Fixed Inductors

Part Number	Description / PDF	Quantity
LMLP0303N1R5CTAR Elco (AVX)	FIXED IND 1.5UH 1.3A 80 MOHM SMD	20002000
AS0706N9JTR Elco (AVX)	FIXED IND 6.9NH 2.7A 6 MOHM SMD	0
LMLP06C6N6R0CTAS Elco (AVX)	FIXED IND 6UH 2.5A 40 MOHM SMD	0
LMLP06B6M220CTAS Elco (AVX)	FIXED IND 22UH 950MA 290 MOHM	0
LMLP0707M5R6DTAS Elco (AVX)	FIXED IND 5.6UH 4A 68MOHM SMD	1365
HLC021R5BTTR Elco (AVX)	FIXED IND 1.5NH 679MA 150 MOHM	2928
LMLP0505M100CTAR Elco (AVX)	FIXED IND 10UH 940MA 480 MOHM	0
LMLP1011M4R7DTAS Elco (AVX)	FIXED IND 4.7UH 8.5A 20MOHM SMD	845
HL021R2BTTR Elco (AVX)	FIXED IND 1.2NH 343MA 107 MOHM	7376
HLQ022R7BTTR Elco (AVX)	FIXED IND 2.7NH 245MA 250 MOHM	0
HL022R7BTTR Elco (AVX)	FIXED IND 2.7NH 327MA 219 MOHM	0
LMLP0404N1R0CTAS Elco (AVX)	FIXED IND 1UH 1.05A 100MOHM SMD	5000
LMLP06C6M100CTAS Elco (AVX)	FIXED IND 10UH 1.9A 65 MOHM SMD	0
LMLP13B3M680DTAS Elco (AVX)	FIXED IND 68UH 2A 134MOHM SMD	400
HL021R3BTTR Elco (AVX)	FIXED IND 1.3NH 342MA 113 MOHM	0
HL023R3BTTR Elco (AVX)	FIXED IND 3.3NH 321MA 265 MOHM	4
LMLP0202N6R8CTAR Elco (AVX)	FIXED IND 6.8UH 570MA 410 MOHM	2500
L08055R6DEWTR Elco (AVX)	FIXED IND 5.6NH 750MA 100 MOHM	10
L04026R8BHLTR Elco (AVX)	FIXED IND 6.8NH 200MA 900 MOHM	0
L08053R9BEWTR Elco (AVX)	FIXED IND 3.9NH 750MA 200 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