Transceptores RF

VSC7158HT-03 - Octal 10/100 Ethernet PHY | Analog Devices

The Analog Devices Inc. (formerly Maxim Integrated) VSC7158HT-03 is a high-performance 8-port Fast Ethernet PHY transceiver supporting 10BASE-T and 100BASE-TX, packaged in a surface-mount IC form factor for managed switch and router line-card applications. The device integrates eight independent physical-layer blocks, each capable of full-duplex 100 Mb/s operation with auto-negotiation and auto-MDI/MDIX crossover, while consuming low per-port power typical of CMOS PHY designs. A Fast Ethernet PHY (Physical Layer Device) is the lowest layer of the OSI networking stack; it converts parallel digital MAC-side data into serialized analog symbols transmitted over copper twisted-pair cabling, while recovering the clock and decoding incoming symbols on the receive side. The PHY sits beneath the MAC (Media Access Controller) and above the magnetics/transformer interface, forming the bridge between digital logic and the analog copper channel. For 100BASE-TX, the line code is 4B/5B MLT-3 over Cat-5 cable; for 10BASE-T, Manchester encoding is used on the same physical medium. Multi-port PHYs integrate several of these transceivers into one package, simplifying PCB layout and BOM for managed switches. Key features of the VSC7158HT-03 include integrated termination, baseline wander compensation, on-chip transmit waveform shaping, and per-port link/status LEDs. It exposes a Media Independent Interface (typically MII or RMII) toward the MAC, and supports standard 802.3u Clause 28 auto-negotiation. The device is designed for non-blocking 8-port switching fabrics in workgroup switches, NICs, and embedded networking platforms. Architecturally, the part uses mixed-signal CMOS with embedded DSP-based echo and crosstalk cancellers. Its multi-port integration eliminates the need for eight discrete PHY ICs, reducing board area, BOM cost, and the FPGA/CPLD glue logic typically associated with dispersed PHY designs. Designers can therefore achieve higher port density in 1U rack-mount switches without redesigning the analog front end. Typical applications include 8-port workgroup Ethernet switches, router LAN interfaces, industrial Ethernet bridges, network interface cards, and IP surveillance switching planes. Its per-port low power also suits fanless embedded networking appliances. When designing with this part, verify reference clock quality, magnetics isolation, and proper 50 Ω-impedance routing on the MII bus. Because the part is mature and distribution-constrained, validate long-term availability before committing to new designs. This page synthesizes distributor pricing, lifecycle status, application context, and practical design considerations that are not consolidated on any single distributor listing for the VSC7158HT-03.