Home Motor drivers About H-bridges 6-trans. Tilden H-bridge "Full-featured" H-bridge Wilf's reversing H-bridge Buffered H-bridges Bolt's 4-trans. H-bridge The Z-bridge 74*245-based driver 74*240-based driver 74*24x drives compared Stepper motor drivers Solar engines Sensors Complete robots Misc. circuits   The BEAM Circuits Collection is a BEAM Reference Library site.		74*24x-based motor drivers compared Very similar, but you need to know the differences In many ways, both the 74*240 and 74*245 are equally handy for BEAM use; both have 20 pins, and so the main difference that most folks will care about is that one inverts drive inputs, while the other doesn't. Out of curiousity, I decided to torture test the two chips to see how they compared under load. As I've noted on the 74*240 and 74*245 drive pages, the available drive current is a function of both your supply voltage, as well as of the output voltage you can tolerate. Below, I've plotted a comparison of the data I collected from these chips: Voltage drop as a function of drive current and supply voltage -- here, driving a load between a single buffer and ground (click to expand) Voltage throughput as a function of drive current and supply voltage -- here, driving a load between a single buffer and ground (click to expand) Voltage drop as a function of drive current and supply voltage -- here, driving a load between a pair of buffers (click to expand) Voltage throughput as a function of drive current and supply voltage -- here, driving a load between a pair of buffers (click to expand) As you can see, the chips behave very similarly (more so than I really expected). In fact, you only see much of a difference when you really push the chips to their limits.
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