Fixed Inductors

Part Number	Description / PDF	Quantity
HA65A-25156R8LF TT Electronics	FIXED IND 6.8UH 2.6 MOHM SMD	232
HM73-31100LFTR13 TT Electronics	FIXED IND 10UH 6A 26 MOHM SMD	1058
HM72E-061R0LFTR13 TT Electronics	FIXED IND 1UH 10.3A 10 MOHM SMD	7399
HA65A-251510RLF TT Electronics	FIXED IND 10UH 2.6 MOHM SMD	136
HA65A-251533RLF TT Electronics	FIXED IND 33UH 2.6 MOHM SMD	193
HA65A-25154R7LF TT Electronics	FIXED IND 4.7UH 2.6 MOHM SMD	240
HA65A-25153R3LF TT Electronics	FIXED IND 3.3UH 2.6 MOHM SMD	243
HA65A-251522RLF TT Electronics	FIXED IND 22UH 2.6 MOHM SMD	88
HM66-80151LFTR13 TT Electronics	FIXED IND 150UH 1.15A 506 MOHM	1600
HM66-50680LFTR13 TT Electronics	FIXED IND 68UH 520MA 355 MOHM	3984
HM73-10R47LFTR13 TT Electronics	FIXED IND 470NH 15A 3.16 MOHM	1833
HM66-60120LFTR13 TT Electronics	FIXED IND 12UH 1.55A 70 MOHM SMD	5896
HM66-50100LFTR13 TT Electronics	FIXED IND 10UH 1.3A 65 MOHM SMD	4000
HA65A-251515RLF TT Electronics	FIXED IND 15UH 2.6 MOHM SMD	7
HA72E-06R47LFTR13 TT Electronics	FIXED IND 470NH 16.1A 4.2 MOHM	3740
HM72E-121R5HLFTR13 TT Electronics	FIXED IND 1.5UH 27A 3 MOHM SMD	800
HM72E-12200HLFTR13 TT Electronics	FIXED IND 20UH 5A 40.5 MOHM SMD	626
HA72E-121R0HLFTR13 TT Electronics	FIXED IND 1UH 32A 2 MOHM SMD	800
HM72E-123R3HLFTR13 TT Electronics	FIXED IND 3.3UH 18A 6.8 MOHM SMD	661
HM72E-12R68HLFTR13 TT Electronics	FIXED IND 680NH 35A 1.6 MOHM SMD	783

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