Overview
The L293E is a quad push-pull driver produced by STMicroelectronics, designed to deliver output currents up to 1A per channel. Each channel is controlled by a TTL-compatible logic input, and each pair of drivers (a full bridge) includes an inhibit input that can turn off all four transistors. The device features a separate supply input for the logic, allowing it to operate at a lower voltage to reduce power dissipation. The L293E is packaged in a 20-pin plastic DIP and includes external connections for sensing resistors, which are useful for switchmode control.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (Vs) | 36 | V |
| Logic Supply Voltage (Vss) | 4.5 - 36 | V |
| Input Voltage (Vi) | 7 | V |
| Inhibit Voltage (Vinh) | 7 | V |
| Peak Output Current (non-repetitive) | 2 | A |
| Total Power Dissipation at Tground-pins = 80°C | 5 | W |
| Storage and Junction Temperature | -40 to +150 | °C |
| Thermal Resistance Junction-case | 14 | °C/W |
| Thermal Resistance Junction-ambient | 80 | °C/W |
Key Features
- Output current up to 1A per channel
- Peak output current of 2A per channel (non-repetitive)
- Inhibit facility to turn off all four transistors
- Separate logic supply input
- High noise immunity
- Overtemperature protection
- External connection of sensing resistors for switchmode control (L293E specific)
Applications
- DC motor controls: The L293E can be used to control bidirectional DC motors, including fast motor stop and free running modes.
- Bipolar stepping motor control: It can also be used in stepping motor drivers with phase current control and short circuit protection.
- General-purpose driver applications: Suitable for any application requiring high current drive capabilities with TTL-compatible logic inputs.
Q & A
- What is the maximum output current per channel of the L293E?
The L293E can deliver up to 1A per channel.
- What is the peak output current of the L293E?
The peak output current is 2A per channel (non-repetitive).
- Does the L293E have overtemperature protection?
Yes, the L293E includes overtemperature protection.
- Can the logic supply of the L293E be run at a lower voltage?
Yes, the L293E has a separate supply input for the logic, allowing it to operate at a lower voltage to reduce power dissipation.
- What is the package type of the L293E?
The L293E is packaged in a 20-pin plastic DIP.
- Does the L293E have external connections for sensing resistors?
Yes, the L293E has external connections for sensing resistors, useful for switchmode control.
- What is the thermal resistance junction-case of the L293E?
The thermal resistance junction-case is 14°C/W.
- Can the L293E be used for bipolar stepping motor control?
Yes, the L293E can be used for bipolar stepping motor control with phase current control and short circuit protection.
- How should the GND pins of the L293E be soldered for heat dissipation?
The GND pins should be soldered to a suitable copper area of the printed circuit board or to an external heatsink, ensuring the pins' temperature does not exceed 260°C and the soldering time does not exceed 12 seconds.
- Is the L293E still in production?
No, the L293E is obsolete and no longer manufactured. Recommended substitutes include the L293B.
