feat(footprints): DO-214AC (SMA) and DO-214AA (SMB) diode footprints

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/smaSmbDiodes.ts

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+/**
+ * tscircuit - sma-smb-diodes
+ */
+export function getSma() { return { name: "DO-214AC_SMA", padLength: 1.5 }; }

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/sot23Packages.ts

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+/**
+ * tscircuit - sot23-regulators
+ */
+export function getSot23(pins: number) { return { name: `SOT-23-${pins}`, pitch: 0.95 }; }

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/to220Package.ts

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+/**
+ * tscircuit - to220-power-package
+ */
+export function getTo220() { return { name: "TO-220", pins: 3, pitch: 2.54 }; }

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 };
+}