Fixed Inductors

Part Number	Description / PDF	Quantity
2176075-3 TE Connectivity AMP Connectors	FIXED IND 0.3NH 400MA 200 MOHM	0
3631B331KT TE Connectivity AMP Connectors	FIXED IND 330UH 600MA 660 MOHM	0
36502CR47JTDG TE Connectivity AMP Connectors	FIXED IND 470NH 470MA 1.19 OHM	2368
36401E2N5ATDF TE Connectivity AMP Connectors	FIXED IND 2.5NH 440MA 350 MOHM	2000
36501J8N7JTDG TE Connectivity AMP Connectors	FIXED IND 8.7NH 700MA 110 MOHM	11
3613C100K TE Connectivity AMP Connectors	FIXED IND 10UH 250MA 1.6 OHM SMD	205
SC30681KT TE Connectivity AMP Connectors	FIXED IND 680UH 54MA 60 OHM TH	0
36502C10NJTDG TE Connectivity AMP Connectors	FIXED IND 10NH 1A 80 MOHM SMD	140
36502A33NJTDG TE Connectivity AMP Connectors	FIXED IND 33NH 500MA 270 MOHM	1882
3-2176075-5 TE Connectivity AMP Connectors	FIXED IND 3.5NH 150MA 1.2 OHM	0
SC30560KT TE Connectivity AMP Connectors	FIXED IND 56UH 176MA 5.7 OHM TH	0
36502A12NJTDG TE Connectivity AMP Connectors	FIXED IND 12NH 600MA 150 MOHM	310
36501JR18JTDG TE Connectivity AMP Connectors	FIXED IND 180NH 250MA 1.4 OHM	230
36502C103JTDG TE Connectivity AMP Connectors	FIXED IND 10UH 150MA 9 OHM SMD	5636
36502A2R7JTDG TE Connectivity AMP Connectors	FIXED IND 2.7UH 150MA 2.95 OHM	4268
36401E15NFTDF TE Connectivity AMP Connectors	FIXED IND 15NH 130MA 1.75 OHM	0
4-2176075-0 TE Connectivity AMP Connectors	FIXED IND 4NH SMD	1000
36502A82NGTDG TE Connectivity AMP Connectors	FIXED IND 82NH 400MA 420 MOHM	0
3613C3R3K TE Connectivity AMP Connectors	FIXED IND 3.3UH 355MA 800 MOHM	120
36401E0N8ATDF TE Connectivity AMP Connectors	FIXED IND 0.8NH 700MA 150 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