Fixed Inductors

Part Number	Description / PDF	Quantity
DRAP127-820-R PowerStor (Eaton)	FIXED IND 82UH 2.01A 186 MOHM	0
MLG0402P1N5ST000 TDK Corporation	FIXED IND 1.5NH 220MA 600 MOHM	0
MCL1608V1-6R8-R PowerStor (Eaton)	FIXED IND 6.8UH 60MA 900 MOHM	0
AISC-0805-R12G-T Abracon	FIXED IND 120NH 400MA 510 MOHM	0
B82432T1392K000 TDK EPCOS	FIXED IND 3.9UH 850MA 200 MOHM	0
1840-09K API Delevan	FIXED IND 820NH 1.24A 180 MOHM	0
CM322522-R12ML J.W. Miller / Bourns	FIXED IND 120NH 240MA 670MOHM SM	0
7447745330 Würth Elektronik Midcom	FIXED IND 33UH 900MA 520 MOHM	100
CB2016T3R3M TAIYO YUDEN	FIXED IND 3.3UH 800MA 260 MOHM	2694
MLG0603S11NJTD25 TDK Corporation	FIXED IND 11NH 200MA 800 MOHM	0
B82496C3680J000 TDK EPCOS	FIXED IND 68NH 230MA 1.3 OHM SMD	5865
LQP03TN5N6H02D TOKO / Murata	FIXED IND 5.6NH 350MA 400 MOHM	244653
MLZ2012M1R0HT000 TDK Corporation	FIXED IND 1UH 800MA 100 MOHM SMD	34897
AIUR-06-151K Abracon	FIXED IND 150UH 1.9A 162 MOHM TH	0
1812-223G API Delevan	FIXED IND 22UH 250MA 3.2 OHM SMD	0
PA4546.151NLT PulseLarsen Antenna	FIXED IND 150NH 10A 6.8 MOHM SMD	0
22R335C Murata Power Solutions	FIXED IND 3.3MH 100MA 11 OHM TH	1372
ASPI-U201610-4R7M-T Abracon	FIXED INDUCTOR 4.7UH 1.25A SMD	0
MBH6045C-101MB=P3 TOKO / Murata	FIXED IND 100UH 830MA 408 MOHM	0
SRP0410-3R3K J.W. Miller / Bourns	FIXED IND 3.3UH 2.4A 120 MOHM	250

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