Rail-to-rail steering diode for high-speed signal protection
The Texas Instruments TPD2E1B06DRLR is a two-channel steering (rail-to-rail) ESD protection diode in a SOT-5X3 package. It shunts ESD current from the signal line to the supply rails rather than to ground, which keeps the clamping voltage referenced to the IC's own supply — a topology preferred for USB, HDMI, and other high-speed differential pairs where added capacitance from a standard TVS would eat into the signal eye. Each channel is bidirectional, so the same device works on both lines of a differential pair without worrying about polarity. The reverse standoff voltage is rated at 5.5V maximum, meaning the device stays off the line until the signal exceeds that level. With a minimum breakdown of 7V and typical clamping at 15V, it protects 3.3V and 5V logic I/O banks without conducting during normal operation. The 35W peak pulse power rating (8/20µs waveform) covers IEC 61000-4-2 level 4 ESD strikes, though it is not intended for power-line surge protection — the spec explicitly flags no power line protection.
Clamping voltage and standoff — matching to your signal rail
The 5.5V reverse standoff is the key number for BOM fit. If your protected line runs at 3.3V or even 5V nominal, the TPD2E1B06 stays invisible — no leakage, no loading. But if you have a 12V or 24V signal bus (RS-485, CAN, industrial sensor input), the 5.5V standoff means this device will clamp during normal operation and fail. For those rails you need a higher-voltage TVS. The 7V minimum breakdown gives about 1.5V of headroom above a 5.5V rail, which is tight but workable for a clean 5V supply with less than 10% ripple.
The SOT-5X3 (also listed as SOT-563 or SOT-666 compatible) is a six-lead package. Mounting is surface-mount only. Cut Tape (CT) is available for prototyping or small-batch builds. Standard reel quantities apply — confirm at quote time.
That means no last-time-buy pressure and no forced redesign for the foreseeable future. The base product number TPD2E1B06 covers the whole family, so if you need a different package variant or tape quantity, the same die is available across the series.