Fixed Inductors

Part Number	Description / PDF	Quantity
1-2176075-2 TE Connectivity AMP Connectors	FIXED IND 1.2NH 300MA 350 MOHM	1000
2-2176075-9 TE Connectivity AMP Connectors	FIXED IND 2.9NH 150MA 1 OHM SMD	868
36501E20NJTDG TE Connectivity AMP Connectors	FIXED IND 20NH 420MA 250 MOHM	18764
SC30331KT TE Connectivity AMP Connectors	FIXED IND 330UH 79MA 28 OHM TH	0
MGDQ5-00017-P TE Connectivity AMP Connectors	FIXED IND 100UH 1.3A 160 MOHM	0
36401E33NGTD TE Connectivity AMP Connectors	FIXED IND 33NH 75MA 4.5 OHM SMD	0
36401E1N8ATDF TE Connectivity AMP Connectors	FIXED IND 1.8NH 560MA 250 MOHM	4000
36502A2R2JTDG TE Connectivity AMP Connectors	FIXED IND 2.2UH 160MA 2.7 OHM	24
SC306R8KT TE Connectivity AMP Connectors	FIXED IND 6.8UH 298MA 2 OHM TH	0
36501JR15JTDG TE Connectivity AMP Connectors	FIXED IND 150NH 280MA 950 MOHM	1685
36501E3N3JTDG TE Connectivity AMP Connectors	FIXED IND 3.3NH 840MA 66 MOHM	1665
36501E3N9JTDG TE Connectivity AMP Connectors	FIXED IND 3.9NH 840MA 66 MOHM	1206
SC153R3KT TE Connectivity AMP Connectors	FIXED IND 3.3UH 340MA 2 OHM TH	0
2-2176086-5 TE Connectivity AMP Connectors	FIXED IND 16NH 850MA 130 MOHM	0
2-2176086-8 TE Connectivity AMP Connectors	FIXED IND 20NH 780MA 185 MOHM	0
36501E5N1JTDG TE Connectivity AMP Connectors	FIXED IND 5.1NH 800MA 83 MOHM	1935
3631C470LT TE Connectivity AMP Connectors	FIXED INDUCTOR 47UH	0
SC09144R7M TE Connectivity AMP Connectors	FIXED IND 4.7UH 3.2A 33 MOHM TH	0
36541E2N0JTDG TE Connectivity AMP Connectors	FIXED IND 2NH 2.1A 38 MOHM SMD	0
36502C56NJTDG TE Connectivity AMP Connectors	FIXED IND 56NH 1A 180 MOHM SMD	4000

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