Fixed Inductors

Part Number	Description / PDF	Quantity
WCL2520-6R8-R PowerStor (Eaton)	FIXED IND 6.8UH 175MA 2 OHM SMD	3968
5022R-203H API Delevan	FIXED IND 20UH 372MA 2.5 OHM SMD	0
AIUR-04-123J Abracon	FIXED IND 12MH 40MA 40 OHM TH	8541
74479776247 Würth Elektronik Midcom	FIXED IND 4.7UH 1A 160 MOHM SMD	0
5HC-10 API Delevan	FIXED IND 10UH 5A 15 MOHM TH	0
SBC2-3R3-352 KEMET	FIXED IND 3.3UH 3.5A 30 MOHM TH	3049
LQG15HS6N8H02D TOKO / Murata	FIXED IND 6.8NH 600MA 220 MOHM	7298
IHLP6767GZERR47M8A Vishay / Dale	FIXED IND 470NH 65A 0.95MOHM SMD	162
74404052039 Würth Elektronik Midcom	FIXED IND 3.9UH 2.4A 50.5 MOHM	1180
FDSD0420D-6R8M=P3 TOKO / Murata	FIXED IND 6.8UH 1.9A 150 MOHM	0
PA4304.102NLT PulseLarsen Antenna	FIXED IND 1UH 8.5A 11 MOHM SMD	0
1538M02 Hammond Manufacturing	FIXED IND 10UH 9A 17 MOHM TH	151
1812R-393H API Delevan	FIXED IND 39UH 211MA 4.5 OHM SMD	0
PM1210-5R6J-RC J.W. Miller / Bourns	FIXED IND 5.6UH 160MA 1.6OHM SMD	0
PA4334.821NLT PulseLarsen Antenna	FIXED IND 820NH 2.47A 39 MOHM	0
DFE201210U-2R2M=P2 TOKO / Murata	FIXED IND 2.2UH 1.2A 228 MOHM	65
ISC1812EB5R6K Vishay / Dale	FIXED IND 5.6UH 333MA 690 MOHM	0
1110-8R2M-RC J.W. Miller / Bourns	FIXED IND 8.2UH 9A 9 MOHM TH	0
MLZ1608DR47DT000 TDK Corporation	FIXED IND 470NH 500MA 420 MOHM	21686
IHLP6767GZER5R6M01 Vishay / Dale	FIXED IND 5.6UH 21A 7.05 MOHM	726

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