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TPS1HTC30-Q1: Safety relay replacement

Theo Keinarth
Intellectual 315 points
Part Number: TPS1HTC30-Q1
Other Parts Discussed in Thread: LM74704-Q1

Tool/software:

Hi TI Team

We always look for new/smarter ways to switch solenoids since mechanical relays have a lot of downsides. At least in DC applications. We use guided relays for safety applications an we always use 2 of those in series to achieve a SIL3 rating. 

The TPS1HTC30-Q1 looks like a promising replacement for a relay. We only have 24V DC (32V max.) and a maximum of 3 A continuous and 6A  for 1s. We mainly switch solenoids which means we have inductive loads. Is it possible to use two of these switches in series?

For revers polarity protection I would use something like the LM74704-Q1. What will happen to the second switch if the first one shuts down? 

Thank you in advance!

Regards Theo

  • 0
    TI__Expert 7701 points

    Hi Theo,

    I'm not sure I quite understand the purpose of the two being in series. However, since the first switch is being used to control the second switch, if the first one turns off, then the second one will also turn off because it will not have any power.

    Thanks,

    Rishika Patel 

  • 0 in reply to Rishika Patel
    Intellectual 315 points

    Hi Rishika

    We have a multiple 2oo3 outputs built in hardware which requires a total of 6 switches per output. this requires more than one switch to implement. This is the only way to achieve a +20 years tproof interval for a SIL3 system.

    But if this should not be a problem i will try it.

    Thanks for your Help.

    Regards Theo