Fixed Inductors

Part Number	Description / PDF	Quantity
1008-151K API Delevan	FIXED IND 150NH 1.168A 110 MOHM	0
8532R-02K API Delevan	FIXED IND 1.2UH 5.95A 10 MOHM	0
SP1812-472K API Delevan	FIXED IND 4.7UH 969MA 210 MOHM	0
1812R-152J API Delevan	FIXED IND 1.5UH 578MA 600 MOHM	143
0819-76G API Delevan	FIXED IND 150UH 51MA 18 OHM TH	0
SP1210-682J API Delevan	FIXED IND 6.8UH 576MA 630 MOHM	0
5022R-432F API Delevan	FIXED IND 4.3UH 390MA 2.4 OHM	0
1210-333K API Delevan	FIXED IND 33UH 182MA 5.6 OHM SMD	0
P1812R-224G API Delevan	FIXED IND 220UH 120MA 9.68 OHM	0
SP1210-124J API Delevan	FIXED IND 120UH 147MA 9.6 OHM	0
ER1641-823KR API Delevan	FIXED IND 82UH 170MA 2.7 OHM TH	250
1025-12K API Delevan	FIXED IND 470NH 660MA 350 MOHM	727
5022-361J API Delevan	FIXED IND 360NH 1.935A 98 MOHM	0
103-271JS API Delevan	FIXED IND 270NH 650MA 230 MOHM	0
HF1008-122J API Delevan	FIXED IND 1.2UH 320MA 1.45 OHM	0
1210-270J API Delevan	FIXED IND 27NH 743MA 220 MOHM	0
2727-07H API Delevan	FIXED IND 33UH 240MA 3.3 OHM TH	0
5022R-624G API Delevan	FIXED IND 620UH 119MA 25.9 OHM	0
1812-333G API Delevan	FIXED IND 33UH 224MA 4 OHM SMD	0
HF1008-751H API Delevan	FIXED IND 750NH 275MA 1.95 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