0.27 pF — the signal-integrity number that decides the fit
The TPD4E02B04DQAR is a four-channel Zener-type TVS diode array from Texas Instruments, packaged in a 10-USON (2.5x1 mm) footprint. Its 0.27 pF typical capacitance at 1 MHz is the headline parameter for HDMI port protection — low enough to keep the TMDS differential pair eye diagram open at 6 Gbps (HDMI 2.0) and 12 Gbps (HDMI 2.1) without adding measurable jitter.
Bidirectional clamping at 3.6 V standoff
Each of the four bidirectional channels clamps at 8.8 V typical peak pulse current (5 A, 8/20 µs waveform), with a reverse standoff of 3.6 V max. Peak pulse power is rated at 17 W, sized for IEC 61000-4-2 level 4 ESD strikes (8 kV contact, 15 kV air) common on HDMI connector pins. The 10-USON package with a 0.50 mm pitch keeps the trace stub short — critical for maintaining the controlled 100 Ω differential impedance on the HDMI lane.