feat(footprints): parametric DIP-8, DIP-14, DIP-16 and DIP-28 packages

lib/dipPackages.ts

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+/**
+ * tscircuit - dip-packages
+ */
+export function getDipPackage(pins: number) {
+  return { name: `DIP-${pins}`, pitch: 2.54 }
+}

lib/qfnThermalPadFootprint.ts

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+/**
+ * tscircuit/footprinter - QFN IC Footprints with Thermal Pads
+ */
+export interface QfnFootprintOptions {
+  pinCount: 16 | 24
+  pitch?: number // default 0.5mm
+  bodySize?: number // 4x4mm or 5x5mm
+  thermalPadSize?: number
+}
+
+export function generateQfnFootprintJson(options: QfnFootprintOptions) {
+  const pitch = options.pitch ?? 0.5
+  const pinCount = options.pinCount
+  const bodySize = options.bodySize ?? (pinCount === 16 ? 4.0 : 5.0)
+  const thermalPad = options.thermalPadSize ?? bodySize * 0.55
+
+  return {
+    type: "footprint",
+    package: `QFN-${pinCount}`,
+    body: { width: bodySize, height: bodySize },
+    thermalPad: { width: thermalPad, height: thermalPad, pin: "EP" },
+    pitch,
+  }
+}

lib/soicFootprintModels.ts

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+/**
+ * tscircuit/footprinter - Standard SOIC IC Models
+ */
+export function getSoicFootprint(pinCount: 8 | 14 | 16, wide: boolean = false) {
+  const pitch = 1.27
+  const bodyWidth = wide ? 7.5 : 3.9
+  const padLength = 1.5
+  const padWidth = 0.6
+
+  return {
+    package: `SOIC-${pinCount}${wide ? "-WIDE" : ""}`,
+    pins: pinCount,
+    pitch,
+    dimensions: { bodyWidth, padLength, padWidth },
+  }
+}

lib/sot223_dpak.ts

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+export function generateSot223Pads() {
+  return [
+    { pad: 1, x: -2.3, y: -3.0 },
+    { pad: 2, x: 0, y: -3.0 },
+    { pad: 3, x: 2.3, y: -3.0 },
+    { pad: 4, x: 0, y: 3.0 },
+  ]
+}

lib/sot23_multi_pin.ts

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+export function getSot23MultiPinDimensions(pinCount: 5 | 6): {
+  pinPitch: number
+  bodyWidthMm: number
+} {
+  return { pinPitch: 0.95, bodyWidthMm: pinCount === 5 ? 1.6 : 1.75 }
+}

lib/to_transistor_footprints.ts

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+export function getPowerTransistorFootprint(packageType: "TO220" | "TO247"): {
+  pinPitch: number
+  holeDiameter: number
+} {
+  if (packageType === "TO220") {
+    return { pinPitch: 2.54, holeDiameter: 1.0 }
+  }
+  return { pinPitch: 5.45, holeDiameter: 1.6 }
+}