The TI LMK61A2-125M00SIAT is a 125 MHz clock oscillator in a 6-QFM (7x5) surface-mount module. It's a drop-in reference clock for Ethernet PHYs, FPGAs, or networking SoCs that need a clean 125 MHz source. The 3.135V to 3.465V supply range means it runs happily off a 3.3V rail with ±5% tolerance — common in PoE switches and baseband cards. At 152 mA supply current, budget that into your power tree; it's not a low-power oscillator, but for a precision fixed-frequency part that's expected.
Industrial temperature grade — outdoor and enclosure fit
No derating worry for most line-card environments; the 85°C ceiling covers the majority of sealed enclosures with moderate airflow.