| 35KG·CM STALL | 0.070S/60° NO-LOAD | 8.4V RATED |
| 87G WEIGHT | StainlessGEARTRAIN | 360°TRAVELCustomizable |
Overview
The XQ-S8335TTL is the sealed brushless servo with a TTL bus interface: same 35 kg·cm, 0.07 s/60°, 87 g and IP67 case as the S8335DW, addressed over a serial line instead of a PWM channel.
The combination is aimed at machines that are both wet and crowded with servos — a submersible ROV arm, an agricultural rover, a hull with a dozen actuators. One bus replaces a dozen signal runs, and the seal means the connectors can live where water collects.
The geartrain is stainless steel on two ball bearings with a 25T-φ5.94 output spline. The amplifier is digital with a 2 µs dead band, and the case is a CNC aluminium 21 × 40.5 × 37.6 mm block with the fins doing the motor cooling.
Performance at each supply voltage
| Supply | No-load speed | Peak stall torque | Idle current | Stall current |
|---|---|---|---|---|
| 6.0 V | 0.120 s/60° (500 °/s) | 24 kg·cm (2.35 N·m / 333 oz·in) | 300 mA | 2.8 A |
| 7.4 V | 0.090 s/60° (667 °/s) | 30 kg·cm (2.94 N·m / 417 oz·in) | 350 mA | 3.5 A |
| 8.4 V | 0.070 s/60° (857 °/s) | 35 kg·cm (3.43 N·m / 486 oz·in) | 410 mA | 4.0 A |
Control specification
| Item | Specification |
|---|---|
| Command signal | TTL serial |
| Amplifier | Digital controller |
| Dead band | 2 µs |
| Rotating direction | CCW (1000–2000 µs) |
| Travel | 360°, customizable |
Mechanical specification
| Item | Specification | Item | Specification |
|---|---|---|---|
| Dimensions | 21 × 40.5 × 37.6 mm | Case material | Aluminium, CNC |
| Weight | 87 g | Geartrain | Stainless steel |
| Bearings | 2 × ball bearing | Motor | Brushless |
| Output spline | 25T-φ5.94 mm | Horn | Plastic, POM |
| Lead / connector | 300 mm | Mechanical limit | 210° |
| Operating temperature | −15 °C to 65 °C | Storage temperature | −20 °C to 70 °C |
| Ingress protection | IP67 | Travel | 360°, customizable |
What’s in the box
- 1 × XQ-S8335TTL servo
- 1 × POM horn set
- 1 × mounting screw pack
Optional: metal horn, sold separately.
How to size it
Torque follows the rail: 24 kg·cm at 6.0 V, 30 kg·cm at 7.4 V, 35 kg·cm at 8.4 V. On a shared bus the current adds up fast — three nodes at 4.0 A stall is 12 A, so feed the bus from a supply that can hold voltage through that, not from the controller’s regulator.
Serial does not mean signal-safe in water. Use a shielded pair with the shield grounded at one end, keep the connector grease-filled, and check that the bus ground is common with the power ground at a single point.
FAQ
What is the difference between the S8335DW and the S8335TTL?
Only the interface. Both are IP67, 35 kg·cm at 8.4 V, 0.07 s/60°, 87 g, 21 × 40.5 × 37.6 mm, stainless geartrain on two ball bearings.
Can the serial version survive the same conditions?
Yes — the case, seals and geartrain are the same parts. The only difference is that the lead now carries a bus pair and power, so the cable gland is where water gets in if it is not tightened.
Is the pulse width table valid for this unit?
No. The 800–2200 µs window on the inspection sheet is the PWM template of the same mechanical build. This unit is commanded by the serial protocol; ask for the register map before writing firmware.
What horn fits?
Standard 25T spline, φ5.94 mm centre. POM horn set and screw pack are in the box.
Other interfaces
Downloads
- XQ-S8335TTL inspection specification (PDF, 818 KB)
Torque, speed and current at each supply voltage, mechanical data, control specification, mounting dimensions. - 2D dimension drawing (image)
Mounting hole positions, case depth and overall height; the same drawing is inside the datasheet.
