Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	1530B336 Hammond Manufacturing	FIXED IND 3.3UH 912MA 240 MOHM	0
	1535D Hammond Manufacturing	FIXED IND 5MH 160MA 14 OHM TH	0
	1530B475 Hammond Manufacturing	FIXED IND 47UH 188MA 3.36 OHM TH	0
	1530B334 Hammond Manufacturing	FIXED IND 330UH 103MA 13.9 OHM	0
	1530B476 Hammond Manufacturing	FIXED IND 4.7UH 661MA 457 MOHM	0
	1530C823 Hammond Manufacturing	FIXED IND 8.2MH 40MA 92.4 OHM TH	0
	1535J Hammond Manufacturing	FIXED IND 25MH 65MA 82 OHM TH	0
	1530B276 Hammond Manufacturing	FIXED IND 2.7UH 1.091A 168 MOHM	0
	1530B685 Hammond Manufacturing	FIXED IND 68UH 169MA 4.2 OHM TH	0
	1530C683 Hammond Manufacturing	FIXED IND 6.8MH 43MA 78 OHM TH	0
	1530B565 Hammond Manufacturing	FIXED IND 56UH 176MA 3.84 OHM TH	0
	1534A Hammond Manufacturing	FIXED IND 1MH 160MA 8.6 OHM TH	0
	1530C102 Hammond Manufacturing	FIXED IND 10MH 38MA 101 OHM TH	0
	1530C473 Hammond Manufacturing	FIXED IND 4.7MH 48MA 64.8 OHM TH	0
	1530B156 Hammond Manufacturing	FIXED IND 1.5UH 1.443A 96 MOHM	0
	1530B224 Hammond Manufacturing	FIXED IND 220UH 114MA 11.5 OHM	0
	622W Hammond Manufacturing	FIXED IND 220MH 6.4MA 122 OHM TH	0
	1530B825 Hammond Manufacturing	FIXED IND 82UH 158MA 4.8 OHM TH	0
	1535G Hammond Manufacturing	FIXED IND 10MH 100MA 31 OHM TH	0
	1530B105 Hammond Manufacturing	FIXED IND 10UH 277MA 1.56 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