Fixed Inductors

Part Number	Description / PDF	Quantity
3-2176086-7 TE Connectivity AMP Connectors	FIXED IND 33NH 490MA 330 MOHM	0
36541E4N3JTDG TE Connectivity AMP Connectors	FIXED IND 4.3NH 1.6A 45 MOHM	0
3622A4R7MT TE Connectivity AMP Connectors	FIXED IND 4.7UH 1.5A 90 MOHM SMD	0
36502A3N0JTDG TE Connectivity AMP Connectors	FIXED IND 3NH 800MA 60 MOHM SMD	3785
36502AR36JTDG TE Connectivity AMP Connectors	FIXED IND 360NH 300MA 1.45 OHM	2434
4-2176086-3 TE Connectivity AMP Connectors	FIXED IND 47NH 420MA 580 MOHM	0
SC10221KT TE Connectivity AMP Connectors	FIXED IND 220UH 117MA 17 OHM TH	0
3615A102K TE Connectivity AMP Connectors	FIXED IND 1MH 118MA 16.5 OHM SMD	0
SC10470KT TE Connectivity AMP Connectors	FIXED IND 47UH 156MA 9.6 OHM TH	0
3-2176086-4 TE Connectivity AMP Connectors	FIXED IND 26NH 450MA 275 MOHM	0
3638C471MT TE Connectivity AMP Connectors	FIXED IND 470UH 320MA 1.1 OHM	0
3631F101MT TE Connectivity AMP Connectors	FIXED IND 100UH 2.1A 150 MOHM	0
2-2176086-9 TE Connectivity AMP Connectors	FIXED IND 21NH 450MA 460 MOHM	0
36502AR18JTDG TE Connectivity AMP Connectors	FIXED IND 180NH 400MA 640 MOHM	3925
3631A101KT TE Connectivity AMP Connectors	FIXED IND 100UH 1A 400 MOHM SMD	0
36502A72NJTDG TE Connectivity AMP Connectors	FIXED IND 72NH 500MA 400 MOHM	0
36501J4N3JTDG TE Connectivity AMP Connectors	FIXED IND 4.3NH 700MA 63 MOHM	4000
3-2176086-2 TE Connectivity AMP Connectors	FIXED IND 24NH 700MA 190 MOHM	0
3632B332LT TE Connectivity AMP Connectors	FIXED IND 3.3MH 150MA 8 OHM SMD	0
4-2176086-0 TE Connectivity AMP Connectors	FIXED IND 39NH 450MA 430 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