Circuit to protect Saleae input from high voltages
It looks to be a Fairchild BZX84-C3V6 Zener diode. 

So the circuit is like this (per channel): 







simulate this circuit &ndash; Schematic created using CircuitLab

The resistors appear to be 1206 types, which would be inadequate to withstand +30V continuously (about 1.5W dissipation).