ISO7741: ISO7741FB

Part Number: ISO7741

Hello
I am looking for information about the prefix in ISO7741. Can you tell me what is the difference between ISO7741DWR and ISO7741FBDWR?

  • Hi Michal,

    Thank you for reaching out. The two letters 'F' and 'B' added to ISO7741DWR mean two different things, please allow me explain.

    Absence of 'F' in device part number indicates the device has a default output of HIGH while the presence of 'F' indicates, the default output state of device is LOW. For example, ISO7741DWR is a default HIGH device while ISO7741FDWR is a default LOW device.

    The letter 'B' in the part number indicates that the device is a basic isolation version of reinforced isolation device. For example, ISO7741DWR supports reinforced isolation with 12.8kV surge performance while ISO7741BDWR supports basic isolation with 9kV surge performance.

    Hence, ISO7741FBDWR is a device with a default state of LOW and only supports basic isolation while ISO7741DWR is a device with default HIGH state supporting reinforced isolation.

    For more details, please refer to the below FAQ. Thanks.

    https://e2e.ti.com/support/isolation/f/isolation-forum/719547/faq-how-do-i-read-ti-s-digital-isolator-part-numbers?


    Regards,
    Koteshwar Rao