Implement SPDIP footprint with spdip28 support

src/fn/index.ts

@@ -81,3 +81,4 @@ export { sot343 } from "./sot343"
 export { m2host } from "./m2host"
 export { mountedpcbmodule } from "./mountedpcbmodule"
 export { to92l } from "./to92l"
+export { spdip } from "./spdip"

src/fn/spdip.ts

@@ -0,0 +1,16 @@
+import type { AnyCircuitElement } from "circuit-json"
+import { dip, extendDipDef } from "./dip"
+
+export const spdip_def = extendDipDef({ w: "300mil", p: "1.778mm" })
+
+export const spdip = (
+  raw_params: any,
+): { circuitJson: AnyCircuitElement[]; parameters: any } => {
+  const parameters = spdip_def.parse(raw_params)
+  // Standard SDIP/SPDIP packages have smaller pad sizes to prevent overlap.
+  if (raw_params.id === undefined && raw_params.od === undefined) {
+    parameters.id = 0.7
+    parameters.od = 1.3
+  }
+  return dip({ ...parameters, dip: true } as any)
+}

src/footprinter.ts

@@ -40,6 +40,12 @@ export type Footprinter = {
   dip: (
     num_pins?: number,
   ) => FootprinterParamsBuilder<"w" | "p" | "id" | "od" | "wide" | "narrow">
+  pdip: (
+    num_pins?: number,
+  ) => FootprinterParamsBuilder<"w" | "p" | "id" | "od" | "wide" | "narrow">
+  spdip: (
+    num_pins?: number,
+  ) => FootprinterParamsBuilder<"w" | "p" | "id" | "od" | "wide" | "narrow">
   cap: () => FootprinterParamsBuilder<CommonPassiveOptionKey>
   res: () => FootprinterParamsBuilder<CommonPassiveOptionKey>
   diode: () => FootprinterParamsBuilder<CommonPassiveOptionKey>

tests/spdip.test.ts

@@ -0,0 +1,34 @@
+import { expect, test } from "bun:test"
+import { convertCircuitJsonToPcbSvg } from "circuit-to-svg"
+import { fp } from "../src/footprinter"
+
+test("spdip28", () => {
+  const circuitJson = fp.string("spdip28").circuitJson()
+
+  // Exclude silkscreen path and courtyard to find only plated holes
+  const holes = circuitJson.filter((e: any) => e.type === "pcb_plated_hole")
+  expect(holes.length).toBe(28)
+
+  // Verify that row spacing is 300mil (7.62mm)
+  // Pin 1 (left row) and Pin 28 (right row) should have x-distance of 7.62mm
+  const pin1 = holes.find((h: any) => h.port_hints?.includes("1"))
+  const pin28 = holes.find((h: any) => h.port_hints?.includes("28"))
+  expect(pin1).toBeDefined()
+  expect(pin28).toBeDefined()
+  expect(Math.abs(pin28.x - pin1.x)).toBeCloseTo(7.62, 3)
+
+  // Verify that pin pitch is 1.778mm
+  // Pin 1 and Pin 2 (adjacent pins on same side) should have y-distance of 1.778mm
+  const pin2 = holes.find((h: any) => h.port_hints?.includes("2"))
+  expect(pin2).toBeDefined()
+  expect(Math.abs(pin2.y - pin1.y)).toBeCloseTo(1.778, 3)
+
+  const svgContent = convertCircuitJsonToPcbSvg(circuitJson)
+  expect(svgContent).toMatchSvgSnapshot(import.meta.path, "spdip28")
+})
+
+test("spdip (default 6 pins)", () => {
+  const circuitJson = fp.string("spdip").circuitJson()
+  const holes = circuitJson.filter((e: any) => e.type === "pcb_plated_hole")
+  expect(holes.length).toBe(6)
+})