156.25 MHz fixed-frequency oscillator for line-rate clocking
The LMK61E2-156M25SIAT: The 156.25 MHz frequency is a standard line rate for 10-Gigabit Ethernet (10GBASE-R) and many SERDES reference clocks, so this part fits directly into the clock tree of a switch, router, or FPGA-based line card without an external PLL multiplier.
Temperature range and package for board integration
The base product number LMK61E2 indicates the family; the suffix 156M25SIAT encodes the frequency and the 6-QFM package variant.
No official second-source or pin-compatible alternate is registered — the BOM line is single-sourced from TI.