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The Spektrum Firma 40 amp Brushed Smart ESC is waterproof and ready to use in most 1/10th scale RC models. Featuring programming options that make it easy to tune for your on-road and off-road racers, scalers, crawlers, and bashers.
Like every component in the Spektrum™ Smart ecosystem, Firma™ Smart ESCs combine "plug-and-play" simplicity with the ability to communicate with other Smart electronics — together, creating the best-performing RC system for your vehicle imaginable.
Firma Smart ESCs do much more than regulate power. They function like a virtual engineer inside your model, providing a direct path to the vital operating data you need to reach peak performance. Firma Smart ESCs give you an extra layer of confidence that your electronics are all operating at their best.
With Firma Smart ESCs, you'll be better connected to your vehicle than ever before — without installing extra components that all work independently of each other. You won't need extra wires, modules, or links. A Firma electronic speed control provides a one-wire solution for obtaining telemetry data such as motor current, temperature, battery voltage and capacity.
Firma ESCs not only gather the data but also send it to your transmitter in real time, instead of only storing it for after-run study. You're able to adjust settings as needed to boost performance on the go. The Firma Smart single-wire telemetry solution has been tested for quality and performance by the best brands in RC. Their verdict? Smart technology is both simpler and superior!
*Please see manual for Waterproof Usage Guidelines
**See compatibility chart for more information.
The Spektrum Firma 40 amp Brushed Smart ESC features a huge range of drag brake adjustability, allowing for drivers to expertly tune their models depending on their driven train and vehicle weight. Featuring fine levels of adjustability for Drag Brake Percentage and Drag Brake Rate that is perfect for tuning your crawlers and scalers for expert level rock crawling performance.
The all-weather, waterproof design of Spektrum™ Firma™ Smart ESCs allows them to perform in nearly any terrain under almost any conditions. Firma ESCs keep you going through dust, gravel, snow, and water.
Multiple programming options are available. Using the Smart Firma™ ESC Programming Box, you can easily change settings on the trail to suit driving conditions. An easy-to-use Smart Link USB Updating and PC Programmer app is also available. And for those with a Text Gen capable, programming and adjustment of ESC settings can be performed, right from your Spektrum transmitter, no additional modules or wires needed!
No need to connect multiple wires, sensors, modules, and links. With Firma™ ESCs, simple one-wire telemetry transmits a wide range of data directly to your transmitter in real time, including voltage, temperature, and motor current.*
| Product Weight | 1.69 oz (48 g) |
|---|---|
| Product Length | 1.41" (36 mm) |
| Product Width | 1.18" (30 mm) |
| Product Height | 0.71" (18 mm) |
| Connector Type | 4mm Bullet, IC3 |
| Amperage | 40A |
| Auto Cutoff | Yes |
| BEC | Yes |
| BEC Continuous Current | 4A (Shared Between Receiver and Aux Light Outputs) |
| BEC Voltage | 6V / 7.4V User Selectable |
| Forward | Yes |
| Input Voltage | 2–3 Cell Li-Po / Li-Fe; 5–9 Cell Ni-MH / Ni-Cd |
| Low-Voltage Cutoff Programmable | Yes |
| Maximum Burst Current | 160A |
| Maximum Continuous Current | 40A |
| Motor Limit | 540 / 550 Size Motors |
| Motor Type | Brushed |
| Product Application | Crawling, Surface |
| Programmable | Yes |
| Reverse | Yes |
| Technology | Smart |
| Turns | Below 8.4V; Down to 12T / Below 12.6V; Down to 35T |
| Water-Resistant | Yes |
This replacement part is used in the following complete models.
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