Spektrum 150A Smart ESC / 2050Kv Sensorless Motor Combo SPMXSEMC05

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Spektrum 150A Smart ESC / 2050Kv Sensorless Motor Combo SPMXSEMC05
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Price: $219.99

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Product Features

  • 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 2050Kv Brushless Motor
  • Compact for easy installation in most applications
  • Ready to install — no soldering required
  • Rugged plastic case with mounting tabs
  • Aluminum 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
  • Limited 1-year warranty

Product Overview

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 RPM, 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!

This ESC comes bundled with a Spektrum Firma 2050Kv Brushless Motor capable of handling everything this ESC can put out that is a perfect to get you driving with Spektrum Smart technology.


  • BEC Voltage: 6V
  • Reverse: Yes
  • Programmable: Yes
  • Length: 2.3" (58mm), ESC
  • Motor Connector: 4mm Bullet
  • Input Voltage: 3S - 6LiPo
  • Motor Output Lead: 5.9" (150mm) 10AWG
  • Weight: 8.4oz (238g), ESC
  • Width: 1.9" (47.5mm) without tabs, 2.3" (59.5mm) with tabs, ESC
  • Output: 3000W
  • BEC Type: Linear
  • Height: 1.5" (38.5mm), ESC
  • Forward: Yes
  • RPM/Volt (Kv): 2050Kv
  • Maximum Burst Current: 950A
  • Maximum Continuous Current: 150A
  • Auto Cutoff: Yes
  • Battery Input Lead: IC5, EC5 compatible
  • BEC: Yes
  • Low-Voltage Cutoff Programmable: Yes
  • BEC Continous Current: 5A
  • Battery Connector: IC5
  • Brakes: Yes
  • Overload Protection: Yes
Needed to Complete
  • Spektrum Surface Receiver
  • Spektrum Smart Technology LiPo Battery
  • Spektrum Transmitter
What's in the Box?
  • (1) Spektrum Firma Smart ESC
  • (1) Spektrum Firma 2050Kv Brushless Motor
  • (1) Spektrum Smart sticker sheet
  • (1) Product Manual


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.




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.




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.*

*See compatibility chart for more information.




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. On your transmitter screen you'll be presented with helpful information such as number of cycles, battery percentage, individual cell voltage and more!




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.




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

This product was added to our catalog on June 29, 2020

Andrzej Kiliszek
Verified Owner
Tuesday, Aug 17 2021 (about 2 years ago)
Spektrum RC Firma 150 Amp Sensorless Brushless Smart ESC & Motor Combo (2050Kv)
In what appears to be typical for Spektrum, I was unable to access the features described in their Quick Hit Tech Tips. There are two tables of options for the ESC on line. One has eight lines, the other 11. I spent a great deal of time messing around with button programming before I finally gave up and called tech support. They informed me that I can't get there from here because of my out of date firmware and software, and advised me to buy a programmer card. I did, and got into another mess with broken links and old updates for the card USB link, and the ESC. Another call to tech support got me to the latest updates. Sadly, it did not resolve the problem of missing programmable feature on the ESC. There are two sets of specs for the 150A Smart ESC, and mine just wasn't as smart. It turns out that three options may have been dropped. Tech support is following up with Spektrum to see if eliminating the features was a design "upgrade." Main thing that's missing is the ability to set the LVC voltage, which was my only reason for buying the programmer. Push button programming works fine as long as you have the correct table. Having the table be part of the paper manual would have been nice, not having a table on line with three options that no longer exist would have been nice too. In a nut shell, printed Spektrum documentation, and documentation on line are a mess. Tech support was good, other than misleading me into buying a programmed that did not solve the problem. The difference in tables of features were news to them too. Other than taking my battery down below 3V one time, the ESC works OK. No problems with the motor, works as it should.