Differences between DRV8844 and SN754410 half-H bridges

Thread Starter

Agripa

Joined May 4, 2018
2
Dear colleagues,

I am planning to use one of them to provide bidirectional control to two motors (drive currents less than 1A @ 12VDC), so they can rotate in the two ways. I've gone over two options by TI: DRV8844 and SN754410 (datasheets linked).

The point is that despite technical specifications describe both ICs as quadrupole half-H bridges, I'm not sure if they implement the same circuitry at component level.

SN754410 datasheet is more complete on schematics, from which I can understand they implement TTL logic to drive the current using Darlington pairs and single transistors. On the other hand, DRV8844 datasheets are not generous in schematics, so I cannot check if they use the same logic or, but on the contrary, they implement some other technology.

¿Could you give me a light on this issue?

Thank you very much in advance.
 

shortbus

Joined Sep 30, 2009
8,311
I'm familiar with the 754410, it was made as a pin for pin replacement for the L293, that used new tech and dropped less current in the chip. Both of them are through hole chips. The 8844 is a new one to me, and looks like just scanning the data sheet to be similar but just a surface mount only version.

What difference does it make if they use different "internal tech" to do the job? Don't quite understand why that makes a difference. The main thing to look at, and I didn't, is do the pins do the same thing. Do the controls work the same is the main thing, not the internal technology of the chip. I'm assuming that your wanting to make a circuit that was for through hole parts originally but want to do it with surface mount parts.
 

Thread Starter

Agripa

Joined May 4, 2018
2
Thank you very much for your answer. You are right, I want to make a circuit that was initially for through hole parts but now I want to do it with surface mount parts.

After go over the datasheets again finally I checked both ICs do the same job, so I'll go for the 8844 as a replacement of the 754410 for the SMD version.
 
Top