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steve/ceramic-chip-capacitor

Multilayer ceramic chip capacitors (MLCC), EIA 0201 to 3640, with KEMET's case dimensions and chip thickness codes.

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part.py 78 lines · Python · STEVE runtime · checked
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1"""Multilayer ceramic chip capacitor (MLCC) by EIA case size and KEMET chip thickness code: the ceramic body with a metal termination
2capping each end. Centred on the origin, seated on the XY plane, the length L (between the terminations) along X and the width W along Y.
3Dimensions from KEMET's C0G data sheets, listed in the README."""
4from steve import Model
5
6size = "0805" # EIA case size (inch code)
7thickness = "DG" # KEMET chip thickness code (the part number's thickness, set by the capacitance and voltage)
8
9# Each entry: (length L, width W, termination band B), nominal, in mm.
10# KEMET "Surface Mount Multilayer Ceramic Chip Capacitors (SMD MLCCs), C0G Dielectric, 10 - 250 VDC (Commercial Grade)", C1003_C0G,
11# 8/21/2023 (copy hosted by Chip and Dip, static.chipdip.ru/lib/841/DOC042841891.pdf), page 2, "Dimensions - Millimeters (Inches)":
12# 0201 to 2225.
13# KEMET "... High Voltage C0G Dielectric, 500 - 10,000 VDC (Commercial Grade)", C1009_C0G_HV_SMD, 8/18/2023 (copy hosted by Chip and Dip,
14# static.chipdip.ru/lib/036/DOC043036585.pdf), page 2, "Dimensions - Millimeters (Inches)": 3640.
15CASES = {
16 "0201": (0.60, 0.30, 0.15),
17 "0402": (1.00, 0.50, 0.30),
18 "0603": (1.60, 0.80, 0.35),
19 "0805": (2.00, 1.25, 0.50),
20 "1206": (3.20, 1.60, 0.50),
21 "1210": (3.20, 2.50, 0.50),
22 "1805": (4.50, 1.27, 0.60),
23 "1808": (4.70, 2.00, 0.60),
24 "1812": (4.50, 3.20, 0.60),
25 "1825": (4.50, 6.40, 0.60),
26 "2220": (5.70, 5.00, 0.60),
27 "2225": (5.60, 6.40, 0.60),
28 "3640": (9.10, 10.20, 1.27),
29}
30# Thickness code: (case size, chip thickness T nominal), mm.
31# C1003_C0G page 10, "Table 2A - Chip Thickness/Tape & Reel Packaging Quantities" (0201 to 2225); C1009_C0G_HV_SMD, "Table 2A" (3640).
32THICKNESS = {
33 "AB": ("0201", 0.30),
34 "BB": ("0402", 0.50), "BD": ("0402", 0.55),
35 "CF": ("0603", 0.80), "CG": ("0603", 0.80), "CH": ("0603", 0.85),
36 "DM": ("0805", 0.70), "DN": ("0805", 0.78), "DP": ("0805", 0.90), "DE": ("0805", 1.00), "DF": ("0805", 1.10), "DG": ("0805", 1.25),
37 "EB": ("1206", 0.78), "EC": ("1206", 0.90), "ED": ("1206", 1.00), "EE": ("1206", 1.10), "EF": ("1206", 1.20), "EH": ("1206", 1.60),
38 "FB": ("1210", 0.78), "FC": ("1210", 0.90), "FE": ("1210", 1.00), "FF": ("1210", 1.10), "FG": ("1210", 1.25), "FH": ("1210", 1.55),
39 "FM": ("1210", 1.70), "FJ": ("1210", 1.85), "FK": ("1210", 2.10),
40 "NC": ("1805", 1.00),
41 "LF": ("1808", 1.00),
42 "GB": ("1812", 1.00), "GD": ("1812", 1.25), "GH": ("1812", 1.40), "GG": ("1812", 1.55), "GK": ("1812", 1.60), "GJ": ("1812", 1.70),
43 "GN": ("1812", 1.70), "GM": ("1812", 2.00),
44 "HB": ("1825", 1.10), "HE": ("1825", 1.40), "HG": ("1825", 1.60),
45 "JB": ("2220", 1.00), "JD": ("2220", 1.30), "JE": ("2220", 1.40), "JF": ("2220", 1.50), "JG": ("2220", 1.70), "JL": ("2220", 2.00),
46 "KE": ("2225", 1.40),
47 "MA": ("3640", 1.40), "MB": ("3640", 2.00), "MC": ("3640", 2.50),
48}
49# Proportions, for looks (the drawing shows the terminations as caps over the body's ends but doesn't dimension their thickness): each
50# termination is a cap 0.05 x T thick, over the ceramic body's end and, for the band B, its four sides.
51CAP = 0.05
52
53if size not in CASES:
54 raise ValueError(f"no case size {size!r}: {', '.join(CASES)}")
55if thickness not in THICKNESS or THICKNESS[thickness][0] != size:
56 raise ValueError(f"no thickness code {thickness!r} for case size {size}: "
57 f"{', '.join(k for k, v in THICKNESS.items() if v[0] == size)}")
58L, W, B = CASES[size]
59T = THICKNESS[thickness][1]
60c = CAP * T
61
62model = Model()
63model.plane("body_plane", on="XY", offset=c, name="Body")
64with model.sketch("body_sketch", on="body_plane", name="Ceramic body") as sk:
65 sk.rect("body_rect", (-L / 2 + c, -W / 2 + c), (L / 2 - c, W / 2 - c))
66model.extrude("body", "body_sketch", distance=T - 2 * c, op="new", body="body_body", name="Ceramic body")
67for side, sx in (("left", -1), ("right", 1)):
68 with model.sketch(f"{side}_sketch", on="XY", name=f"Termination {side}") as sk:
69 sk.rect(f"{side}_rect", (sx * (L / 2 - B), -W / 2), (sx * L / 2, W / 2))
70 model.extrude(f"{side}_cap", f"{side}_sketch", distance=T, op="new", body=f"{side}_body", name=f"Termination {side}")
71 model.extrude(f"{side}_hollow", "body_sketch", distance=T - 2 * c, op="cut", body=f"{side}_body", name=f"Termination {side} hollow")
72# Materials, for looks and a rough mass: the body is ceramic dielectric with nickel electrodes (density about 5 to 6); titanium nitride, the
73# ceramic in the material list nearest in density (5.2), stands in for it, in the body's tan. The terminations are copper or nickel under
74# matte tin ("C = 100% Matte Sn", the part number's termination finish), shown as tin.
75model.material("titanium-nitride", bodies=["body_body"], color="#b89a6e")
76model.material("tin", bodies=["left_body", "right_body"], color="#c9ccd1")
77result = model.result()
78

Multilayer ceramic chip capacitor for board layouts: the ceramic body with a tin-finished termination capping each end, from KEMET's C0G data sheets. Case sizes 0201, 0402, 0603, 0805, 1206, 1210, 1805, 1808, 1812, 1825, 2220, 2225 and 3640 (length, width and termination band from KEMET's dimension table), each with the chip thicknesses KEMET makes it in (the thickness code in the part number). Length along X. See the README.

Ceramic chip capacitor

A multilayer ceramic chip capacitor (MLCC): the ceramic body with a metal termination capping each end. The part is centred on the origin and seated on the XY plane, with the length L, between the terminations, along X and the width W along Y. Each termination covers its end and runs the band B back along the four sides.

size is the EIA case size (inch code). thickness is KEMET's chip thickness code, the part number's thickness, which the capacitance and voltage set. Every case size and thickness code in KEMET's two C0G tables is offered. Each preset is a case size with the thickness code nearest the old catalogue model's height (see below).

Case size Metric Length L Width W Band B Thickness codes: T
0201 0603 0.60 ±0.03 0.30 ±0.03 0.15 ±0.05 AB 0.30
0402 1005 1.00 ±0.05 0.50 ±0.05 0.30 ±0.10 BB 0.50, BD 0.55
0603 1608 1.60 ±0.15 0.80 ±0.15 0.35 ±0.15 CF 0.80, CG 0.80, CH 0.85
0805 2012 2.00 ±0.20 1.25 ±0.20 0.50 ±0.25 DM 0.70, DN 0.78, DP 0.90, DE 1.00, DF 1.10, DG 1.25
1206 3216 3.20 ±0.20 1.60 ±0.20 0.50 ±0.25 EB 0.78, EC 0.90, ED 1.00, EE 1.10, EF 1.20, EH 1.60
1210 3225 3.20 ±0.20 2.50 ±0.20 0.50 ±0.25 FB 0.78, FC 0.90, FE 1.00, FF 1.10, FG 1.25, FH 1.55, FM 1.70, FJ 1.85, FK 2.10
1805 4513 4.50 ±0.50 1.27 ±0.38 0.60 ±0.35 NC 1.00
1808 4520 4.70 ±0.50 2.00 ±0.20 0.60 ±0.35 LF 1.00
1812 4532 4.50 ±0.30 3.20 ±0.30 0.60 ±0.35 GB 1.00, GD 1.25, GH 1.40, GG 1.55, GK 1.60, GJ 1.70, GN 1.70, GM 2.00
1825 4564 4.50 ±0.30 6.40 ±0.40 0.60 ±0.35 HB 1.10, HE 1.40, HG 1.60
2220 5650 5.70 ±0.40 5.00 ±0.40 0.60 ±0.35 JB 1.00, JD 1.30, JE 1.40, JF 1.50, JG 1.70, JL 2.00
2225 5664 5.60 ±0.40 6.40 ±0.40 0.60 ±0.35 KE 1.40
3640 9210 9.10 ±0.40 10.20 ±0.40 1.27 ±0.40 MA 1.40, MB 2.00, MC 2.50

The metric codes are KEMET's. The model uses the nominal values.

Source

KEMET's data sheets, from copies hosted by the distributor Chip and Dip, because KEMET's own file server didn't answer:

  • KEMET, "Surface Mount Multilayer Ceramic Chip Capacitors (SMD MLCCs), C0G Dielectric, 10 – 250 VDC (Commercial Grade)", C1003_C0G, 8/21/2023, https://static.chipdip.ru/lib/841/DOC042841891.pdf. Page 2, "Dimensions – Millimeters (Inches)": L, W, B and the separation for 0201 to 2225. Page 10, "Table 2A – Chip Thickness/Tape & Reel Packaging Quantities": the thickness codes and their thicknesses.
  • KEMET, "Surface Mount Multilayer Ceramic Chip Capacitors (SMD MLCCs), High Voltage C0G Dielectric, 500 – 10,000 VDC (Commercial Grade)", C1009_C0G_HV_SMD, 8/18/2023, https://static.chipdip.ru/lib/036/DOC043036585.pdf. Page 2, "Dimensions – Millimeters (Inches)": 3640. "Table 2A": its thickness codes MA, MB and MC.

Proportions, for looks only. The drawing shows the terminations as caps over the body's ends but doesn't dimension their thickness. Each termination here is a cap 0.05 x T thick, over the ceramic body's end and, for the band B, over its four sides, so the body between the terminations is 0.05 x T in from the terminations' faces.

Materials are for looks and a rough mass. The body is ceramic dielectric with nickel electrodes, density about 5 to 6. Titanium nitride, the ceramic in the material list nearest in density (5.2), stands in for it, in the body's tan. The terminations are copper or nickel under matte tin (the part number's "C = 100% Matte Sn"), shown as tin. The sheets give no weight, so there is no mass check.

Catalogue models

The old catalogue's C_<inch>_<metric>Metric models are plain blocks of the case's length and width, with no terminations. Each maps to KEMET's chip of that case size where KEMET's length and width are the model's within 0.05 mm. Measured on the reference models (length x width x height):

Model Measured KEMET L x W Preset thickness
C_0201_0603Metric 0.6 x 0.3 x 0.3 0.60 x 0.30 AB 0.30
C_0402_1005Metric 1.0 x 0.5 x 0.5 1.00 x 0.50 BB 0.50
C_0603_1608Metric 1.6 x 0.8 x 0.8 1.60 x 0.80 CF 0.80
C_0805_2012Metric 2.0 x 1.24 x 1.25 2.00 x 1.25 DG 1.25
C_1206_3216Metric 3.2 x 1.6 x 1.6 3.20 x 1.60 EH 1.60
C_1210_3225Metric 3.2 x 2.5 x 2.5 3.20 x 2.50 FK 2.10
C_1812_4532Metric 4.5 x 3.2 x 2.5 4.50 x 3.20 GM 2.00
C_1825_4564Metric 4.5 x 6.4 x 2.5 4.50 x 6.40 HG 1.60
C_2220_5750Metric 5.7 x 5.0 x 2.9 5.70 x 5.00 JL 2.00
C_2225_5664Metric 5.6 x 6.4 x 3.4 5.60 x 6.40 KE 1.40
C_3640_9110Metric 9.14 x 10.2 x 2.54 9.10 x 10.20 MC 2.50

The heights of the old models are the case's width or more, often thicker than any chip KEMET makes in that size, so the preset takes KEMET's thickness code nearest that height.

Not mapped, because no KEMET case has their length and width: C_01005_0402Metric (0.4 x 0.2), C_1806_4516Metric (4.5 x 1.6; KEMET has 1805, 4.50 x 1.27), C_1808_4520Metric (4.5 x 2.0; KEMET's 1808 is 4.70 long), C_2010_5025Metric (5.0 x 2.5), C_2220_5650Metric (5.6 x 5.0; KEMET's 2220 is 5.70 x 5.00), C_2512_6332Metric (6.3 x 3.2) and C_2816_7142Metric (7.1 x 4.2).

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