38 MHz PLL with integrated VCO — what it buys you
The Texas Instruments CD74HCT4046AMT is a single-circuit phase-locked loop (PLL) with an on-chip voltage-controlled oscillator (VCO), built in 74HCT CMOS logic. It accepts CMOS-level inputs and delivers CMOS-level outputs, running from a 4.5 V to 5.5 V supply rail. The VCO can be swept up to 38 MHz, which sets the practical upper bound for the PLL's capture and lock range. The 1:4 input-to-output ratio means one reference input can drive four phase-detector outputs — useful for distributing a clean clock or synchronizing multiple local oscillators from a single source.
Military temperature range — not just industrial
Rated from -55°C to 125°C operating, this part crosses into military/defense territory. That makes it a candidate for avionics black boxes, satellite power-conditioning loops, or downhole instrumentation where the ambient hits 105°C+ and the junction needs headroom. The 16-SOIC package (3.90 mm body width) is a standard surface-mount footprint, so board layout is straightforward — no exotic pad geometry required.
Active lifecycle — no end-of-life clock ticking
Marked as Active with ROHS3 compliance, so there is no LTB window to chase, no last-buy deadline. For a BOM line that needs a PLL with a VCO in a 5 V system, this part is safe to qualify into production without worrying about a sudden obsolescence notice. The 74HCT family has broad distribution, so supply is generally stable — no allocation-era panic needed here.
Sourcing and fit for the BOM
This is a current-production, widely stocked part in the 74HCT logic family.