Fixed Inductors

Part Number	Description / PDF	Quantity
MGV0302R68M-10 Laird - Performance Materials	FIXED IND 680NH 5.5A 29MOHM SMD	0
SDR7045-6R8M J.W. Miller / Bourns	FIXED IND 6.8UH 2.25A 54MOHM SMD	0
PE-0603CD120GTT PulseLarsen Antenna	FIXED IND 12NH 700MA 130 MOHM	3909
LQH43PH100M26L TOKO / Murata	FIXED IND 10UH 1.17A 176.4 MOHM	483
L-07C12NKV6T Johanson Technology	FIXED IND 12NH 250MA 500 MOHM	0
0805CS-3N3EJTS Delta Electronics	FIXED IND 3.3NH 600MA 80 MOHM	5937
SL3732A-R12KHF ITG Electronics, Inc.	0.12UH, 10%, 0.29MOHM, 80AMP MAX	780
LQP03TG2N7C02D TOKO / Murata	FIXED IND 2.7NH 450MA 250 MOHM	0
MLG0402Q1N9CT000 TDK Corporation	FIXED IND 1.9NH 200MA 600 MOHM	0
MGV12031R5M-10 Laird - Performance Materials	FIXED IND 1.5UH 19A 5.5 MOHM SMD	1000
MLP2520S100ST0S1 TDK Corporation	FIXED IND 10UH 700MA 364 MOHM	13911
S1210-104G API Delevan	FIXED IND 100UH 127MA 10 OHM SMD	0
VLF504012MT-2R2M-CA TDK Corporation	FIXED IND 2.2UH 2.71A 55 MOHM	370
2727-21G API Delevan	FIXED IND 470UH 84MA 27 OHM TH	0
MHQ1005P3N5CTD25 TDK Corporation	FIXED IND 3.5NH 900MA 90 MOHM	0
1210-039K API Delevan	FIXED IND 3.9NH 1.562A 50 MOHM	0
AIUR-07-470K Abracon	FIXED IND 47UH 570MA 320 MOHM TH	0
LMCI1005-6N8KT Venkel LTD	FIXED IND 6.8NH 300MA 300 MOHM	0
5022R-511G API Delevan	FIXED IND 510NH 1.68A 130 MOHM	0
LQH32MN150J23L TOKO / Murata	FIXED IND 15UH 170MA 2.2 OHM SMD	1276

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