Can I power this 18x18x4mm fan using a 3.3V power source?

Yes, you can power this fan using a 3.3V source, as indicated by the manufacturer's P&Q performance curve. However, please note that running the fan at 3.3V will result in a lower rotational speed and reduced airflow compared to its optimal 5V rating.

What is the difference between a sleeve bearing and a ball bearing fan?

A sleeve bearing fan uses a lubricated sleeve to reduce friction, which makes it quieter at low speeds and more cost-effective, but it has a shorter lifespan if mounted horizontally. A ball bearing fan is noisier and more expensive but can be mounted in any orientation without affecting its lifespan.

Does this fan support PWM speed control or RPM monitoring?

No, this specific model is a standard 2-wire fan (red and black wires only), meaning it does not support dedicated PWM signal control or FG (Frequency Generator) RPM monitoring. To adjust its speed, you must lower the input voltage using a buck converter.

Are these micro fans available for immediate pickup in Hong Kong?

Yes, these 18x18x4mm 5V micro fans are in-stock for instant pickup at Sun Cheong Computer Co. Ltd. (新昌電腦有限公司) located in Sham Shui Po. Our physical store caters to DIY makers, and you can purchase them in single units or bulk quantities for your projects.

Is this fan suitable for cooling a Raspberry Pi 4?

While this fan can operate on the Raspberry Pi's 5V pins, its 18x18mm size is much smaller than the standard 30x30mm or 40x40mm fans typically used for a Raspberry Pi 4. It is better suited for cooling specific, individual microchips or being embedded inside extremely tight custom Pi enclosures.

18x18x4mm 5V DC Micro Fan | Ultra-Thin Cooling

Name: 18x18x4mm 5V DC Micro Fan | Ultra-Thin Cooling
Brand: Sun Cheong Computer Company Limited
SKU: 21FN000284
Price: 148.0 TWD
Availability: InStock

Short Product Description

The 18x18x4mm 5V DC Micro Brushless Fan is an ultra-thin, lightweight (2g) cooling solution designed for extremely compact electronics, micro-drones, and wearable tech. Featuring a quiet sleeve bearing and a fire-retardant PBT frame, this 2-wire fan delivers reliable active cooling in spaces where standard fans simply cannot fit. In-stock at our Sham Shui Po store for instant pickup, Sun Cheong Computer Co. Ltd. (新昌電腦有限公司) provides the perfect miniature thermal management components for your space-constrained DIY projects.

Key Features

Ultra-Compact Footprint: Measures exactly 18x18x4mm, making it one of the smallest active cooling fans available for tight enclosures.
Featherlight 2g Weight: Adds virtually no weight to your project, perfect for micro-drones, RC vehicles, and wearable electronics.
Fire-Retardant Material: Constructed from UL 94V-0 rated thermoplastic PBT, ensuring high thermal stability and safety.
Quiet Sleeve Bearing: Utilizes a sleeve bearing system for smooth, low-vibration rotation in noise-sensitive applications.
Simple 2-Wire Operation: Features standard red (positive) and black (negative) wires for easy, plug-and-play 5V DC power connection.
Broad Certifications: CE, RoHS, and UR (UL Recognized) certified for reliable and safe integration into commercial prototypes.

Full Product Description

Ultra-Thin Active Cooling for Microelectronics

This 18x18x4mm DC 5V Fan provides essential active cooling for space-constrained devices where standard fans are too bulky to install. With an incredibly slim 4mm profile, it easily slips into tight 3D-printed enclosures, compact VR headsets, or densely packed custom PCBs to prevent microchips from thermal throttling. Its straightforward 2-wire design means you can power it directly from any standard 5V DC source without worrying about complex PWM signal wiring.

Lightweight and Fire-Retardant Build

Weighing only 2 grams, this Micro Cooling Fan utilizes a UL 94V-0 rated PBT thermoplastic frame and impeller for maximum safety and minimal weight. This makes it an exceptional choice for weight-sensitive applications like Tiny Whoop RC drones or portable wearable devices, ensuring your project remains light while adhering to strict fire safety standards. The internal sleeve bearing provides smooth, low-noise operation suitable for quiet indoor environments.

Pro Tip from Our Technicians

To ensure a long lifespan for the sleeve bearing, our Sham Shui Po technical team strongly advises mounting this fan in a vertical orientation rather than horizontally. Sleeve bearings retain their internal lubrication much better when mounted vertically, preventing premature wear and noise. Furthermore, while this fan is rated for 5V, it can also operate at 3.3V with reduced airflow, making it highly versatile for direct connection to 3.3V microcontroller pins.

Technical Specifications

Product Type: DC Brushless Axial Fan
Operating Voltage: 5V DC (Compatible with 3.3V at reduced speed)
Dimensions: 18mm x 18mm x 4mm
Bearing System: Sleeve Bearing
Frame Material: Thermoplastic PBT (UL 94V-0 Fire Retardant)
Impeller Material: Plastic (UL 94V-0 Fire Retardant)
Wiring: 2-Wire (Red Positive +, Black Negative -)
Weight: 2 g
Certifications: CE, RoHS, UR (UL Recognized)

Delivery Options

Local delivery within Hong Kong and in-store pickup.
Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.
Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).
Estimated delivery time: 1–3 business days after dispatch (Hong Kong).
In-store pickup details (location and time) will be confirmed by email or phone message.
Delivery times are estimates and may be affected by weather or unforeseen circumstances.

FAQ Section

Can I power this 18x18x4mm fan using a 3.3V power source?Yes, you can power this fan using a 3.3V source, as indicated by the manufacturer's P&Q performance curve. However, please note that running the fan at 3.3V will result in a lower rotational speed and reduced airflow compared to its optimal 5V rating.
What is the difference between a sleeve bearing and a ball bearing fan?A sleeve bearing fan uses a lubricated sleeve to reduce friction, which makes it quieter at low speeds and more cost-effective, but it has a shorter lifespan if mounted horizontally. A ball bearing fan is noisier and more expensive but can be mounted in any orientation without affecting its lifespan.
Does this fan support PWM speed control or RPM monitoring?No, this specific model is a standard 2-wire fan (red and black wires only), meaning it does not support dedicated PWM signal control or FG (Frequency Generator) RPM monitoring. To adjust its speed, you must lower the input voltage using a buck converter.
Are these micro fans available for immediate pickup in Hong Kong?Yes, these 18x18x4mm 5V micro fans are in-stock for instant pickup at Sun Cheong Computer Co. Ltd. (新昌電腦有限公司) located in Sham Shui Po. Our physical store caters to DIY makers, and you can purchase them in single units or bulk quantities for your projects.
Is this fan suitable for cooling a Raspberry Pi 4?While this fan can operate on the Raspberry Pi's 5V pins, its 18x18mm size is much smaller than the standard 30x30mm or 40x40mm fans typically used for a Raspberry Pi 4. It is better suited for cooling specific, individual microchips or being embedded inside extremely tight custom Pi enclosures.

Target Users / Applications

Micro Drone (Tiny Whoop) Builders: Adding active cooling to overheating VTX (Video Transmitter) modules without adding significant weight.
Wearable Tech Developers: Integrating silent, ultra-thin cooling into smart helmets, VR goggles, or custom cosplay armor.
High-Density PCB Designers: Spot-cooling specific high-temperature ICs or motor drivers inside tightly packed, custom 3D-printed project boxes.

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5V Micro Brushless Cooling Fan 18x18x4mm | Ultra-Thin 2-Wire