TB6600 — 4.0A Stepper Motor Driver Module

Overview

The TB6600 is an industrial-style enclosed microstepping stepper motor driver module based on Toshiba's motor driver ICs (originally the TB6600HG, and in modern production units, the TB67S109AFTG). Housed in a rugged black anodized aluminum heatsink casing, it is engineered for high-power NEMA 17, NEMA 23, and NEMA 24 bipolar stepper motor applications in DIY CNC routers, 3D printers, laser cutters, and heavy robotics.

The module features high-speed optocoupler isolation for pulse, direction, and enable inputs (protecting control electronics from motor EMI noise), DIP switch configuration for microstep resolution (up to 1/32 step) and peak output current limiting (from 0.5 A to 3.5 A / 4.0 A peak), and automatic half-current idle reduction to limit motor heating when stationary.

Quick reference


Motor supply voltage (`VCC`)	9.0 V to 42.0 V DC (24 V to 36 V recommended)
Peak output current	4.0 A (0.5 A to 3.5 A working current set by DIP switches)
Logic signal voltage	+5.0 V DC nominal (use inline $2\text{ k}\Omega$ resistor for 12V/24V PLC signals)
Control inputs	Optocoupler isolated `PUL` (Step), `DIR` (Direction), `ENA` (Enable)
Microstep resolution	1 (Full), 2, 4, 8, 16, 32 microstep modes
Enclosure	Aluminum heatsink casing with screw-terminal blocks

Terminal blocks & connections

The driver module exposes two heavy-duty screw terminal blocks:

Power & Motor Terminals (4-pin & 2-pin block)

Terminal	Signal	Description
`VCC` / `DC+`	Motor Power	Positive DC motor power supply (+9 V to +42 V DC)
`GND` / `DC-`	Motor Ground	Power supply ground reference
`A+`	Motor Coil A+	Phase A positive stepper motor lead
`A-`	Motor Coil A-	Phase A negative stepper motor lead
`B+`	Motor Coil B+	Phase B positive stepper motor lead
`B-`	Motor Coil B-	Phase B negative stepper motor lead

Signal Input Terminals (6-pin block)

The signal interface uses high-speed optocouplers with differential positive/negative terminals:

Terminal	Signal	Description
`PUL+` / `CLK+`	Pulse Input (+)	Step pulse signal positive line
`PUL-` / `CLK-`	Pulse Input (-)	Step pulse signal negative line
`DIR+`	Direction (+)	Direction signal positive line
`DIR-`	Direction (-)	Direction signal negative line
`ENA+`	Enable (+)	Offline enable signal positive line
`ENA-`	Enable (-)	Offline enable signal negative line

DIP switch settings

Onboard 6-position DIP switches configure microstepping resolution (SW1–SW3) and current limit (SW4–SW6):

Microstep Resolution Selection (SW1, SW2, SW3)

Microstep	Steps/Rev (1.8° Motor)	SW1	SW2	SW3
Full (1)	200	OFF	OFF	OFF
1/2	400	ON	OFF	OFF
1/2 (mode B)	400	OFF	ON	OFF
1/4	800	ON	ON	OFF
1/8	1600	OFF	OFF	ON
1/16	3200	ON	OFF	ON
1/32	6400	OFF	ON	ON

Current Limiting Selection (SW4, SW5, SW6)

Output Current (Peak)	Output Current (RMS)	SW4	SW5	SW6
0.5 A	0.4 A	ON	ON	ON
1.0 A	0.9 A	OFF	ON	ON
1.5 A	1.3 A	ON	OFF	ON
2.0 A	1.8 A	OFF	OFF	ON
2.5 A	2.2 A	ON	ON	OFF
2.8 A	2.5 A	OFF	ON	OFF
3.0 A	2.7 A	ON	OFF	OFF
3.5 A (4.0A Peak)	3.2 A	OFF	OFF	OFF

Specifications

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Motor Supply Voltage	$V_{CC}$	9.0	24.0	42.0	V	DC power supply
Signal Input Voltage	$V_{SIG}$	4.5	5.0	5.5	V	$5\text{ V}$ logic (use series resistor for 12/24V)
Optocoupler Forward Current	$I_{F\_opto}$	8.0	10.0	15.0	mA	Per control signal
Max Step Pulse Frequency	$f_{PUL}$	—	—	200	kHz	High-speed optocouplers
Pulse Width High	$t_{PUL\_high}$	2.5	—	—	µs	Minimum pulse width
Operating Temperature	$T_{opr}$	-10	—	45	°C	Ambient air

Wiring configurations

Common Cathode Wiring (Negative Pins Tied Together)

When driving from standard 5V MCU pins (Arduino / ESP32):

Connect PUL-, DIR-, ENA- together and wire to MCU GND.
Connect PUL+ to MCU Step Pin (e.g. D2).
Connect DIR+ to MCU Direction Pin (e.g. D3).
Leave ENA+ unconnected (enabled by default) or wire to MCU Enable Pin.

Common Anode Wiring (Positive Pins Tied Together)

Connect PUL+, DIR+, ENA+ together and wire to MCU +5V.
Connect PUL- to MCU Step Pin (active-low drive).
Connect DIR- to MCU Direction Pin (active-low drive).

Warning

High Voltage Signal Input Warning:

The internal optocouplers are sized for 5 V DC signals. If driving the inputs directly from 12V or 24V PLC outputs, you MUST install an external current-limiting resistor ( $1\text{ k}\Omega$ for 12V, $2\text{ k}\Omega$ for 24V) in series with each + signal line to prevent burning out the internal optocouplers.

Common mistakes

Inverting DIP Switch Labels: Printed tables on cheap clone modules often invert the interpretation of ON and OFF states. If motor steps seem erratic or current is too low, verify the ON arrow stamped on the dip switch body.
Disconnected Motor Wires: Connecting or disconnecting motor leads (A+, A-, B+, B-) while $V_{CC}$ power is applied causes immediate inductive breakdown of the output bridge MOSFETs.
Forgetting Common Ground on Signal Lines: Failing to connect the controller ground to PUL-/DIR- in common-cathode mode prevents current flow through the optocoupler LEDs.

Notes

TB6600 vs TB67S109AFTG: Original TB6600HG chips used older BiCMOS technology; modern "TB6600" modules almost universally utilize the newer Toshiba TB67S109AFTG IC, which runs cooler due to lower MOSFET $R_{DS(on)}$ resistance.

Interface	PUL/DIR/ENA Optocoupled Inputs
Package	Enclosed Aluminum Heatsink Box Module