feat: implement WSON footprint

src/fn/index.ts

@@ -80,3 +80,4 @@ export { sot343 } from "./sot343"
 export { m2host } from "./m2host"
 export { mountedpcbmodule } from "./mountedpcbmodule"
 export { to92l } from "./to92l"
+export { wson } from "./wson"

src/fn/wson.ts

@@ -0,0 +1,28 @@
+import type { AnySoupElement } from "circuit-json"
+import { base_quad_def, quad, quadTransform } from "./quad"
+import type { z } from "zod"
+
+/**
+ * WSON (Very Very Thin Small Outline No-lead) footprint
+ * Similar to SON/DFN but typically with exposed thermal pad
+ * Common for TI power management ICs
+ */
+export const wson_def = base_quad_def.extend({}).transform(quadTransform)
+
+export const wson = (
+  parameters: z.input<typeof wson_def>,
+): { circuitJson: AnySoupElement[]; parameters: any } => {
+  parameters.legsoutside = false
+  // WSON typically has thermal pad
+  if (parameters.thermalpad === undefined) {
+    parameters.thermalpad = true
+  }
+  // Default pad dimensions for WSON if not specified
+  if (!parameters.pl) {
+    parameters.pl = 0.5
+  }
+  if (!parameters.pw) {
+    parameters.pw = 0.25
+  }
+  return quad(parameters)
+}