FingerTech 5V 4A UBEC
The FingerTech 5V 4A UBEC keeps your receiver powered when your ESCs don’t supply a 5V return line. Running brushless drive ESCs without a built-in BEC — like the BL40A AM32 — means your receiver needs power from somewhere else. This compact switching regulator steps down any 2S–6S LiPo to a steady 5V at up to 4A, keeping your radio link solid under combat conditions. Sold individually.
$7.25
9 in stock (can be backordered)
FingerTech 5V 4A UBEC
The FingerTech 5V 4A UBEC is a compact switching regulator that steps down any 2S–6S LiPo to a clean, stable 5V at up to 4A. If you’re running brushless drive ESCs that don’t have a built-in BEC — like the BL40A AM32 — there’s no 5V return line feeding your receiver. This UBEC fills that gap, wiring directly from your battery to your receiver to keep your radio link solid no matter what’s happening on the drive side.
Switching Regulator — Not Linear
This is a switching regulator, not a linear one. Linear regulators burn off excess voltage as heat — inefficient and bulky. This UBEC converts the excess efficiently, running cooler and drawing less from your battery. At 6.3g and the same footprint as the 9.6V version, it adds almost nothing to your build.
Wiring It Up
Hook up the UBEC’s IN+/− wires to your battery after your power switch. Plug the black output connector into your receiver. If any of your ESCs have built-in BECs, pull the center red wire from those connectors — you don’t want multiple voltage sources fighting over your receiver’s power rail. One source, clean power.
Which UBEC Do I Need?
This is the UBEC for receiver power. If you’re also running a 9V-rated servo — like the FingerTech 9V digital servo — on a 3S or higher battery, you’ll need the 9.6V 4A Switching UBEC for that servo separately. Standard servos rated 4.8–6.8V do not need a UBEC when running on 2S.
Sold individually. Includes a 20cm (7.9in) servo wire.
Features
- Clean 5V output — steady regulated power for your receiver on any 2S–6S LiPo
- Up to 4A output — more than enough headroom for any receiver setup
- Switching regulator — efficient conversion, not burning off excess voltage as heat
- Wide input range — works from 6V to 23V, covering 2S through 6S LiPo
- Lightweight — 6.3g adds almost nothing to your weight budget
- 20cm servo wire included — plugs directly into your receiver, no extra wiring needed
Specifications
| Specification | Value |
|---|---|
| Length | 1.50in (38.0mm) |
| Width | 0.45in (11.4mm) |
| Height | 0.40in (10.2mm) |
| Weight | 0.22oz (6.3g) |
| Input Voltage | 6V–23V (2S–6S LiPo) |
| Output Voltage | 5V |
| Output Current (max) | 4A |
| Servo Wire Length | 7.90in (20.0cm) |
UBEC Comparison
| Specification | 5V 4A UBEC | 9.6V 4A UBEC |
|---|---|---|
| Output Voltage | 5V | 9.6V |
| Output Current (max) | 4A | 4A |
| Input Voltage | 6V–23V (2S–6S) | 10.8V–23V (3S–6S) |
| Use Case | Receiver power | High Voltage Servo power only — do not use for receivers or standard voltage servos |
| Weight | 0.22oz (6.3g) | 0.22oz (6.3g) |
| Dimensions | 1.50 × 0.45 × 0.40in | 1.50 × 0.45 × 0.40in |
Frequently Asked Questions
What is a UBEC?
UBEC stands for Universal Battery Elimination Circuit. It's a switching voltage regulator that takes in your full battery voltage and outputs a clean, stable lower voltage to power your receiver or servos. The name comes from RC aircraft, where it replaced the need for a separate receiver battery.
Why do I need a UBEC if my ESC already has a BEC?
Many brushless ESCs — including the BL40A AM32 — have no built-in Battery Elimination Circuit (BEC) and provide no 5V return line to the receiver. If that's your setup, your receiver has no power source without a dedicated UBEC. Even if some of your ESCs do have BECs, you should only run one voltage source to your receiver — pull the center red wire from any ESC BECs you're not using.
Can I use the 9.6V UBEC for my receiver instead?
No — the 9.6V UBEC is for 9V-rated servos only. Standard receivers operate at 4.5–6.5V. Feeding 9.6V to a receiver will damage it. Use this 5V UBEC for receiver power.
How do I wire it up?
Run the UBEC's IN+/− wires to your battery after your power switch. Plug the black output connector into your receiver. If any of your ESCs have built-in BECs, pull the center red wire from those connectors — you don't want multiple voltage sources on your receiver's power rail.
Does this work with the NightWing kit?
Yes — the FingerTech NightWing uses the BL40A AM32 ESCs for both drive and weapon, neither of which supply 5V to the receiver. This UBEC is the correct solution for powering the receiver in a NightWing build.
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