170 V Schottky — the headroom decision
The STMicroelectronics STPS10170CT is a 170 V, 5 A Schottky rectifier in a common-cathode dual-diode configuration, housed in a TO-220-3 through-hole package. The 170 V reverse voltage rating is the defining spec — it puts this part in the 48 V to 60 V bus space where a 100 V Schottky would leave no margin for inductive kickback or load-dump transients. The 5 A average current per diode (10 A total for the pair) suits output rectification in medium-power switch-mode supplies, OR-ing diodes in redundant power architectures, and freewheeling clamps in motor drives where the voltage rail exceeds 48 V.
920 mV forward drop — the loss trade-off
Forward voltage sits at 920 mV at 5 A per diode — higher than a low-voltage Schottky, but that is the price of the 170 V blocking capability. The 10 µA reverse leakage at 170 V is typical for this voltage class and junction size. The fast recovery characteristic (≤ 500 ns, > 200 mA) is inherent to Schottky technology — no stored charge, so switching losses stay low in continuous-conduction-mode converters.
Obsolete — the sourcing reality
For sustainment of existing BOM lines, procurement should expect to source through independent distribution on a quoted-to-order basis.