30A 20A BLHeli_S ESC OPTO DSHOT600 2–4S Brushless Speed Controller for FPV Racing Drone

Overview

This compact and high-performance ESC (Electronic Speed Controller) is designed for 2–4S FPV racing drones, offering reliable current output of 20A or 30A with DSHOT600 digital protocol support. Built with high-quality components and loaded with the latest BLHeli_S firmware, this ESC ensures ultra-smooth throttle response, fast motor startup, and enhanced flight control for freestyle, racing, or fixed-wing applications.

Key Features

• Input Voltage: 2–4S LiPo

• Continuous Current: 30A (Burst: 35A for 10s), 20A variant also available

• Firmware: BLHeli_S (supports DSHOT600, Multishot, Oneshot42, Oneshot125)

• Bootloader: BLHeli_S compatible for easy tuning

• MCU: SILABS EFM8BB21F16 @ 48MHz

• MOSFETs: N-channel FETs with high-speed switching

• Drive Chip: Independent gate driver for faster and smoother response

• Protection: Built-in thermal protection for safe operation

• BEC: None (OPTO type)

Construction & Design

• PCB Size: 24mm × 12mm (excluding wires)

• Weight:

  • 20A version: 5.1g

  • 30A version: 5.3g

• Wiring:

  • Power Wires: 18AWG, 80mm length

  • Signal Wires: 120mm length

  • Material: Ultra-flexible silicone wires

• Mounting: Direct-solder PCB pads ensure secure connection and minimal weight

Benefits

• Ultra-lightweight and mini-sized for easy installation

• Optimized for multirotors, supports fixed-wing and helicopters

• Excellent for high KV motors and aggressive flight styles

• Simple throttle calibration under DSHOT600 — no throttle range setup needed