The 78Q2123/78Q2133 are 10/100BASE-TX Ethernet transceivers from Teridian Semiconductor Corporation. They support Category-5 unshielded twisted pair (Cat-5 UTP) and Category-3 unshielded twisted pair (Cat-3 UTP) cables and comply with IEEE-802.3 standards.
This data sheet describes the 78Q2123 and 78Q2133 MicroPHY 10/100BASE‑TX Ethernet transceivers, the smallest devices of their class. It covers functional description, power‑management modes, clock generation, auto‑negotiation, and signal‑quality features aimed at embedded applications such as game consoles, modems, printers and set‑top boxes.
The document also provides electrical specifications, pin‑out tables, register maps, recommended PCB land‑pattern dimensions, ordering numbers and revision history, allowing designers to integrate the part into their hardware designs with confidence.
| Package | 32‑QFN (5 × 5 mm) |
|---|---|
| Supply Voltage | Single 3.3 V (+0.3 V) |
| Power Consumption | ~290 mW (Low Power) |
| Temperature Range (78Q2123) | 0 °C to 70 °C |
| Temperature Range (78Q2133) | -40 °C to 85 °C |
The transceiver operates from a single 3.3 V (+0.3 V) supply.
Three power‑saving modes are supported: chip power‑down, receive power management, and transmit high‑impedance mode.
The device is offered in a 32‑pin QFN package measuring 5 mm × 5 mm.
The commercial version (78Q2123) is rated 0 °C to 70 °C, while the industrial version (78Q2133) is rated -40 °C to 85 °C.