MAD Motor AMPX 40A Pro (2–6S) Drone BLDC ESC

The MAD Motor AMPX 40A Pro is a standalone BLDC electronic speed controller engineered for commercial multirotors, agricultural UAVs, and endurance builds operating on a 2–6S LiPo voltage range. Built with a dedicated heatsink and high-grade MOSFETs for sustained thermal dissipation, this ESC delivers 40 A continuous output with a 10-second peak burst rating of 50 A to reliably drive high-torque multirotor motors under heavy payloads.

Key features

• Active Freewheeling (DEO): Implements synchronous rectification for higher drive efficiency, cooler operating temperatures, and improved flight time.
• High Burst Capacity: Supports up to 50 A peak current for 10 seconds during aggressive manoeuvres or high-load climbs.
• Twisted-Pair Signal Lead: The throttle signal wire is twisted with the ground wire to reduce electromagnetic crosstalk and interference over long drone arms.
• OPTO Design: Built without an integrated BEC, isolating high-voltage motor circuitry from sensitive flight controller electronics.
• High Refresh Rate Support: Compatible with standard PWM input signals up to 500 Hz for rapid throttle response.

Specifications

• Model / Variant: AMPX 40A Pro (Type B)
• Continuous Current: 40 A
• Peak Current (10s): 50 A
• Input Voltage: 2–6S LiPo (7.4 V – 22.2 V nominal)
• BEC Output: None (OPTO)
• Signal Frequency: Up to 500 Hz PWM

The Type B configuration comes ready for straightforward harness routing on medium-to-large multirotor arms. Because this is an OPTO ESC without a built-in BEC, a dedicated external voltage regulator or standalone BEC is required to power the flight controller and receiver.