Fixed Inductors

Part Number	Description / PDF	Quantity
36401E1N5A TE Connectivity AMP Connectors	FIXED IND 1.5NH 700MA 250 MOHM	0
36401E1N5ATD TE Connectivity AMP Connectors	FIXED IND 1.5NH 700MA 250 MOHM	0
36501E18NJTDG TE Connectivity AMP Connectors	FIXED IND 18NH 420MA 230 MOHM	565
36501E2N0JTDG TE Connectivity AMP Connectors	FIXED IND 2NH 1.04A 70 MOHM SMD	2138
36502AR47JTDG TE Connectivity AMP Connectors	FIXED IND 470NH 220MA 1.7 OHM	0
3-2176075-7 TE Connectivity AMP Connectors	FIXED IND 3.7NH 150MA 1.2 OHM	962
36501E2N7JTDG TE Connectivity AMP Connectors	FIXED IND 2.7NH 640MA 120 MOHM	3489
36501E15NJTDG TE Connectivity AMP Connectors	FIXED IND 15NH 560MA 172 MOHM	46
36401E1N5ATDF TE Connectivity AMP Connectors	FIXED IND 1.5NH 700MA 250 MOHM	0
36502A56NJTDG TE Connectivity AMP Connectors	FIXED IND 56NH 500MA 340 MOHM	842
36401E3N4ATDF TE Connectivity AMP Connectors	FIXED IND 3.4NH 380MA 550 MOHM	0
4-2176075-2 TE Connectivity AMP Connectors	FIXED IND 4.7NH 130MA 1.4 OHM	725
3613CR22M TE Connectivity AMP Connectors	FIXED IND 220NH 665MA 250 MOHM	1419
3613C4R7K TE Connectivity AMP Connectors	FIXED IND 4.7UH 315MA 1 OHM SMD	95
1-2176075-8 TE Connectivity AMP Connectors	FIXED IND 1.8NH 200MA 550 MOHM	0
4-2176075-3 TE Connectivity AMP Connectors	FIXED IND 4.9NH SMD	1000
36502AR56JTDG TE Connectivity AMP Connectors	FIXED IND 560NH 210MA 1.9 OHM	0
36502A18NJTDG TE Connectivity AMP Connectors	FIXED IND 18NH 600MA 200 MOHM	2000
3631B331KL TE Connectivity AMP Connectors	FIXED IND 330UH 600MA 660 MOHM	2196
36502AR39JTDG TE Connectivity AMP Connectors	FIXED IND 390NH 290MA 1.5 OHM	1832

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