3 files changed, +52 −11

part.py +28 −2

Copy diff

		@@ -5,7 +5,7 @@
5	5	from steve import Model
6	6	import math
7	7
8		-package = "TO-220AB" # TO-220AB, TO-220AC, TO-220F, TO-220F-2, TO-247AC, TO-126, TO-92, TO-18, TO-18-2, TO-39 or TO-46
	8	+package = "TO-220AB" # TO-220AB, TO-220AC, TO-220F, TO-220F-2, TO-262, TO-247AC, TO-126, TO-92, TO-18, TO-18-2, TO-39 or TO-46
9	9	detail = "full" # full: body, tab and leads; simple: the body and tab only
10	10
11	11	# Vishay Siliconix, "TO-220AB (High Voltage)", Package Information, document 92506, revision 30-Sep-2024 (DWG 6031), page 2 table; and
		@@ -68,8 +68,16 @@
68	68	# ending 0.1 x the height above the bottom (drawn dashed in the front view, not dimensioned); the TO-220FP-2's cut-off middle lead stub
69	69	# (O, P, Q on its sheet) isn't modelled.
70	70	PLATE_T = 0.3
	71	+# Vishay Siliconix, "I2PAK (TO-262) (High Voltage)", Package Information, document 91367, revision 27-Oct-08 (DWG 5977), table (min, max)
	72	+# in mm, the middle (a single value where the table gives only a min or a max: D1, E1 min; L1 max). A body thickness, A1 the leads' back face
	73	+# to the back, b lead width, b2 shoulder width, c lead thickness, c2 tab thickness, D body height, D1 x E1 the thermal pad on the back,
	74	+# E width, e pitch, L lead length below the body, L1 the tab above the body, L2 shoulder length.
	75	+TO262 = dict(A=(4.06, 4.83), A1=(2.03, 3.02), b=(0.51, 0.99), b2=(1.14, 1.78), c=(0.38, 0.74), c2=(1.14, 1.65), D=(8.38, 9.65), D1=(6.86, 6.86),
	76	+ E=(9.65, 10.67), E1=(6.22, 6.22), e=(2.54, 2.54), L=(13.46, 14.10), L1=(1.65, 1.65), L2=(3.56, 3.71))
	77	+# Proportions, for looks: the TO-262 tab above the body is the body's width with its top corners chamfered 0.04 x the width (drawn, not
	78	+# dimensioned), and the thermal pad on the back is flush, from the body's top down.
71	79
72		-PACKAGES = ("TO-220AB", "TO-220AC", "TO-220F", "TO-220F-2", "TO-247AC", "TO-126", "TO-92", "TO-18", "TO-18-2", "TO-39", "TO-46")
	80	+PACKAGES = ("TO-220AB", "TO-220AC", "TO-220F", "TO-220F-2", "TO-262", "TO-247AC", "TO-126", "TO-92", "TO-18", "TO-18-2", "TO-39", "TO-46")
73	81	if package not in PACKAGES:
74	82	raise ValueError("package: " + ", ".join(PACKAGES))
75	83
		@@ -136,6 +144,24 @@
136	144	bodies = {"body_body": ("pa6", "#1c1c1e"), "tab_body": ("copper", "#c8ccd0")}
137	145	if detail == "full":
138	146	leads(xs, t["b"], t["c"], t["L"], t["L1"], [t["b2"]] * len(xs), z0)
	147	+elif package == "TO-262":
	148	+ # Moulded body with the metal tab: c2 thick, flush with the back, showing as the pad D1 x E1 from the body's top down and rising L1 above it.
	149	+ t = mid(TO262)
	150	+ xs = [0.0, t["e"], 2 * t["e"]]
	151	+ cx = t["e"]
	152	+ back = t["c"] / 2 + t["A1"]
	153	+ front = back - t["A"]
	154	+ z0 = t["L2"] # the shoulders rest on the board
	155	+ top = z0 + t["D"]
	156	+ E, k = t["E"], 0.04 * t["E"]
	157	+ box("body", cx - E / 2, cx + E / 2, front, back, z0, top, "body_body", "new", "Body")
	158	+ box("pad_recess", cx - t["E1"] / 2, cx + t["E1"] / 2, back - t["c2"], back, top - t["D1"], top, "body_body", "cut", "Thermal pad recess")
	159	+ box("pad", cx - t["E1"] / 2, cx + t["E1"] / 2, back - t["c2"], back, top - t["D1"], top, "tab_body", "new", "Thermal pad")
	160	+ through_y("tab_top", [(cx - E / 2, top), (cx + E / 2, top), (cx + E / 2, top + t["L1"] - k), (cx + E / 2 - k, top + t["L1"]),
	161	+ (cx - E / 2 + k, top + t["L1"]), (cx - E / 2, top + t["L1"] - k)], back, back - t["c2"], "tab_body", "join", "Tab")
	162	+ bodies = {"body_body": ("pa6", "#1c1c1e"), "tab_body": ("copper", "#c8ccd0")}
	163	+ if detail == "full":
	164	+ leads(xs, t["b"], t["c"], t["L"], t["L2"], [t["b2"]] * 3, z0)
139	165	elif package in ("TO-220F", "TO-220F-2"):
140	166	# Fully moulded (no exposed metal): the full thickness A up to F below the top, then the thinner top part B thick, its back face flush.
141	167	t = mid(TO220F if package == "TO-220F" else TO220F2)

pypart.toml +12 −5

Copy diff

		@@ -1,17 +1,17 @@
1	1	name = "steve/to-package"
2		-version = "1.1.0"
	2	+version = "1.2.0"
3	3	runtime = "steve"
4	4	license = "MIT"
5		-summary = "Through-hole TO packages standing on the board: TO-220AB, TO-220AC, TO-220F, TO-247AC, TO-126, TO-92 and the TO-18, TO-39 and TO-46 metal cans, from the makers' drawings."
6		-description = """A through-hole transistor, regulator or diode package standing on the board, from the maker's package drawing: TO-220AB (3 leads) and TO-220AC (2 leads) with the metal tab and its hole, TO-247AC with its exposed copper and side slots, TO-92 with straight leads, TO-126 with its mounting plate, the fully moulded TO-220F with 3 or 2 leads, and the TO-18 (2 or 3 leads), TO-39 and TO-46 metal cans. Lead 1 at the origin, the leads along +X, the moulded front toward -Y. See the README."""
	5	+summary = "Through-hole TO packages standing on the board: TO-220AB, TO-220AC, TO-220F, TO-262, TO-247AC, TO-126, TO-92 and the TO-18, TO-39 and TO-46 metal cans, from the makers' drawings."
	6	+description = """A through-hole transistor, regulator or diode package standing on the board, from the maker's package drawing: TO-220AB (3 leads) and TO-220AC (2 leads) with the metal tab and its hole, TO-247AC with its exposed copper and side slots, TO-92 with straight leads, TO-126 with its mounting plate, the fully moulded TO-220F with 3 or 2 leads, TO-262 (I2PAK) with its tab, and the TO-18 (2 or 3 leads), TO-39 and TO-46 metal cans. Lead 1 at the origin, the leads along +X, the moulded front toward -Y. See the README."""
7	7	tags = ["to-220", "to-247", "to-92", "to-18", "to-39", "to-126", "transistor", "package", "through-hole", "electronics"]
8	8
9	9	[parameters.package]
10	10	type = "choice"
11	11	default = "TO-220AB"
12		-choices = ["TO-220AB", "TO-220AC", "TO-220F", "TO-220F-2", "TO-247AC", "TO-126", "TO-92", "TO-18", "TO-18-2", "TO-39", "TO-46"]
	12	+choices = ["TO-220AB", "TO-220AC", "TO-220F", "TO-220F-2", "TO-262", "TO-247AC", "TO-126", "TO-92", "TO-18", "TO-18-2", "TO-39", "TO-46"]
13	13	label = "Package"
14		-description = "TO-220AB: 3 leads at 2.54. TO-220AC: 2 leads 5.08 apart. TO-247AC: 3 leads at 5.46. TO-92: 3 straight leads at 1.27. TO-18: metal can, 3 leads on a 2.54 circle; TO-18-2: 2 leads 2.54 apart. TO-39: metal can, Ø 9, 3 leads on a 5.08 circle. TO-46: low metal can, 3 leads on a 2.54 circle. TO-126: 3 leads at 2.25, mounting plate on the back. TO-220F: fully moulded, 3 leads at 2.54; TO-220F-2: 2 leads 5.1 apart."
	14	+description = "TO-220AB: 3 leads at 2.54. TO-220AC: 2 leads 5.08 apart. TO-247AC: 3 leads at 5.46. TO-92: 3 straight leads at 1.27. TO-18: metal can, 3 leads on a 2.54 circle; TO-18-2: 2 leads 2.54 apart. TO-39: metal can, Ø 9, 3 leads on a 5.08 circle. TO-46: low metal can, 3 leads on a 2.54 circle. TO-126: 3 leads at 2.25, mounting plate on the back. TO-220F: fully moulded, 3 leads at 2.54; TO-220F-2: 2 leads 5.1 apart. TO-262 (I2PAK): 3 leads at 2.54, metal tab above the body and pad on the back."
15	15
16	16	[parameters.detail]
17	17	type = "choice"
		@@ -47,6 +47,13 @@
47	47	params = { package = "TO-220F-2" }
48	48	aliases = ["TO-220F-2", "TO-220FP-2", "TO-220 full pack 2 lead"]
49	49	standard = "Central TO-220FP-2"
	50	+
	51	+[[presets]]
	52	+id = "TO-262"
	53	+title = "TO-262 (I2PAK), 3 leads, 2.54 pitch, vertical (Vishay outline)"
	54	+params = { package = "TO-262" }
	55	+aliases = ["TO-262-3", "TO-262", "TO-262AA", "I2PAK", "I2-PAK"]
	56	+standard = "Vishay TO-262"
50	57
51	58	[[presets]]
52	59	id = "TO-247AC"

README.md +12 −4

Copy diff

		@@ -8,6 +8,7 @@
8	8	| `TO-220AC` | 2, 5.08 apart | 10.31 x 4.45 x 15.05 (tab included) | Vishay Semiconductors 95221 |
9	9	| `TO-220F` | 3, 2.54 pitch | 10.17 x 4.66 x 15.53, fully moulded | Central Semiconductor TO-220FP |
10	10	| `TO-220F-2` | 2, 5.10 apart | 10.31 x 4.80 x 15.10, fully moulded | Central Semiconductor TO-220FP-2 |
	11	+| `TO-262` | 3, 2.54 pitch | 10.16 x 4.45 x 10.67 (tab included) | Vishay Siliconix 91367 |
11	12	| `TO-247AC` | 3, 5.46 pitch | 15.70 x 5.02 x 20.55 | Vishay Siliconix 91360 |
12	13	| `TO-126` | 3, 2.25 pitch | 7.95 x 2.60 x 11.25 | Central Semiconductor TO-126 |
13	14	| `TO-92` | 3 straight, 1.27 pitch | 4.83 x 3.68 x 4.83 | TI LP0003A |
		@@ -18,7 +19,7 @@
18	19
19	20	Lead 1 is at the origin and the leads run along +X. The moulded front faces -Y (on the TO-92, the flat face), and the metal tab, exposed copper or mounting plate is at the back (+Y).
20	21
21		-- **TO-220, TO-220F, TO-247 and TO-126.** The leads' shoulders rest on the board (the XY plane), and the leads continue their full length down through it.
	22	+- **TO-220, TO-220F, TO-262, TO-247 and TO-126.** The leads' shoulders rest on the board (the XY plane), and the leads continue their full length down through it.
22	23	- **TO-92.** The body sits 1.5 above the board (TI's reference seating plane).
23	24	- **TO-18, TO-39 and TO-46.** The flange sits on the board. Leads 1 and 3 are G apart along +X (2.54, or 5.08 on the TO-39), and lead 2 is H off that line along -Y (1.27, or 2.54). The tab is at 45°, beside lead 1.
24	25
		@@ -32,6 +33,7 @@
32	33	- Page 1, drawing: front, side and back views and section F-F.
33	34	- Page 2, table (mm): A 4.25–4.65, A1 1.20–1.34, A2 2.563–2.92, b 0.71–0.91, b2 1.14–1.78, c 0.46–0.61, D 14.32–15.86, D1 8.39–8.79, D2 12.20–12.80, E 9.96–10.36, E1 8.14–8.74, E2 0.59–0.69, e 2.54, e1 5.08, H1 6.30–6.70, L 13.40–14.40, L1 3.65–4.05, ØP 3.60–3.80, Q 2.54–2.94.
34	35	- **Vishay Semiconductors, "TO-220AC"**, Outline Dimensions, document 95221, revision 16-Jan-2026, from vishay.com. The drawing and table use the same letters. Here e1 is 4.88–5.28, the spacing of the two leads, and E2 is 0.76 max. The outline conforms to JEDEC TO-220AC.
	36	+- **Vishay Siliconix, "I2PAK (TO-262) (High Voltage)"**, Package Information, document 91367, revision 27-Oct-08 (DWG 5977), from vishay.com. Table (mm): A 4.06–4.83, A1 2.03–3.02, b 0.51–0.99, b2 1.14–1.78, c 0.38–0.74, c2 1.14–1.65, D 8.38–9.65, D1 6.86 min, E 9.65–10.67, E1 6.22 min, e 2.54, L 13.46–14.10, L1 1.65 max, L2 3.56–3.71. Where the table gives only a minimum or a maximum, the part uses it.
35	37	- **Vishay Siliconix, "TO-247AC (High Voltage)"**, Package Information, document 91360, revision 07-Sep-2026, from vishay.com. The part uses version 1 (facility code 9) with its nominal values:
36	38	- A 5.02, A1 2.41, A2 1.27, b 1.20, b2 2.00, b4 3.00, c 0.50, D 20.55, D1 16.76, D2 0.66, E 15.70, E1 14.02, E2 4.91, e 5.46, L 15.15, L1 4.06, ØP 3.61, ØP1 7.19 (ref), Q 5.50.
37	39	- The package reference is JEDEC TO-247, variation AC.
		@@ -57,18 +59,20 @@
57	59	- **TO-220 and TO-247.** A2 (TO-247: A1) runs from the leads' back face to the back of the package. The leads' shoulders (b2, b4) are L1 long. On the TO-220, the metal tab is A1 thick: E wide above the moulding (H1 = D - D1), and E1 wide down the back to D2 below the top. On the TO-247, the exposed copper (D1 x E1, from D2 below the top) is taken as A2 thick, the dimension drawn at the back face. The TO-247's side slots are Ø E2, at Q below the top, the same height as the hole.
58	60	- **TO-92.** The body is a round of Ø W, cut flat at the depth T, with the leads K in front of the round back.
59	61	- **TO-18, TO-39 and TO-46.** The tab length J is read as reaching beyond the flange's edge.
	62	+- **TO-262.** A1 is read as on the TO-220: from the leads' back face to the back. The tab is c2 thick and flush with the back. It shows on the back as the thermal pad D1 x E1, from the body's top down (Section A-A), and rises L1 above the body. The shoulders (b2) are L2 long, and L is the lead's length from the body.
60	63	- **TO-220F.** The side view draws the body A thick up to F below the top, and above that B thick with the back face flush, so the hole is in the thinner part. H is the shoulder's length below the body, J the lead's from the body.
61	64	- **TO-126.** H is the lead's length from the body, shoulder included, and B runs from the back (the side the sheet marks "BACKSIDE") to the leads' centre plane.
62	65
63	66	**Proportions, for looks only.** The drawings show these but don't dimension them:
64	67
65	68	- The TO-220 tab's side notches, E2 deep, are 1.4 high, from 1.4 to 2.8 below the top, as drawn.
	69	+- The TO-262 tab above the body is the body's full width, with its top corners chamfered 0.04 x the width.
66	70	- The TO-126's mounting plate on the back, drawn dashed in the front view, is 0.3 thick, set in 0.08 x the width from the sides and the top, and ends 0.1 x the height above the bottom.
67	71	- Not modelled: the TO-220AC's and TO-220FP-2's cut-off middle lead, the TO-220's ejector dimple, the TO-247's copper ring ØP1, and the bodies' 5° draft and small radii.
68	72	- Every lead's shoulder narrows to the lead in one step.
69	73	- Materials are for looks and a rough mass:
70	74	- The mouldings are epoxy. Nylon (PA6) is the nearest material in the list.
71		- - The TO-220 tab, the TO-247 pad and the TO-126 plate are copper, and the leads are tinned copper.
	75	+ - The TO-220 and TO-262 tabs, the TO-247 pad and the TO-126 plate are copper, and the leads are tinned copper.
72	76	- The TO-18, TO-39 and TO-46 headers and leads are Kovar (8.36), so nickel (8.9), the nearest in the list. Their cans are steel.
73	77
74	78	## Catalogue models
		@@ -89,16 +93,20 @@
89	93	- **TO-220F-3_Vertical.** 10.16 wide, 4.70 thick, with the top part 2.54 thick, and 15.6 high. Leads 0.80 x 0.53 with 1.36 shoulders at 2.54. The leads' plane is 3.29 from the back, where Central's drawing gives 2.50–3.10 (0.19 over).
90	94	- **TO-220F-2_Vertical.** The same body, with leads at 0 and 5.08 (Central 5.10).
91	95
	96	+Added in 1.2.0:
	97	+
	98	+- **TO-262-3_Vertical.** 10.01 wide, 4.50 thick, the body 8.85 high, and the tab 1.37 above it, 1.27 thick. Leads 0.80 x 0.50 with 1.27 shoulders at 2.54. The leads' back face is 2.40 from the back. These are all within Vishay's drawing, except that the model's shoulders are about 3.15 long (L2 3.56–3.71) and its leads reach 10.5 below the body (L 13.46–14.10).
	99	+
92	100	The names name the JEDEC package, so they map to the maker's drawing of it, with the pitch and lead order as named, and the differences are listed here.
93	101
94	102	The reference models stand their bodies at different heights above the board: the TO-92 at 2.5, and the TO-18, TO-39 and TO-46 at about 5. The drawings don't give these, so this part uses the drawings' own seating.
95	103
96		-So these map: TO-220-3_Vertical (TO-220AB), TO-220-2_Vertical (TO-220AC), TO-247-3_Vertical (TO-247AC), TO-92 and TO-92_Inline (TO-92), TO-18-3 (TO-18), TO-18-2 (TO-18-2), TO-39-3 (TO-39), TO-46-3 (TO-46), TO-126-3_Vertical (TO-126), TO-220F-3_Vertical (TO-220F) and TO-220F-2_Vertical (TO-220F-2).
	104	+So these map: TO-220-3_Vertical (TO-220AB), TO-220-2_Vertical (TO-220AC), TO-247-3_Vertical (TO-247AC), TO-92 and TO-92_Inline (TO-92), TO-18-3 (TO-18), TO-18-2 (TO-18-2), TO-39-3 (TO-39), TO-46-3 (TO-46), TO-126-3_Vertical (TO-126), TO-220F-3_Vertical (TO-220F), TO-220F-2_Vertical (TO-220F-2) and TO-262-3_Vertical (TO-262).
97	105
98	106	These stay "no table read yet" (`COVERAGE.md`):
99	107
100	108	- the TO-92 models with leads formed to 2.54 (`_Wide`). TI's formed leads are 2.4 to 2.9 apart, with a land pattern of 2.6.
101	109	- the horizontal (bent-lead) models. The drawings give straight leads only.
102	110	- the 2-lead TO-39, TO-46 and TO-126 models. Central's TO-39, TO-46 and TO-126 sheets draw 3 leads only.
103		-- the other packages in the family: TO-218, TO-220-4/5/11, TO-247-2/4/5, TO-251, TO-262, TO-264, TO-3, TO-3P, TO-5, TO-8, TO-11 and TO-52, the TO-92 variants (L, S, Mini, Flat, 2-lead), and the windowed and lensed cans.
	111	+- the other packages in the family: TO-218, TO-220-4/5/11, TO-247-2/4/5, TO-251, TO-262-3-1EP and TO-262-5, TO-264, TO-3, TO-3P, TO-5, TO-8, TO-11 and TO-52, the TO-92 variants (L, S, Mini, Flat, 2-lead), and the windowed and lensed cans.
104	112