L293DD/L293D pdf datasheet (PU

The Device is a monolithic integrated high voltage,
high current four channel driver designed to
accept standard DTL or TTL logic levels and drive
inductive loads (such as relays solenoides, DC
and stepping motors) and switching power transistors.
To simplify use as two bridges each pair of channels
is equipped with an enable input. A separate
supply input is provided for the logic, allowing operation
at a lower voltage and internal clamp diodes
are included.
This device is suitable for use in switching applications
at frequencies up to 5 kHz.
The L293D is assembled in a 16 lead plastic
packaage which has 4 center pins connected together
and used for heatsinking
The L293DD is assembled in a 20 lead surface
mount which has 8 center pins connected together
and used for heatsinking.