Fixed Inductors

Part Number	Description / PDF	Quantity
3-2176075-2 TE Connectivity AMP Connectors	FIXED IND 3.2NH 150MA 1 OHM SMD	0
36401E2N2A TE Connectivity AMP Connectors	FIXED IND 2.2NH 440MA 350 MOHM	0
36502C4R7JTDG TE Connectivity AMP Connectors	FIXED IND 4.7UH 260MA 4 OHM SMD	3937
2176075-4 TE Connectivity AMP Connectors	FIXED IND 0.4NH 350MA 250 MOHM	0
SC301R0KT TE Connectivity AMP Connectors	FIXED IND 1UH 420MA 1 OHM TH	0
36401E8N0ATDF TE Connectivity AMP Connectors	FIXED IND 8NH 220MA 1.25 OHM SMD	0
3631B471KL TE Connectivity AMP Connectors	FIXED IND 470UH 500MA 970 MOHM	2225
36501E12NJTDG TE Connectivity AMP Connectors	FIXED IND 12NH 640MA 120 MOHM	2560
SC30R33KT TE Connectivity AMP Connectors	FIXED IND 330NH 900MA 220 MOHM	0
36501E7N5JTDG TE Connectivity AMP Connectors	FIXED IND 7.5NH 680MA 104 MOHM	2381
36502AR25JTDG TE Connectivity AMP Connectors	FIXED IND 250NH 350MA 1 OHM SMD	5463
1-2176075-7 TE Connectivity AMP Connectors	FIXED IND 1.7NH 200MA 550 MOHM	0
SC30R47KT TE Connectivity AMP Connectors	FIXED IND 470NH 710MA 350 MOHM	24
36401E3N5ATDF TE Connectivity AMP Connectors	FIXED IND 3.5NH 380MA 550 MOHM	0
36501J4N7JTDG TE Connectivity AMP Connectors	FIXED IND 4.7NH 700MA 120 MOHM	1074
36401E3N7ATDF TE Connectivity AMP Connectors	FIXED IND 3.7NH 340MA 550 MOHM	0
3631B100ML TE Connectivity AMP Connectors	FIXED IND 10UH 3.3A 35 MOHM SMD	261
3631B220ML TE Connectivity AMP Connectors	FIXED IND 22UH 2.3A 62 MOHM SMD	1169
SC30R10KT TE Connectivity AMP Connectors	FIXED IND 100NH 1.49A 80 MOHM TH	0
2-2176075-7 TE Connectivity AMP Connectors	FIXED IND 2.7NH 150MA 800 MOHM	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