BTV58-1000R Gate Turn Off (GTO) Thyristor by Philips. Package: TO-220 Download Philips BTV58-1000R datasheet: Unusual device that can be turned on or off via the gate.... not a normal thyristor. Status: RNOS (Rare New Old Stock) as these were replaced by IGBT. Tested components: No...unable to test unless under load. Using a "PEAK" DCA 75 will give a two diode with common anode result, Using a "PEAK" atlas SCR tested will give "no SCR or TRIAC detected" RoHS compliant: no