Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	TFL0816-47N Susumu	FIXED IND 47NH 180MA 3 OHM SMD	0
	TFL0816-33N Susumu	FIXED IND 33NH 200MA 2 OHM SMD	0
	PCMC135T-R50MF Susumu	FIXED IND 500NH 36A 1.5 MOHM SMD	0
	HPL0603-1N0 Susumu	FIXED IND 1NH 510MA 240 MOHM SMD	0
	HPL1005-2N0 Susumu	FIXED IND 2NH 980MA 140 MOHM SMD	0
	PCMC135T-R68MF Susumu	FIXED IND 680NH 34A 1.7 MOHM SMD	0
	PCMC135T-2R2MF Susumu	FIXED IND 2.2UH 20A 5.5 MOHM SMD	0
	PCMC053T-R68MN Susumu	FIXED IND 680NH 8.5A 12 MOHM SMD	0
	HPL0603-7N5 Susumu	FIXED IND 7.5NH 170MA 1.8 OHM	0
	TFL0816-3N9 Susumu	FIXED IND 3.9NH 700MA 200 MOHM	0
	TFL0816-27N Susumu	FIXED IND 27NH 200MA 2 OHM SMD	0
	HPL1005-6N8 Susumu	FIXED IND 6.8NH 430MA 800 MOHM	0
	PCMC135T-R56MF Susumu	FIXED IND 560NH 36A 1.5 MOHM SMD	0
	HPL1005-4N3 Susumu	FIXED IND 4.3NH 550MA 460 MOHM	0
	HPL0603-2N7 Susumu	FIXED IND 2.7NH 340MA 540 MOHM	0
	PCMC133E-2R2MF Susumu	FIXED IND 2.2UH 16A 8 MOHM SMD	0
	TFL0816-2N7 Susumu	FIXED IND 2.7NH 800MA 150 MOHM	0
	HPL0603-8N2 Susumu	FIXED IND 8.2NH 170MA 1.8 OHM	0
	PCMC135T-R47MF Susumu	FIXED IND 470NH 38A 1.3 MOHM SMD	0
	PCMC135T-1R0MF Susumu	FIXED IND 1UH 29A 2.5 MOHM SMD	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