BAT54SLT1G

BAT54SLT1G is an onsemi dual Schottky barrier diode in a SOT-23 package, rated at 30 V reverse voltage and 200 mA forward current with a typical forward voltage of 0.35 V — for clamping, steering, detection and level translation in signal circuits. The internal connection is the whole specification here: the S code is the series pair — two diodes connected in series inside one SOT-23 — and it must not be treated as a common-cathode part; the common-cathode sibling is BAT54C and the common-anode is BAT54A, and substituting one letter for another silently rewires the circuit node. Selection advice: verify the letter against your schematic symbol before ordering, especially where a design was originally drawn around a dual-diode footprint without the connection being re-checked at BOM release. Order the T1G code: onsemi lists the same device without the G suffix as Obsolete, so BAT54SL alone is a dead ordering form. Schottky forward drop is temperature-sensitive — at high junction temperature the 0.35 V typical drops further while leakage climbs, which matters in precision clamp applications. Parameters verified against onsemi documentation.