Product overview
The Flash Hobby XSD7A is a micro brushless electronic speed controller designed for multirotors, including racing applications. Its physical dimensions are 11.14 × 16.26 mm, with a net weight of 1.0g. The hardware combines a Siliconlabs EFM8BB21F16G microcontroller in a QFN-20 package, a dedicated high-speed drive IC and a twisted-pair silicone signal cable. The MCU operates at up to 50MHz, and the ESC supports rotational speeds up to 500,000 rpm. Electrical integration requires 1-2S LiPo input; current ratings are 7A continuous and 10A for bursts lasting no more than 10 seconds.
The XSD7A uses BLHELI_S firmware, with hardware-generated motor PWM and firmware updates through the signal cable. Supported control options include Dshot150, Dshot300, Dshot600, PWM, Oneshot125/42 and Multishot, together with Damped Mode. Damped light provides regenerative braking, while Dshot operation requires no throttle-stroke calibration. Throttle-signal detection is automatic, and normal PWM input uses 1-2ms pulses. When connected through a flight controller running CleanFlight or BetaFlight firmware, BLHeli software can set four ESC parameters at a time.
Specifications
| Specification | Value & conditions |
|---|---|
| Manufacturer and model | Flash Hobby XSD 7A ESC (XSD7A) |
| Product type | Micro brushless electronic speed controller |
| Dimensions | 11.14 × 16.26 mm |
| Net weight | 1.0g |
| Working voltage | 1-2SLiPo battery input. |
| Continuous current | 7AContinuous operation. |
| Burst current | 10ABurst duration ≤10s. |
| Supported signals and modes | Dshot600/300/150, PWM, Oneshot125/42, Multishot and Damped Mode |
| Firmware | BLHELI_S |
| Microcontroller | Siliconlabs EFM8BB21F16G MCU, QFN-20 package |
| MCU operating frequency | Up to 50MHz |
| Drive electronics | Dedicated high-speed drive IC |
| Supported rotational speed | Up to 500,000 rpm |
| Firmware update method | Online firmware upgradeVia the signal cable. |
| Motor PWM generation | Hardware-generated motor PWM |
| Braking | Regenerative brakingDamped light operation. |
| ESC parameter configuration | Set four ESC parameters at a time through the flight-controller connection using BLHeli softwareUsing a flight controller running CleanFlight or BetaFlight firmware. |
| PWM input pulse width | 1-2msNormal PWM throttle mode. |
| Throttle signal detection | Automatic detection |
| Throttle calibration requirement | Throttle-stroke calibration is not requiredUsing Dshot. |
| Signal cable construction | Twisted-pair silicone cable |
