Fixed Inductors

Part Number	Description / PDF	Quantity
IHSM7832ER122L Vishay / Dale	FIXED IND 1.2MH 460MA 2.68 OHM	0
5022-333F API Delevan	FIXED IND 33UH 337MA 3 OHM SMD	0
ISC1210ERR33M Vishay / Dale	FIXED IND 330NH 475MA 360 MOHM	0
LQH43MN270K03L TOKO / Murata	FIXED IND 27UH 300MA 1.1 OHM SMD	266
39H562C Murata Power Solutions	FIXED IND 5.6UH 8.2A 11.4 MOHM	0
SRP0510-R47K J.W. Miller / Bourns	FIXED IND 470NH 5A 38 MOHM SMD	300
IMC1210ER2R7J Vishay / Dale	FIXED IND 2.7UH 290MA 1.1 OHM	0
ASPIAIG-S4035-1R0M-T Abracon	FIXED IND 1UH 4.5A 24MOHM SMD	1690
SDR0604-100ML J.W. Miller / Bourns	FIXED IND 10UH 1.45A 100MOHM SMD	24
ELL-6PM270M Panasonic	FIXED IND 27UH 620MA 220 MOHM	799
CLF10040T-471M-H TDK Corporation	FIXED IND 470UH 560MA 1.21 OHM	587
PM0603-R15J-RC J.W. Miller / Bourns	FIXED IND 150NH 280MA 920MOHM SM	0
LQH2HPZ1R0MDRL TOKO / Murata	FIXED IND 1UH 960MA 288 MOHM SMD	0
MPLCG0530LR33 KEMET	FIXED IND 330NH 10.3A 7.3 MOHM	3495
BRC1608TR82M6 TAIYO YUDEN	FIXED IND 820NH 730MA 176 MOHM	1784
2122-V-RC J.W. Miller / Bourns	FIXED IND 680UH 1.4A 330 MOHM TH	0
1538M16 Hammond Manufacturing	FIXED IND 10UH 16A 8 MOHM TH	25
DPO-3.0-150 Talema	FIXED IND 150UH 3A 107 MOHM TH	0
CDR7D28MNNP-1R2NC Sumida Corporation	FIXED IND 1.2UH 4.5A 20.5 MOHM	18
74435580680 Würth Elektronik Midcom	FIXED IND 6.8UH 28.5A 2.1 MOHM	1413

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