Fixed Inductors

Part Number	Description / PDF	Quantity
AIUR-15-221K Abracon	FIXED IND 220UH 2.3A 160 MOHM TH	0
MLG0402P16NJT000 TDK Corporation	FIXED IND 16NH 140MA 2.7 OHM SMD	0
S1210-391H API Delevan	FIXED IND 390NH 692MA 400 MOHM	0
744383660082 Würth Elektronik Midcom	FIXED IND 820NH 8.8A 9.6MOHM SMD	1785
B78108S1153J000 TDK EPCOS	FIXED IND 15UH 610MA 600 MOHM TH	0
RLB1014-822KL J.W. Miller / Bourns	FIXED IND 8.2MH 150MA 24.5OHM TH	0
MLZ2012DR22DTD25 TDK Corporation	FIXED IND 220NH 900MA 130 MOHM	1370
ISC1812ES220J Vishay / Dale	FIXED IND 22UH 227MA 1.36 OHM	0
0402HS-270EGTS Delta Electronics	FIXED IND 27NH 400MA 300 MOHM	2835
SRR1050A-3R3Y J.W. Miller / Bourns	FIXED IND 3.3UH 6.5A 11 MOHM SMD	7
0805CS-821EKTS Delta Electronics	FIXED IND 820NH 180MA 2.35 OHM	3970
LQW2UASR47J0CL TOKO / Murata	FIXED IND 470NH 470MA 1.19 OHM	1995
PA4334.332NLT PulseLarsen Antenna	FIXED IND 3.3UH 1.05A 130 MOHM	0
LQP03TG3N1B02D TOKO / Murata	FIXED IND 3.1NH 400MA 320 MOHM	0
2200HT-560-V-RC J.W. Miller / Bourns	FIXED IND 56UH 6.1A 46 MOHM TH	0
MLD2016S2R2MTD25 TDK Corporation	FIXED IND 2.2UH 900MA 221 MOHM	3012
7447840015 Würth Elektronik Midcom	FIXED IND 1.5NH 300MA 100 MOHM	9725
SRR5018-1R8Y J.W. Miller / Bourns	FIXED IND 1.8UH 2.6A 35 MOHM SMD	0
CLF10060NIT-680M-D TDK Corporation	FIXED IND 68UH 1.45A 109.2 MOHM	0
MLG1005S3N6BT000 TDK Corporation	FIXED IND 3.6NH 700MA 200 MOHM	13032

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