Low-capacitance ESD clamp for HDMI and high-speed ports
Its 0.5 pF capacitance at 1 MHz keeps signal integrity intact on interfaces like HDMI, where every picofarad of added load closes the eye diagram. The part clamps a 2.5 A peak pulse (8/20 µs waveform) to 8.9 V maximum, with a reverse standoff voltage of 3.6 V.
0.5 pF — why it matters for the signal path
At 0.5 pF (measured at 1 MHz), this diode adds negligible capacitive loading to a differential pair. For HDMI 1.4/2.0 data rates (up to 6 Gbps), a protection diode with even 1 pF can cause enough rise-time degradation to fail the compliance test. The 0.5 pF figure keeps the designer on the safe side of the HDMI specification's additive capacitance budget. If you are protecting a USB 3.0 or DisplayPort lane, the same reasoning applies — the lower the capacitance, the less the signal suffers.
Package and footprint: 0402 / 2-X1SON
The TPD1E04U04DPYT comes in a 0402 (1006 Metric) case, also described as a 2-X1SON package measuring 1.0 mm x 0.6 mm. That is a two-pin device with a tiny land pattern — the sort that fits directly behind an HDMI connector or alongside a USB-C receptacle where board real estate is measured in square millimetres. Surface-mount assembly is standard, but the small pad geometry demands a tight solder-paste stencil aperture and a reflow profile matched to the small thermal mass.
The base product number is TPD1E04U04, so any future package or tape-and-reel variant will share the same die and electrical characteristics — good for cross-referencing inventory.