Fixed Inductors

Part Number	Description / PDF	Quantity
1539M29 Hammond Manufacturing	FIXED IND 1MH 4.4A 183 MOHM TH	9
1539M22 Hammond Manufacturing	FIXED IND 500UH 5A 90 MOHM TH	0
1539M11 Hammond Manufacturing	FIXED IND 10UH 17A 6 MOHM TH	40
195G75 Hammond Manufacturing	FIXED IND 5MH 75A 10 MOHM CHASS	2
195J50 Hammond Manufacturing	FIXED IND 10MH 50A 23 MOHM CHASS	1
1537L Hammond Manufacturing	FIXED IND 100UH 8A 50 MOHM TH	146
159ZG Hammond Manufacturing	FIXED IND 15MH 4A 250 MOHM CHASS	17
1540M14 Hammond Manufacturing	FIXED IND 1.25MH 1.75A 850 MOHM	0
193H Hammond Manufacturing	FIXED IND 5H 200MA 65 OHM CHASS	6
159S Hammond Manufacturing	FIXED IND 4H 225MA 65 OHM CHASS	5
1538M18 Hammond Manufacturing	FIXED IND 50UH 10.5A 20 MOHM TH	16
195C30 Hammond Manufacturing	FIXED IND 1MH 30A 9 MOHM CHASSIS	29
1536T Hammond Manufacturing	FIXED IND 100UH 2A 216 MOHM TH	335
1540M12 Hammond Manufacturing	FIXED IND 150UH 4.75A 46 MOHM TH	39
157D Hammond Manufacturing	FIXED IND 1MH 10A 38 MOHM CHASS	46
193LP Hammond Manufacturing	FIXED IND 5H 300MA 55 OHM CHASS	3
159ZB Hammond Manufacturing	FIXED IND 320MH 600MA 7.8 OHM	34
158SA Hammond Manufacturing	FIXED IND 1H 240MA 41 OHM CHASS	15
193NP Hammond Manufacturing	FIXED IND 3H 500MA 36 OHM CHASS	1
1538M12 Hammond Manufacturing	FIXED IND 68UH 7.3A 34 MOHM TH	49

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