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Implement 4x0612 resistor array variant #472

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5ac037c
Implement 4x0612 resistor array variant
techmannih Jan 10, 2026
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techmannih Jan 10, 2026
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8 changes: 8 additions & 0 deletions src/fn/res.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ import { res0402Array4 } from "../helpers/res0402-array4"
import { res0603Array2 } from "../helpers/res0603-array2"
import { res0603Array4 } from "../helpers/res0603-array4"
import { res0606Array2 } from "../helpers/res0606-array2"
import { res0612Array4 } from "../helpers/res0612-array4"
import { res1206Array4 } from "../helpers/res1206-array4"

type ResArrayParams = PassiveDef & {
Expand Down Expand Up @@ -80,6 +81,13 @@ export const res = (
}
}

if (arrayCount === 4 && imperialBase === "0612") {
return {
circuitJson: res0612Array4(rawParameters),
parameters: rawParameters,
}
}

if (arrayCount === 4 && imperialBase === "1206") {
return {
circuitJson: res1206Array4(rawParameters),
Expand Down
45 changes: 33 additions & 12 deletions src/helpers/chipArray.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,8 @@ export interface ChipArrayParams {
textbottom?: boolean
convex?: boolean
concave?: boolean
padHeights?: number[] // Optional: variable pad heights per position (overrides padHeight)
yPositions?: number[] // Optional: custom Y positions (overrides padPitch calculation)
}

/**
Expand All @@ -22,36 +24,54 @@ export interface ChipArrayParams {
* @returns Array of circuit elements (pads, silkscreen, pin1 marker, ref text)
*/
export const chipArray = (params: ChipArrayParams): AnyCircuitElement[] => {
const { padSpacing, padWidth, padHeight, padPitch, numRows, textbottom } =
params
const {
padSpacing,
padWidth,
padHeight,
padPitch,
numRows,
textbottom,
padHeights,
yPositions: customYPositions,
} = params

// Calculate Y positions for pads (centered around origin)
const yPositions: number[] = []
const halfRange = (numRows - 1) * (padPitch / 2)
for (let i = 0; i < numRows; i++) {
yPositions.push(halfRange - i * padPitch)
}
const yPositions: number[] =
customYPositions ??
(() => {
const positions: number[] = []
const halfRange = (numRows - 1) * (padPitch / 2)
for (let i = 0; i < numRows; i++) {
positions.push(halfRange - i * padPitch)
}
return positions
})()

const pads: AnyCircuitElement[] = []

// Left column: pins 1 to numRows
yPositions.forEach((y, index) => {
pads.push(rectpad(index + 1, -padSpacing / 2, y, padWidth, padHeight))
const height = padHeights?.[index] ?? padHeight
pads.push(rectpad(index + 1, -padSpacing / 2, y, padWidth, height))
})

// Right column: pins numRows+1 to 2*numRows (reverse order)
yPositions
.slice()
.reverse()
.forEach((y, index) => {
// For right column, reverse the padHeights array as well
const height = padHeights?.[yPositions.length - 1 - index] ?? padHeight
pads.push(
rectpad(index + numRows + 1, padSpacing / 2, y, padWidth, padHeight),
rectpad(index + numRows + 1, padSpacing / 2, y, padWidth, height),
)
})

// Calculate silkscreen boundaries - match KiCad style (two horizontal lines)
const top = Math.max(...yPositions) + padHeight / 2 + 0.4
const bottom = Math.min(...yPositions) - padHeight / 2 - 0.4
// Use max pad height for silkscreen calculations
const maxPadHeight = padHeights ? Math.max(...padHeights) : padHeight
const top = Math.max(...yPositions) + maxPadHeight / 2 + 0.4
const bottom = Math.min(...yPositions) - maxPadHeight / 2 - 0.4
const left = -padSpacing / 2 - padWidth / 2 - 0.4
const right = padSpacing / 2 + padWidth / 2 + 0.4

Expand Down Expand Up @@ -85,8 +105,9 @@ export const chipArray = (params: ChipArrayParams): AnyCircuitElement[] => {
const pin1X = -padSpacing / 2
const pin1Y = Math.max(...yPositions)
const pin1MarkerSize = 0.2
const pin1Height = padHeights?.[0] ?? padHeight
const pin1Left = pin1X - padWidth / 2 - 0.1
const pin1Top = pin1Y + padHeight / 2 + 0.1
const pin1Top = pin1Y + pin1Height / 2 + 0.1
const pin1Marker: PcbSilkscreenPath = {
type: "pcb_silkscreen_path",
layer: "top",
Expand Down
53 changes: 53 additions & 0 deletions src/helpers/res0612-array4.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,53 @@
import type { AnyCircuitElement } from "circuit-json"
import { chipArray } from "./chipArray"
import { z } from "zod"
import { base_def } from "./zod/base_def"
import mm from "@tscircuit/mm"

export const res0612Array4_def = base_def.extend({
pw: z.string().default("0.7mm"),
ph: z.string().default("0.64mm"),
p: z.string().default("0.847mm"),
textbottom: z.boolean().optional(),
convex: z.boolean().optional(),
concave: z.boolean().optional(),
})

export type Res0612Array4Params = z.input<typeof res0612Array4_def>

const padSpacing = 1.4 // Horizontal spacing between columns (KiCad: 1.4mm)

export const res0612Array4 = (
rawParams: Res0612Array4Params,
): AnyCircuitElement[] => {
const params = res0612Array4_def.parse(rawParams)

// Convert string values to numbers
const padWidth = mm(params.pw)
const padHeight = mm(params.ph)
const padPitch = mm(params.p)

// Check if using default parameters to match KiCad exactly
const isDefaultParams =
params.pw === "0.7mm" && params.ph === "0.64mm" && params.p === "0.847mm"

// KiCad exact values for R_Array_Convex_4x0612
// Y positions: [1.270, 0.400, -0.400, -1.270]
// Pad heights: [0.640, 0.500, 0.500, 0.640] for top to bottom
const kicadYPositions = [1.27, 0.4, -0.4, -1.27]
const kicadPadHeights = [0.64, 0.5, 0.5, 0.64]

return chipArray({
padSpacing,
padWidth,
padHeight,
padPitch,
numRows: 4,
textbottom: params.textbottom,
convex: params.convex,
concave: params.concave,
// Use KiCad exact values when default params, otherwise use calculated positions
yPositions: isDefaultParams ? kicadYPositions : undefined,
padHeights: isDefaultParams ? kicadPadHeights : undefined,
})
}
1 change: 1 addition & 0 deletions tests/__snapshots__/0612_x4_default.snap.svg
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1 change: 1 addition & 0 deletions tests/__snapshots__/0612_x4_p2.0.snap.svg
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1 change: 1 addition & 0 deletions tests/__snapshots__/0612_x4_ph1.4.snap.svg
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1 change: 1 addition & 0 deletions tests/__snapshots__/0612_x4_pw1.2.snap.svg
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