L293D Motor Driver IC
L293D Motor Driver IC
Motor Driver IC L293D Pinout
L293D Pin Configuration
Pin Pin Name Description
Number
1 Enable 1,2 This pin enables the input pin Input 1(2) and Input
2(7)
2 Input 1 Directly controls the Output 1 pin. Controlled by
digital circuits
3 Output 1 Connected to one end of Motor 1
4 Ground Ground pins are connected to ground of circuit (0V)
5 Ground Ground pins are connected to ground of circuit (0V)
6 Output 2 Connected to another end of Motor 1
7 Input 2 Directly controls the Output 2 pin. Controlled by
digital circuits
8 Vcc2 (Vs) Connected to Voltage pin for running motors (4.5V
to 36V)
9 Enable 3,4 This pin enables the input pin Input 3(10) and Input
4(15)
10 Input 3 Directly controls the Output 3 pin. Controlled by
digital circuits
11 Output 3 Connected to one end of Motor 2
12 Ground Ground pins are connected to ground of circuit (0V)
13 Ground Ground pins are connected to ground of circuit (0V)
14 Output 4 Connected to another end of Motor 2
15 Input 4 Directly controls the Output 4 pin. Controlled by
digital circuits
Features
Can be used to run Two DC motors with the same IC.
Speed and Direction control is possible
Motor voltage Vcc2 (Vs): 4.5V to 36V
Maximum Peak motor current: 1.2A
Maximum Continuous Motor Current: 600mA
Supply Voltage to Vcc1(vss): 4.5V to 7V
Transition time: 300ns (at 5Vand 24V)
Automatic Thermal shutdown is available
Available in 16-pin DIP, TSSOP, SOIC packages
L293D Equivalent Dual Timer IC
LB1909MC, SN754410, ULN2003
Where to use L293D IC
The L293D is a popular 16-Pin Motor Driver IC. As the name suggests it is mainly used to
drive motors. A single L293D IC is capable of running two DC motors at the same time; also
the direction of these two motors can be controlled independently. So if you have motors
which has operating voltage less than 36V and operating current less than 600mA, which are
to be controlled by digital circuits like Op-Amp, 555 timers, digital gates or even Micron
rollers like Arduino, PIC, ARM etc.. this IC will be the right choice for you.
How to use a L293D Motor Driver IC
Using this L293D motor driver IC is very simple. The IC works on the principle of Half H-
Bridge, let us not go too deep into what H-Bridge means, but for now just know that H
bridge is a set up which is used to run motors both in clock wise and anti clockwise direction.
As said earlier this IC is capable of running two motors at the any direction at the same time,
the circuit to achieve the same is shown below.
All the Ground pins should be grounded. There are two power pins for this IC, one is the
Vss(Vcc1) which provides the voltage for the IC to work, this must be connected to +5V. The
other is Vs(Vcc2) which provides voltage for the motors to run, based on the specification of
your motor you can connect this pin to anywhere between 4.5V to 36V, here I have
connected to +12V.
Input 1 = HIGH(5v) Output 1 = HIGH Motor 1 rotates in Clock
wise Direction
Input 2 = LOW(0v) Output 2 = LOW
Input 3 = HIGH(5v) Output 1 = HIGH Motor 2 rotates in Clock
wise Direction
Input 4 = LOW(0v) Output 2 = LOW
The Enable pins (Enable 1,2 and Enable 3,4) are used to Enable Input pins for Motor 1 and
Motor 2 respectively. Since in most cases we will be using both the motors both the pins are
held high by default by connecting to +5V supply. The input pins Input 1,2 are used to
control the motor 1 and Input pins 3,4 are used to control the Motor 2. The input pins are
connected to the any Digital circuit or microcontroller to control the speed and direction of
the motor. You can toggle the input pins based on the following table to control your motor.
Input 1 = LOW(0v) Output 1 = LOW Motor 1 rotates in Anti-Clock
wise Direction
Input 2 = HIGH(5v) Output 2 = HIGH
Input 3 = LOW(0v) Output 1 = LOW Motor 2 rotates in Anti
-Clock wise Direction
Input 4 = HIGH(5v) Output 2 = HIGH
Input 1 = HIGH(5v) Output 1 = HIGH Motor 1 stays still
Input 2 = HIGH(5v) Output 2 = HIGH
Input 3 = HIGH(5v) Output 1 = LOW Motor 2 stays still
Input 4 = HIGH(5v) Output 2 = HIGH
Applications
Used to drive high current Motors using Digital Circuits
Can be used to drive Stepper motors
High current LED’s can be driven
Relay Driver module (Latching Relay is possible)
