TECHNICAL SUPPORT
Published 2026-04-08
This guide provides the precise voltage specifications for the MG995servomotor. Understanding the correct voltage is critical for reliable operation and preventing permanent damage. Below you will find the absolute operating range, the recommended voltage for optimal performance, real-world case examples, and actionable steps to ensure yourservofunctions correctly.
The MG995servohas a strict voltage window. Exceeding these limits will cause immediate failure or fire hazard.
Minimum operating voltage:4.8V DC
Below 4.8V, the servo will not start, will jitter erratically, or will lack enough torque to move its load.
Maximum operating voltage:7.2V DC
Applying more than 7.2V (for example, a fully charged 2S LiPo battery at 8.4V) will burn the internal control circuit and damage the DC motor.
Safe continuous range:5.0V – 6.0V (recommended for long life)
Based on extensive testing and manufacturer specifications, theoptimal voltage is 6.0V DC. At this voltage, the MG995 delivers:
Stall torque:Approximately 10–12 kg·cm (actual value depends on load)
Operating speed:0.17 sec/60° (no load)
Current draw at stall:0.8A – 1.2A (peak up to 1.5A)
At 5.0V, torque drops by about 20-25%, and speed decreases noticeably. At 7.2V,while torque and speed increase slightly, the internal components overheat rapidly, reducing lifespan to hours instead of years.
Case 1 – Insufficient voltage (4.8V supply):
A hobbyist built a robotic arm using a 4.8V NiMH battery pack. The MG995 servos constantly stalled when lifting a 300g weight. After measuring voltage under load (which dropped to 4.5V), the user switched to a 6V regulated power supply. The arm then operated smoothly without stalling.
Case 2 – Over-voltage (7.4V LiPo battery):
Another user connected a 2S LiPo battery (nominal 7.4V, fully charged 8.4V) directly to an MG995. Within 2 minutes of continuous movement, the servo case became too hot to touch. The internal driver chip failed permanently. Replacing the servo and adding a 6V voltage regulator solved the issue.
Case 3 – Common unstable voltage (USB 5V from computer):
A beginner powered an MG995 from a computer USB port (5V, 0.5A max). The servo caused the USB port to shut down due to over-current protection. The MG995 requires at least 0.8A peak; USB ports cannot supply this. The correct solution was an external 6V, 2A power supply.
Deviating from the recommended range causes three specific failure modes:
Critical point to remember: The MG995’s internal voltage regulator is not designed to dissipate excess heat from over-voltage. Unlike digital servos with switching regulators, the MG995 uses a linear regulator. Any voltage above 6V generates waste heat proportional to the voltage difference.
The voltage value alone is insufficient. Your power source must also meet these two requirements:
Current capacity: Minimum 1.5A per servo (2A recommended for reliability). For multiple MG995 servos, sum their stall currents and add 30% margin.
Regulation: Use a regulated DC power supply or a UBEC (Universal Battery Elimination Circuit). Unregulated batteries (e.g., 5-cell NiMH at 6V nominal) can drop below 5V under load, causing jitter.
Example calculation:
For 4 MG995 servos operating simultaneously, each may draw 0.5A average and 1.2A peak. The power supply must deliver at least 4 × 1.2A = 4.8A peak, plus margin → use a 6V / 6A supply.
Follow these actions to guarantee your MG995 servo works correctly and lasts for years:
1. Measure your actual voltage under load – not idle voltage. Use a multimeter while the servo is moving.
2. Set your power supply to 6.0V ±0.2V – this is the single best decision.
3. Add a large capacitor (1000µF – 2200µF, 10V or higher) near the servo’s power pins. This absorbs voltage spikes and prevents brown-outs.
4. Never power an MG995 directly from a microcontroller’s 5V pin (Arduino, Raspberry Pi, etc.). The servo will draw more current than the board can supply, causing resets or damage.
5. Use twisted or short power wires – long thin wires add resistance and cause voltage drop. Keep wires under 30cm (12 inches) for 6V operation.
6. If you must use batteries, choose a 5-cell NiMH pack (6V nominal) or a 2S LiPo with a 6V BEC regulator. Do not connect LiPo directly.
Q: Can I run MG995 at 5V from a servo driver board?
A: Yes, but torque will be reduced by approximately 25%. For lightweight applications (e.g., small camera pan/tilt), 5V is acceptable. For robotic arms or wheel steering, use 6V.
Q: Will 6.6V (2S LiFePO4 battery) work?
A: Yes, a 2S LiFePO4 battery has a nominal voltage of 6.6V and fully charged 7.2V. This is at the absolute maximum limit. Monitor servo temperature. If it becomes hot after 1 minute of use, add a 6V regulator.
Q: What happens if I use 7.4V for a few seconds?
A: The servo may survive a brief over-voltage event, but the internal driver IC’s lifespan is permanently reduced. Repeated exposure will cause failure.
Q: My servo jitters at 6V. Is the voltage wrong?
A: Jitter usually indicates insufficient current or a bad ground connection, not incorrect voltage. Check your power supply’s current rating and ensure all ground wires (signal ground and power ground) are common.
Core point to repeat:
> The MG995 servo must operate between 4.8V and 7.2V, with 6.0V being the single best voltage for both performance and longevity. Voltages below 5.0V cause weak torque and jitter; voltages above 6.5V cause overheating and rapid failure. Never exceed 7.2V under any circumstance.
Actionable conclusion:
Immediately set your power source to deliver 6.0V regulated with at least 2A current capacity per servo.
Install a 1000µF capacitor across the power terminals.
Measure voltage under load – if it drops below 5.5V, upgrade your power supply or shorten the wires.
Never use a 2S LiPo (7.4V nominal) without a step-down regulator.
By following these voltage guidelines, your MG995 servo will deliver consistent, reliable performance for hundreds of hours of operation. Ignoring them leads to erratic behavior, permanent damage, and wasted time. Take action today – verify your voltage before your next project.
Update Time：2026-04-08
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