L293D Reference Tables, Pins & Specifications

Pin reference

Signal names, electrical functions and connection guidance

PDIP-16

Physical pin numbers16 pins

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L293D pin functions and connections
Signal	Type	Function & connection
1,2EN	Active-HIGH enable	Enables outputs 1Y and 2Y together. LOW makes both high impedance. Connection guidance Connect to a defined logic control or PWM signal. Add a pull-down so the motor stays disabled during controller reset.
1A	Driver 1 input	Controls the first half-bridge when enabled. Connection guidance First direction-control signal.
1Y	Driver 1 output	First motor terminal for bridge A. Connection guidance Connect to one motor lead; the other goes to 2Y. Output has a voltage drop under load.
GND	Ground and heat path	Supply return and package thermal connection. Connection guidance Connect with pins 5, 12 and 13 to a ground plane.
GND	Ground and heat path	Supply return and package thermal connection. Connection guidance Connect all four ground pins.
2Y	Driver 2 output	Second motor terminal for bridge A. Connection guidance Connect to the other motor lead.
2A	Driver 2 input	Controls the second half-bridge when enabled. Connection guidance Second direction-control signal.
VCC2	Motor supply	Supplies the four power output stages. Connection guidance Use +12 V in this example; decouple locally and add bulk capacitance. The reviewed TI operating table requires VCC2 ≥ VCC1 and ≤36 V.
3,4EN	Active-HIGH enable	Enables outputs 3Y and 4Y together. Connection guidance Tie LOW when the second bridge is unused.
3A	Driver 3 input	Controls the third half-bridge. Connection guidance Tie LOW if unused.
3Y	Driver 3 output	First output of bridge B. Connection guidance Leave open if bridge B is unused.
GND	Ground and heat path	Supply return and thermal connection. Connection guidance Connect to the same ground plane as pins 4, 5 and 13.
GND	Ground and heat path	Supply return and thermal connection. Connection guidance Connect all four ground pins.
4Y	Driver 4 output	Second output of bridge B. Connection guidance Leave open if bridge B is unused.
4A	Driver 4 input	Controls the fourth half-bridge. Connection guidance Tie LOW if unused.
VCC1	Logic supply	Supplies internal logic translation. Connection guidance Use +5 V and a 100 nF bypass to GND. Keep the logic and motor supply returns connected.

Operating conditions

TI L293DNE

Manufacturer-referenced values6 parameters

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Parameter	Value	Conditions / notes
Logic supply VCC1	4.5–7 V	Use 5 V in this example
Motor supply VCC2	VCC1 to 36 V	Separate motor power rail
Ambient temperature	0 to 70°C	Operating range
Input HIGH	≥2.3 V	At VCC1 = 5 V
Input LOW	≤1.5 V	Use normal 0 V logic LOW
Ground connections	4, 5, 12, 13	All required; also conduct heat

Do not confuse L293D current ratings with the higher-current L293.

Motor A control table

Motor between 1Y3 and 2Y6

Manufacturer-referenced values5 parameters

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Parameter	Value	Conditions / notes
EN LOW; A1/A2 any	Coast · outputs Z / Z	No commanded drive; clamp paths remain
EN HIGH; A1 HIGH, A2 LOW	Direction A	1Y HIGH; 2Y LOW
EN HIGH; A1 LOW, A2 HIGH	Direction B	1Y LOW; 2Y HIGH
EN HIGH; A1 LOW, A2 LOW	Brake to GND	Both outputs LOW
EN HIGH; A1 HIGH, A2 HIGH	Brake to motor rail	Both outputs HIGH

Physical clockwise direction depends on motor wiring. Braking does not stop motion instantaneously.

Current and voltage drop

L293D

Manufacturer-referenced values6 parameters

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Parameter	Value	Conditions / notes
Continuous output current	±600 mA per channel	Respect package thermal constraints
HIGH output at −0.6 A	VCC2 − 1.4 V typical	VCC2 − 1.8 V minimum
LOW output at +0.6 A	1.2 V typical	1.8 V maximum
Typical bridge loss at 0.6 A	1.56 W	0.6 A × (1.4 + 1.2 V), excluding logic losses
Typical motor voltage at 12 V	9.4 V at 0.6 A	12 − 1.4 − 1.2; not a regulated output
Clamp diodes	Built in	Inductive transient current returns to the rails

Voltage drops depend on current and temperature. The 9.4 V example is not valid for every load.

One-motor example

5 V logic · 12 V motor rail

Manufacturer-referenced values7 parameters

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Parameter	Value	Conditions / notes
Enable1	Controller output with 10 kΩ pull-down	Motor disabled while controller output floats
Direction inputs2 and7	Defined controller outputs	Change direction with a suitable stop/dead-time strategy
Motor leads	Outputs3 and6	Choose a motor with acceptable stall current
Logic bypass	100 nF	VCC1 pin16 to GND
Motor bypass	100 nF + suitable bulk capacitor	VCC2 pin8 to GND; example bulk 100 µF
Unused bridge	Pins9,10,15 LOW	Outputs11 and14 open
Return	Controller, both supplies and all GND pins	Common reference

Bulk capacitance is an example; account for wiring, motor energy and the supply’s ability to absorb current.

Package and stress limits

L293DNE

Manufacturer-referenced values5 parameters

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Parameter	Value	Conditions / notes
Reviewed package	PDIP-16	TI L293DNE; 2.54 mm lead pitch
Peak output current	±1.2 A	Nonrepetitive; duration ≤100 µs; stress rating
Maximum junction temperature	150°C	Absolute maximum; design for lower operating temperature
Storage temperature	−65 to +150°C	Unpowered
Board thermal resistance	36.4°C/W reference	TI JEDEC test-board condition; real layout differs

This page does not substitute a different manufacturer’s SMD package or pin map.