Fixed Inductors

Part Number	Description / PDF	Quantity
S1008R-621J API Delevan	FIXED IND 620NH 770MA 190 MOHM	0
P1812R-822K API Delevan	FIXED IND 8.2UH 600MA 548 MOHM	0
1210R-333F API Delevan	FIXED IND 33UH 182MA 5.6 OHM SMD	0
SP1210R-154G API Delevan	FIXED IND 150UH 124MA 13.5 OHM	0
103-271J API Delevan	FIXED IND 270NH 650MA 230 MOHM	0
1537-88J API Delevan	FIXED IND 180UH 123MA 6.75 OHM	0
1025R-18K API Delevan	FIXED IND 820NH 420MA 850 MOHM	931
SDS680R-152M API Delevan	FIXED IND 1.5UH 2.8A 45 MOHM SMD	4363
5022-113F API Delevan	FIXED IND 11UH 565MA 1.05 OHM	0
HF1008R-151K API Delevan	FIXED IND 150NH 395MA 950 MOHM	0
0819-64G API Delevan	FIXED IND 47UH 76MA 8.2 OHM TH	0
103-391G API Delevan	FIXED IND 390NH 635MA 240 MOHM	0
S1812R-334K API Delevan	FIXED IND 330UH 129MA 12 OHM SMD	2949
0819-18F API Delevan	FIXED IND 560NH 510MA 180 MOHM	0
5022R-203H API Delevan	FIXED IND 20UH 372MA 2.5 OHM SMD	0
5HC-10 API Delevan	FIXED IND 10UH 5A 15 MOHM TH	0
1812R-393H API Delevan	FIXED IND 39UH 211MA 4.5 OHM SMD	0
0819-82G API Delevan	FIXED IND 270UH 39MA 30.5 OHM TH	0
1812-560M API Delevan	FIXED IND 56NH 770MA 250 MOHM	0
8532-48H API Delevan	FIXED IND 8.2MH 130MA 20.8 OHM	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