Hobbywing 5A UBEC V2 Air 5V/6V/7.4V External Switching BEC for 2-8S LiPo

The Hobbywing 5A UBEC V2 Air 5V/6V/7.4V External Switching BEC for 2-8S LiPo is an external switch-mode DC voltage regulator designed to provide stable power for receivers, servos, gyros, and other onboard electronics in RC aircraft and custom RC models. It takes power from a 2S to 8S LiPo battery and converts it into a safe receiver-side output voltage.

This UBEC uses an efficient DC-DC regulator chip with a conversion efficiency of more than 90%. Compared with a traditional linear BEC, the switching design helps reduce wasted heat and is better suited for higher-voltage RC power systems.

With 5.0V, 6.0V, and 7.4V adjustable output, 5A continuous current, 15A instantaneous current, overcurrent protection, output short-circuit protection, and overheat protection, this Hobbywing UBEC is a practical external BEC upgrade for fixed-wing aircraft, OPTO ESC setups, and servo-heavy RC builds.

Product Specifications

Key Features

• 5A external UBEC: Provides stable receiver and servo power for RC aircraft and other models that need a separate BEC solution.
• 2-8S LiPo input: Supports a wide input range for medium and larger RC power systems.
• 5.0V / 6.0V / 7.4V adjustable output: Three voltage options make it suitable for different receiver, servo, and HV servo setups.
• 15A instantaneous current: Helps handle short current spikes from servo movement and receiver-side load changes.
• High-efficiency DC-DC regulator: Conversion efficiency of more than 90% helps reduce heat compared with traditional linear BEC designs.
• Protection design: Includes overcurrent protection, output short-circuit protection, and overheat protection.
• Metal shield structure: Helps with heat dissipation and reduces electromagnetic interference.
• LED status indicator: The red LED indicates whether the UBEC is outputting normal voltage.

When Should You Use This Hobbywing 5A UBEC?

Use this Hobbywing 5A UBEC when your aircraft or RC model needs stronger and more stable receiver power than the ESC’s built-in BEC can provide. It is especially useful for fixed-wing aircraft with multiple servos, higher-voltage LiPo systems, OPTO ESC setups, or models using compatible HV servos.

For larger aircraft or servo-heavy setups, relying only on a small internal BEC may create heat or voltage stability issues. A dedicated external switching BEC helps separate receiver and servo power from motor control, giving the electronics a more reliable power path.

Output Voltage Notes

• 5.0V output: Suitable for many standard receiver and servo setups.
• 6.0V output: Suitable for receivers and servos that support 6V operation.
• 7.4V output: Suitable only for compatible HV receivers and HV servos.
• Important: When using 7.4V output, 3S LiPo or higher input is recommended for more stable output. With 2S LiPo, the UBEC may not maintain stable 7.4V output as battery voltage drops.

Installation Notes

• Connect the UBEC input wires in parallel with the main battery power supply.
• Plug the UBEC output lead into an idle receiver channel or receiver power input port.
• If your brushless ESC has no built-in BEC, no ESC-side BEC change is required.
• If your brushless ESC already has a built-in BEC, disconnect the ESC’s BEC output before using this external UBEC.
• Keep the UBEC more than 5cm away from the receiver to reduce possible electromagnetic interference.
• Always check your receiver and servo voltage ratings before selecting 5.0V, 6.0V, or 7.4V output.

User Manual

For wiring diagrams, voltage adjustment instructions, safety notes, and setup guidance, please refer to the official Hobbywing 5A UBEC user manual.

Recommended Applications

• RC fixed-wing aircraft using 2S to 8S LiPo power systems
• Airplanes with multiple servos or higher receiver-side power demand
• OPTO ESC systems that require a separate BEC
• HV servo setups that support 7.4V receiver power
• Custom RC aircraft builds where stable external BEC power is required

For more ESC and power-system options, explore our Hobbywing ESCs, ESC Programmers & Accessories, and External BEC & UBEC collections.

FAQ

What is the Hobbywing 5A UBEC V2 Air used for?

It is used to provide stable power to the receiver, servos, gyro, and other onboard electronics. It is useful when the ESC has no built-in BEC, when the internal BEC is not strong enough, or when a separate receiver-power solution is preferred.

Can this UBEC be used with an 8S LiPo battery?

Yes. This Hobbywing 5A UBEC supports 2-8S LiPo input, making it suitable for many medium and larger RC aircraft power systems.

Should I use 5V, 6V, or 7.4V output?

Use 5V for standard receiver and servo systems, 6V for electronics that support 6V operation, and 7.4V only for compatible HV receivers and HV servos. Always check your electronics specifications before changing the output voltage.

Can I use 7.4V output with a 2S LiPo battery?

It is not recommended if you need stable 7.4V output. As the 2S LiPo voltage drops during use, the UBEC may not be able to maintain a stable 7.4V output. For 7.4V output, 3S LiPo or higher input is recommended.

Do I need to disable the ESC’s built-in BEC?

Yes, if your ESC already has a built-in BEC and you want this external UBEC to power the receiver, the ESC’s BEC output should be disconnected first. This avoids powering the receiver from two BEC outputs at the same time.

Is this product an ESC?

No. This product is not an ESC and does not control the motor. It is an external switching BEC used to power the receiver, servos, gyro, and other low-voltage electronics.

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