Obsolete — what this means for the BOM line
The STD170N4F7AG is marked obsolete by STMicroelectronics. For a production BOM that already specifies this part, the procurement path is the surplus and independent-distribution channel.
Automotive-grade parametrics
Switching and drive considerations
Gate charge is 63 nC at 10V, with an input capacitance of 4350 pF at 25V Vds. The 10V drive voltage is specified for minimum Rds(on); at lower gate voltages the on-resistance climbs significantly, so a gate driver rail of at least 10V is assumed in the original design. The ±20V maximum gate-source rating provides margin for ringing on long gate traces, but a gate resistor is still advisable to damp the 4350 pF input capacitance.