125 MHz low-jitter oscillator — timing-tree anchor
The Texas Instruments LMK61A2-125M00SIAR is a high-performance, low-jitter oscillator delivering a fixed 125 MHz output. It is designed for clock-tree applications where phase noise and jitter budgets are tight — think 10 GbE switch reference clocks, FPGA transceiver reference inputs, or ADC/DAC sampling clocks that cannot tolerate spurious energy in the signal band. Housed in a 6-QFM (7x5) package, the device occupies a compact footprint on the board. The surface-mount package suits automated assembly lines, and the Tape & Reel (TR) delivery format is standard for volume pick-and-place.
The device is ROHS3 Compliant, which means it meets the current EU RoHS exemption limits without requiring an exemption certificate. No additional compliance paperwork is needed for shipping into RoHS-regulated markets.
Package and board-fit for the layout engineer
The 6-QFM (7x5) package measures 7 mm × 5 mm with a 0.65 mm pitch on the perimeter pads. The exposed thermal pad on the bottom side should be soldered to a ground-plane copper pour for thermal relief — the datasheet's recommended land pattern keeps the pad's solder paste coverage uniform and avoids tombstoning during reflow. Surface-mount assembly with a standard lead-free profile works; the package is compatible with JEDEC MSL level 1 or 2 (verify the specific MSL rating on the reel label). No bake-out required before reflow if the moisture-barrier bag is intact.