[dorkbotdc-blabber] Re: [HacDC:Blabber] L239 vs L239B vs L293D vs SN754410

[Alberto Gaitán]

Thanks, Elliot.

So, can I safely substitute an SN75' for the L239D in the 2-pin circuit 
here?

http://www.arduino.cc/en/Reference/StepperBipolarCircuit


Alberto



On 5/17/09 6:02 PM, Elliot Williams wrote:
> The SN754410 is my favorite little IC motor driver.  Cheap, good current draw.  They heat-sink through the ground pins, which is a bonus if you solder them to a big ground plane.  Rated 1A/channel = 2A/chip.  Snazzy.  
> 
> They get hot, but they work great.  I've run them at 2A/channel for short durations with no problems.  They have an internal over-temp shutdown if you're living on the edge, which I've not yet even used.  (Knocking on wood with my non-typing hand.)
>  
> If you go 293, the B's are comparable (though less current) to the SN75's, while the "D" adds clamping diodes that prevent motor's inductive transients from potentially frying the chip's internal transistors. 
> 
> (I run my SN75's without external diodes, but the spec sheet suggests that its built-ins are only intended for static discharge.  Had good luck so far anyway.  More knocking on wood.)    
> 
> So how to choose?  SN75's dominate the 293B's.  The 293D has protection diodes built in, if you were going to use them.  There's a buck or so between them all, depending on where you shop.  SN75 for me.  We have stocked both at HackerSmart.
> 
> 
> 
> 
> On Sun, 17 May 2009 11:12:36 -0400
> Alberto Gaitán <alberto.gaitan at gmail.com> wrote:
> 
>> Can any of you provide a birds eye view of this issue? If the 
>> application is driving steppers, are these two interchangable except for 
>> current needs (some are 600mA and the others 1A)? The price difference 
>> is pretty significant. How to select?
>>
>>   -Alberto
>>
>>
>>
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