Fixed Inductors

Part Number	Description / PDF	Quantity
36401E2N4ATDF TE Connectivity AMP Connectors	FIXED IND 2.4NH 440MA 350 MOHM	0
36401E17NGTDF TE Connectivity AMP Connectors	FIXED IND 17NH 100MA 1.95 OHM	585
36502AR27JTDG TE Connectivity AMP Connectors	FIXED IND 270NH 350MA 1 OHM SMD	1488
3-2176075-8 TE Connectivity AMP Connectors	FIXED IND 3.8NH SMD	0
SC305R6KT TE Connectivity AMP Connectors	FIXED IND 5.6UH 314MA 1.8 OHM TH	0
3-2176075-1 TE Connectivity AMP Connectors	FIXED IND 3.1NH 150MA 1 OHM SMD	0
36501E6N8JTDG TE Connectivity AMP Connectors	FIXED IND 6.8NH 680MA 83 MOHM	4340
36502AR12JTDG TE Connectivity AMP Connectors	FIXED IND 120NH 400MA 510 MOHM	2009
36501J68NJTDG TE Connectivity AMP Connectors	FIXED IND 68NH 600MA 340 MOHM	1688
36502A27NJTDG TE Connectivity AMP Connectors	FIXED IND 27NH 500MA 250 MOHM	1975
SC30180KT TE Connectivity AMP Connectors	FIXED IND 18UH 239MA 3.1 OHM TH	0
36502C1R0GTDG TE Connectivity AMP Connectors	FIXED IND 1UH 370MA 1.75 OHM SMD	0
3631B221KT TE Connectivity AMP Connectors	FIXED IND 220UH 700MA 460 MOHM	0
1-2176075-3 TE Connectivity AMP Connectors	FIXED IND 1.3NH 250MA 450 MOHM	0
36502A8N7JTDG TE Connectivity AMP Connectors	FIXED IND 8.7NH 400MA 210 MOHM	3997
36501J56NJTDG TE Connectivity AMP Connectors	FIXED IND 56NH 600MA 310 MOHM	3920
36501J5N6JTDG TE Connectivity AMP Connectors	FIXED IND 5.6NH 700MA 170 MOHM	1379
36501J039J TE Connectivity AMP Connectors	FIXED IND 39NH 600MA 250 MOHM	1600
36401E2N3ATDF TE Connectivity AMP Connectors	FIXED IND 2.3NH 440MA 350 MOHM	2000
SC303R9KT TE Connectivity AMP Connectors	FIXED IND 3.9UH 420MA 1 OHM TH	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