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BAT54S,215

Input clamp: VIN held between GND-0.3V and 3V3+0.3V ahead of the buffer

That description comes from one board. A passive of this value does a different job on each design — see the per-board component tables below for what it does in each context.

Nexperia Used on 3 boards 3 placements
ValueBAT54S
Manufacturer partBAT54S,215
ManufacturerNexperia
FootprintPackage_TO_SOT_SMD:SOT-23
KiCad symbolDiode:BAT54S
Datasheethttps://assets.nexperia.com/documents/data-sheet/BAT54_SER.pdf ↗

Where it is used

BoardNameReferences
AXL-002 Oscilloscope front end dual-PMOD module (AD9280) D1
AXS-030 Piezo contact mic PMOD module D1
AXS-045 MQ-series combustible-gas carrier PMOD module D1