| Image | Part Number | Description / PDF | Quantity | Rfq |
|---|---|---|---|---|
 |
Knowles Johanson Manufacturing |
ADJUSTABLE INDUCTOR 60NH SMD |
162 |
|
 |
Knowles Johanson Manufacturing |
ADJUSTABLE INDUCTOR 48NH SMD |
262 |
|
 |
Knowles Johanson Manufacturing |
ADJUSTABLE INDUCTOR 74NH SMD |
328 |
|
 |
Knowles Johanson Manufacturing |
ADJUSTABLE INDUCTOR 30NH SMD |
148 |
|
 |
Knowles Johanson Manufacturing |
ADJUSTABLE INDUCTOR 74NH SMD |
114 |
|
 |
Knowles Johanson Manufacturing |
ADJUSTABLE INDUCTOR 88NH SMD |
883 |
|
Adjustable inductors are electromagnetic components with variable inductance values, enabling precise control of current and voltage in electronic circuits. Unlike fixed inductors, these components incorporate mechanical or electronic adjustment mechanisms to modify their magnetic properties. They play critical roles in RF tuning circuits, power supply regulation, and signal processing systems, offering flexibility in modern electronics such as communication devices, automotive electronics, and industrial control systems.
| Type | Functional Characteristics | Application Examples |
|---|---|---|
| Variable Inductors | Mechanically adjustable magnetic cores | Radio frequency tuning circuits |
| Digitally Controlled Inductors | Programmable inductance via IC interfaces | Smart power supplies |
| Magnetically Adjustable Inductors | External magnetic field control | Industrial motor drives |
| Step-Tunable Inductors | Discrete inductance level selection | Telecom infrastructure equipment |
Typical adjustable inductors consist of: - Bobbin-wound copper coils with enamel insulation - Adjustable magnetic cores (ferrite, powdered iron, or amorphous alloys) - Mechanical adjustment mechanisms (screw actuators or rotary knobs) - Shielded enclosures for EMI reduction - Termination options (SMD pads or through-hole leads) The core movement mechanism enables inductance variation by altering magnetic flux paths, with precision tolerances down to 1%.
| Parameter | Description | Importance |
|---|---|---|
| Inductance Range | Adjustable value span (e.g., 1-100 H) | Determines application flexibility |
| Q Factor | Quality factor (50-300 typical range) | Affects frequency selectivity |
| Rated Current | Max DC/AC current capacity | Prevents saturation failure |
| Temperature Stability | 0.05%/ C typical drift | Ensures performance consistency |
Primary applications include: - Telecommunications: 5G base stations, software-defined radios - Automotive: EV charging systems, ADAS sensors - Industrial: Smart grid controllers, motor drives - Consumer Electronics: Wireless chargers, audio filters - Medical: MRI scanner gradient coils, implantable devices
| Manufacturer | Product Series | Key Features |
|---|---|---|
| Coilcraft | X2XX Adjustable Inductors | 100 nH-10 H range, 18 GHz bandwidth |
| TDK | EFM Series | Automotive-grade, AEC-Q200 compliant |
| Bourns | 434 Series | PCB-mount, 1-100 MHz operation |
| API Delevan | 7000 Series | High-precision ( 0.5%) military-grade |
Key considerations: - Required inductance range and adjustment resolution - Operating frequency vs. Q factor requirements - Current rating with safety derating margin - Environmental conditions (temperature, vibration) - Mounting compatibility (SMD vs. through-hole) Application Case: In RF filter design, select high-Q ( 150) inductors with sub-nH precision to meet 2.4 GHz ISM band requirements.
Current development trends include: - Miniaturization through advanced magnetic materials - Integration with sensor networks for smart systems - Digital control interfaces (I2C/PWM compatibility) - Increased power density for EV applications - Enhanced temperature stability (-55 C to +155 C operation)