diff --git a/ic/usb-serial_ch340.yaml b/ic/usb-serial_ch340.yaml
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+name: CH340
+# not variations are defined here
+variations: E
+description: transceiver, USB to serial
+datasheet: http://www.wch-ic.com/downloads/file/79.html
+distributors: LCSC C99652
+
+pinout@E:
+  USB:
+    UD+: 1
+    UD-: 2
+  TNOW: 6
+  CTRL:
+    RTS: 4
+    CTS: 5
+  UART:
+    TXD: 8
+    RXD: 9
+  POWER:
+    VCC: 7
+    V3: 10
+  GND: 3
+
+properties:
+  bidir: USB
+  in: RXD, CTS
+  out: TXD, RTS, TNOW
+  power: POWER
+  ground: GND
+
+schematic@E:
+  symbol: ic
+  left: USB, TNOW
+  right: UART, CTRL
+  top: POWER
+  bottom: GND
+
+housing@E: # MSOP-10, dimensions from diodes MSOP-10 datasheet
+  suffix: E
+  pattern: SOP
+  bodyWidth: 3.0 # E1
+  bodyLength: 3.0 # D
+  height: 1.1 # A
+  leadSpan: 4.9 # E
+  leadWidth: 0.2 # b
+  leadLength: 0.6 # L
+  leadCount: 10
+  pitch: 0.5 # e