Fixed Inductors

Part Number	Description / PDF	Quantity
3632A682LT TE Connectivity AMP Connectors	FIXED IND 6.8MH 90MA 24 OHM SMD	0
SC15820KT TE Connectivity AMP Connectors	FIXED IND 82UH 200MA 3.9 OHM TH	0
3615A4R7K TE Connectivity AMP Connectors	FIXED IND 4.7UH 1.05A 210 MOHM	0
3615A221K TE Connectivity AMP Connectors	FIXED IND 220UH 175MA 7.5 OHM	0
MGDH1-00011-P TE Connectivity AMP Connectors	FIXED INDUCTOR	0
3625B331KT TE Connectivity AMP Connectors	FIXED IND 330UH 620MA 950 MOHM	0
36501E1N0J TE Connectivity AMP Connectors	FIXED IND 1NH 1.36A 45 MOHM SMD	0
36502CR91JTDG TE Connectivity AMP Connectors	FIXED IND 910NH 380MA 1.68 OHM	0
3-2176086-9 TE Connectivity AMP Connectors	FIXED IND 37NH 470MA 480 MOHM	0
SC30101KR TE Connectivity AMP Connectors	FIXED IND 100UH 149MA 8 OHM TH	0
9-1624112-5 TE Connectivity AMP Connectors	FIXED IND 270NH 200MA 2.1 OHM	0
36502AR75JTDG TE Connectivity AMP Connectors	FIXED IND 750NH 180MA 2.3 OHM	3543
SC15470KT TE Connectivity AMP Connectors	FIXED IND 47UH 235MA 2.75 OHM TH	0
SC10150KT TE Connectivity AMP Connectors	FIXED IND 15UH 395MA 1.5 OHM TH	0
2-2176086-4 TE Connectivity AMP Connectors	FIXED IND 15NH 1.1A 110 MOHM SMD	0
3-2176086-6 TE Connectivity AMP Connectors	FIXED IND 30NH 450MA 330 MOHM	0
36541E5N6JTDG TE Connectivity AMP Connectors	FIXED IND 5.6NH 1.6A 48 MOHM	0
36502AR24JTDG TE Connectivity AMP Connectors	FIXED IND 240NH 350MA 1 OHM SMD	0
36541E6N8JTDG TE Connectivity AMP Connectors	FIXED IND 6.8NH 1.5A 55 MOHM	0
36501J43NJTDG TE Connectivity AMP Connectors	FIXED IND 43NH 600MA 280 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