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Custom USB Cable

USB cables are the most widely used external bus standard in the PC sector, not only limited to communication but also focusing on power transmission. Today, USB has developed several variants that can be used to connect devices such as laptops, smartphones, chargers, printers, mobile power, and more.

Romtronic offers custom USB cable products, if you are looking for a quality custom USB cable assembly manufacturer, we will be your best choice!

Our customized USB cables
Our customized USB cables

Our customised USB cable assemblies

Advantages of our customized USB cables

  1. USB fully automatic production equipment, reliable quality, meets high-end customization needs.
  2. Accept small-batch production orders with affordable prices.
  3. Fast delivery, all processes (such as soldering, overmolding and performance testing) are done in-house, usually within 10-15 working days.
  4. We are CE, MFi and USB4 TID certified and offer a variety of connector configurations and cable types.
  5. Sheathing is available in various material options including PVC, silicone, TPE, nylon braid, metal hose, fabric braid and denim to meet any special customization requirements.

You may want to know more about USB cables

USB interface form​
USB interface form​

Type A

They are generally used in personal computers, mainly connected to mobile phones, wireless network cards, USB flash drives, mobile optical drives, small-capacity mobile hard drives, etc.

Type B

Generally used for a 3.5-inch mobile hard drive, printer, and monitor connection.

Type C

Type C is an upgraded version of Type-A and B, oval, support for positive and negative symmetrical plug-in (not divided into positive and negative can be inserted), support for higher power transmission and bi-directional power transmission, the interface is ultra-thin, etc., set of charging, display, data transmission and other functions in one.

With a size of about 8.3mm x 2.5mm, it is gradually replacing the Micro USB connector. The highlights of Type C, which appeared after USB 3.1, are thinner and lighter design, faster transmission speed (up to 10Gbps), and stronger transmission power (up to 100W). It solves the worldwide problem of USB never plugging in.

Mini USB

They are generally used for mobile devices such as digital cameras, digital camcorders, measuring instruments, and portable hard drives.

Micro USB

Compared with Mini USB, it is smaller and thinner, and many mobile devices including tablets, mobile hard drives, digital cameras, and camcorders have eliminated Mini USB ports and replaced them with Micro USB.

USB (Universal Serial Bus) is a standard interface for connecting and transferring data. The current major USB standards are USB 1.1, USB 2.0, USB 3.2 Gen 1 USB 1.1, USB 2.0, USB 3.2 Gen 1 USB 3.2 Gen 2, USB 3.2 Gen 2×2, USB4, and USB4 2.0.

USB 1.1

This is one of the older USB standards where devices can achieve a maximum transfer rate of 12 Mbps and is known as Full Speed USB.

USB 2.0

USB 2.0-compliant devices can achieve transfer rates of up to 480 Mbps. This standard is known as Hi-Speed USB.

USB 3.2 Gen 1

Previously known as USB 3.0, compatible hardware can reach a maximum transfer rate of 5 Gbps (5,120 Mbps) and is known as SuperSpeed USB.

USB 3.2 Gen 2

Formerly known as the USB 3.1 standard, compatible devices can transfer data at speeds up to 10 Gbps (10,240 Mbps).
This standard is also known as Superspeed+.

USB 3.2 Gen 2×2

Also known as USB 3.2, allows compatible devices to transfer data at 20 Gbps (20,480 Mbps) and is known as Superspeed+ USB Dual Channel.


Based on the Thunderbolt 3 specification, the USB4 standard supports transfer speeds of up to 40 Gbps (40,960 Mbps).
It is the later generation USB4 2.0 base but with slightly lower speeds.

USB4 2.0

This is the latest version of the USB4 standard, released in October 2022. USB4 2.0 supports transfer speeds of up to 80 Gbps (81,920 Mbps).

These ongoing developments and updates to USB standards have resulted in faster data transfer speeds and more stable connections, providing better interconnectivity for a wide range of devices.

Plug and Play

Users can easily install and uninstall external devices.

Multi-Device Connectivity

USB has powerful connectivity allowing up to 127 devices to be connected to the same system.

Standardised design

All USB devices use the same plug and socket, simplifying the installation process.


USB devices are manufactured in a simple process and the intelligence is located within the host computer, reducing manufacturing costs.

No.Parameter MeasuredTest ConditionsRecommended Specifications
1Differential ImpedanceTDR Measurement
500ps Risetime
90 Ohm±15%
2Common Mode ImpedanceTDR Measurement
500ps Risetime
30 Oh±30%
3Propagation DelayTDR Measurement
500ps Risetime
4SkewTDR Measurement
500ps Risetime
100ps/cable (max)
5AttenuationNA S21 Measurement
0 dBm Power
401 Points
300Hz IF BW
-0.13 dB/cable@0.512MHz
-0.15 dB/cable@0.772MHz
-0.20 dB/cable@1MHz
-0.39 dB/cable@4MHz
-0.57 dB/cable@8MHz
-0.76 dB/cable@12MHz
-0.95 dB/cable@24MHz
-1.35 dB/cable@48MHz
-1.90 dB/cable@96MHz
-3.2 dB/cable@200MHz
-5.8 dB/cable@400MHz

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