Fixed Inductors

Image	Part Number	Description / PDF	Quantity	Rfq
	0819-94G API Delevan	FIXED IND 820UH 25.5MA 72 OHM TH	0
	P1812R-104G API Delevan	FIXED IND 100UH 180MA 4.32 OHM	0
	1812-184G API Delevan	FIXED IND 180UH 145MA 9.5 OHM	0
	2474-22L API Delevan	FIXED IND 56UH 1.65A 130 MOHM TH	0
	5022-512F API Delevan	FIXED IND 5.1UH 1.04A 300 MOHM	0
	P3519-271K API Delevan	FIXED IND 270NH 3.17A 20 MOHM	0
	2727-13F API Delevan	FIXED IND 100UH 140MA 9.7 OHM TH	0
	DC780-152L API Delevan	FIXED IND 1.5UH 11.4A 3 MOHM TH	0
	S1008-272K API Delevan	FIXED IND 2.7UH 365MA 850 MOHM	0
	S1008R-911J API Delevan	FIXED IND 910NH 685MA 240 MOHM	0
	HRSPD127-274M API Delevan	FIXED IND 270UH 1.05A 492MOHM SM	0
	5022-152F API Delevan	FIXED IND 1.5UH 855MA 500 MOHM	0
	P1330-102K API Delevan	FIXED IND 1UH 2.78A 35 MOHM SMD	0
	1537-54J API Delevan	FIXED IND 36UH 202MA 2.5 OHM TH	0
	SP1812R-392J API Delevan	FIXED IND 3.9UH 1A 200 MOHM SMD	0
	4922-33L API Delevan	FIXED IND 470UH 350MA 3.25 OHM	0
	2727-07G API Delevan	FIXED IND 33UH 240MA 3.3 OHM TH	0
	DC780R-185K API Delevan	FIXED IND 1.8MH 800MA 1.39 OHM	0
	SP1812R-393H API Delevan	FIXED IND 39UH 354MA 1.6 OHM SMD	0
	ER1641-273KR API Delevan	FIXED IND 27UH 260MA 1.19 OHM 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