Sumida Corporation	FIXED IND 2.5UH 6.4A 15.6 MOHM	0
RCH895NP-822K Sumida Corporation	FIXED IND 8.2MH 75MA 15.3 OHM TH	0
CR54NP-5R6MC Sumida Corporation	FIXED IND 5.6UH 2.48A 49.4 MOHM	270
CDRH64BNP-330MC-B Sumida Corporation	FIXED IND 33UH 750MA 330 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