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Leaded disc varistors, TDK SIOV StandarD series S05, S07, S10, S14 and S20, every voltage class from 11 V to 1100 V.

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part.py 203 lines · Python · STEVE runtime · checked
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1"""Leaded disc varistor (metal oxide varistor), TDK SIOV StandarD series S05 to S20: an epoxy-coated zinc oxide disc standing on two straight
2radial leads. Lead 1 at the origin, lead 2 at +X by the lead spacing e and at -Y by the lead offset a (the leads are fixed to the disc's two
3faces); the leads go straight down through the board. Dimensions from TDK's data sheet, listed in the README."""
4from steve import Model
5
6size = "S10" # SIOV size class (disc diameter class)
7voltage = 275 # Voltage class, the K number in the type name (rated RMS voltage; K1000 is rated 1100 V)
8tail = 3.0 # mm Leads below the board
9detail = "full" # full: disc and leads; simple: the disc only
10
11# TDK Electronics, "SIOV metal oxide varistors, Leaded varistors, StandarD series", B722*, March 2018
12# (www.tdk-electronics.tdk.com/inf/70/db/var/SIOV_Leaded_StandarD.pdf), pages 14 to 18, table "Dimensions" (with the type names from the
13# ordering-code tables): (ordering code, VRMS in V, lead spacing e +/-1, lead offset a typical, disc diameter w max, thickness th max,
14# height over the seating plane h max, lead diameter d +/-0.05), lengths in mm. Page 14's "Dimensional drawings" (VAR0408-C-E) shows the
15# shape: the leads leave the disc 3 max above the seating plane (IEC 60717).
16TYPES = {
17 "S05K11": ("B72205S0110K101", 11, 5.0, 1.2, 7.0, 3.3, 8.5, 0.6),
18 "S07K11": ("B72207S0110K101", 11, 5.0, 1.2, 9.0, 3.4, 11.0, 0.6),
19 "S10K11": ("B72210S0110K101", 11, 7.5, 1.4, 12.0, 4.0, 14.5, 0.8),
20 "S14K11": ("B72214S0110K101", 11, 7.5, 1.4, 15.5, 4.0, 18.5, 0.8),
21 "S20K11": ("B72220S0110K101", 11, 10.0, 1.5, 21.5, 4.5, 25.5, 1.0),
22 "S05K14": ("B72205S0140K101", 14, 5.0, 1.3, 7.0, 3.4, 8.5, 0.6),
23 "S07K14": ("B72207S0140K101", 14, 5.0, 1.3, 9.0, 3.5, 11.0, 0.6),
24 "S10K14": ("B72210S0140K101", 14, 7.5, 1.5, 12.0, 4.2, 14.5, 0.8),
25 "S14K14": ("B72214S0140K101", 14, 7.5, 1.5, 15.5, 4.2, 18.5, 0.8),
26 "S20K14": ("B72220S0140K101", 14, 10.0, 1.6, 21.5, 4.6, 25.5, 1.0),
27 "S05K17": ("B72205S0170K101", 17, 5.0, 1.4, 7.0, 3.5, 8.5, 0.6),
28 "S07K17": ("B72207S0170K101", 17, 5.0, 1.4, 9.0, 3.6, 11.0, 0.6),
29 "S10K17": ("B72210S0170K101", 17, 7.5, 1.6, 12.0, 4.4, 14.5, 0.8),
30 "S14K17": ("B72214S0170K101", 17, 7.5, 1.7, 15.5, 4.4, 18.5, 0.8),
31 "S20K17": ("B72220S0170K101", 17, 10.0, 1.8, 21.5, 4.8, 25.5, 1.0),
32 "S05K20": ("B72205S0200K101", 20, 5.0, 1.2, 7.0, 3.5, 8.5, 0.6),
33 "S07K20": ("B72207S0200K101", 20, 5.0, 1.2, 9.0, 3.6, 11.0, 0.6),
34 "S10K20": ("B72210S0200K101", 20, 7.5, 1.6, 12.0, 4.5, 14.5, 0.8),
35 "S14K20": ("B72214S0200K101", 20, 7.5, 1.6, 15.5, 4.6, 18.5, 0.8),
36 "S20K20": ("B72220S0200K101", 20, 10.0, 2.1, 21.5, 5.1, 25.5, 1.0),
37 "S05K25": ("B72205S0250K101", 25, 5.0, 1.3, 7.0, 3.6, 8.5, 0.6),
38 "S07K25": ("B72207S0250K101", 25, 5.0, 1.3, 9.0, 3.7, 11.0, 0.6),
39 "S10K25": ("B72210S0250K101", 25, 7.5, 1.4, 12.0, 4.2, 14.5, 0.8),
40 "S14K25": ("B72214S0250K101", 25, 7.5, 1.4, 15.5, 4.2, 18.5, 0.8),
41 "S20K25": ("B72220S0250K101", 25, 10.0, 1.8, 21.5, 4.7, 25.5, 1.0),
42 "S05K30": ("B72205S0300K101", 30, 5.0, 1.5, 7.0, 3.6, 8.5, 0.6),
43 "S07K30": ("B72207S0300K101", 30, 5.0, 1.5, 9.0, 3.7, 11.0, 0.6),
44 "S10K30": ("B72210S0300K101", 30, 7.5, 1.5, 12.0, 4.4, 14.5, 0.8),
45 "S14K30": ("B72214S0300K101", 30, 7.5, 1.5, 15.5, 4.4, 18.5, 0.8),
46 "S20K30": ("B72220S0300K101", 30, 10.0, 2.0, 21.5, 4.9, 25.5, 1.0),
47 "S05K35": ("B72205S0350K101", 35, 5.0, 1.6, 7.0, 3.7, 8.5, 0.6),
48 "S07K35": ("B72207S0350K101", 35, 5.0, 1.6, 9.0, 3.9, 11.0, 0.6),
49 "S10K35": ("B72210S0350K101", 35, 7.5, 1.6, 12.0, 4.4, 14.5, 0.8),
50 "S14K35": ("B72214S0350K101", 35, 7.5, 1.6, 15.5, 4.5, 18.5, 0.8),
51 "S20K35": ("B72220S0350K101", 35, 10.0, 2.2, 21.5, 5.1, 25.5, 1.0),
52 "S05K40": ("B72205S0400K101", 40, 5.0, 1.8, 7.0, 3.9, 8.5, 0.6),
53 "S07K40": ("B72207S0400K101", 40, 5.0, 1.8, 9.0, 4.1, 11.0, 0.6),
54 "S10K40": ("B72210S0400K101", 40, 7.5, 1.7, 12.0, 4.8, 14.5, 0.8),
55 "S14K40": ("B72214S0400K101", 40, 7.5, 1.7, 15.5, 4.9, 18.5, 0.8),
56 "S20K40": ("B72220S0400K101", 40, 10.0, 2.4, 21.5, 5.4, 25.5, 1.0),
57 "S05K50": ("B72205S0500K101", 50, 5.0, 1.3, 7.0, 3.3, 8.5, 0.6),
58 "S07K50": ("B72207S0500K101", 50, 5.0, 1.3, 9.0, 3.3, 11.0, 0.6),
59 "S10K50": ("B72210S0500K101", 50, 7.5, 1.4, 12.0, 3.9, 14.5, 0.8),
60 "S14K50": ("B72214S0500K101", 50, 7.5, 1.4, 15.5, 3.9, 18.5, 0.8),
61 "S20K50": ("B72220S0500K101", 50, 10.0, 1.6, 21.5, 4.3, 25.5, 1.0),
62 "S05K60": ("B72205S0600K101", 60, 5.0, 1.4, 7.0, 3.3, 8.5, 0.6),
63 "S07K60": ("B72207S0600K101", 60, 5.0, 1.4, 9.0, 3.3, 11.0, 0.6),
64 "S10K60": ("B72210S0600K101", 60, 7.5, 1.4, 12.0, 4.0, 14.5, 0.8),
65 "S14K60": ("B72214S0600K101", 60, 7.5, 1.5, 15.5, 4.0, 18.5, 0.8),
66 "S20K60": ("B72220S0600K101", 60, 10.0, 1.7, 21.5, 4.4, 25.5, 1.0),
67 "S05K75": ("B72205S0750K101", 75, 5.0, 1.5, 7.0, 3.4, 8.5, 0.6),
68 "S07K75": ("B72207S0750K101", 75, 5.0, 1.5, 9.0, 3.6, 11.0, 0.6),
69 "S10K75": ("B72210S0750K101", 75, 7.5, 1.5, 12.0, 4.2, 14.5, 0.8),
70 "S14K75": ("B72214S0750K101", 75, 7.5, 1.5, 15.5, 4.2, 18.5, 0.8),
71 "S20K75": ("B72220S0750K101", 75, 10.0, 1.8, 21.5, 4.6, 25.5, 1.0),
72 "S05K95": ("B72205S0950K101", 95, 5.0, 1.5, 7.0, 3.4, 8.5, 0.6),
73 "S07K95": ("B72207S0950K101", 95, 5.0, 1.5, 9.0, 3.4, 11.0, 0.6),
74 "S10K95": ("B72210S0950K101", 95, 7.5, 1.5, 12.0, 4.0, 14.5, 0.8),
75 "S14K95": ("B72214S0950K101", 95, 7.5, 1.5, 15.5, 4.0, 18.5, 0.8),
76 "S20K95": ("B72220S0950K101", 95, 10.0, 1.8, 21.5, 4.5, 25.5, 1.0),
77 "S05K115": ("B72205S0111K101", 115, 5.0, 1.5, 7.0, 3.6, 8.5, 0.6),
78 "S07K115": ("B72207S0111K101", 115, 5.0, 1.5, 9.0, 3.6, 11.0, 0.6),
79 "S10K115": ("B72210S0111K101", 115, 7.5, 1.6, 12.0, 4.2, 14.5, 0.8),
80 "S14K115": ("B72214S0111K101", 115, 7.5, 1.7, 15.5, 4.2, 18.5, 0.8),
81 "S20K115": ("B72220S0111K101", 115, 10.0, 1.9, 21.5, 4.6, 25.5, 1.0),
82 "S05K130": ("B72205S0131K101", 130, 5.0, 1.6, 7.0, 3.6, 8.5, 0.6),
83 "S07K130": ("B72207S0131K101", 130, 5.0, 1.6, 9.0, 3.6, 11.0, 0.6),
84 "S10K130": ("B72210S0131K101", 130, 7.5, 1.8, 12.0, 4.2, 14.5, 0.8),
85 "S14K130": ("B72214S0131K101", 130, 7.5, 1.9, 15.5, 4.2, 18.5, 0.8),
86 "S20K130": ("B72220S0131K101", 130, 10.0, 2.0, 21.5, 4.7, 25.5, 1.0),
87 "S05K140": ("B72205S0141K101", 140, 5.0, 1.7, 7.0, 3.7, 8.5, 0.6),
88 "S07K140": ("B72207S0141K101", 140, 5.0, 1.7, 9.0, 3.7, 11.0, 0.6),
89 "S10K140": ("B72210S0141K101", 140, 7.5, 1.9, 12.0, 4.3, 14.5, 0.8),
90 "S14K140": ("B72214S0141K101", 140, 7.5, 2.0, 15.5, 4.3, 18.5, 0.8),
91 "S20K140": ("B72220S0141K101", 140, 10.0, 2.1, 21.5, 4.8, 25.5, 1.0),
92 "S05K150": ("B72205S0151K101", 150, 5.0, 1.8, 7.0, 3.8, 8.5, 0.6),
93 "S07K150": ("B72207S0151K101", 150, 5.0, 1.8, 9.0, 3.8, 11.0, 0.6),
94 "S10K150": ("B72210S0151K101", 150, 7.5, 2.0, 12.0, 4.4, 14.5, 0.8),
95 "S14K150": ("B72214S0151K101", 150, 7.5, 2.1, 15.5, 4.4, 18.5, 0.8),
96 "S20K150": ("B72220S0151K101", 150, 10.0, 2.2, 21.5, 4.9, 25.5, 1.0),
97 "S05K175": ("B72205S0171K101", 175, 5.0, 2.0, 7.0, 3.9, 8.5, 0.6),
98 "S07K175": ("B72207S0171K101", 175, 5.0, 2.0, 9.0, 4.0, 11.0, 0.6),
99 "S10K175": ("B72210S0171K101", 175, 7.5, 2.2, 12.0, 4.6, 14.5, 0.8),
100 "S14K175": ("B72214S0171K101", 175, 7.5, 2.2, 15.5, 4.6, 18.5, 0.8),
101 "S20K175": ("B72220S0171K101", 175, 10.0, 2.3, 21.5, 5.0, 25.5, 1.0),
102 "S05K230": ("B72205S0231K101", 230, 5.0, 1.5, 7.0, 4.0, 8.5, 0.6),
103 "S07K230": ("B72207S0231K101", 230, 5.0, 1.5, 9.0, 4.0, 11.0, 0.6),
104 "S10K230": ("B72210S0231K101", 230, 7.5, 1.7, 12.0, 4.7, 14.5, 0.8),
105 "S14K230": ("B72214S0231K101", 230, 7.5, 1.7, 15.5, 4.7, 18.5, 0.8),
106 "S20K230": ("B72220S0231K101", 230, 10.0, 1.8, 21.5, 5.1, 25.5, 1.0),
107 "S05K250": ("B72205S0251K101", 250, 5.0, 1.5, 7.0, 4.2, 8.5, 0.6),
108 "S07K250": ("B72207S0251K101", 250, 5.0, 1.5, 9.0, 4.2, 11.0, 0.6),
109 "S10K250": ("B72210S0251K101", 250, 7.5, 1.7, 12.0, 4.8, 14.5, 0.8),
110 "S14K250": ("B72214S0251K101", 250, 7.5, 1.7, 15.5, 4.8, 18.5, 0.8),
111 "S20K250": ("B72220S0251K101", 250, 10.0, 1.9, 21.5, 5.3, 25.5, 1.0),
112 "S05K275": ("B72205S0271K101", 275, 5.0, 1.6, 7.0, 4.3, 8.5, 0.6),
113 "S07K275": ("B72207S0271K101", 275, 5.0, 1.6, 9.0, 4.4, 11.0, 0.6),
114 "S10K275": ("B72210S0271K101", 275, 7.5, 1.8, 12.0, 5.0, 14.5, 0.8),
115 "S14K275": ("B72214S0271K101", 275, 7.5, 1.8, 15.5, 5.0, 18.5, 0.8),
116 "S20K275": ("B72220S0271K101", 275, 10.0, 2.0, 21.5, 5.4, 25.5, 1.0),
117 "S05K300": ("B72205S0301K101", 300, 5.0, 1.7, 7.0, 4.5, 8.5, 0.6),
118 "S07K300": ("B72207S0301K101", 300, 5.0, 1.7, 9.0, 4.5, 11.0, 0.6),
119 "S10K300": ("B72210S0301K101", 300, 7.5, 1.9, 12.0, 5.1, 14.5, 0.8),
120 "S14K300": ("B72214S0301K101", 300, 7.5, 1.9, 15.5, 5.2, 18.5, 0.8),
121 "S20K300": ("B72220S0301K101", 300, 10.0, 2.1, 21.5, 5.6, 25.5, 1.0),
122 "S05K320": ("B72205S0321K101", 320, 5.0, 1.9, 7.0, 4.8, 9.0, 0.6),
123 "S07K320": ("B72207S0321K101", 320, 5.0, 1.9, 9.0, 4.8, 11.5, 0.6),
124 "S10K320": ("B72210S0321K101", 320, 7.5, 2.1, 12.0, 5.4, 15.0, 0.8),
125 "S14K320": ("B72214S0321K101", 320, 7.5, 2.1, 15.5, 5.4, 19.0, 0.8),
126 "S20K320": ("B72220S0321K101", 320, 10.0, 2.3, 21.5, 5.8, 25.5, 1.0),
127 "S05K350": ("B72205S0351K101", 350, 5.0, 2.0, 7.0, 4.9, 9.0, 0.6),
128 "S07K350": ("B72207S0351K101", 350, 5.0, 2.0, 9.0, 4.9, 11.5, 0.6),
129 "S10K350": ("B72210S0351K101", 350, 7.5, 2.2, 12.0, 5.6, 15.0, 0.8),
130 "S14K350": ("B72214S0351K101", 350, 7.5, 2.2, 15.5, 5.6, 19.0, 0.8),
131 "S20K350": ("B72220S0351K101", 350, 10.0, 2.4, 21.5, 6.0, 25.5, 1.0),
132 "S05K385": ("B72205S0381K101", 385, 5.0, 2.1, 7.0, 5.1, 9.0, 0.6),
133 "S07K385": ("B72207S0381K101", 385, 5.0, 2.1, 9.0, 5.2, 11.5, 0.6),
134 "S10K385": ("B72210S0381K101", 385, 7.5, 2.4, 12.0, 5.8, 15.0, 0.8),
135 "S14K385": ("B72214S0381K101", 385, 7.5, 2.4, 15.5, 5.9, 19.0, 0.8),
136 "S20K385": ("B72220S0381K101", 385, 10.0, 2.5, 21.5, 6.3, 26.0, 1.0),
137 "S05K420": ("B72205S0421K101", 420, 5.0, 2.4, 7.0, 5.4, 9.0, 0.6),
138 "S07K420": ("B72207S0421K101", 420, 5.0, 2.4, 9.0, 5.4, 11.5, 0.6),
139 "S10K420": ("B72210S0421K101", 420, 7.5, 2.6, 12.0, 6.1, 15.0, 0.8),
140 "S14K420": ("B72214S0421K101", 420, 7.5, 2.6, 15.5, 6.1, 19.0, 0.8),
141 "S20K420": ("B72220S0421K101", 420, 10.0, 2.7, 21.5, 6.5, 26.0, 1.0),
142 "S05K440": ("B72205S0441K101", 440, 5.0, 2.4, 7.0, 5.5, 9.0, 0.6),
143 "S07K440": ("B72207S0441K101", 440, 5.0, 2.4, 9.0, 5.5, 11.5, 0.6),
144 "S10K440": ("B72210S0441K101", 440, 7.5, 2.7, 12.0, 6.2, 15.0, 0.8),
145 "S14K440": ("B72214S0441K101", 440, 7.5, 2.7, 15.5, 6.3, 19.0, 0.8),
146 "S20K440": ("B72220S0441K101", 440, 10.0, 2.8, 21.5, 6.7, 26.0, 1.0),
147 "S05K460": ("B72205S0461K101", 460, 5.0, 2.6, 7.0, 5.7, 9.0, 0.6),
148 "S07K460": ("B72207S0461K101", 460, 5.0, 2.6, 9.0, 5.7, 11.5, 0.6),
149 "S10K460": ("B72210S0461K101", 460, 7.5, 2.8, 12.0, 6.3, 15.0, 0.8),
150 "S14K460": ("B72214S0461K101", 460, 7.5, 2.8, 15.5, 6.4, 19.0, 0.8),
151 "S20K460": ("B72220S0461K101", 460, 10.0, 3.0, 21.5, 6.8, 26.0, 1.0),
152 "S10K510": ("B72210S0511K101", 510, 7.5, 3.1, 12.0, 6.7, 15.0, 0.8),
153 "S14K510": ("B72214S0511K101", 510, 7.5, 3.1, 15.5, 6.8, 19.0, 0.8),
154 "S20K510": ("B72220S0511K101", 510, 10.0, 3.2, 21.5, 7.1, 26.0, 1.0),
155 "S10K550": ("B72210S0551K101", 550, 7.5, 3.4, 12.0, 7.1, 15.0, 0.8),
156 "S14K550": ("B72214S0551K101", 550, 7.5, 3.4, 15.5, 7.2, 19.0, 0.8),
157 "S20K550": ("B72220S0551K101", 550, 10.0, 3.6, 21.5, 7.5, 26.0, 1.0),
158 "S10K625": ("B72210S0621K101", 625, 7.5, 3.7, 12.0, 7.5, 15.0, 0.8),
159 "S14K625": ("B72214S0621K101", 625, 7.5, 3.7, 15.5, 7.5, 19.0, 0.8),
160 "S20K625": ("B72220S0621K101", 625, 10.0, 3.9, 21.5, 7.9, 26.0, 1.0),
161 "S10K680": ("B72210S0681K101", 680, 7.5, 4.1, 12.0, 7.9, 15.0, 0.8),
162 "S14K680": ("B72214S0681K101", 680, 7.5, 4.1, 15.5, 8.0, 19.0, 0.8),
163 "S20K680": ("B72220S0681K101", 680, 10.0, 4.2, 21.5, 8.4, 26.0, 1.0),
164 "S14K1000": ("B72214S0102K101", 1100, 7.5, 6.3, 15.5, 11.0, 20.5, 0.8),
165 "S20K1000": ("B72220S0102K101", 1100, 10.0, 6.4, 21.5, 11.4, 28.5, 1.0),
166}
167# Proportions, for looks: the disc's rim is rounded with a radius of 0.4 x the thickness, at most 0.1 x the diameter; the disc's top is at h, so its underside sits
168# h - w above the board; each lead runs from its end up into the disc's underside.
169
170siov = f"{size}K{voltage}"
171if siov not in TYPES:
172 raise ValueError(f"no type {siov!r}: {', '.join(TYPES)}")
173_code, vrms, e, a, w, th, h, d = TYPES[siov]
174R = w / 2
175cx, cy = e / 2, -a / 2
176cz = h - R
177rim = min(0.4 * th, 0.1 * w)
178import math
179model = Model()
180# The disc: revolve a half-section (radius along X, thickness along Y) about the disc's axis, which runs along Y through (cx, cz).
181model.plane("disc_plane", on="XY", offset=cz, name="Disc section")
182with model.sketch("disc_sketch", on="disc_plane", name="Disc") as sk:
183 arc = [(rim * math.sin(math.pi / 2 * k / 6), rim * (1 - math.cos(math.pi / 2 * k / 6))) for k in range(7)]
184 lower = [(cx + R - rim + u, cy - th / 2 + v) for u, v in arc]
185 upper = [(cx + R - rim + u, cy + th / 2 - v) for u, v in reversed(arc)]
186 sk.polyline("disc_outline", [(cx, cy - th / 2), *lower, *upper, (cx, cy + th / 2)], closed=True)
187model.revolve("disc", "disc_sketch", axis=((cx, cy, cz), (0, 1, 0)), op="new", body="disc_body", name="Disc")
188bodies = ["disc_body"]
189if detail == "full":
190 top = cz - math.sqrt(R * R - (e / 2) ** 2) # where the disc's underside is over each lead
191 model.plane("leads_start", on="XY", offset=-tail, name="Lead ends")
192 for i, (x, y) in enumerate(((0.0, 0.0), (e, -a)), 1):
193 with model.sketch(f"lead_{i}_section", on="leads_start", name=f"Lead {i}") as sk:
194 sk.circle(f"lead_{i}_round", (x, y), d / 2)
195 model.extrude(f"lead_{i}", f"lead_{i}_section", distance=tail + top, op="new", body=f"lead_{i}_body", name=f"Lead {i}")
196 bodies.append(f"lead_{i}_body")
197# Materials, for looks and a rough mass: the disc is zinc oxide ceramic (density about 5.6) under a thin epoxy coat; titanium nitride, the
198# ceramic in the material list nearest in density (5.2), stands in for it, in SIOV's blue. The leads are tinned copper.
199model.material("titanium-nitride", bodies=["disc_body"], color="#2f5fa6")
200if detail == "full":
201 model.material("copper", bodies=bodies[1:], color="#c9ccd1")
202result = model.result()
203

Leaded metal oxide disc varistor standing on the board: TDK SIOV StandarD series, from TDK's dimension table for each type (disc diameter and thickness, height, lead spacing, lead offset and lead diameter). Lead 1 at the origin, lead 2 along +X and offset along -Y. See the README.

Disc varistor

A leaded metal oxide disc varistor standing on the board: TDK's SIOV StandarD series. The disc stands upright on two straight leads. Lead 1 is at the origin, lead 2 is at +X by the lead spacing e and at -Y by the lead offset a, because the leads are fixed to the disc's two faces. The leads go straight down through the board.

The type names the disc size and the voltage class, so S10K275 is a 10 mm class disc for 275 V RMS. The part takes them as size (S10) and voltage (275). Every type in TDK's dimension table is offered, 149 in all: S05 and S07 from 11 to 460 V, S10 to 680 V, S14 and S20 to 1100 V.

Size class Disc Ø w max Lead spacing e Lead Ø d Height h max Thickness th max
S05 7.0 5.0 0.6 8.5 to 9.0 3.3 to 5.7, by voltage
S07 9.0 5.0 0.6 11.0 to 11.5 3.3 to 5.7, by voltage
S10 12.0 7.5 0.8 14.5 to 15.0 3.9 to 7.9, by voltage
S14 15.5 7.5 0.8 18.5 to 20.5 3.9 to 11.0, by voltage
S20 21.5 10.0 1.0 25.5 to 28.5 4.3 to 11.4, by voltage

part.py holds the whole table, type by type, with the ordering code (B722...) for each.

Source

TDK Electronics, "SIOV metal oxide varistors, Leaded varistors, StandarD series", B722*, March 2018, from TDK's own site: https://www.tdk-electronics.tdk.com/inf/70/db/var/SIOV_Leaded_StandarD.pdf.

  • Pages 14 to 18, table "Dimensions": for each ordering code, the lead spacing e ±1, the lead offset a (typical), the disc diameter w max, the thickness th max, the height over the seating plane h max, the lead length l min and the lead diameter d ±0.05. The ordering-code tables on pages 2 to 13 give each code's type name (S14K1000 and S20K1000 are rated 1100 V RMS, as the sheet's footnote says).
  • Page 14, "Dimensional drawings" (VAR0408-C-E): the disc upright on two leads, the leads a apart in the bottom view, and the seating plane (IEC 60717) at most 3 below the disc.

Proportions, for looks only. The drawing shows these but doesn't dimension them:

  • The disc's rim is rounded with a radius of 0.4 x the thickness, at most 0.1 x the diameter.
  • The disc's top is at h max, so its underside is h - w above the board. Each lead runs from its end up into the disc's underside. The coating that runs down the leads (3 max) isn't modelled.
  • The leads end 3.0 below the board by default (tail). The sheet's lead length, 25 min, is for the loose part before it's cut.
  • Materials are for looks and a rough mass. The disc is zinc oxide ceramic (density about 5.6) under a thin epoxy coat. Titanium nitride, the ceramic in the material list nearest in density (5.2), stands in for it, in SIOV's blue. The leads are tinned copper, so copper.

Catalogue models

The catalogue's RV_Disc_D<w>mm_W<th>mm_P<e>mm models name a disc diameter, thickness and lead spacing but no maker. Each one whose three values are a row of TDK's table maps to that size, to the lowest-voltage SIOV type that has it. The types that share a size differ only in the typical lead offset a. 97 of the 100 models map. Measured on three reference models (D7 W3.4 P5, D12 W4.2 P7.5, D21.5 W5.1 P10): the disc's diameter, thickness and lead spacing are the named ones. Their leads are Ø 0.54, 0.72 and 0.9, where TDK gives 0.6, 0.8 and 1.0, and this part uses TDK's leads. The discs sit on the board, where TDK's h max puts the disc's top at w + 1.5 to w + 7.

Three models name a size that isn't in the StandarD table, so they're left out until another table is read (COVERAGE.md): D16.5 W6.7 P7.5, D21.5 W6.1 P7.5 and D9 W6.1 P5.

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