With stand-off voltages in the 18 – 32V range and a snap-back characteristic, the AEC-Q101 (automotive) qualified parts are intended to be used close to connectors on boards.
The base part number is PESDxxVF1Byy-Q, with xx representing the nominal stand off voltage of 18, 24, 30 or 32, and yy being ‘LS’ for a 1 x 0.6 x 0.47mm DFN1006BD-2 package with side-wettable flanks for optical inspection, and ‘BL’ for a DFN1006-2 package without wettable flanks.
Picking the PESD18VF1BLS-Q almost at random, reverse stand-off is 18V at 25°C, where leakage is typically 1nA (30nA max).
Breakdown is 19V minimum and typically at 24V, after which is typically clamps to 17.5V (8A, 100ns, 25°C), or 20V for 16A. Dynamic resistance is typically 800mΩ (7.5A, 100ns, 25°C).
Capacitance is typically 0.31pF (oV, 1MHz, 25°C – 0.45pFmax), and operation is across -55 to 150°C.
Electrostatic discharge rating to IEC 61000-4-2 s 10kV for contact discharge and 15kV for air discharge.
“The device is designed for the protection of one bidirectional data line from surge pulses and ESD damage,” according to the company. “The device is suitable on lines where the signal polarities are both positive and negative with respect to ground. Snap-back behavior strongly reduces the clamping voltage to the system behind the ESD protection during an ESD event.”
It also warned: “Do not connect unlimited DC current sources to the data lines to
avoid keeping the ESD protection device in snap-back state after exceeding the breakdown voltage.”
Applications are foreseen in infotainment systems on busses including USB, HDMI, video and Ethernet.
