MAD Motor AMPX 40A Pro (2–6S) 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 burst rating of 60 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 60 A burst current 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: Handles throttle signal rates above 600 Hz for rapid throttle response.

Specifications

• Versions: Type A (75 mm input and output leads, 110 mm signal lead) or Type B (250 mm input and signal leads, 3.5 mm gold bullet connectors)
• Continuous Current: 40 A
• Burst Current: 60 A
• Input Voltage: 2–6S LiPo (7.4 V – 22.2 V nominal)
• Dimensions: 64.3 x 19.6 x 8.9 mm
• BEC Output: None (OPTO)
• Signal Frequency: 600 Hz and above

Type A's short leads suit compact layouts, while Type B's long pre-terminated leads suit 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.