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AM26LV31E: MIL-STD-461G Conformance

Raghavendra Babu1
Prodigy 70 points
Part Number: AM26LV31E
Other Parts Discussed in Thread: AM26LV32E,

Hello Concern,

I have used AM26LV31E & AM26LV32E in my designs. I want to know whether these components are complied with either MIL-STD-461G or DO-160G standards? Especially Lightening tests, where Multiple stroke voltages & currents will be  induced on the cable bundle of RS422. Please suggest. Our design is refers to the Internal Equipment Levels in the table below.

Thanks & Regards,

Raghavendra

  • 0
    TI__Mastermind 22965 points

    Hi Raghavendra,

    Can you repost the image? It didn't show up.

  • 0 in reply to Ravi Singh
    Prodigy 70 points

    Hi Ravi,

    Please find below.

    Multiple Stroke

     

    Applicability

     

    Test Description

    Internal

    Equipment Levels**

    External

    Equipment Levels**

     

     

     

     

     

    All equipment installations

     

     

     

     

    Waveform 2 (WF2)/ Waveform 1 (WF1)

    First Stroke

    VL = 300 V (WF2) IT = 600 A (WF1) IT = 60 A*

    Subsequent Strokes VL = 150 V (WF2) IT = 150 A (WF1)

    IT = 30 A*

    First Stroke

    VL = 750 V (WF2) IT = 1500 A (WF1) IT = 150 A* Subsequent Strokes VL = 375 V (WF2) IT = 375 A (WF1)

    IT = 75 A*

     

     

     

     

     

    All equipment installations

     

     

     

     

    Waveform 3 (WF3) –

    1 MHz and 10 MHz

    First Stroke

    VT = 600 V (WF3) IL = 120 A (WF3) IL = 24 A*

    Subsequent Strokes VT = 300 V (WF3) IL = 60 A (WF3)

    IL = 12 A*

    First Stroke

    VT = 1500 V (WF3) IL = 300 A (WF3)

    IL = 60 A* Subsequent Strokes VT = 750 V (WF3) IL = 150 A (WF3)

    IL = 30 A*

     

     

     

    Equipment installations routed in areas with composite skin/structure.

     

     

     

     

    Waveform 4 (WF4)/ Waveform 5A (WF5A)

    First Stroke

    VL = 300 V (WF4)

    IT = 1000 A (WF5A)

    IT = 300 A*

    Subsequent Strokes

    VL = 75 V (WF4)

    IT = 200 A (WF5A)

    IT = 150 A*

    First Stroke

    VL = 750 V (WF4)

    IT = 2000 A (WF5A)

    IT = 750 A*

    Subsequent Strokes

    VL = 187.5 V (WF4) IT = 400 A (WF5A) IT = 375 A*

    Multiple Burst

     

    Applicability

     

    Test Description

    Internal

    Equipment Levels**

    External

    Equipment Levels**

     

    All equipment installations

    Waveform 3 (WF3) –

    1 MHz and 10 MHz

    VT = 360 V (WF3) IL = 6 A (WF3)

    VT = 900 V (WF3) IL = 15 A (WF3)

    Equipment installations that utilize short, low

    impedance cable bundle installations.

     

     

    Waveform 6 (WF6)

     

    VL = 600 V (WF6) IT = 30 A (WF6)

     

    VL = 1500 V (WF6) IT = 75 A (WF6)

    Notes:

    *These current levels are intended for individual power leads or low count wire bundles. When multiple leads are tested together, this current shall be increased to the full bundle level or to the number of leads multiplied by the appropriate individual current test or limit level, whichever is less.

    **Amplitude Tolerance is +20%,-0% for all waveforms, except the tolerance is relaxed to +50%,-0% for the Subsequent Strokes. VT represents the test voltage level in volts and IT represents the test current

    level in amperes. VL (volts) and IL (amperes) represent limits intended to prevent over-stressing the EUT

    beyond the requirements.

    Regards,

    Raghavendra

  • 0 in reply to Raghavendra Babu1
    TI__Mastermind 25705 points

    Raghavendra,

    Are these stroke equipment level? Do you know what the stroke looks at the IC pins? These two devices are rated for IEC61000-4-2 standard, which stroke duration is in 100ns.

    Regards,

    Hao

  • 0 in reply to Hao L
    Prodigy 70 points

    Hao,

    We would be injecting transients on shielded cable. But, I'm not sure about the transient levels reaching the device Pin. We are using TVS to protect the interface/device in our design. But, not sure whether TVS can save the device or not.

    We have to impose cable injection lightning requirements of MIL-STD-461G CS117. The severity of the strokes are given below.

       

       

    -Raghavendra

  • 0 in reply to Raghavendra Babu1
    TI__Mastermind 25705 points

    Raghavendra,

    Thanks for your information. I understand the severity of the strikes, however how much energy reaches the IC pins depending on several factors like the cable impedance, device input impedance, capacitor between the shield and the wire, capacitor of the wire. Maybe you can do some rough estimate based on a simplified schematic. After that, you might be able to choose the proper TVS diode. Here are some reference about diode selection.

    www.ti.com/.../slvae37.pdf

    e2e.ti.com/.../how-to-choose-a-tvs-diode-for-rs-232-rs-485-and-can-based-on-voltage-ratings

    Regards,

    Hao