Description
CD75 3-Pin SMD Boost Atomization Humidifier Inductor 25:800uH
The CD75 3-Pin SMD Boost Atomization Humidifier Inductor (25 µH : 800 µH) is a wire-wound step-up inductor / autotransformer used in ultrasonic humidifier driver circuits (usually with controllers like XKT-202). It boosts the drive voltage for the 108 kHz piezo atomizer disc.
Below are the typical technical specifications.
1. Basic Specifications
| Parameter |
Value |
| Model |
CD75 |
| Type |
Wire-wound SMD boost inductor |
| Pins |
3 pins |
| Core type |
Ferrite drum core |
| Mounting |
SMD (surface mount) |
| Structure |
Autotransformer / dual-coil |
| Application |
Ultrasonic humidifier driver |
Ferrite drum-core inductors like CD75 are widely used in DC-DC converters and compact electronics.
2. Electrical Characteristics
| Parameter |
Specification |
| Primary inductance (Pin1-Pin2) |
25 µH ±10–30% |
| Secondary inductance (Pin1-Pin3) |
800 µH ±10–30% |
| DC resistance (1-2) |
≤0.5 Ω |
| DC resistance (1-3) |
≤3–4 Ω |
| Rated current (1-2) |
~1.3–1.5 A |
| Rated current (1-3) |
~0.3 A |
| Test frequency |
1 kHz / 0.25 V |
These parameters correspond to boost inductors used in humidifier atomizer modules.
3. Mechanical Characteristics
| Parameter |
Typical Value |
| Package |
CD75 |
| Size (L × W × H) |
~7.8 × 7.0 × 5.0 mm |
| Weight |
~0.7 g |
| Mounting pads |
3 SMD pads |
| Inductance tolerance |
±10% to ±30% |
The CD75 package typically measures about 8.1 × 7.3 × 5.5 mm maximum depending on manufacturer.
4. Operating Conditions
| Parameter |
Value |
| Operating temperature |
−40 °C to +85 °C / +100 °C |
| Storage temperature |
−40 °C to +100 °C |
| Soldering temperature |
up to 260 °C reflow |
Ferrite drum-core inductors in the CD75 series are designed for high-frequency switching circuits.
5. Pin Configuration (3-Pin)
| Pins |
Function |
| 1 |
Common |
| 2 |
Primary coil (25 µH) |
| 3 |
Secondary coil (800 µH boost) |
The two coils share a common terminal, forming a step-up autotransformer used to boost the drive voltage to the ultrasonic atomizer.
6. Typical Applications
-
Ultrasonic humidifier atomizer modules
-
Mist maker circuits (108 kHz)
-
Piezo ceramic driver circuits
-
Small DC-DC boost converters
In humidifiers, the inductor boosts the 5 V drive signal to ~20–40 V AC required by the piezo atomizing disc.
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