Vertical three pins plug in power inductor smd special for smoke detectors

 

             The essence of the three-legged inductor is a self-coupled inductor. The coil is wound around the magnetic core, forming three pins: the beginning of the winding, the middle tap, and the end of the winding. The winding is connected, and there is no electrical isolation between the windings. It belongs to a self-coupling structure and is not an independent dual-winding transformer.

 

Product parameters

Rated current	100 mA	Inductor type	Voltage transformer
Inductance	1 mH	DCR	0.02 Ω
Operating temperature range	-40°C to 85°C Shielding type: Semi-shielded	Core material	Ferrite
Self-resonant frequency	10 MHz	Test frequency	120 Hz
Saturation current (lsat)	100 mA	Reactance (XL)	2 Ω
Brand	CXWON	Tolerance	±20%

 

Common models

 

Core advantages of Surface mount inductor

1. Achieve both voltage boosting and energy storage in one step, simplifying the circuit
A single device can complete the BOOST voltage boost without the need for an additional transformer. One set of windings can handle both energy storage and voltage conversion, reducing peripheral components and simplifying PCB circuit design.
2. Smaller size, lower cost
Compared to the discrete"two-leg inductor + transformer"solution, a single three-leg inductor replaces two devices, saving PCB board space; the windings share a magnetic core, reducing material costs and assembly costs, making it suitable for low-power power supplies.
3. High coupling efficiency, low loss
The same magnetic core shares the windings, with tight magnetic coupling, and the leakage flux is relatively controllable. The conversion efficiency is high, and the heat generation is smaller, making it suitable for low-power LED drivers and adapters.
4. Multi-function reuse
The same device can be used for voltage boosting, voltage reduction, or also as EMI noise filtering; the tap can be grounded to discharge interference, suppressing high-frequency electromagnetic interference, and achieving multiple uses with one component.

 

 

Flowchart

Why choose us

Q: What is the main difference between a three-pin inductor and a regular two-pin inductor?
A: The two-pin inductor can only store energy and filter; the three-pin inductor has an additional middle tap, which enables step-up or step-down voltage conversion through the turns ratio. It has both the functions of energy storage and voltage transformation, making the circuit more streamlined.

Q: What are the definitions of the three pins of the three-pin inductor?
A: They are: the beginning of the winding, the middle tap, and the end of the winding. The tap divides the coil into two sections with different turns, which is the core structure for voltage transformation.

Q: Is the three-pin inductor a common-mode inductor?
A: No. Common-mode inductor is a dual-winding isolated structure, with the majority being four-pin; the three-pin inductor is a single-winding connected structure without electrical isolation, and belongs to a self-coupled step-up inductor.

Q: Can the three-pin inductor be used for voltage reduction?
A: Yes. Connect the coil to the input terminals, and connect the tap to the single end. By cutting off a few turns of the coil, a voltage reduction output can be achieved, which is a multi-functional multipurpose device.

Q: What parameters do you mainly consider when selecting a three-pin inductor?
A: The core parameters to consider are the turns ratio, inductance value, rated current, saturation current, operating frequency, and size and packaging. The turns ratio directly determines the step-up ratio and is the first parameter for selection.