It turns out the NCP1406SNT1G is [no longer manufactured](https://www.digikey.com/en/products/detail/onsemi/NCP1406SNT1G/1483403?s=N4IgTCBcDaIHIGEAKBGALABgGwGU4BUUBxEAXQF8g). Any suggestions on a replacement part?