Is there any other MOSFET that can be used as the external switch with an LTC4279 PoE PSE controller? The data sheet strongly pushes the Nexperia PSMN075-100MSE and PSMN040-100MSE as the only choices, and they're out of stock worldwide for 6 to 16 months, and the parameters that lead to these choices aren't explained. I'd love to use something generic like an IRF540NS as the switch, if I could. They're a little large but they're cheap and plentiful, have an even lower Rds(on) than the Nexperia parts, and seem like far more than enough to safely switch a Type 2 PoE load (half an amp), unless the PoE negotiation depends on very specific magic. But the data sheet makes it very clear that I'm not qualified to choose.