Features
- Smart all-in-one telemetry
- Dual Protocol – compatible with SLT and DSMR Protocols transmitters
- 25 Amp continuous power / 70A burst – ideal for 1/16th mini and micro vehicles
- 2-3S LiPo Compatible
- 5-9Cell NiMH Compatible
- Waterproof Design
- Multiple Protection points
- Various Programming Options
- Programming from Transmitter via Text Gen Telemetry
- Smart ESC Programming Box
- Push Button
- Compact for easy installation
- Ready to install – no soldering required
- Firmware updatable
Overview
Upgrade your brushed motor equipped models to Spektrum Smart Technology with the Firma Smart 25A Brushed ESC + Dual Protocol Receiver. 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 a wide variety of RC drivers increase and extend battery life, and run time.
Overview
The Spektrum Firma 25A 2-in-1 Brushed Smart ESC with Dual Protocol Receiver represents a significant upgrade for RC enthusiasts looking to modernise their brushed motor-equipped models with intelligent telemetry and advanced wireless technology. This all-in-one electronic speed controller and receiver combination brings Spektrum Smart Technology to 1/16th scale mini and micro RC vehicles, delivering real-time performance data directly to your transmitter. Whether you're piloting a compact RC car or exploring the world of ready to run RC models in the UK market, this system offers the connectivity and intelligence that serious hobbyists demand.
As a 2-in-1 integrated unit, the Firma 25A eliminates the need for separate receiver and ESC components, dramatically reducing wiring complexity and saving valuable space in compact RC chassis. This makes it an ideal choice for owners of small-scale brushed motor vehicles who want to enjoy the benefits of Smart Technology without the installation headaches typically associated with traditional setups. The waterproof design ensures this ESC and receiver combination can handle the demands of outdoor RC driving in virtually any weather condition, whether you're tackling wet grass, muddy terrain, or dusty tracks across the UK.
Built by Spektrum, a recognised leader in RC wireless systems and electronics, the Firma 25A brings professional-grade performance to the budget-conscious RC car enthusiast. With dual protocol compatibility and extensive programmable options, this brushed ESC gives you the flexibility to match your driving style and vehicle setup perfectly.
Key Features
- Smart All-in-One Telemetry — This ESC continuously monitors critical performance metrics including motor current draw, input voltage, and remaining battery capacity, transmitting this data wirelessly to your Spektrum transmitter in real-time, allowing you to make informed decisions about battery management and driving performance throughout your session.
- Dual Protocol Compatibility — The receiver supports both DSMR and SLT protocol transmitters, as well as the legacy DSM2 protocol, meaning you can use this ESC and receiver combination with a wide range of existing Spektrum surface transmitters, protecting your investment if you upgrade vehicles in the future.
- 25 Amp Continuous Power with 70 Amp Burst Capability — The ESC delivers robust 25 amperes of continuous current handling with the ability to handle temporary power spikes up to 70 amps, making it perfectly suited for the demands of 1/16th scale mini and micro RC vehicles whilst maintaining reliability during aggressive acceleration and hill climbing.
- 2-3S LiPo and 5-9 Cell NiMH Battery Compatibility — This versatile brushed ESC works seamlessly with either modern LiPo batteries in 2-cell or 3-cell configurations, or traditional NiMH battery packs ranging from 5 to 9 cells, giving you flexibility in choosing your power source based on your budget and driving preferences.
- Waterproof Design — The all-weather waterproof construction of this brushed Smart ESC allows it to perform reliably in nearly any terrain and weather condition, protecting your electronics from water splash, mud, and moisture that are inevitable during outdoor RC driving sessions.
- Multiple Programming Options — You can customise ESC settings using three different methods: through the optional Smart Firma ESC Programming Box for detailed configuration, directly from your Text Gen capable Spektrum transmitter for convenient on-the-fly adjustments, or through push button programming for basic settings.
- No Soldering Required Installation — The Firma 25A features ready-to-install connectors with 4mm female bullet connectors for motor output, streamlining the setup process and making it accessible to RC hobbyists of all skill levels without requiring soldering skills or equipment.
- 6V 1.5A Built-in BEC — The integrated Battery Eliminator Circuit provides 6 volts at up to 1.5 amps of continuous current, sufficient to power servo and receiver components without requiring a separate BEC module or external power source.
- Compact Form Factor — The space-saving design of this 2-in-1 integrated unit fits easily into confined chassis spaces typical of 1/16th scale mini and micro RC vehicles, eliminating the installation challenges associated with fitting separate receiver and ESC units.
- Firmware Updatable — Spektrum provides periodic firmware updates to enhance performance and add new features, and this ESC's firmware is updatable, ensuring your electronics can benefit from improvements released after your purchase.
- Reverse Capability — The ESC includes programmable reverse function, allowing you to operate your brushed motor in both forward and reverse directions as needed for your driving style and vehicle setup.
- Overload Protection — Built-in protection circuitry guards against short circuits and electrical faults, safeguarding both the ESC itself and your motor and battery from damage caused by accidental wire contact or excessive current draw.
- Auto Cutoff Function — The intelligent auto-cutoff protection monitors your battery voltage and automatically reduces ESC output if the battery drops below safe operating levels, preventing over-discharge damage to your LiPo or NiMH battery pack.
Technical Performance
The Spektrum Firma 25A 2-in-1 Brushed Smart ESC represents a thoughtfully engineered solution for small-scale RC vehicles, delivering reliable performance in a compact package. With its 25-amp continuous current rating and impressive 70-amp burst capability, this brushed ESC provides the headroom necessary for responsive acceleration and sustained high-power driving in 1/16th scale mini and micro RC cars. The integration of receiver and ESC into a single unit eliminates the redundancy and complexity of traditional separate components whilst maintaining full Smart Technology functionality. The waterproof design utilises modern materials and conformal coating techniques to protect vulnerable electronics from water ingress, whilst still allowing heat dissipation necessary for reliable operation during extended driving sessions. Compatibility with both 2-3S LiPo batteries and 5-9 cell NiMH packs ensures this ESC works with virtually any power source available to UK RC enthusiasts, whether you prefer the high discharge rate and compact size of LiPo batteries or the ruggedness and affordability of traditional NiMH technology. The 6V 1.5A BEC output is appropriately rated for the modest power requirements of servo and receiver components in small-scale vehicles. Multiple programming options accommodate different user preferences, from those seeking quick setup via push buttons to advanced users wanting granular control through dedicated programming boxes or transmitter interfaces. The firmware updateability ensures this electronics package can receive improvements and bug fixes throughout its operational life, protecting your investment and maintaining compatibility with future Spektrum system enhancements.
What's in the Box
- Firma 25A 2-in-1 Dual Protocol Brushed Smart ESC and Receiver
- Product manual in multiple languages (English, German, French, Italian)
What You Need to Complete
- Spektrum Surface Transmitter compatible with SLT or DSMR protocols (DSM2 also supported)
- 2S or 3S LiPo battery with IC2 connector, OR 5-9 cell NiMH battery pack
- 180-390 size brushed motor with appropriate power rating for your application
Frequently Asked Questions
- Is the Spektrum Firma 25A suitable for beginners to RC hobbies? — Yes, this ESC is excellent for beginners because the 2-in-1 design eliminates the complexity of integrating separate receiver and ESC units, and the no-soldering-required installation makes setup straightforward. The push button programming option provides an easy entry point into ESC customisation, whilst the telemetry features actually help new drivers learn good battery management practices by showing real-time power consumption data.
- What batteries does the Firma 25A require? — This ESC supports two battery types: 2S or 3S LiPo batteries with IC2 connectors, offering high discharge rates and compact size ideal for mini RC vehicles, or traditional 5-9 cell NiMH battery packs for those preferring conventional chemistry. The auto-cutoff protection prevents over-discharge damage to either type, and the Smart telemetry monitors remaining capacity throughout your driving session.
- How much continuous power does this brushed ESC deliver? — The Firma 25A is rated for 25 amps of continuous current output with a 70-amp burst capability, making it well-suited for 1/16th scale mini and micro RC vehicles equipped with appropriately sized brushed motors in the 180-390 size range. This power rating provides responsive acceleration and sustained high-power running without thermal throttling during normal driving conditions.
- What wireless protocols does this ESC support? — This is a dual protocol unit supporting both DSMR and SLT protocols with modern Spektrum transmitters, and it also maintains compatibility with legacy DSM2 protocol systems, ensuring broad compatibility with existing Spektrum radio equipment across the UK RC hobby community.
- Can I update the firmware on this ESC? — Yes, the Firma 25A features updatable firmware, allowing you to benefit from performance improvements and bug fixes released by Spektrum after your purchase. Firmware updates ensure compatibility with future Spektrum products and can add new features as the Smart Technology ecosystem evolves.
- How does the Smart telemetry actually work? — The ESC continuously measures motor current, battery input voltage, and estimates remaining battery capacity, transmitting this data wirelessly to your Spektrum Smart-compatible transmitter where it displays on the transmitter's screen. This real-time feedback helps you optimise battery life, avoid over-discharge damage, and understand how driving style affects power consumption across an entire session.
- Is this waterproof ESC suitable for wet weather RC driving? — The all-weather waterproof design protects against water splash and moisture exposure typical of outdoor RC driving, making it suitable for wet grass, muddy terrain, and damp conditions commonly encountered across the UK. However, it should not be submerged and requires normal drying if subjected to heavy water exposure.
- What is the difference between this Firma 25A and similar Spektrum brushed ESCs? — The key distinguishing feature is the 2-in-1 integrated receiver design that simplifies wiring and saves chassis space compared to separate receiver and ESC units. The Smart telemetry capability and dual protocol support also provide advanced functionality at an accessible price point for small-scale vehicle upgrades.
Why Buy from RC Model Shop?
RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the SPM Firma 25A 2-in-1 Brushed Smart ESC/Dual Protocol RX P-SPMXSER1025 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.
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