Fixed Inductors

Part Number	Description / PDF	Quantity
ER153722KS API Delevan	FIXED IND 2.7UH 385MA 1.2 OHM TH	394
0819-62J API Delevan	FIXED IND 39UH 83.5MA 6.8 OHM TH	0
S1210-561K API Delevan	FIXED IND 560NH 619MA 500 MOHM	0
8532-44K API Delevan	FIXED IND 3.9MH 200MA 8.63 OHM	0
1812R-333K API Delevan	FIXED IND 33UH 224MA 4 OHM SMD	0
1025-10K API Delevan	FIXED IND 390NH 710MA 300 MOHM	0
0819-08H API Delevan	FIXED IND 220NH 645MA 250 MOHM	0
P1812R-473H API Delevan	FIXED IND 47UH 260MA 2.064 OHM	0
1537-58J API Delevan	FIXED IND 43UH 194MA 2.7 OHM TH	0
M27/367-05 API Delevan	FIXED IND 470NH 6A 10 MOHM SMD	0
ER1537-30KR API Delevan	FIXED IND 5.6UH 495MA 320 MOHM	537
5022R-754F API Delevan	FIXED IND 750UH 112MA 28.6 OHM	0
1025-76K API Delevan	FIXED IND 220UH 52MA 21 OHM TH	7218
5022-364G API Delevan	FIXED IND 360UH 171MA 12.5 OHM	0
5022-333F API Delevan	FIXED IND 33UH 337MA 3 OHM SMD	0
0819-46G API Delevan	FIXED IND 8.2UH 104MA 4.4 OHM TH	0
0819-16J API Delevan	FIXED IND 470NH 410MA 620 MOHM	0
1026-10K API Delevan	FIXED IND 56NH 1.7A 50 MOHM TH	0
P3519R-105J API Delevan	FIXED IND 1MH 105MA 26.74 OHM	0
5022R-221F API Delevan	FIXED IND 220NH 2.58A 55 MOHM	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