RF synthesizer with integrated VCO — 1.77 GHz ceiling
The LMX2531LQ1700E/NOPB is a PLL-based frequency synthesizer with an integrated VCO, targeting RF local-oscillator or clock-generation applications up to 1.77 GHz. The 1.77 GHz maximum output frequency sets the upper bound for the carrier or LO — if your system needs a clean synthesised clock above that, this part hits the ceiling. The CMOS output drives standard digital loads directly; no external level translation needed for a typical baseband or FPGA reference input. Supply range is 2.8V to 3.2V, which aligns with common 3.0V or 3.3V rails in RF and mixed-signal designs. The single-circuit PLL with a 2:2 input-to-output ratio means two clock inputs selectable and two outputs — useful for redundant reference or dual-band synthesis without an external mux.
Sourcing posture — active production, no direct second-source
The CD74HCT7046AE is a through-hole PLL from a different family (74HCT, 38 MHz max) and is not a functional substitute for this RF synthesizer; the frequency and package gap is too wide. Availability is confirmed per RFQ — no stock-holding claim here, but the active lifecycle means franchised distribution channels carry it. If you are filling a BOM line, quote against your quantity; the part is not in allocation distress based on its current status.
Package and thermal — 36-WQFN exposed pad
The 36-WFQFN with exposed pad — supplier device package 36-WQFN (6x6 mm) — demands a thermal-land pattern on the PCB. Surface-mount only; no through-hole variant exists.