Signal-line ESD protection in a 0402 footprint
The TPD1E0B04DPYT: Its defining characteristic is the 0.13pF typical capacitance at 1MHz, which keeps signal integrity intact on high-speed interfaces such as USB 2.0, HDMI, and Gigabit Ethernet. The 3.6V reverse standoff voltage lets it sit on a 3.3V rail without leakage, while the 6.7V typical breakdown and 19V clamping at 1.7A peak pulse current define the protection envelope. Housed in a 0402 (1006 Metric) package that reflows to a 2-X1SON footprint, it fits the tightest layout budgets on consumer, industrial, and telecom PCBs.
0.13pF — why it matters for high-speed buses
The 0.13pF capacitance at 1MHz is the headline number that makes this part a go-to for high-speed differential pairs and single-ended lines where added capacitive loading would degrade eye diagrams or cause timing violations. On a USB 2.0 D+ line, that capacitance adds negligible rise-time penalty; on a 100BASE-TX pair, it keeps the return loss within the mask. Compare that to a general-purpose TVS with 3pF to 5pF, which would require series termination or a redesign of the driver stage. The trade-off is that the low capacitance comes from a smaller junction area, which limits peak pulse power to 15W — fine for ESD and short-duration transients, but not for sustained surge events like lightning or power-cross.
The base product number TPD1E0B04 identifies the family, and the suffix DPYT specifies the 0402 package and tape-and-reel delivery.