Skip to content

Add UTDFN-4-EP footprint and tests #437

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Draft
Devesh36 wants to merge 2 commits into
base: main
Choose a base branch
from
Draft

Add UTDFN-4-EP footprint and tests #437

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
f51d4d8
Add UTDFN-4-EP footprint and tests
Devesh36 Dec 6, 2025
9383134
Refactor utdfn4ep footprint definition and tests for improved readabi…
Devesh36 Dec 6, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
1 change: 1 addition & 0 deletions src/fn/index.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@ export { sot886 } from "./sot886"
export { sot23 } from "./sot23"
export { sot25 } from "./sot25"
export { dfn } from "./dfn"
export { utdfn4ep } from "./utdfn4ep"
export { pinrow } from "./pinrow"
export { sot563 } from "./sot563"
export { ms012 } from "./ms012"
Expand Down
76 changes: 76 additions & 0 deletions src/fn/utdfn4ep.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,76 @@
import type { AnyCircuitElement } from "circuit-json"
import { rectpad } from "src/helpers/rectpad"
import { z } from "zod"

/**
* UTDFN-4-EP (1x1) footprint
*
* References (JLCPCB part pages):
* - Microchip MIC5366-1.8YMT-TZ (UTDFN-4-EP 1x1): https://jlcpcb.com/partdetail/MIC5366-1.8YMT-TZ/C621364
* - Fitipower FP6182-28X7 (UTDFN-4-EP 1x1): https://jlcpcb.com/partdetail/FP6182-28X7/C498349
* Recommended land pattern per Microchip datasheet:
* - https://ww1.microchip.com/downloads/en/DeviceDoc/MIC5366-1.8YMT-TZ-DS20005619G.pdf (page 11)
*/
export const utdfn4ep_def = z.object({
origin: z.string().optional(),

norefdes: z.boolean().optional(),

faceup: z.boolean().optional(),

pad_w: z.number().optional(),
pad_h: z.number().optional(),
ep_w: z.number().optional(),
ep_h: z.number().optional(),
inset: z.number().optional(),
})

export const utdfn4ep = (
raw_params: z.input<typeof utdfn4ep_def> | undefined,
): { circuitJson: AnyCircuitElement[]; parameters: any } => {
const parameters = utdfn4ep_def.parse(raw_params ?? {})

const body_w = 1.0
const body_h = 1.0

const pad_w = parameters.pad_w ?? 0.4
const pad_h = parameters.pad_h ?? 0.48
const ep_w = parameters.ep_w ?? 0.47
const ep_h = parameters.ep_h ?? 0.22
const inset = parameters.inset ?? 0.05

const half_body_w = body_w / 2
const half_body_h = body_h / 2

const pads: AnyCircuitElement[] = []

// Bottom-left (pin 1)
const bl_x = -(half_body_w - pad_w / 2 - inset)
const bl_y = -(half_body_h - pad_h / 2 - inset)
pads.push(rectpad(1, bl_x, bl_y, pad_w, pad_h))

// Bottom-right (pin 2)
const br_x = +(half_body_w - pad_w / 2 - inset)
const br_y = -(half_body_h - pad_h / 2 - inset)
pads.push(rectpad(2, br_x, br_y, pad_w, pad_h))

// Top-right (pin 3)
const tr_x = +(half_body_w - pad_w / 2 - inset)
const tr_y = +(half_body_h - pad_h / 2 - inset)
pads.push(rectpad(3, tr_x, tr_y, pad_w, pad_h))

// Top-left (pin 4)
const tl_x = -(half_body_w - pad_w / 2 - inset)
const tl_y = +(half_body_h - pad_h / 2 - inset)
pads.push(rectpad(4, tl_x, tl_y, pad_w, pad_h))

// Central exposed pad (EP) - use pad id '5' to denote EP
pads.push(rectpad(5, 0, 0, ep_w, ep_h))

return {
circuitJson: pads as AnyCircuitElement[],
parameters,
}
}

export type Utdfn4epParams = z.input<typeof utdfn4ep_def>
1 change: 1 addition & 0 deletions tests/__snapshots__/utdfn4ep_default.snap.svg
View file
Open in desktop
Loading
Sorry, something went wrong. Reload?
Sorry, we cannot display this file.
Sorry, this file is invalid so it cannot be displayed.
1 change: 1 addition & 0 deletions tests/__snapshots__/utdfn4ep_overrides.snap.svg
View file
Open in desktop
Loading
Sorry, something went wrong. Reload?
Sorry, we cannot display this file.
Sorry, this file is invalid so it cannot be displayed.
20 changes: 20 additions & 0 deletions tests/utdfn4ep.test.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,20 @@
import { test, expect } from "bun:test"
import { convertCircuitJsonToPcbSvg } from "circuit-to-svg"
import { utdfn4ep } from "../src/fn/utdfn4ep"

test("utdfn4ep_default", () => {
const { circuitJson } = utdfn4ep(undefined)
const svgContent = convertCircuitJsonToPcbSvg(circuitJson)
expect(svgContent).toMatchSvgSnapshot(import.meta.path, "utdfn4ep_default")
})

test("utdfn4ep_overrides", () => {
const { circuitJson } = utdfn4ep({
pad_w: 0.4,
pad_h: 0.5,
ep_w: 0.7,
ep_h: 0.7,
})
const svgContent = convertCircuitJsonToPcbSvg(circuitJson)
expect(svgContent).toMatchSvgSnapshot(import.meta.path, "utdfn4ep_overrides")
})