Spektrum Firma Smart 40A Brushed ESC with Built In DSMR Receiver

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The Firma 40 amp brushed ESC is the ideal option for 1/10 scale kits and a great upgrade for brushed models. Crawlers and Scalers will love the built-in receiver and will be blown away by the integrated telemetry available with Smart Technology.

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  • Integrated SMART Technology
  • Built-in 4-Channel DSMR® Receiver
  • Waterproof design
  • Dedicated LED power connectors
  • Multiple protection points
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Spektrum Firma Smart 40A Brushed ESC with Built In DSMR Receiver

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Product Information

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

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

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

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.


What's in the Box?

  • (1) Spektrum™ Firma™ 40 Amp Brushed Smart 2-in-1 ESC and Receiver

  • (1) Product Manual


2.1 in (54mm)
Overload Protection
Auto Cutoff
Low-Voltage Cutoff Programmable
1.3 in (33.5mm)
Maximum Burst Current
Smart Technology
0.81 in (20.5mm)
Motor Connector
3.5mm Bullet
DSMR ESC/Receiver
Battery Connector
Input Voltage
6-10.8V (2-3S LiPo, 5-9 cell NiMH)
Antenna Length
1.2 in (31mm)
2.4oz (68g)
BEC Continous Current
2404MHz, 2476MHz
BEC Type
Programmable using optional programmer box (not included)
BEC Voltage
Maximum Continuous Current

Product Manuals

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