What this 1:5 fanout buffer does on the board
The Renesas 49FCT3805DPYGI is a non-inverting clock buffer that takes one CMOS or LVTTL input and distributes it to five outputs per bank, with two independent banks on-chip. It is a straight fanout buffer — no PLL, no jitter cleaning, no internal termination — just clean single-ended clock or signal replication rated up to 166 MHz. The 1:5 ratio per circuit means a single oscillator or clock source can feed five loads without extra external buffers, saving board area and routing complexity.
Supply and logic compatibility — 3.3 V systems
The 3 V to 3.6 V supply range maps directly onto a 3.3 V rail with margin for regulation tolerance. Input and output levels are CMOS and LVTTL, so this buffer mates cleanly with 3.3 V FPGAs, ASICs, and microcontrollers without level translation.
Temperature grade and deployment environment
Rated for -40°C to 85°C, the industrial temperature range covers outdoor telecom cabinets, factory-floor PLCs, motor drives, and base-station line cards. Not qualified for automotive under-hood (no AEC-Q100 cited), but fine for cabin or controlled industrial enclosures.
Package and footprint
Housed in a 20-SSOP (5.30 mm body width, 0.209" pitch), the package is a standard surface-mount footprint shared across many Renesas 49FCT-series clock buffers. The supplier device package is 20-SSOP; the shipping medium is Tube, not Tape & Reel — factor that into pick-and-place setup if you are running a reel-fed line.
Lifecycle and sourcing posture
The 49FCT3805DPYGI carries an Active product status with ROHS3 compliance. No NRND flag, no last-time-buy notice — it remains a current-production part. For BOM planning, this means no imminent obsolescence risk.