Fixed Inductors

Part Number	Description / PDF	Quantity
CDRH124NP-330MC Sumida Corporation	FIXED IND 33UH 2.7A 97 MOHM SMD	488
CDRH103RNP-0R8NC-B Sumida Corporation	FIXED IND 800NH 8.3A 5.7 MOHM	0
CDR7D43MNNP-820NC Sumida Corporation	FIXED IND 82UH 650MA 401.4 MOHM	0
CDRH124NP-120MC Sumida Corporation	FIXED IND 12UH 4A 38 MOHM SMD	0
CDRH5D28RHPNP-8R2NC Sumida Corporation	FIXED IND 8.2UH 1.9A 88.4 MOHM	0
CDRH6D28NP-680NC Sumida Corporation	FIXED IND 68UH 650MA 304 MOHM	1398
CDEP147NP-3R4MC-95 Sumida Corporation	FIXED IND 3.4UH 16A 4.97 MOHM	0
CDRH5D16F/LDNP-2R2NC Sumida Corporation	FIXED IND 2.2UH 3.8A 27 MOHM SMD	114
CDR105NP-680MC Sumida Corporation	FIXED IND 68UH 970MA 220 MOHM	0
CDRR75NP-330MC Sumida Corporation	FIXED IND 33UH 1.39A 119 MOHM	0
CDRH127/LDNP-471MC Sumida Corporation	FIXED IND 470UH 1A 741 MOHM SMD	0
RCH110NP-331K Sumida Corporation	FIXED IND 330UH 930MA 520 MOHM	102
CDRH4D22NP-2R3NC Sumida Corporation	FIXED IND 2.3UH 3.6A 25.4 MOHM	0
CDRH4D22NP-120NC Sumida Corporation	FIXED IND 12UH 1.8A 110.4 MOHM	0
CDRH3D16/HPNP-100MC Sumida Corporation	FIXED IND 10UH 1A 230 MOHM SMD	84
CDRH127/LDNP-331MC Sumida Corporation	FIXED IND 330UH 1.2A 471 MOHM	146
CDR63BNP-330LC Sumida Corporation	FIXED IND 33UH 610MA 410 MOHM	0
0640CDMCCDS-2R2MC Sumida Corporation	FIXED IND 2.2UH 12A 10.8MOHM SMD	9800
CDRH4D22NP-470NC Sumida Corporation	FIXED IND 47UH 820MA 500.4 MOHM	0
CR54NP-330LC Sumida Corporation	FIXED IND 33UH 880MA 230 MOHM	1231

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