Fixed Inductors

Part Number	Description / PDF	Quantity
DLH-22-0005 Schurter	FIXED IND 300UH 1.8A 180 MOHM TH	50
DLH-31-0007 Schurter	FIXED IND 130UH 4A 53 MOHM TH	140
DLO1-24-0007 Schurter	FIXED INDUCTOR 600MA 1.55 OHM TH	0
DSH-22-0001 Schurter	FIXED INDUCTOR 450MA 1.25 OHM TH	100
DSH-22-0004 Schurter	FIXED INDUCTOR 1.4A 160 MOHM TH	40
DFSG-30-0001 Schurter	FIXED INDUCTOR 3A 165 MOHM TH	28
DLH-14-0001 Schurter	FIXED IND 500UH 600MA 750 MOHM	164200
DSH-14-0001 Schurter	FIXED IND 600MA 280 MOHM TH	153
DSH-22-0008 Schurter	FIXED INDUCTOR 4.5A 8 MOHM TH	50
DENO-25-0001 Schurter	FIXED INDUCTOR 16A 27 MOHM TH	20550
DFSG-30-0002 Schurter	FIXED INDUCTOR 6A 60 MOHM TH	78
DLO1-24-0001 Schurter	FIXED INDUCTOR 7A 12 MOHM TH	186
DLH-31-0005 Schurter	FIXED IND 300UH 2.5A 160 MOHM TH	0
DLH-22-0001 Schurter	FIXED IND 5MH 450MA 2.6 OHM TH	0
DFSG-25-0001 Schurter	FIXED INDUCTOR 2A 260 MOHM TH	80
DLH-22-0008 Schurter	FIXED IND 20UH 7A 12 MOHM TH	48
DLH-22-0006 Schurter	FIXED IND 100UH 3A 70 MOHM TH	158
DLO1-24-0008 Schurter	FIXED INDUCTOR 450MA 3 OHM TH	0
DLH-14-0002 Schurter	FIXED IND 200UH 1A 220 MOHM TH	168
DEHL-10-0001 Schurter	FIXED INDUCTOR 16A 15 MOHM TH	86

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