FrSky Xact M5251H Micro Digital HV Coreless Servo
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FrSky Xact M5251H Micro Digital HV Coreless Servo
The FrSky Xact M5251H is a compact, high-voltage digital servo designed for applications requiring exceptionally fast response. At 8.4V, it delivers up to 156.9 oz-in (11.3 kg-cm) of torque with an extremely quick 0.04 sec/60° transit time.
The M5251H features a responsive coreless motor, durable metal gears, dual precision ball bearings, and a Hall-effect position sensor. Its fully CNC-machined aluminum case provides strength and effective heat dissipation while maintaining a compact micro-servo size.
In addition to conventional PWM operation, the M5251H supports SBUS and F.Port 2.0/FBUS. When connected to compatible FrSky equipment, FBUS allows servo telemetry—including current, voltage, and temperature—to be returned to the transmitter. Servo travel and other supported settings can also be configured using compatible FrSky tools.
Key Features
- High-speed micro digital servo
- Up to 156.9 oz-in (11.3 kg-cm) torque at 8.4V
- Extremely fast 0.04 sec/60° transit time at 8.4V
- High-voltage operation up to 8.4V
- Responsive coreless motor
- Durable metal gear train
- Fully CNC-machined aluminum case
- Dual precision ball bearings
- Hall-effect position sensor
- Supports F.Port 2.0/FBUS, SBUS, and PWM
- Telemetry support with compatible FrSky equipment
- Configurable 90°, 120°, or 180° servo travel
- Over-current and over-temperature monitoring and alarms
- Upgradeable firmware
Performance Specifications
| Operating Voltage | Stall Torque | Speed | Stall Current |
|---|---|---|---|
| 6.0V | 120.8 oz-in (8.7 kg-cm) | 0.06 sec/60° | 1.7A |
| 7.4V | 147.2 oz-in (10.6 kg-cm) | 0.05 sec/60° | 1.9A |
| 8.4V | 156.9 oz-in (11.3 kg-cm) | 0.04 sec/60° | 2.0A |
Additional Specifications
- Operating voltage: 4.8–8.4V
- Servo type: Digital, high voltage
- Motor type: Coreless
- Gear material: Metal
- Output spline: 5 mm, 25T
- Dimensions: 0.91 × 0.47 × 1.14 in. (23 × 12 × 29 mm)
- Weight: 0.81 oz. (23 g)
- Refresh rate: 1520μs/333Hz or 760μs/700Hz
- Protocols: F.Port 2.0/FBUS, SBUS, and PWM
- Manufacturer part number: 03050623
Package Includes
- One FrSky Xact M5251H Micro Digital HV Coreless Servo
Servo telemetry, programming, and bus-control features require compatible FrSky equipment. Confirm the selected operating mode and refresh rate before use.