SKU: TH2007
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USB to 2.1mm DC Booster Cable - 9V lets you power compatible 9V equipment directly from a USB source such as a computer, USB charger, or battery pack. It has a built-in boost converter that steps up the USB input to a 9V DC output.
The output uses a 2.1mm DC barrel jack with center-positive polarity, making it suitable for devices designed for 9V input on this common connector style. This is a practical option for small routers, development setups, test gear, and other low-power 9V devices that can run from a boosted USB supply.
Important: this cable is rated for up to 500mA output. Actual performance depends on the quality of the USB power source and cable resistance. At higher loads, USB voltage droop and losses in thin or poor-quality cables can reduce output performance.
Technical details for the USB to 2.1mm DC Booster Cable - 9V.
| Input | USB port |
|---|---|
| Output | 9V DC |
| Output connector | 2.1mm DC barrel jack |
| Polarity | Center-positive |
| Rated output current | 500mA |
| Quiescent current | 3mA |
| Efficiency | About 90% at low current draw, dropping to about 80% at high current use |
| Measured at steady 5V input | 200mA load: 8.9V output, 410mA input, 86% efficiency |
| Measured at steady 5V input | 300mA load: 8.8V output, 620mA input, 85% efficiency |
| Measured at steady 5V input | 500mA load: 8.8V output, 1060mA input, 83% efficiency |
Use this booster cable only with devices that expect 9V DC on a center-positive 2.1mm barrel jack. Always verify voltage, connector size, and polarity before connecting your equipment.
Because boosting 5V to 9V requires higher input current from USB, the source must be able to supply enough current for your load. For example, higher output current can demand over 1A from the USB side.
For best results, use a stable USB power source and a good-quality cable path to minimise voltage drop. This helps maintain output voltage more reliably under load.
It converts power from a USB port to 9V DC through a 2.1mm center-positive barrel plug. It is meant for powering 9V devices that use a center-positive 2.1mm DC jack.
It is intended for devices that need 9V DC input and have a center-positive 2.1mm DC barrel jack. You can use it from a USB source such as a computer USB port or a USB battery pack, as long as the source can supply the needed current.
The cable is rated for up to 500mA output at 9V. At that load, the supplier data shows about 8.8V output with around 1060mA drawn from a steady 5V USB input.
USB input current depends on the 9V load. With a steady 5V input, supplier measurements show about 410mA in at 200mA out, 620mA in at 300mA out, and 1060mA in at 500mA out.
Not always exactly. The supplier measurements show about 9.0V at 50mA, 8.95V at 100mA, 8.9V at 200mA, and around 8.8V at 300mA to 500mA with a steady 5V input.
Yes. Efficiency is about 90% at low current draw and drops to around 80% to 83% at higher current use, and USB voltage droop or thin, high-resistance cables can reduce performance.
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