New symbols: STTH212S and STTH212U (KiCad#1800)

* New symbols: STTH212S and STTH212U (different footprint)

* STTH212U is now an alias of S2JTR

* STTH212U is now an alias of S2JTR

Diode.dcm

@@ -1584,6 +1584,18 @@ K zener diode
 F https://diotec.com/tl_files/diotec/files/pdf/datasheets/smz1.pdf
 $ENDCMP
 #
+$CMP STTH212S
+D 1200V 2A High Voltage Ultrafast Diode, SMC
+K diode
+F https://www.st.com/resource/en/datasheet/stth212.pdf
+$ENDCMP
+#
+$CMP STTH212U
+D 1200V 2A High Voltage Ultrafast Diode, SMB
+K diode
+F https://www.st.com/resource/en/datasheet/stth212.pdf
+$ENDCMP
+#
 $CMP Toshiba_HN1D01FU
 D Ultra High Speed Switching Diode Array 2 pair Com A
 K diode

Diode.lib

@@ -1375,6 +1375,7 @@ F0 "D" 0 100 50 H V C CNN
 F1 "S2JTR" 0 -100 50 H V C CNN
 F2 "Diode_SMD:D_SMB" 0 -175 50 H I C CNN
 F3 "" 0 0 50 H I C CNN
+ALIAS STTH212U
 $FPLIST
  *D?SMB*
 $ENDFPLIST
@@ -1450,6 +1451,25 @@ X A 2 150 0 100 L 50 50 1 1 P
 ENDDRAW
 ENDDEF
 #
+# STTH212S
+#
+DEF STTH212S D 0 40 N N 1 F N
+F0 "D" 0 100 50 H V C CNN
+F1 "STTH212S" 0 -100 50 H V C CNN
+F2 "Diode_SMD:D_SMC" 0 -175 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ D?SMC*
+$ENDFPLIST
+DRAW
+P 2 0 1 8 -50 50 -50 -50 N
+P 2 0 1 0 50 0 -50 0 N
+P 4 0 1 8 50 50 50 -50 -50 0 50 50 N
+X K 1 -150 0 100 R 50 50 1 1 P
+X A 2 150 0 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
 # Z1SMAxxx
 #
 DEF Z1SMAxxx D 0 40 N N 1 F N