Fixed Inductors

Part Number	Description / PDF	Quantity
3615A821K TE Connectivity AMP Connectors	FIXED IND 820UH 123MA 15.1 OHM	0
36502C3R3JTDG TE Connectivity AMP Connectors	FIXED IND 3.3UH 290MA 3.4 OHM	0
36501E43NJTDG TE Connectivity AMP Connectors	FIXED IND 43NH 100MA 810 MOHM	0
MSC60103KT TE Connectivity AMP Connectors	FIXED IND 10MH 24MA 137 OHM TH	0
4-2176086-4 TE Connectivity AMP Connectors	FIXED IND 51NH 360MA 700 MOHM	0
MGPWL-00057-P TE Connectivity AMP Connectors	FIXED IND 220UH 230 MOHM TH	0
3615A220K TE Connectivity AMP Connectors	FIXED IND 22UH 340MA 2 OHM SMD	0
36502C5N6JTDG TE Connectivity AMP Connectors	FIXED IND 5.6NH 1A 150 MOHM SMD	1838
36501E9N0JTDG TE Connectivity AMP Connectors	FIXED IND 9NH 680MA 104 MOHM	0
3631B471KT TE Connectivity AMP Connectors	FIXED IND 470UH 500MA 970 MOHM	0
36501J7N5JTDG TE Connectivity AMP Connectors	FIXED IND 7.5NH 700MA 110 MOHM	4000
36502C75NJTDG TE Connectivity AMP Connectors	FIXED IND 75NH 1A 210 MOHM SMD	3967
36502C39NJTDG TE Connectivity AMP Connectors	FIXED IND 39NH 1A 150 MOHM SMD	3945
36541E5N1JTDG TE Connectivity AMP Connectors	FIXED IND 5.1NH 1.2A 100 MOHM	0
36502CR56JTDG TE Connectivity AMP Connectors	FIXED IND 560NH 400MA 1.33 OHM	3855
3630F330MT TE Connectivity AMP Connectors	FIXED IND 33UH 2.5A 100 MOHM SMD	0
36502AR30JTDG TE Connectivity AMP Connectors	FIXED IND 300NH 330MA 1.2 OHM	0
3630C332KT TE Connectivity AMP Connectors	FIXED IND 3.3UH 0.1MA 10 OHM SMD	0
36502CR36JTDG TE Connectivity AMP Connectors	FIXED IND 360NH 470MA 1.12 OHM	0
2-2176086-0 TE Connectivity AMP Connectors	FIXED IND 10NH 1.3A 85 MOHM SMD	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