What the # between SLA7073 MR and SLA7073MPR .I take note the externa look like the same. Can be compatible?
But when I replace in the board can't work? .The label external is the same SLA7073MR why?
These parts have similar pinouts and voltage/current ratings. However they appear to be slightly different functionally with different style output. I would recommend to reference the two datasheets listed below.
Output Configuration Half Bridge, (2) Dual
Datasheet - http://www.semicon.sanken-ele.co.jp/sk_content/sla7070mprt_ds_en.pdf
Output Configuration Low Side Driver, (4) Quad
Datasheet - http://www.allegromicro.com/en/Products/Sanken-Products/Sanken-ICs/Sanken-Motor-Driver-ICs/Sanken-Stepper-Motor-Unipolar-Driver-ICs/~/media/Files/Sanken/Datasheets/SLA7070M-SLA7071M-SLA7072M-SLA7073M-Datasheet.ashx
Here's a note from page 2 of the datasheet, the R or PR refers to internal circuitry.