The Infineon BAS70B5000 is a 70 V, 70 mA Schottky barrier diode in the SOT-23-3 surface-mount package, qualified to AEC-Q101 for automotive applications. Its low forward voltage — 1 V maximum at 15 mA — and junction capacitance of 1.5 pF at 0 V make it suited for high-speed switching, reverse-polarity protection, and clamping in 12 V and 24 V automotive electronics, industrial controls, and general-purpose signal conditioning. The 70 V reverse voltage gives comfortable headroom over a 12 V rail, and the sub-100 nA leakage at 50 V keeps power loss negligible in battery-powered circuits.
AEC-Q101 — why it matters for the BOM
The BAS70B5000 carries the Automotive, AEC-Q101 series designation, meaning it has passed the stress qualification tests (temperature cycling, HTRB, H3TRB, etc.) required for production automotive electronics. For a BOM line going into an ECU, sensor module, or under-hood assembly, this qualification removes the need for a separate qualification run or waiver. The 150 °C maximum junction temperature supports operation in under-hood ambient conditions where the local temperature can reach 105 °C or higher.
Infineon lists the BAS70B5000 with an Active product status.
Package and footprint — SOT-23-3
The BAS70B5000 is supplied in the PG-SOT23-3-3 package, a standard three-lead SOT-23 footprint shared with many small-signal diodes and transistors. The surface-mount body suits automated pick-and-place and reflow assembly.