0.13 pF at 1 MHz — the spec that makes this an RF part
Its defining characteristic is the 0.13 pF capacitance at 1 MHz — an order of magnitude lower than general-purpose ESD diodes, which would load and detune a 2.4 GHz or 5 GHz antenna feed. The 15 W peak pulse power rating (8/20 µs waveform) handles the energy from IEC 61000-4-2 ESD strikes at ±8 kV contact and ±15 kV air, typical for the application class. The 3.6 V reverse standoff voltage and 6.7 V typical breakdown voltage protect 3.3 V signal lines without clipping normal RF levels.
Package and footprint — 2-X2SON at 0.6 x 0.3 mm
Housed in a 2-X2SON package (0.6 x 0.3 mm, 0201 metric footprint), this part is sized for the tightest antenna matching networks and miniaturized wireless modules. The surface-mount package supports standard reflow soldering. The tiny footprint means the PCB layout engineer must pay attention to the keep-out zone under the antenna trace — the 0.13 pF load is already accounted for, but stray capacitance from a ground pour under the pad would shift the match.
For procurement, this means no urgency to source an alternate for production continuity. There is no official second-source or pin-compatible replacement listed — the 2-X2SON footprint is specific to TI's TPD1E family, so dual-sourcing would require requalifying a different package or supplier.