FAQ
Frequently Asked Questions
Over what frequency range must a 10G transformer hold its specifications?
Parts in this family are generally specified to 500 MHz — twice the ceiling of the2.5G/5G familyand several times that of the Gigabit family.
The port structure is the same as a Gigabit part, so only the frequency ceiling distinguishes the rate grades, not the structure. The wider band means every high-frequency item has to hold its limit across more spectrum — an additional constraint, not a relaxation. Neither a Gigabit nor a 2.5G/5G part can stand in for one here, however identical the package. The family is listed in the10G BASE-T range.
Does the 10G family include any through-hole parts?
No. All 16 parts in this family are surface-mount, one of them low-profile.
It is the only data-rate family in this category with no through-hole option at all. The implication for production is direct: boards using these parts have to be reflowed and cannot be wave-soldered. Where mechanical, serviceability or process convention requires a through-hole part, there is currently nothing at 10G to match, and that belongs in the discussion at concept stage. Choice is thin in the2.5G/5G familytoo. Parts are listed in the10G BASE-T range.
How are cross talk and common-mode rejection stated in the 10G family?
Several parts quote them as Typ rather than Min, over a test band much wider than theGigabit family's.
Both differences have to be read together: the qualifier changes from a guaranteed floor to a typical value, and the band widens several times over. A Typ figure should not be used as a guaranteed boundary in worst-case analysis, and tabulating these numbers alongside Gigabit parts quoting Min usually leads to a wrong conclusion. Where a project needs a guaranteed limit at a specific frequency, tell us the band and the criterion. Parts are listed in the10G BASE-T range.
How much PoE current does the 10G family support?
It reaches the high four-pair current grades, with the top two grades well above what is common in the Gigabit family, and it is the only family here using a PoE++ designation.
Of the 16 parts, 9 carry no power capability and the rest spread across PoE+ and several four-pair current grades. High current and high bandwidth appearing together is not a coincidence — 10G ports are common on wireless access points and aggregation equipment, where a port often has to carry both. Settle the IEEE class first, then check whether the figure describes one path or the group. Grades are shown per part in the10G BASE-T range.
What port counts does the 10G family offer?
13 single-port and 3 dual-port parts, with nothing above two ports.
Pin counts are mostly 24, with the dual-port parts at 48 and one part at 30. Where a design needs four or more ports, this family currently has nothing to match — a clear contrast with theGigabit family, which holds more than a dozen quad-port parts. 10G ports are usually uplink or aggregation ports and few in number. Designs needing several of them normally use multiple single- or dual-port devices, so allow for board area and routing space at layout. Parts are listed in the10G BASE-T range.
