Fixed Inductors

Part Number	Description / PDF	Quantity
1538M10 Hammond Manufacturing	FIXED IND 27UH 9A 22 MOHM TH	30
193C Hammond Manufacturing	FIXED IND 20H 100MA 181 OHM CHAS	14
159V Hammond Manufacturing	FIXED IND 1.5H 500MA 27 OHM CHAS	59
1540M11 Hammond Manufacturing	FIXED IND 50UH 9.5A 12 MOHM TH	17
1539M25 Hammond Manufacturing	FIXED IND 5MH 1.5A 1.08 OHM TH	11
159ZC Hammond Manufacturing	FIXED IND 60MH 2A 700 MOHM CHASS	61
193U Hammond Manufacturing	FIXED IND 200MH 2A 1.7 OHM CHASS	8
1540M24 Hammond Manufacturing	FIXED IND 4MH 1.75A 1.16 OHM TH	4
153M Hammond Manufacturing	FIXED IND 600MH 100MA 86 OHM	12
159Y Hammond Manufacturing	FIXED IND 600MH 750MA 11 OHM	10
1537E Hammond Manufacturing	FIXED IND 10UH 20A 6 MOHM TH	75
1532A Hammond Manufacturing	FIXED IND 10UH 1.5A 110 MOHM TH	12397
159P Hammond Manufacturing	FIXED IND 10H 125MA 155 OHM CHAS	1
1538M03 Hammond Manufacturing	FIXED IND 27UH 7A 30 MOHM TH	24
157J Hammond Manufacturing	FIXED IND 10H 65MA 205 OHM CHASS	5
153L Hammond Manufacturing	FIXED IND 900MH 75MA 125 OHM	2
1538M05 Hammond Manufacturing	FIXED IND 100UH 4.9A 61 MOHM TH	38
193D Hammond Manufacturing	FIXED IND 8H 150MA 75 OHM CHASS	6
193R Hammond Manufacturing	FIXED IND 300MH 1A 3.5 OHM CHASS	2
154M Hammond Manufacturing	FIXED IND 2H 100MA 175 OHM CHASS	3

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