BAS40L 40V Small Signal Schottky Diodes Vishay Semiconductors BAS40L Small Signal Schottky Diodes features very low turn-on voltage and fast switching in a leadless ultra small DFN1006-2A package. A PN junction guard ring protects the BAS40L against excessive voltage, such as electrostatic discharges. The Vishay BAS40L Small Signal Schottky Diodes deliver more reliable power dissipation than SOT-23. The Vishay BAS40L Diodes are offered in a surface-mounted device (SMD) plastic package with visible and sidewall plated / wettable flanks.