T-Motor AT 40A 4S ESC with 5V/3A BEC

The T-Motor AT 40A is a brushless speed controller for fixed-wing aircraft and helicopters running 2–4S LiPo. Its built-in BEC powers the receiver and servos straight from the ESC lead, so most sport models need no separate regulator.

Key features

• Accepts 2S, 3S or 4S LiPo (7.4–14.8 V nominal)

• Protection against abnormal input voltage, low battery voltage, overheating and throttle-signal loss

• Normal, soft and ultra-soft start modes to suit both fixed-wing and helicopter setups

• Programmable throttle range for calibration with any transmitter, plus brake and failsafe functions

• Smooth, linear throttle response up to 210,000 RPM with 2-pole motors

Specifications

• Current rating: 40A

• Input: 2–4S LiPo

• BEC: 5V linear, up to 3A

• Max speed: 210,000 RPM (2-pole), 35,000 RPM (12-pole)

• Start modes: Normal, soft, ultra-soft

A linear BEC turns the difference between pack voltage and 5V into heat, so on 4S keep the servo load light or add a switching BEC for larger servos.