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steve/tantalum-chip-capacitor

Moulded tantalum chip capacitors in KYOCERA AVX TAJ case sizes A to Y, standard and low profile, from AVX's TAJ data sheet.

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part.py 77 lines · Python · STEVE runtime · checked
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1"""Moulded tantalum chip capacitor, KYOCERA AVX TAJ case sizes, standard (A, B, C, D, E, U, V) and low profile (F, H, K, P, R, S, T, W, X,
2Y). Centred on the origin with the board on the XY plane and the length along X: the moulded body, the polarity band on top at the anode
3(-X) end, and a J-lead termination at each end that runs up the end face and under the body (each its own solid). Dimensions from AVX's
4TAJ data sheet; see the README."""
5from steve import Model
6
7case = "A" # AVX case code
8
9# case: (EIA code, EIA metric code, profile, L, W, H, W1, A, S min.) in mm, the nominal values of AVX's tables.
10# AVX "TAJ Series, Standard and Low Profile Tantalum Capacitors", catalogue issue 070417, page 6, "STANDARD CASE DIMENSIONS" and "LOW
11# PROFILE CASE DIMENSIONS: millimeters (inches)". L is +/- 0.20, W +0.20 / -0.10, H +0.20 / -0.10 (standard; low profile: H max.), W1
12# +/- 0.20 (P and R: 1.00 +/- 0.10), A +0.30 / -0.20. "W1 dimension applies to the termination width for A dimensional area only."
13CASES = {
14 "A": ("1206", "3216-18", "standard", 3.20, 1.60, 1.60, 1.20, 0.80, 1.10),
15 "B": ("1210", "3528-21", "standard", 3.50, 2.80, 1.90, 2.20, 0.80, 1.40),
16 "C": ("2312", "6032-28", "standard", 6.00, 3.20, 2.60, 2.20, 1.30, 2.90),
17 "D": ("2917", "7343-31", "standard", 7.30, 4.30, 2.90, 2.40, 1.30, 4.40),
18 "E": ("2917", "7343-43", "standard", 7.30, 4.30, 4.10, 2.40, 1.30, 4.40),
19 "U": ("2924", "7361-43", "standard", 7.30, 6.10, 4.10, 3.10, 1.30, 4.40),
20 "V": ("2924", "7361-38", "standard", 7.30, 6.10, 3.55, 3.10, 1.30, 4.40),
21 "F": ("2312", "6032-20", "low", 6.00, 3.20, 2.00, 2.20, 1.30, 2.90),
22 "H": ("1210", "3528-15", "low", 3.50, 2.80, 1.50, 2.20, 0.80, 1.40),
23 "K": ("1206", "3216-10", "low", 3.20, 1.60, 1.00, 1.20, 0.80, 1.10),
24 "P": ("0805", "2012-15", "low", 2.05, 1.35, 1.50, 1.00, 0.50, 0.85),
25 "R": ("0805", "2012-12", "low", 2.05, 1.30, 1.20, 1.00, 0.50, 0.85),
26 "S": ("1206", "3216-12", "low", 3.20, 1.60, 1.20, 1.20, 0.80, 1.10),
27 "T": ("1210", "3528-12", "low", 3.50, 2.80, 1.20, 2.20, 0.80, 1.40),
28 "W": ("2312", "6032-15", "low", 6.00, 3.20, 1.50, 2.20, 1.30, 2.90),
29 "X": ("2917", "7343-15", "low", 7.30, 4.30, 1.50, 2.40, 1.30, 4.40),
30 "Y": ("2917", "7343-20", "low", 7.30, 4.30, 2.00, 2.40, 1.30, 4.40),
31}
32# The middle of each tolerance band: W and A are 0.05 over nominal (+0.20 / -0.10, +0.30 / -0.20), and so is a standard case's H; a low
33# profile case's H is its maximum, the only value given.
34W_MID = 0.05
35H_MID = 0.05
36A_MID = 0.05
37# Proportions, for looks (the drawing shows these but don't dimension them): the termination's metal is LEAD thick; it covers the end face
38# up to UP of the height, outside the moulding (which is 2 x LEAD shorter than L), and lies in a recess under it for A from the end. The
39# polarity band is BAND_W of the length wide and BAND_IN of it in from the anode end; it stands BAND_T proud of the moulding, whose top is
40# BAND_T under H.
41LEAD = 0.1
42UP = 0.5
43BAND_W = 0.15
44BAND_IN = 0.05
45BAND_T = 0.03
46
47eia, metric, profile, L, W, H, W1, A, S_MIN = CASES[case]
48width, length_a = W + W_MID, A + A_MID
49height = H + H_MID if profile == "standard" else H
50model = Model()
51model.box("body", L - 2 * LEAD, width, height - BAND_T, at=(0, 0, (height - BAND_T) / 2), op="new", body="body_body", name="Body")
52leads = []
53for tag, side in (("anode", -1), ("cathode", 1)):
54 end = side * L / 2
55 inner, wall = end - side * length_a, end - side * LEAD
56 # The termination's side section (x, z): up the end face to UP x height, and along the bottom A in from the end.
57 section = [(end, 0.0), (end, UP * height), (wall, UP * height), (wall, LEAD), (inner, LEAD), (inner, 0.0)]
58 # The XZ plane's normal is -Y: offset -W1 / 2 puts it on the termination's +Y side, and the extrusion runs across it to -Y.
59 model.plane(f"{tag}_plane", on="XZ", offset=-W1 / 2, name="Terminations")
60 with model.sketch(f"{tag}_sketch", on=f"{tag}_plane", name="Terminations") as sk:
61 sk.polyline(f"{tag}_section", section, closed=True)
62 model.extrude(f"{tag}_lead", f"{tag}_sketch", distance=W1, op="new", body=f"{tag}_body", name="Terminations")
63 # The recess under the moulding for the termination's foot, so that no solids overlap.
64 with model.sketch(f"{tag}_room_sketch", on=f"{tag}_plane", name="Room for the terminations") as sk:
65 sk.rect(f"{tag}_room", (min(inner, wall), 0.0), (max(inner, wall), LEAD))
66 model.extrude(f"{tag}_room", f"{tag}_room_sketch", distance=W1, op="cut", body="body_body", name="Room for the terminations")
67 leads.append(f"{tag}_body")
68band_x = -L / 2 + (BAND_IN + BAND_W / 2) * L
69model.box("band", BAND_W * L, width, BAND_T, at=(band_x, 0, height - BAND_T / 2), op="new", body="band_body", name="Polarity band")
70# Materials, for looks and a rough mass: the moulded case is epoxy compound, mostly silica filler (density about 1.9 to 2.0), ptfe (2.07)
71# the nearest in the material list, in AVX's orange; the terminations are a tin-plated ("Sn Plating (standard)") lead frame, copper; the
72# band is marking ink, shown in ptfe.
73model.material("ptfe", bodies=["body_body"], color="#e8a33a")
74model.material("ptfe", bodies=["band_body"], color="#8a4a22")
75model.material("copper", bodies=leads, color="#c9ccd1")
76result = model.result()
77

Surface-mount moulded tantalum capacitors for board layouts and enclosures: the moulded case, the polarity band at the anode end and two J-lead terminations, each its own solid. Every case size of AVX's TAJ series: standard A, B, C, D, E, U and V, and low profile F, H, K, P, R, S, T, W, X and Y, by EIA size. Dimensions from AVX's data sheet. See the README.

Tantalum chip capacitor

Moulded tantalum chip capacitors in KYOCERA AVX's TAJ case sizes: standard A, B, C, D, E, U and V, and low profile F, H, K, P, R, S, T, W, X and Y. The capacitor is centred on the origin with the board on the XY plane and its length along X. It is the moulded case, the polarity band on top at the anode (+, -X) end, and a J-lead termination at each end. Each termination runs up the end face and under the case, and is its own solid.

Source

AVX, "TAJ Series, Standard and Low Profile Tantalum Capacitors", catalogue issue 070417, page 6, "STANDARD CASE DIMENSIONS" and "LOW PROFILE CASE DIMENSIONS: millimeters (inches)". Copy hosted by Chip and Dip, https://static.chipdip.ru/lib/821/DOC012821570.pdf.

Case EIA EIA metric L W H W1 A S min.
A 1206 3216-18 3.20 1.60 1.60 1.20 0.80 1.10
B 1210 3528-21 3.50 2.80 1.90 2.20 0.80 1.40
C 2312 6032-28 6.00 3.20 2.60 2.20 1.30 2.90
D 2917 7343-31 7.30 4.30 2.90 2.40 1.30 4.40
E 2917 7343-43 7.30 4.30 4.10 2.40 1.30 4.40
U 2924 7361-43 7.30 6.10 4.10 3.10 1.30 4.40
V 2924 7361-38 7.30 6.10 3.55 3.10 1.30 4.40
F 2312 6032-20 6.00 3.20 2.00 max. 2.20 1.30 2.90
H 1210 3528-15 3.50 2.80 1.50 max. 2.20 0.80 1.40
K 1206 3216-10 3.20 1.60 1.00 max. 1.20 0.80 1.10
P 0805 2012-15 2.05 1.35 1.50 max. 1.00 ± 0.10 0.50 0.85
R 0805 2012-12 2.05 1.30 1.20 max. 1.00 ± 0.10 0.50 0.85
S 1206 3216-12 3.20 1.60 1.20 max. 1.20 0.80 1.10
T 1210 3528-12 3.50 2.80 1.20 max. 2.20 0.80 1.40
W 2312 6032-15 6.00 3.20 1.50 max. 2.20 1.30 2.90
X 2917 7343-15 7.30 4.30 1.50 max. 2.40 1.30 4.40
Y 2917 7343-20 7.30 4.30 2.00 max. 2.40 1.30 4.40

The tolerances: L ± 0.20, W + 0.20 / - 0.10, H + 0.20 / - 0.10 (standard cases), W1 ± 0.20 (P and R: ± 0.10), A + 0.30 / - 0.20. L is the length, W the width and H the height. W1 is the termination's width, and A its length under the case from the end. S is the smallest gap between the terminations. The table notes: "W1 dimension applies to the termination width for A dimensional area only."

The model uses the middle of each tolerance band. W and A are 0.05 over nominal, and so is a standard case's H. A low profile case's H is its maximum, the only value given.

Proportions, stated plainly. The drawing shows these but doesn't dimension them:

  • The termination's metal is 0.1 thick. It covers the end face up to half the height, W1 wide there too, outside the moulding. The moulding is 0.2 shorter than L, so the length over the terminations is L. Under the case, the foot lies in a recess A long.
  • The polarity band is 0.15 of the length wide and 0.05 of it in from the anode end. It stands 0.03 proud of the moulding, whose top is 0.03 under H.
  • The case is a plain block; the moulding's draft isn't modelled.

Materials. The moulded case is epoxy compound, mostly silica filler (density about 1.9 to 2.0), and ptfe (2.07) is the nearest in the material list. It is shown in AVX's orange. The terminations are a tin-plated lead frame ("Sn Plating (standard)"), shown as copper. The tantalum anode inside isn't modelled, so the model is much lighter than the part. The page gives no weight.

Catalogue models

The old catalogue's CP_EIA-<metric>_<maker>-<case> entries each name an EIA case size, with AVX's or KEMET's case letter. The mapping is by the EIA case code, not by the letter: makers give the same EIA case different letters (EIA 7343-15 is KEMET's W and AVX's X), so a KEMET-named entry maps to AVX's case of the same EIA code. Their reference models are single solids. Each was measured (overall length x width x height) and compared with AVX's case of the same EIA metric code. An entry maps when its length and width are within 0.05 of AVX's nominal, and its height is within 0.05 of AVX's nominal or maximum height. The EIA code's last figure is the maximum height.

Entry Reference model AVX case
CP_EIA-2012-15_AVX-P 2.05 x 1.35 x 1.5 P
CP_EIA-3216-18_Kemet-A 3.2 x 1.6 x 1.8 A (H max. 1.80)
CP_EIA-3528-15_AVX-H 3.5 x 2.8 x 1.5 H
CP_EIA-6032-20_AVX-F 6.0 x 3.2 x 2.0 F
CP_EIA-6032-28_Kemet-C 6.0 x 3.2 x 2.8 C (H max. 2.80)
CP_EIA-7343-15_Kemet-W 7.3 x 4.3 x 1.5 X
CP_EIA-7343-31_Kemet-D 7.3 x 4.3 x 3.1 D (H max. 3.10)
CP_EIA-7361-38_AVX-V 7.3 x 6.1 x 3.55 V
CP_EIA-7361-438_AVX-U 7.3 x 6.1 x 4.1 U

Left out, with the measured differences:

Entry Reference model AVX's case of that EIA code
CP_EIA-2012-12_Kemet-R 2.0 x 1.2 x 1.2 R: 2.05 x 1.30 x 1.2 max. (width 0.10 off)
CP_EIA-3216-10_Kemet-I 3.4 x 1.8 x 1.2 K: 3.20 x 1.60 x 1.0 max.
CP_EIA-3216-12_Kemet-S 3.4 x 1.8 x 1.2 S: 3.20 x 1.60 x 1.2 max.
CP_EIA-3528-12_Kemet-T 3.7 x 3.0 x 1.2 T: 3.50 x 2.80 x 1.2 max.
CP_EIA-6032-15_Kemet-U 6.3 x 3.5 x 1.5 W: 6.00 x 3.20 x 1.5 max.
CP_EIA-7343-20_Kemet-V 7.5 x 4.6 x 2.0 Y: 7.30 x 4.30 x 2.0 max.
CP_EIA-7343-43_Kemet-X 7.6 x 4.6 x 4.3 E: 7.30 x 4.30 x 4.10

CP_EIA-1608-08_AVX-J, CP_EIA-1608-10_AVX-L, CP_EIA-7343-30_AVX-N, CP_EIA-7343-40_Kemet-Y and CP_EIA-7360-38_Kemet-E have no case in AVX's TAJ table, so no table has been read for them yet.

Changed in 1.0.1: the README says plainly that entries map by EIA case code, and that makers give the same case different letters. The model is unchanged.

  1. 1.0.1 Latest Compare with 1.0.0
  2. 1.0.0
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