Fixed Inductors

Part Number	Description / PDF	Quantity
104CDMCCDS-470MC Sumida Corporation	FIXED IND 47UH 3.2A 145 MOHM	9950
CDRH125/LDNP-330MC Sumida Corporation	FIXED IND 33UH 2.6A 65 MOHM SMD	337
RCH664NP-220K Sumida Corporation	FIXED IND 22UH 1.27A 110 MOHM TH	0
CLS5D11HPNP-150NC Sumida Corporation	FIXED IND 15UH 600MA 390 MOHM	0
CD73NP-221KC Sumida Corporation	FIXED IND 220UH 310MA 1.2 OHM	0
CDRH62BNP-680MC-B Sumida Corporation	FIXED IND 68UH 420MA 1.07 OHM	0
CDEP105NP-0R8MC-88 Sumida Corporation	FIXED IND 800NH 17.7A 2.4 MOHM	0
CMD5D13NP-4R7MC Sumida Corporation	FIXED IND 4.7UH 1.2A 106 MOHM	481
CDRH8D38/ANP-220MC Sumida Corporation	FIXED IND 22UH 1.24A 100 MOHM	0
CDRH73NP-821MC-B Sumida Corporation	FIXED IND 820UH 180MA 6.54 OHM	0
RCH875NP-221K Sumida Corporation	FIXED IND 220UH 380MA 630 MOHM	200
CDR7D43MNNP-180NC Sumida Corporation	FIXED IND 18UH 1.6A 93.6 MOHM	0
CDRR75NP-100MC Sumida Corporation	FIXED IND 10UH 2.4A 57 MOHM SMD	0
CR75NP-100KC Sumida Corporation	FIXED IND 10UH 2.3A 70 MOHM SMD	126
CDRH127L125NP-7R5NC Sumida Corporation	FIXED IND 7.5UH 7A 16.3MOHM SMD	0
CDRH125/LDNP-271MC Sumida Corporation	FIXED IND 270UH 940MA 520 MOHM	0
0512CDMCCDS-3R3MC Sumida Corporation	FIXED IND 3.3UH 2.9A 107.4MOHM	4000
CDRH125NP-180MC Sumida Corporation	FIXED IND 18UH 3A 34 MOHM SMD	463
54062213400 Sumida Corporation	FIXED IND 220NH 120MA 1.9 OHM	0
CDRH125L125NP-100MC Sumida Corporation	FIXED IND 10UH 5.3A 25 MOHM SMD	48

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