Spektrum Firma 85A Smart ESC for surface vehicles is waterproof and delivers power and intelligence all-in-one. Without additional sensors or modules, it feeds battery and ESC telemetry data straight to your radio in real-time, all over one connection. This combo includes a compatible Firma 1900Kv Brushless Sensorless motor.

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 regulating power. They function as 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 RPM, temperature, battery voltage and capacity.

Firma ESCs gather the data and send it to your transmitter in real-time instead of only storing it for an 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!

Waterproof
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.

EC3™/EC5™ Backwards Compatible
Firma™ ESCs feature IC™ series battery connectors. The IC series of connectors are designed from the ground up to provide a more solid connection, higher heat resistance, and effortless installation. When used with an IC3™ or IC5™ connector-equipped Spektrum™ Smart battery, the ESC can receive and transmit battery telemetry data. EC3 and EC5 are also compatible with Firma ESCs for basic operation and ESC telemetry.

One-Wire Telemetry
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 RPM, voltage, temperature, balance, capacity, and speed.

Smart Technology Battery Data
When used with a Spektrum™ Smart LiPo battery, your Firma™ ESC provides you with the benefit of battery telemetry that's automatically transmitted to your compatible Spektrum radio in real-time. You'll be presented with helpful information such as the number of cycles, battery percentage, individual cell voltage, and more!

Multiple Programming Options
Multiple programming options are available. Button programming can be used with nothing more needed. Using the Smart Firma™ ESC Programming Box, you can easily change settings at the track to suit driving conditions. An easy-to-use Smart Link USB Updating and PC Programmer app is also available.

Fast, Powerful M4 Processor
The Firma™ ESCs' 32-bit M4 processor produces higher resolution signal input and more accurate motor output.

Spektrum Smart Technology overview

Spektrum Firma 85A Smart ESC for surface vehicles is waterproof and delivers power and intelligence all-in-one.

Waterproof design

The all-weather, waterproof design of Spektrum Firma Smart ESCs allows them to perform in nearly any terrain under almost any conditions.

IC connector compatibility (EC3/EC5)

Firma ESCs feature IC series battery connectors designed for a more solid connection, higher heat resistance, and effortless installation.

One-wire telemetry connection

With Firma ESCs, simple one-wire telemetry transmits a wide range of data directly to your transmitter in real-time, including RPM, voltage, temperature, balance, capacity, and speed.

Smart Technology battery telemetry data

When used with a Spektrum Smart LiPo battery, your Firma ESC provides battery telemetry automatically transmitted to your compatible Spektrum radio in real-time.

Multiple programming options

Using the Smart Firma ESC Programming Box, you can easily change settings at the track to suit driving conditions.

Fast 32-bit ARM M4 processor

The Firma ESCs' 32-bit M4 processor produces higher resolution signal input and more accurate motor output.

• Smart all-in-one telemetry
• Fast, powerful 32-bit ARM M4 processor
• Waterproof
• Multiple options for easy programming:
  • Button programming
  • Smart ESC Programming Box
  • SmartLink USB Updating and Programmer application
• Multi-point protection:
  • Over-current protection
  • Automatic LiPo low-voltage cutoff
  • Thermal protection
  • Failsafe protection
• Developed and designed by Spektrum™ engineers, in partnership with the industry's leading ESC manufacturer
• Comes bundled with Spektrum Firma 1900Kv Brushless Motor
• Compact for easy installation in most applications
• Ready to install — no soldering required
• Rugged plastic case with mounting tabs
• Aluminium heat sink for high efficiency
• Cooling fan
• Adjustable high-power BEC
• Firmware updatable through the Smart ESC Programming Box
• High heat-resistant IC™ connectors, backwards compatible with EC™ connectors

• 1x Firma 1900Kv Brushless Motor & Smart ESC Combo
• 1x Spektrum Smart Sticker Sheet
• 1x Product Manual