WHSM48702P2 10GBASE-T 4PPoE LAN Transformer

The WHSM48702P2 is specified for 1200 mA of DC balance current per magnetic channel, and 2400 mA for one Ethernet port, which the datasheet calls full channels. The WHSM48702P2 is a dual-port device whose two ports are independent and each counted at 2400 mA, so that total is not a device-level limit and is not multiplied by the coil count.

Size the copper against 1200 mA in each centre-tap path and take 2400 mA into the port-level thermal budget. No IEEE 802.3 clause and no PoE class name is printed for the WHSM48702P2, so its power class cannot be inferred from the current figures. Other parts are listed in the 10G BASE-T range.

No – the 0 °C to +70 °C range of the WHSM48702P2 is a component temperature limit that already includes the part's own temperature rise. The datasheet marks that line "Inclued The Temperature Rise", so +70 °C is not an ambient ceiling and no further rise allowance may be stacked on top of it.

Run the equipment at full load in the target enclosure, measure the component temperature of the WHSM48702P2 and keep it inside that limit. Storage is quoted separately as -40 °C to +85 °C.

Choose the WHSM48702P2 when the port has to pass current through the centre taps, and the WHSM48701G when it does not. Both are 48-pin dual-port 10G BASE-T surface-mount parts sharing DCR, segmented insertion and return loss, crosstalk, common-mode rejection, hipot condition and operating range.

Two things separate them: the WHSM48702P2 quotes 1200 mA of DC balance current per channel where the WHSM48701G quotes none, and its 120 µH min open-circuit inductance is measured under a 21 mA DC bias where the WHSM48701G states the same 120 µH min with no bias. A biased OCL figure is closer to the inductance you actually get once current flows, so the two numbers are not directly comparable.