USB Products

A reliable USB product is the lifeline of modern connectivity and power delivery. Whether you need a 240W USB-C PD cable for your laptop, a FNIRSI USB tester to diagnose charging faults, or a high-speed USB 3.2 hub for your workstation, we have the exact hardware. Backed by 20 years of electronic retail experience, Sun Cheong Computer (新昌電腦) provides on-site voltage testing and protocol verification in Sham Shui Po to ensure your USB accessories deliver safe, bottleneck-free performance.

USB Connectivity & Diagnostic Specifications

Selecting the correct USB hardware goes beyond matching the port shape; it requires understanding power protocols and data bandwidth. Here is a technical breakdown of our core USB inventory:

Product Category Key Technical Specifications Best Use Case
USB Testers & Analyzers Real-time V/A/W display, PD/QC protocol detection Diagnosing bad cables, verifying charger output, and checking battery health.
High-Wattage PD Cables 100W / 240W (5A) capacity, Built-in E-Marker Chips Safely fast-charging laptops, smartphones, and high-drain power banks.
USB Hubs & Splitters USB 3.0 / 3.2 Gen 2 (10Gbps+), Active Power support Expanding laptop ports for external SSDs, peripherals, and card readers.
Industrial USB Converters USB to RS232/TTL, Genuine FTDI/CH340 chipsets Connecting modern PCs to legacy CNC machines, PLCs, or microcontrollers.

Important Note (Data Speed Limitations & Power Hazards): A USB-C cable marketed for "240W Fast Charging" does not guarantee fast data transfer. Most high-wattage charging cables only support USB 2.0 data speeds (480Mbps) because they prioritize thicker power wires over data lines. If you need to transfer 4K video to an external SSD, you must specifically purchase a USB 3.2 (10Gbps) or USB4 (40Gbps) data cable. Furthermore, unpowered USB hubs cannot drive multiple high-power devices (like external mechanical hard drives); doing so will cause the voltage to drop, resulting in random disconnects and potential data corruption.

Frequently Asked Questions (FAQ)

Q: Why is my phone charging slowly even though I bought a 100W charger?
A: Fast charging requires a complete "handshake" between the charger, the cable, and the device. If you use a cheap USB-C cable without an internal E-Marker chip, the charger's safety mechanism will restrict the output to a maximum of 60W (3A) or lower. A USB Tester can instantly reveal if your cable is the bottleneck preventing maximum charging speeds.

Q: Can I plug a USB-C to HDMI adapter into any USB-C port on my laptop to add a monitor?
A: No. Your laptop's USB-C port must specifically support DisplayPort Alternate Mode (DP Alt Mode) or Thunderbolt. If your USB-C port is wired only for data transfer and charging (which is common on budget laptops), no video adapter will work. Always check your laptop's official specifications before purchasing display adapters.