Fixed Inductors

Part Number	Description / PDF	Quantity
SDR1005-471KL J.W. Miller / Bourns	FIXED IND 470UH 450MA 1.7OHM SMD	4576
6000-181K-RC J.W. Miller / Bourns	FIXED IND 180UH 1.08A 580MOHM TH	0
AH42328A-R22KHF ITG Electronics, Inc.	FIXED IND 220NH 73A 0.18 MOHM	90
SBCP-11HY680H KEMET	FIXED IND 68UH 1.8A 120 MOHM TH	382
LMXN2216M2R2BTAS Elco (AVX)	FIXED IND 2.2UH 6 MOHM SMD	0
NLCV32T-1R5M-PFRD TDK Corporation	FIXED IND 1.5UH 1.4A 114 MOHM	0
SRR4018-820Y J.W. Miller / Bourns	FIXED IND 82UH 430MA 1.2 OHM SMD	0
L-15WR12JV4E Johanson Technology	FIXED IND 120NH 500MA 480 MOHM	0
SRP1038A-1R2M J.W. Miller / Bourns	FIXED IND 1.2UH 17A 3.8 MOHM SMD	0
9250A-183-RC J.W. Miller / Bourns	FIXED IND 18UH 300MA 890 MOHM TH	273
B82144B1332K000 TDK EPCOS	FIXED IND 3.3UH 1.95A 100 MOHM	0
P1170.302NLT PulseLarsen Antenna	FIXED IND 3UH 8.3A 7.7 MOHM SMD	0
IMC1812EB18NM Vishay / Dale	FIXED IND 18NH 450MA 200 MOHM	0
NLV25T-680J-PFD TDK Corporation	FIXED IND 68UH 70MA 16.6 OHM SMD	0
MPXV1D0630L1R5 KEMET	FIXED IND 1.5UH 10.5A 12.7 MOHM	1000
FP1308R2-R32-R PowerStor (Eaton)	FIXED IND 320NH 45A 0.53 MOHM	0
SH150S-0.82-78 Amgis	FIXED IND 78UH 820MA 300 MOHM	0
MHQ0603P36NHT000 TDK Corporation	FIXED IND 36NH 160MA 2.8 OHM SMD	5130
PA4344.104NLT PulseLarsen Antenna	FIXED IND 100UH 5.3A 118 MOHM	1332
SDE0403A-1R0M J.W. Miller / Bourns	FIXED IND 1UH 2.7A 48 MOHM SMD	1051

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