L293D Dual H-Bridge IC / module
by TI / ST
SKU: PSA-CMP-L293D
No reviews yetTypical India street price
₹40–₹120
Classic classroom motor driver IC (about 600 mA/ch).
Interface: 4 inputs + 2 enables (PWM)
H-bridge enable/direction often uses the motor overlay pins — mutually exclusive with LCD I2C.
Motor overlay uses D1 (and paired pins). Give motors their own battery.
Blockly: set_motor, motor_speed
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Concept
Two H-bridges in one chip so two DC motors can go both ways.
A little theory
TTL inputs. Big voltage drop (~1.4×2 Vce) — motors see less than Vs. Enable pins take PWM. In the classroom, treat L293D Dual H-Bridge IC / module as a beginner part using 4 inputs + 2 enables (PWM). Typical India street price is about ₹40–₹120. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
IN1/IN2 direction, EN PWM speed. Heat sink tab if stalled.
Classroom & project use
- 2WD robot
- IC-on-breadboard lesson
- Drivers & Relays classroom demo
Buying in India
Precautions
- Flyback is internal but still add bulk cap on Vs
- Don’t exceed ~600 mA
Specifications
| Current | ~600mA/ch |
| Package | DIP-16 |
| Category | Drivers & Relays |
| Difficulty | Beginner |
| Voltage | 5V logic; motor 4.5–36 V |
| Interface | 4 inputs + 2 enables (PWM) |
Pinout
See module silkscreen: typically VCC, GND, and signal pins. Confirm labels against the seller photo — clones vary.
