Fixed Inductors

Part Number	Description / PDF	Quantity
3-2176075-3 TE Connectivity AMP Connectors	FIXED IND 3.3NH 150MA 1 OHM SMD	0
SC30R22KT TE Connectivity AMP Connectors	FIXED IND 220NH 1.12A 140 MOHM	939
36401E22NJ TE Connectivity AMP Connectors	FIXED IND 22NH 90MA 2.65 OHM SMD	0
36502CR33JTDG TE Connectivity AMP Connectors	FIXED IND 330NH 450MA 1.05 OHM	0
36501E16NJTDG TE Connectivity AMP Connectors	FIXED IND 16NH 560MA 220 MOHM	459
36501JR33JTDG TE Connectivity AMP Connectors	FIXED IND 330NH 100MA 3.8 OHM	579
36401E1N2ATDF TE Connectivity AMP Connectors	FIXED IND 1.2NH 700MA 150 MOHM	1000
36401E8N2A TE Connectivity AMP Connectors	FIXED IND 8.2NH 220MA 1.25 OHM	0
36401E12NGTDF TE Connectivity AMP Connectors	FIXED IND 12NH 180MA 1.55 OHM	2000
3631C180MT TE Connectivity AMP Connectors	FIXED IND 18UH 3.9A 40 MOHM SMD	0
36401E15NG TE Connectivity AMP Connectors	FIXED IND 15NH 130MA 1.75 OHM	0
36501E8N7JTDG TE Connectivity AMP Connectors	FIXED IND 8.7NH 480MA 200 MOHM	832
36501J3N9JTDG TE Connectivity AMP Connectors	FIXED IND 3.9NH 700MA 80 MOHM	2140
36401E9N1ATDF TE Connectivity AMP Connectors	FIXED IND 9.1NH 220MA 1.25 OHM	2000
3631B221LL TE Connectivity AMP Connectors	FIXED IND 220UH 700MA 460 MOHM	0
36401E15NGTDF TE Connectivity AMP Connectors	FIXED IND 15NH 130MA 1.75 OHM	1690
36401E0N2ATDF TE Connectivity AMP Connectors	FIXED IND 0.2NH 800MA 100 MOHM	1450
3613CR47M TE Connectivity AMP Connectors	FIXED IND 470NH 545MA 320 MOHM	469
36401E3N0ATDF TE Connectivity AMP Connectors	FIXED IND 3NH 380MA 450 MOHM	0
2-2176075-0 TE Connectivity AMP Connectors	FIXED IND 2NH 200MA 700 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