Fixed Inductors

Part Number	Description / PDF	Quantity
MPIA4020V2-R68-R PowerStor (Eaton)	FIXED IND 680NH 7.5A 16 MOHM SMD	0
1025R-96K API Delevan	FIXED IND 120NH 1.3A 90 MOHM TH	0
LQH43MN390J03L TOKO / Murata	FIXED IND 39UH 240MA 1.4 OHM SMD	0
MLG0603P22NJT000 TDK Corporation	FIXED IND 22NH 150MA 1.9 OHM SMD	8656
ASPI-2512-100M-T2 Abracon	FIXED IND 10UH 590MA 630 MOHM	0
SRP3020TA-8R2M J.W. Miller / Bourns	FIXED IND 8.2UH 1.6A 390MOHM SMD	292
23S120C Murata Power Solutions	FIXED IND 12UH 1.08A 107 MOHM	0
IMC1210BNR27J Vishay / Dale	FIXED IND 270NH 456MA 360 MOHM	0
SRR4828A-151M J.W. Miller / Bourns	FIXED IND 150UH 600MA 860MOHM SM	0
HF1008R-180J API Delevan	FIXED IND 18NH 965MA 130 MOHM	0
7687714222 Würth Elektronik Midcom	FIXED IND 2.2MH 260MA 6.5 OHM	616
7443739650056 Würth Elektronik Midcom	FIXED IND 330NH 29.5A 0.8 MOHM	882
NLV32T-R33J-PF TDK Corporation	FIXED IND 330NH 450MA 400 MOHM	5824
IMC1210ETR18K Vishay / Dale	FIXED IND 180NH 518MA 280 MOHM	0
74404084010 Würth Elektronik Midcom	FIXED IND 1UH 6.3A 8 MOHM SMD	0
AISM-1812-681K-T Abracon	FIXED IND 680UH 50MA 30 OHM SMD	0
IHLE5050FHER3R3M5A Vishay / Dale	FIXED IND 3.3UH 20.2A 5.44 MOHM	25
5022R-151G API Delevan	FIXED IND 150NH 3.5A 30 MOHM SMD	0
SRP5030TA-R33M J.W. Miller / Bourns	FIXED IND 330NH 14A 5 MOHM SMD	3558
1538M15 Hammond Manufacturing	FIXED IND 5UH 19A 6 MOHM 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