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Sink capability of ULN2803 vs TPL9202

r10kindsofpeople
Prodigy 10 points
Other Parts Discussed in Thread: TPL9202

I know generic comparisons can be dicey...but that's what I'm looking for, just the same. ;) 

Assuming a 41 C ambient, all 8 outputs ON, low-side switching 12V relays, which device can handle more relays per output?  

At a glance, the ULN2803 seems more capable, throwing around numbers like 500mA continuous (abs max, I know), where the TPL9202 pretty solidly says "150 mA".  But when I start running numbers on power dissipation, the ULN2803 seems to come up at about half that of the TPL9202...which at a gut level isn't that surprising given the thermal pads on the TPL9202.  Assume we use a multilayer board and the recommended layouts.  

John

  • 0
    TI__Guru**** 151306 points

    John,

    The ULN2803 has huge transistors that can handle a lot of current. However the Darlington output has a high VOL that will cause more self-heating. The ULN2803 package does not transfer heat nearly as well as PWP package.

    For 8 channels on 100% duty cycle and Ta=40C, both devices can handle 150mA per channel.
    However the TPL9202 will run cooler in this condition with good layout. (good thermal path from pad to circuit board ground plane.