Spektrum Firma 40 Amp Brushed Smart 2-in-1 ESC and Receiver SPMXSE1040RX

Spektrum Firma 40 Amp Brushed Smart 2-in-1 ESC and Receiver SPMXSE1040RX
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Upgrade your brushed motor equipped models to Spektrum Smart Technology with the Firma Smart 40 Amp Brushed ESC. Get valuable battery and ESC telemetry data easily and in real time right on your Smart-compatible Spektrum transmitter — including motor current, input voltage, remaining battery capacity and other information that will help endurance RC trailers increase efficiency and extend battery life and run time.

Built with Crawler and Scaler models in mind, the Firma 40 Amp Brushed ESC features a waterproof and dust proof design to keep you going down the trail in nearly any conditions. It has a powerful 3 amp BEC for your lights, winch and steering servo. And it’s fully programmable using an optional programmer box, so you can customize the ESC to suit your model’s needs and your own driving style.

The Firma 40 Amp Brushed ESC also helps reduce clutter and streamline your setup with an industry-leading, integrated 4-channel DSMR/DSM2 receiver. This integrated receiver system is perfectly suited to allow drivers the options for winch setups, dual steering mixes and more. And setup is simple, with a convenient bind button and no complicated calibrations. When using Smart telemetry, alarms and parameters are setup automatically on your Spektrum transmitter.


  • Integrated SMART Technology
  • Built-in 4-Channel DSMR Receiver
  • Waterproof design
  • Dedicated LED power connectors
  • Multiple protection points


  • Length: 2.1 in (54mm)
  • Overload Protection: yes
  • Auto Cutoff: Yes
  • Low-Voltage Cutoff Programmable: Yes
  • Reverse: Yes
  • Width: 1.3 in (33.5mm)
  • Maximum Burst Current: 180A
  • Technology : Smart Technology
  • Height: 0.81 in (20.5mm)
  • Forward: Yes
  • Motor Connector: 3.5mm Bullet
  • Type: DSMR ESC/Receiver
  • Battery Connector: IC3
  • Input Voltage: 6-10.8V (2-3S LiPo, 5-9 cell NiMH)
  • Antenna Length: 1.2 in (31mm)
  • BEC: Yes
  • Weight: 2.4oz (68g)
  • BEC Continous Current: 3A
  • Band: 2404MHz, 2476MHz
  • Brakes: Yes
  • BEC Type: Programmable using optional programmer box (not included)
  • BEC Voltage: 6V
  • Channels: 4
  • Maximum Continuous Current: 40A
What's in the Box?
  • (1) Spektrum Firma 40 Amp Brushed Smart 2-in-1 ESC and Receiver
  • (1) Product Manual

Integrated Smart Technology

The Firma Smart 40 Amp Brushed ESC is ready to transmit valuable telemetry data using the latest advances in connectivity with Spektrum Smart Technology. Smart Technology ensures that all of your vehicle’s electronics work together for the greatest efficiency and performance. It keeps you aware of every component’s status and boosts your confidence in its capabilities, with no additional sensors or wires required.

Telemetry Data Shown with Firma 40 Amp Brushed ESC:
    • Smart Battery Data
    • Cell Voltage and Balance
    • Battery Cycle Count
    • Battery Temperature
    • Capacity Used and Percent Remaining
ESC Data
  • Motor Current
  • ESC Temperature
  • Input Voltage



Built-in 4-Channel DSMR/DSM2 Receiver

Integrated into the Firma Smart 40 Amp Brushed ESC is an exceptionally responsive and reliable, 4-channel DSMR/DSM2 surface receiver. Powered by the built-in 3 amp 6 volt BEC, it provides ample power for your servos, winches, lights and other accessories. Binding is easy, thanks to the easy-access bind button and simple setup with no complicated calibrations needed.



Waterproof Design

The all-weather, waterproof design of Spektrum Firma Smart ESCs allows them to perform in nearly any terrain under almost any conditions. This extends to the built-in 4-channel receiver, keeping you going through dust, gravel, snow, and water.



Extensive Programming Parameters

From Low Voltage Cutoff to Throttle Punch settings and everything in-between, the Firma Smart 40 Amp Brushed ESC can be tuned for your model’s needs and your personal driving style. To adjust these parameters, all you need is the user-friendly Dynamite® LED Program Card (DYNS3005). The Program Card includes everything you need to program your Firma 40 Amp Brushed ESC. It has a simple-to-read LED display and a helpful programming legend on its face to assist with programming while you’re on the trail.

This product was added to our catalog on June 15, 2020