Firma 120A Brushless Smart ESC 3S-4S

The Spektrum Firma 120 A Brushless Smart ESC is a robust all-in-one power solution for 1/8 scale surface vehicles. Featuring waterproof durability, one-wire Smart telemetry, and programmable settings via button, programming box, or app—it's an ideal high-performance upgrade for demanding RC applications.

Features

• Integrated 120 A Smart ESC with real-time telemetry using SRXL2 link
• 32-bit ARM M4 processor for precise throttle control and response
• Waterproof, dust-resistant housing suitable for all-weather use
• Supports forward‑brake and forward‑brake‑reverse drive modes
• Selectable 6 V or 7.4 V @ 4 A BEC to power accessories
• Multi-point safety protection: over-current, thermal, auto cutoff, failsafe
• High‑heat IC5 battery input connector, backwards compatible with EC5
• Firmware updatable via SmartLink, button or Smart ESC Programmer Box

What’s in the box

• Firma 120 A Smart ESC (IC5 connector / 4 mm bullet output)
• Spektrum Smart sticker
• Instruction manual

Needed to complete

• Compatible surface receiver (DSMR/DSMX/SLT capable)
• 3 S or 4 S LiPo battery (IC™/EC™ connector)
• Full-range surface transmitter

Specifications

• Continuous current: 120 A
• Burst current: up to 830 A
• Input voltage: 3 S–4 S LiPo (11.1–14.8 V) or 8–12 cell NiMH
• BEC output: 4 A @ selectable 6 V or 7.4 V
• Connector types: IC5 input, 4 mm bullet output
• Drive modes: Forward‑brake and reverse supported
• Auto cutoff: Yes
• Programmable: Yes (button, Smart ESC Box, SmartLink app)
• Water-resistant: Yes
• Dimensions (L × W × H): ~43 × 39 × 34 mm
• Weight: ~153 g
• Time‑delay brake support: Yes
• Technology: Smart telemetry, firmware updatable