Fixed Inductors

Part Number	Description / PDF	Quantity
CDRR105NP-680MC Sumida Corporation	FIXED IND 68UH 1.38A 195 MOHM	0
CDRH70D45BT150NP-1R2NC Sumida Corporation	FIXED IND 1.2UH 8.7A 8 MOHM SMD	935
CD104NP-561KC Sumida Corporation	FIXED IND 560UH 320MA 1.904 OHM	0
RCH110NP-680K Sumida Corporation	FIXED IND 68UH 2.1A 120 MOHM TH	75
CDEP134NP-4R8MC Sumida Corporation	FIXED IND 4.8UH 7.5A 12 MOHM SMD	1255
CDEP147NP-4R7MC-95 Sumida Corporation	FIXED IND 4.7UH 12.5A 6.03 MOHM	582
CR32NP-181KC Sumida Corporation	FIXED IND 180UH 165MA 3.9 OHM	0
CR32NP-7R4MC Sumida Corporation	FIXED IND 7.4UH 840MA 215 MOHM	0
CR75NP-820KC Sumida Corporation	FIXED IND 82UH 780MA 370 MOHM	0
CDRH62BNP-100MC-B Sumida Corporation	FIXED IND 10UH 1.1A 150 MOHM SMD	40117
CDRH125/LDNP-560MC Sumida Corporation	FIXED IND 56UH 2A 125 MOHM SMD	0
CR32NP-1R2MC Sumida Corporation	FIXED IND 1.2UH 1.7A 78 MOHM SMD	0
CD73NP-680KC Sumida Corporation	FIXED IND 68UH 590MA 332 MOHM	0
CD104NP-271KC Sumida Corporation	FIXED IND 270UH 450MA 949 MOHM	0
CDRH2D11/HPNP-1R5NC Sumida Corporation	FIXED IND 1.5UH 1.6A 80 MOHM SMD	0
CD54NP-820KC Sumida Corporation	FIXED IND 82UH 580MA 600 MOHM	0
CDRH125NP-151MC Sumida Corporation	FIXED IND 150UH 1A 230 MOHM SMD	2893
CDRH4D16NP-4R7NC Sumida Corporation	FIXED IND 4.7UH 1.65A 75 MOHM	1000
CDRH127NP-151MC Sumida Corporation	FIXED IND 150UH 1.42A 280 MOHM	2417
CDRH6D38NP-220NC Sumida Corporation	FIXED IND 22UH 1.3A 96 MOHM SMD	252

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