diff --git a/vreg/dcdc_bxxxxs.yaml b/vreg/dcdc_bxxxxs.yaml
new file mode 100644
index 0000000..eb327f4
--- /dev/null
+++ b/vreg/dcdc_bxxxxs.yaml
@@ -0,0 +1,32 @@
+name: BxxxxS
+description: DC/DC converter, isolated
+datasheet: https://www.mornsun-power.com/public/uploads/pdf/B05_S-1WR3.pdf
+
+pinout:
+  GND: 1
+  VIN: 2
+  0V: 3
+  VO: 4
+
+properties:
+  power: VIN, VO
+  ground: GND, 0V
+
+schematic:
+  symbol: IC
+  left: VIN, GND
+  right: VO, 0V
+
+housing:
+  pattern: custom
+  bodyWidth: 11.6
+  bodyLength: 6.0
+  height: 10.16
+  leadWidth: 0.5
+  leadHeight: 0.3
+  holeDiameter: 1.0 # (recommended, not lead diameter + 0.2)
+  padDiameter: 1.4 # hole diameter + 0.2 * 2
+  rowCount: 1
+  columnCount: 4
+  pitch: 2.54
+  rowDY: 2.1 # 6.0/2-0.9