CA3242

The CA3242 quad-gated inverting power driver contains four gate switches for interfacing low-level logic to inductive and resistive loads such as: relays, solenoids, AC and DC motors, heaters, incandescent displays, and vacuum fluorescent displays.

CA3242 Output overload protection is provided when the load current (approximately 1.2A) causes the output V_CE(sat) to rise above 1.3V. A built-in time delay, nominally 25s, is provided during output turn-on as output drops from V_DD to V_SAT. That output will be shut down by its protection network without affecting the other outputs. The corresponding Input or Enable must be toggled to reset the output protection circuit.

CA3242 Steering diodes in the outputs in conjunction with external zener diodes protect the IC against voltage transients due to switching inductive loads.

To allow for maximum heat transfer from the chip, the four center leads are directly connected to the die mounting pad. In free air, junction-to-air thermal resistance (R_JA) is 60/W (typical). This coefficient can be lowered by suitable design of the PC board to which the CA3242 is soldered.