Fixed Inductors

Part Number	Description / PDF	Quantity
SC30102KT TE Connectivity AMP Connectors	FIXED IND 1MH 49MA 72 OHM TH	0
3613C471K TE Connectivity AMP Connectors	FIXED IND 470UH 62MA 26 OHM SMD	0
36501JR11JTDG TE Connectivity AMP Connectors	FIXED IND 110NH 300MA 610 MOHM	281
36401E2N9ATDF TE Connectivity AMP Connectors	FIXED IND 2.9NH 380MA 450 MOHM	2000
2-2176075-2 TE Connectivity AMP Connectors	FIXED IND 2.2NH 200MA 700 MOHM	0
3632B222LT TE Connectivity AMP Connectors	FIXED IND 2.2MH 200MA 5 OHM SMD	0
36501JR12JTDG TE Connectivity AMP Connectors	FIXED IND 120NH 300MA 650 MOHM	3145
SC30820KT TE Connectivity AMP Connectors	FIXED IND 82UH 156MA 7.3 OHM TH	0
36502C68NJTDG TE Connectivity AMP Connectors	FIXED IND 68NH 1A 200 MOHM SMD	129
36502AR68JTDG TE Connectivity AMP Connectors	FIXED IND 680NH 190MA 2.2 OHM	1170
36502CR30JTDG TE Connectivity AMP Connectors	FIXED IND 300NH 450MA 1 OHM SMD	3962
36401E18NGTDF TE Connectivity AMP Connectors	FIXED IND 18NH 100MA 2.15 OHM	760
3613C331K TE Connectivity AMP Connectors	FIXED IND 330UH 85MA 14 OHM SMD	0
36502AR22JTDG TE Connectivity AMP Connectors	FIXED IND 220NH 400MA 700 MOHM	0
3-2176075-6 TE Connectivity AMP Connectors	FIXED IND 3.6NH 150MA 1.2 OHM	0
36501J10NJTDG TE Connectivity AMP Connectors	FIXED IND 10NH 700MA 130 MOHM	1887
1-2176075-0 TE Connectivity AMP Connectors	FIXED IND 1NH 300MA 300 MOHM SMD	0
36501J5N1JTDG TE Connectivity AMP Connectors	FIXED IND 5.1NH 700MA 160 MOHM	3022
36501E13NJTDG TE Connectivity AMP Connectors	FIXED IND 13NH 440MA 210 MOHM	1084
36502A1R0JTDG TE Connectivity AMP Connectors	FIXED IND 1UH 170MA 2.5 OHM SMD	4639

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