diff --git a/capacitor/c2220.yaml b/capacitor/c2220.yaml
new file mode 100644
index 0000000..1b80a7c
--- /dev/null
+++ b/capacitor/c2220.yaml
@@ -0,0 +1,13 @@
+name: C2220
+description: Chip capacitor 5.7x5 mm
+keywords: Capacitor
+
+schematic:
+  symbol: capacitor
+
+housing:
+  pattern: chip
+  bodyLength: 5.3-6.1
+  bodyWidth: 4.6-5.4
+  height: 1.8-2.2
+  leadLength: 0.25-0.95
diff --git a/connector/tab_molex_197054001.yaml b/connector/tab_molex_197054001.yaml
new file mode 100644
index 0000000..b71ac1c
--- /dev/null
+++ b/connector/tab_molex_197054001.yaml
@@ -0,0 +1,24 @@
+name: MOLEX_197054001
+description: PCB tab
+datasheet: https://www.molex.com/content/dam/molex/molex-dot-com/products/automated/en-us/salesdrawingpdf/197/19705/197054001_sd.pdf
+keywords: connector, tab
+distributors: LCSC C505008
+
+pinout:
+  TAB: 1,2
+
+properties:
+  passive: TAB
+
+schematic:
+  symbol: test-point
+
+housing:
+  pattern: custom
+  bodyWidth: 7.9
+  bodyLength: 3.0
+  height: 14.22
+  pitch: 5.08
+  holeDiameter: 1.70
+  columnCount: 2
+  rowCount: 1
diff --git a/connector/xt60.yaml b/connector/xt60.yaml
new file mode 100644
index 0000000..8373bb0
--- /dev/null
+++ b/connector/xt60.yaml
@@ -0,0 +1,33 @@
+name: XT60
+variations: M, F
+description: Amass XT60 battery connector
+keywords: connector
+distributors: LCSC C98734
+
+pinout@F:
+  +: 1
+  -: 2
+
+pinout@M:
+  -: 1
+  +: 2
+
+schematic:
+  symbol: connector
+
+housing:
+  pattern: custom
+  bodyWidth: 8.10
+  bodyLength: 15.50
+  height: 15.70
+  silkscreen: M -4.05 5.05 -1.35 7.75 1.35 7.75 4.05 5.05 # the notch on -
+
+  # pins
+  leadDiameter: 4.3
+  holeDiameter: 4.5
+  padDiameter: 6.0
+  pitch: 7.20
+  rowCount: 2
+  columnCount: 1
+  rowDX: 0
+  rowDY: 0
diff --git a/connector/xt60pw.yaml b/connector/xt60pw.yaml
new file mode 100644
index 0000000..4aa485e
--- /dev/null
+++ b/connector/xt60pw.yaml
@@ -0,0 +1,40 @@
+name: XT60PW
+variations: M, F
+description: Amass XT60 battery connector, 180°
+keywords: connector
+distributors: AliExpress 33057941704
+
+pinout@F:
+  +: 1
+  -: 2
+
+pinout@M:
+  -: 1
+  +: 2
+
+schematic:
+  symbol: connector
+
+housing:
+  pattern: custom
+  bodyWidth: 15.5
+  bodyLength: 17.2
+  height: 8.4
+
+  # pins
+  holeDiameter: 2.7
+  pitch: 7.20
+  rowCount: 1
+  columnCount: 2
+  rowDX: 0
+  columnDY: 6.75 # 17.2/2-1.85
+
+  # mounting holes
+  slotHeight1: 1.7
+  slotWidth1: 0.6
+  pitch1: 13.5
+  rowCount1: 1
+  columnCount1: 2
+  rowDX1: 0
+  columnDY1: 0.75 # 17.2/2-1.85-6
+
diff --git a/ic/can_tja1051.yaml b/ic/can_tja1051.yaml
new file mode 100644
index 0000000..2e0a357
--- /dev/null
+++ b/ic/can_tja1051.yaml
@@ -0,0 +1,102 @@
+name: TJA1051
+variations: T, T/E, T/3, TK/3
+suffix: T, T/E, T/3, TK/3
+description: CAN transceiver
+datasheet: https://www.nxp.com/docs/en/data-sheet/TJA1051.pdf
+
+pinout@T:
+  CTRL:
+    S: 8
+  TTL:
+    TXD: 1
+    RXD: 4
+  VCC: 3
+  GND: 2
+  CAN:
+    CANH: 7
+    CANL: 6
+  NC: 5
+
+pinout@T/E:
+  CTRL:
+    S: 8
+    EN: 5
+  TTL:
+    TXD: 1
+    RXD: 4
+  VCC: 3
+  GND: 2
+  CAN:
+    CANH: 7
+    CANL: 6
+
+pinout@T/3:
+  CTRL:
+    S: 8
+  TTL:
+    TXD: 1
+    RXD: 4
+  VCC: 3
+  VIO: 5
+  GND: 2
+  CAN:
+    CANH: 7
+    CANL: 6
+
+pinout@TK/3:
+  CTRL:
+    S: 8
+  TTL:
+    TXD: 1
+    RXD: 4
+  VCC: 3
+  VIO: 5
+  GND: 2
+  CAN:
+    CANH: 7
+    CANL: 6
+
+properties:
+  in: S, EN, RXD
+  out: TXD
+  bidir: CAN
+  power: VCC, VIO
+  ground: GND
+  nc: NC
+
+schematic:
+  symbol: IC
+  left: TTL, CTRL
+  right: CAN
+  top: VCC, VIO
+  bottom: GND
+
+housing@SO8: &SO8
+  pattern: SOP
+  bodyWidth: 3.8-4.0 # E
+  bodyLength: 4.8-5.0 # D
+  height: 1.75 # A
+  leadWidth: 0.36-0.49 # bp
+  leadLength: 0.4-1.0 # Lp
+  leadSpan: 5.8-6.2 # HE
+  pitch: 1.27 # e
+  leadCount: 8
+
+housing@T: *SO8
+
+housing@T/E: *SO8
+
+housing@T/3: *SO8
+
+housing@ZP:
+  pattern: QFN
+  bodyWidth: 5.90-6.10 # D
+  bodyLength: 4.90-5.10 # E
+  height: 0.70-0.80 # A
+  leadWidth: 0.35-0.48 # b
+  leadLength: 0.55-0.65 # L
+  pitch: 1.27 # e
+  leadCount: 8
+  tabWidth: 3.35-3.45 # D2
+  tabLength: 4.25-4.35 # E2
+  tabPosition: 0.0, 0.0
diff --git a/inductor/l4540.yaml b/inductor/l4540.yaml
new file mode 100644
index 0000000..369ad18
--- /dev/null
+++ b/inductor/l4540.yaml
@@ -0,0 +1,19 @@
+name: L4540
+description: power inductor, SMD, 4.5x4.0mm
+keywords: inductor
+
+schematic:
+  symbol: inductor
+
+housing:
+  pattern: custom
+  bodyLength: 4.5
+  bodyWidth: 4.0
+  height: 3.2
+
+  rowCount: 2
+  columnCount: 1
+  pitch: 3.3
+  padWidth: 4.5
+  padHeight: 1.8
+  padSpace: 1.5
diff --git a/mcu/espressif_esp32-c3-wroom-02.yaml b/mcu/espressif_esp32-c3-wroom-02.yaml
new file mode 100644
index 0000000..5b81130
--- /dev/null
+++ b/mcu/espressif_esp32-c3-wroom-02.yaml
@@ -0,0 +1,110 @@
+name: ESP32-C3-WROOM-02
+variations: 02, 02U
+description: Wi-Fi/Bluetooth System-on-Chip module
+keywords: IC, MCU, Micro-Controller, ESP32, ESP32-C3
+datasheet: https://www.espressif.com/sites/default/files/documentation/esp32-c3-wroom-02_datasheet_en.pdf
+
+pinout:
+  IO:
+    IO0-10: 18-15, 3-8, 10
+    IO18-19: 13-14
+  UART:
+    TXD: 12
+    RXD: 11
+  EN: 2
+  POWER:
+    3V3: 1
+  GND: 9, 19-27
+
+properties:
+  in: EN
+  bidir: IO, UART
+  power: POWER
+  ground: GND
+
+schematic:
+  symbol: IC
+  left: EN, UART
+  right: IO
+  top: POWER
+  bottom: GND
+
+housing:
+  pattern: custom
+  bodyWidth: 18.0
+  bodyLength: 20.0
+  height: 3.2
+  silkscreen: M -9.0,-4.0 9.0,-4.0 # 20.0/-2+6
+
+  # left
+  #numbers: 1-9
+  rowCount: 9
+  columnCount: 1
+  padWidth: 1.5
+  padHeight: 0.9
+  verticalPitch: 1.5
+  horizontalPitch: 0.0
+  columnDX: -8.75 # 17.5/2
+  rowDY: 3.1 # 20.0/-2+7.1+4*1.5
+
+  # right
+  #numbers1: 10-18
+  rowCount1: 9
+  columnCount1: 1
+  padWidth1: 1.5
+  padHeight1: 0.9
+  verticalPitch1: -1.5
+  horizontalPitch1: 0.0
+  columnDX1: 8.75 # 17.5/2
+  rowDY1: 3.1 # 20.0/-2+7.1+4*1.5
+
+  # center ground
+  #numbers2: 19-27
+  rowCount2: 3
+  columnCount2: 3
+  padWidth2: 0.7
+  padHeight2: 0.7
+  verticalPitch2: 1.1
+  horizontalPitch2: 1.1
+  rowDX2: 0.96 # 18.0/-2+9.96
+  columnDY2: 3.3 # 20.0/2-6.7
+
+housing@02U:
+  pattern: custom
+  bodyWidth: 18.0
+  bodyLength: 14.3
+  height: 3.2
+  suffix: U
+
+  # left
+  #numbers: 1-9
+  rowCount: 9
+  columnCount: 1
+  padWidth: 1.5
+  padHeight: 0.9
+  verticalPitch: 1.5
+  horizontalPitch: 0.0
+  columnDX: -8.75 # 17.5/2
+  rowDY: 0.25 # 14.3/-2+1.4+4*1.5
+
+  # right
+  #numbers1: 10-18
+  rowCount1: 9
+  columnCount1: 1
+  padWidth1: 1.5
+  padHeight1: 0.9
+  verticalPitch1: -1.5
+  horizontalPitch1: 0.0
+  columnDX1: 8.75 # 17.5/2
+  rowDY1: 0.25 # 14.3/-2+1.4+4*1.5
+
+  # center ground
+  #numbers2: 19-27
+  rowCount2: 3
+  columnCount2: 3
+  padWidth2: 0.7
+  padHeight2: 0.7
+  verticalPitch2: 1.1
+  horizontalPitch2: 1.1
+  rowDX2: 0.96 # 18.0/-2+9.96
+  columnDY2: 0.45 # 14.3/2-6.7
diff --git a/mcu/espressif_esp32-c3-wroom.yaml b/mcu/espressif_esp32-c3-wroom.yaml
new file mode 100644
index 0000000..b38be34
--- /dev/null
+++ b/mcu/espressif_esp32-c3-wroom.yaml
@@ -0,0 +1,70 @@
+name: ESP32-C3-WROOM-02
+variations: U
+description: Wi-Fi System-on-Chip module
+keywords: IC, MCU, Micro-Controller, ESP32, ESP32-C3
+datasheet: https://www.espressif.com/sites/default/files/documentation/esp32-c3-wroom-02_datasheet_en.pdf
+
+pinout:
+  IO: 18-15, 3-8,10
+    IO0-9: 18-15,3-8,10
+    IO18-19: 13-14
+  UART:
+    TXD: 12
+    RXD: 11
+  EN: 2
+  POWER:
+    3V3: 1
+  GND: 1, 19-27
+
+properties:
+  in: EN
+  bidir: IO, UART
+  power: POWER
+  ground: GND
+
+schematic:
+  symbol: IC
+  left: EN, UART
+  right: IO
+  top: POWER
+  bottom: GND
+
+housing:
+  pattern: custom
+  bodyWidth: 18.0
+  bodyLength: 20.0
+  height: 3.2
+  silkscreen: M -9.0,-4.0 9.0,-4.0 # 20.0/-2+6
+
+  # left
+  #numbers: 1-9
+  rowCount: 9
+  columnCount: 1
+  padWidth: 1.5
+  padHeight: 0.9
+  verticalPitch: 1.5
+  horizontalPitch: 0.0
+  columnDX: -8.75 # 17.5/2
+  rowDY: 3.1 # 20.0/-2+7.1+4*1.5
+
+  # right
+  # numbers1: 10-18
+  rowCount1: 9
+  columnCount1: 1
+  padWidth1: 1.5
+  padHeight1: 0.9
+  verticalPitch1: -1.5
+  horizontalPitch1: 0.0
+  columnDX1: 8.75 # 17.5/2
+  rowDY1: 3.1 # 20.0/-2+7.1+4*1.5
+
+  # center ground
+  #numbers2: 19-27
+  rowCount2: 3
+  columnCount2: 3
+  padWidth2: 0.7
+  padHeight2: 0.7
+  verticalPitch2: 1.1
+  horizontalPitch2: 1.1
+  rowDX1: 0.96 # 18.0/-2+9.96
+  columnDY2: 3.3 # 20.0/2-6.7
diff --git a/transistor/optocoupler_pc817.yaml b/transistor/optocoupler_pc817.yaml
new file mode 100644
index 0000000..f533bd9
--- /dev/null
+++ b/transistor/optocoupler_pc817.yaml
@@ -0,0 +1,38 @@
+name: PC817
+variations: DIP, SMD
+description: optocoupler, photocoupler
+
+pinout:
+  Anode: 1
+  Cathode: 2
+  Emitter: 3
+  Collector: 4
+
+schematic:
+  symbol: IC
+  options: optocoupler
+  left: Anode, Cathode
+  right: Collector, Emitter
+
+housing@DIP:
+  pattern: DIP
+  leadCount: 4
+  pitch: 2.54
+  bodyWidth: 6.5
+  bodyLength: 4.58
+  height: 4.0
+  leadWidth: 0.5
+  leadLength: 2.7
+  leadHeight: 0.26
+  leadSpan: 7.62
+
+housing@SMD:
+  pattern: SOP
+  height: 3.5
+  leadCount: 4
+  pitch: 2.54
+  bodyWidth: 6.5
+  bodyLength: 4.58
+  leadLength: 1.0
+  leadWidth: 1.2
+  leadSpan: 10.0
diff --git a/vreg/buck_tx4137.yaml b/vreg/buck_tx4137.yaml
new file mode 100644
index 0000000..a58f039
--- /dev/null
+++ b/vreg/buck_tx4137.yaml
@@ -0,0 +1,36 @@
+name: TX4137
+description: step-down buck converter
+datasheet: 
+distributors: LCSC C691124
+
+pinout:
+  NC: 1
+  GND: 2
+  FB: 3
+  EN: 4
+  IN: 5
+  SW: 6
+
+properties:
+  power: IN
+  out: SW
+  ground: GND
+  in: EN, FB
+  nc: NC
+
+schematic:
+  symbol: IC
+  left: IN, EN
+  right: SW, FB
+  bottom: GND
+
+housing:
+  pattern: SOT23
+  bodyWidth: 1.6-1.7 # B
+  bodyLength: 2.82-3.02 # A
+  leadSpan: 2.65-2.95 # B1
+  leadWidth: 0.3-0.5 # A2
+  leadLength: 0.3-0.6 # D
+  height: 0.7-0.8 # C
+  pitch: 0.95 # A1
+  leadCount: 6