Product Datasheet

Key Features

16-bit absolute magnetic encoder - 65,536 counts/rev (0.0055 deg/count)
High-speed and low-speed options are available
Current-based torque, speed, and position control modes
High-speed option: 5-16V DC, 3A rated, 48W max - stall torque 1.78 Nm, no-load speed 200 RPM (1200 deg/s)
Low-speed option: no-load speed is 4.9x slower at 40.82 RPM (244.90 deg/s), with the same 1.78 Nm stall torque
Multi-protocol: PWM (angle mode / continuous rotation) and Serial (half-duplex single-wire bus)
Serial bus: per-servo addressing with broadcast command support - see Section 2
Safety: overcurrent protection, thermal cutoff, ESD protection on all signal pins
Full metal gear train with ball-bearing output shaft; partial metal housing for passive heat dissipation; 25T standard spline

Product Image

ACT48S smart servo motor, background removed

Interface - Molex 5045 (3-pin)

Molex 5045 (3-pin)

1 GND Ground

2 VCC Power Input 5-16V, 3A max

3 SIG PWM / Serial (half-duplex)

Protocol: PWM / Serial (firmware-configured)
Connector: Molex 5045, 3-pin (2.54mm pitch)
Mating: Molex 22-01-1032, 3-pin female housing (2.54mm pitch)

Brief Specification

Supply Voltage5-16V DC
Max Current3A
No-Load Current16V / 400mA
Max Power48W
Stall Torque1.78 Nm
No-Load Speed200 RPM (1200 deg/s)
Encoder16-bit Magnetic (Absolute)
Input ProtocolPWM / Serial
Gear SystemFull Metal Gear
Output Shaft25T Spline, Ball Bearing
ConnectorMolex 5045, 3-pin
Operating Temp.-20 degC to +70 degC
Dimensions (W x D x H)26 x 46 x 45 mm

Dimensions

Specification

ACT48S / ACT48T

Full Technical Reference - ACT48 Product Datasheet Rev 1.0

Parameter	Condition / Mode	Value	Unit
Mechanical
Dimensions (W x D x H)	Housing, excl. mounting tabs	26 x 46 x 45	mm
Weight	—	TBD	g
Gear System	—	Full metal gear train	—
Output Shaft Bearing	—	Precision ball bearing	—
Output Shaft Spline	—	25T standard spline - compatible with standard servo horns	—
Mounting	—	M2 x 8 (4 front / 4 rear)	—
Thermal Design	—	Partial metal housing - passive heat dissipation via case	—
Power Supply
Supply Voltage	Operating range	5-16	V DC
Max Current	Peak input current	3	A
No-Load Current	At 16 V	400	mA
Max Power Consumption	Peak	48	W
Overcurrent Protection	—	Yes - automatic shutdown on overcurrent	—
Thermal Protection	—	Yes - automatic cutoff on overtemperature	—
Performance
Stall Torque	ACT48S	1.78	Nm
Stall Torque	ACT48T	1.78	Nm
No-Load Speed	ACT48S	200 (1200 deg/s)	RPM
No-Load Speed	ACT48T	40.82 (244.90 deg/s)	RPM
Control Modes	Position control	Current-based, closed-loop	—
	Speed control	Current-based, closed-loop	—
	Torque control	Direct current reference	—
Encoder
Encoder Type	—	Magnetic (absolute)	—
Encoder Resolution	—	16	bit
Counts per Revolution	—	65,536	counts/rev
Angular Resolution	Per count	0.0055	deg

Specification

ACT48S / ACT48T

Control Interface - Environmental Reference - ACT48 Product Datasheet Rev 1.0

Parameter	Condition / Mode	Value	Unit
Control Interface
Input Protocol	PWM	Standard RC servo PWM	—
Input Protocol	Serial	Half-duplex, single-wire UART	—
Connector Type	—	Molex 5045, 3-pin (2.54mm pitch)	—
Mating Connector	—	Molex 22-01-1032, 3-pin female housing (2.54mm pitch)	—
ESD Protection	Signal pins	Yes	—
Environmental & Reliability
Operating Temperature	Continuous	-20 to +70	degC
Storage Temperature	Non-condensing	-20 to +85	degC
Humidity (Operating)	Non-condensing	10 ~ 90	% RH

Input Protocol Reference

ACT48S / ACT48T

PWM - Serial Interface - ACT48 Product Datasheet Rev 1.0

1. Input Protocol Overview

The ACT48 supports two input protocols on the SIGNAL pin. The active protocol is selected via firmware configuration. In PWM mode, the servo operates as a standalone actuator responding to position or speed commands. In Serial mode, multiple ACT48 units share a single signal line and respond to individually addressed or broadcast packets.

1-1. PWM

Standard RC servo PWM is decoded from a periodic pulse generated by the host controller. The meaning of the PWM pulse width is determined by control-table address 0x85 (Operating Mode). That mode cannot be changed from PWM input itself; it must be changed through the serial interface. PWM input supports 0x00 = Torque, 0x01 = Velocity, and 0x02 = Position. If 0x03 = Extended Position is selected, incoming PWM is ignored.

Parameter	Value	Note
Pulse Period	20 ms (50 Hz)	Standard RC servo period
Pulse Width Range	Configurable	Set by 0xB1 PWM Min and 0xB3 PWM Max; midpoint is their average
Resolution	16-bit	65,536 steps over full range
Operating Mode Source	Register 0x85	Selects Torque / Velocity / Position behavior for PWM input
Signal Timeout	Configurable	Set by 0xB5 PWM Timeout
Signal Level	3.3V / 5V compatible	Input logic threshold TBD

PWM Mode	Pulse Width - Action	Description
Torque mode	PWM Min / midpoint / PWM Max - negative / zero / positive torque command	PWM pulse width maps to the torque command. 0xB1 PWM Min and 0xB3 PWM Max define the usable time range. Because torque units are power-based in this system, this is a power-control input mode.
Velocity mode	PWM Min / midpoint / PWM Max - negative / zero / positive velocity command	PWM pulse width maps to target velocity. 0xB1 PWM Min and 0xB3 PWM Max define the usable time range, and direction follows which side of the midpoint the pulse width lies on.
Position mode	PWM Min-PWM Max - minimum to maximum position	PWM pulse width maps linearly to target position over the configured position range, using the adjustable bounds set by 0xB1 PWM Min and 0xB3 PWM Max.

1-2. Serial Interface

The serial interface reference has been moved to a dedicated document. ACT48 uses Model Number 0x01.
See Actuator Serial Interface.

Gear Options

ACT48S / ACT48T

High-Speed And Low-Speed Mechanical Configuration - ACT48 Product Datasheet Rev 1.0

Overview

ACT48 is available in two gear-train configurations. ACT48S is the high-speed option and matches the 200 RPM (1200 deg/s), 1.78 Nm reference specification. ACT48T is the low-speed option. It reduces output speed by 4.9x through the internal gear arrangement while keeping the same 1.78 Nm stall torque.

In the low-speed configuration, the user can disassemble the servo and readjust the gear positions to convert the unit into the high-speed configuration. The electrical interface and protocol behavior stay the same; only the mechanical reduction path changes.

ACT48S Gear Placement

High-speed gear arrangement. This is the faster output configuration at 200 RPM (1200 deg/s) no-load speed.

ACT48T Gear Placement

Low-speed gear arrangement. Compared with ACT48S, this mode runs 4.9x slower at 40.82 RPM (244.90 deg/s) no-load speed while maintaining the same 1.78 Nm stall torque.

Mechanical Conversion Note

Variant	No-Load Speed	Stall Torque
ACT48S	200 RPM (1200 deg/s)	1.78 Nm
ACT48T	40.82 RPM (244.90 deg/s)	1.78 Nm

Pricing

ACT48S / ACT48T

Standard Unit Pricing - ACT48 Product Datasheet Rev 1.0

Part Number Naming Rule

ACT Actuator

48 Power

S Option

-

x Country

Prefix

ACTActuator

Power Code

48Maximum 48 W, single power option

Option

SHigh-speed option

TLow-speed option

Country of Origin

CChina

KKorea

XUnspecified

Sample Unit Pricing - ACT48T Series

Listed prices are for representative ACT48T sample units. Volume pricing available on request.

Part Number	Description	Qty	Unit Price
ACT48T-X	ACT48 low-speed servo motor, country code x	1 pcs	US$ 80

ⓘ Volume pricing available for orders of 10 units or more - contact us for a quote. ✉ hyon646@gmail.com

◉ Corporate and laboratory volume orders qualify for significant discounts and dedicated technical support.

How to Order

Select your model using the Part Number Naming Rule above. Use ACT48S-X for the high-speed option and ACT48T-X for the low-speed option. Price on this page is listed for ACT48T-X.

Lead Time (stock)	1-3 business days
Lead Time (order)	4-6 weeks
Minimum Order Qty	1 pcs (standard) - 10 pcs (volume)
Payment	PayPal - Bank Transfer - Other (on request)
Shipping	Worldwide - DHL / FedEx / EMS
Contact	hyon646@gmail.com

Document Revision History

Version	Date	Description
v1.0	2026-05-21	Initial Release

ProductDatasheet

Specification

Specification

Input Protocol Reference

Gear Options

Pricing

Product
Datasheet