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OPA2991: make a PCB with dual footprint compatible for VSSOP DGK 5x3mm and DCU 3x2mm?

AnBer
Mastermind 29380 points
Part Number: OPA2991
Other Parts Discussed in Thread: OPA2171,

Team,

Can a PCB be made compatible to either be fitted it with a OPA2991 VSSOP DGK 5x3mm or OPA2171 VSSOP DCU 3x2mm?
The idea is to be able to place both footrprint on the same PCB side (DCU outline within the DGK outline)?

Is it possible? Will it meet standard manufacturing rules?

Thanks in advance,

A.

  • 0
    TI__Mastermind 23310 points

    Hi A,

    We can't say whether or not it will meet standard manufacturing rules since I don't think there's a determined "standard" across the PCB manufacturing industry. 

    The biggest problem the customer would face would be that the pin pitches between the packages are different, with DGK having a 0.65mm pitch and the DCU having a 0.5mm pitch. Here's what they look like when I over-layed the footprints on top of each other in Altium.

    I doubt any PCB manufacturer would allow for this level of tolerance. That said I would recommend designing around a 10 pin VSSOP package called DGS. The DGS has a pin pitch of 0.5mm. While the two additional pins are for the shutdown feature, the rest of the pinout matches the DCU! Notice the footprint below has the pins lining up! 

    The OPA2991S in a DGS package would be what I would recommend. You can leave the shutdown pins floating or tied to VEE to enable the amplifier. 

    Let me know what you think about this idea. 

    Best Regards,

    Robert Clifton