Motor DriversQUICK REFERENCE
L293D
The 16-pin DIP H-bridge: power domains, paired outputs and enable logic.
01Pin map • top view, notch up
- Left side, top to bottom
- 1 EN1,2; 2 IN1; 3 OUT1; 4 GND; 5 GND; 6 OUT2; 7 IN2; 8 motor VCC2.
- Right side, bottom to top
- 9 EN3,4; 10 IN3; 11 OUT3; 12 GND; 13 GND; 14 OUT4; 15 IN4; 16 logic VCC1.
- Supplies
- Logic VCC1: 4.5–7 V; motor VCC2 up to 36 V per datasheet. Connect all ground pins.
02Direction table • each pair
- EN LOW
- Outputs disabled → coast.
- EN HIGH, IN1/IN2 = 10
- OUT1/OUT2 = 10 → forward (wiring-dependent).
- EN HIGH, IN1/IN2 = 01
- OUT1/OUT2 = 01 → reverse.
- EN HIGH, equal inputs
- Both outputs equal → brake.
03Limits
- Current
- 600 mA per channel rating; thermal/package limits can reduce usable current.
- Protection
- L293D includes clamp diodes; L293 without D differs.
- Speed
- Apply PWM to the enable input; account for driver voltage drop.