What this part is — and what it does on your board
The Renesas 5X1503S-000NLGI8 is a PLL-based clock generator that takes a crystal or reference clock input and delivers three LVCMOS outputs at up to 100 MHz. The integrated PLL (yes, on-chip) means you don't need an external VCXO or a separate PLL chip to synthesize a clean clock tree — it's all in one 10-pin VFQFPN package that sits in a 2x2 mm footprint. This is a 1.8V part — supply range is 1.71V to 1.89V — so it's designed for low-voltage digital cores, not legacy 3.3V or 5V logic. If your system runs on a 1.8V rail (many modern MCUs, FPGAs, and SoCs do), this part drops straight in. The 1:3 fanout saves you a separate clock buffer, and the industrial temperature range (-40°C to 85°C) covers factory-floor gear, outdoor telecom cabinets, and solar inverters without derating.
The PLL and 100 MHz ceiling — what it buys you
The on-chip PLL multiplies a lower-frequency crystal up to the 100 MHz output without a separate PLL chip or voltage-controlled oscillator. The outputs are LVCMOS, not differential (no LVPECL, no LVDS). That's fine for single-ended clock distribution on a short PCB trace, but if your design calls for a differential clock (e.g., to an FPGA GTY transceiver), you need a different generator with CML or LVPECL outputs. The differential input/output flag in the spec is No/No — this part is strictly single-ended.
Package and mounting — what the 10-VFQFPN means for assembly
The 10-VFQFPN (2x2 mm) is a small, leadless package with an exposed pad underneath for thermal and ground connection. It's surface-mount only — no through-hole option. The exposed pad needs a proper solder paste stencil and a reflow profile; hand-soldering is possible but tricky. The 2x2 mm footprint is tight, so verify your PCB land pattern against the datasheet recommendation before layout.
Sourcing and lifecycle — what to expect
This part is listed as Active on the lifecycle status — no last-time-buy, no NRND flag. That means you can design it into a new BOM today and expect multi-year supply without a sudden EOL notice. The 5X1503 series is current production from Renesas. For a BOM freeze, this is a safe pick; no second-source hunt needed yet.