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SN65176B: The AMR value for both pin6 (A) and Pin7(B)

Ken Zhang
Expert 3865 points

Part Number: SN65176B
Other Parts Discussed in Thread: THVD2410

Tool/software:

Hi,

  1. I understand that the AMR for both A and B pin,with respect to Pin5. are -10 to 15V, is it right?
  2. Are there  differential AMR value for A-B and common AMR value for (A+B)/2?

  • 0
    Guru 325520 points

    1. Yes.

    2. No; all combinations of voltages at the A/B pins are allowed.

  • 0 in reply to Clemens Ladisch
    TI__Expert 3865 points

    Clemens

    1. Can I understand that MAR value for the differential voltage of A-B is +-25V, and MAR value for A-B common voltage is -10v to 15V?
    2. To compete with TPT75176HL1, customer needs to know what is the differential peak voltage of A-B with pulse transient condition. such as +-100V listed in TPT75176HL1;
    4. The -29V for about 1us A-B of SN65176B is measured on customer board during lightening test, the waveform is as following in which CH2 (Green) is A-B voltage. is there risk for sn65176B?
  • 0 in reply to Ken Zhang
    TI__Guru* 81381 points

    Ken,

    our device's warranty is based on the abs max rating. -29V is larger than the abs max differential (-10V-15V=-25V). So we cannot guarantee the device will survive this. We would need to recommend the customer place a bidirectional TVS diode between the A-B pins to clamp the voltage since 1uS is actually kind of long.

    Based on what you're showing you may want to try to move the customer to our THVD24xx family which has higher abs max ratings to handle these rougher environments.

    -Bobby

  • 0 in reply to BOBBY
    TI__Expert 3865 points

    Bobby

    THVD2410/50 can meet requirement, but they are expensive. i will send email to BU to discuss a way.

  • +1 in reply to Ken Zhang
    TI__Guru* 81381 points

    Ken,

    The other alternative I can think of is to place a bi directional TVS diode between the pins to clamp the voltage. We can ask the protection devices product line for a recommendation if they can make that change (may required a PCB spin).

    -Bobby