BASE 2,5G/5G-T

The port structure is the same; the difference is test bandwidth — parts here are generally specified to 250 MHz where mostGigabit partsstop at 100 MHz.

Both use four channels across two pairsets per port, so counting transformer units will not tell them apart; the frequency ceiling on the datasheet will. The wider band is not a relaxed specification but an additional requirement the higher data rate imposes. A Gigabit part cannot stand in for one here, even with an identical package and pinout, because its performance was never tested above 100 MHz. The family is listed in the2.5G/5G BASE-T range.

Typ is a typical value and Min is a guaranteed floor; they cannot be compared as like for like, and a Typ figure should not go into a worst-case budget as a guaranteed boundary.

Several parts in this family quote cross talk and common-mode rejection as Typ, where theGigabit familygenerally quotes Min. Two differences have to be read together: the qualifier changes, and the test band more than doubles, so the numbers can look similar while meaning something different. Where a project needs a guaranteed limit at a specific frequency, tell us the band and the criterion. Parts are listed in the2.5G/5G BASE-T range.

14 single-port, 8 dual-port and 1 quad-port; the packages are predominantly surface-mount, with only two through-hole parts.

Pin counts concentrate at 24 and 48, plus one 96-pin quad-port part. The scarcity of through-hole options is worth knowing early — where process or mechanical constraints force a through-hole part, the choice here is very narrow, and it is better settled before layout than after. Two low-profile parts are available for height-constrained designs, though the low-profile option generally carries fewer capability grades. The full list is in the2.5G/5G BASE-T range.

Commercial and industrial wide-temperature grades split the family almost evenly, while isolation is the same grade on every part.

Temperature is therefore the item genuinely worth selecting on here, and isolation is not a selection variable. Where a safety clause calls for more than the standard isolation level, this family currently has no matching part. The share of wide-temperature parts is noticeably higher than in theGigabit family; the cold end still matters, since commercial grade starts at 0 °C. Grades are listed per part in the2.5G/5G BASE-T range.

It runs from no power capability through to four-pair power, and the proportion of parts with power capability is higher than in theGigabit family.

Of the 23 parts, around four in ten carry no power capability, and the rest spread across standard PoE, PoE+ and several four-pair current grades. Multi-gigabit ports appear heavily on wireless access points, high-definition surveillance and access switches, which are powered-port applications by nature. Selection still runs IEEE class first, current figure second, with a check on whether the figure describes one path or the group. Parts are listed in the2.5G/5G BASE-T range.