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Thread: Top Metal thickness

10 Discord messages from ℹ️ - Information/⁉️-questions/threads/top-metal-thickness.md.

Category: ℹ️ - Information Parent channel: #⁉️-questions Thread ID: 1423053988210675852

Messages: 10

message-1423053988210675852

2025-10-01T21:08:29.854+00:00 — tnt (@246tnt)

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What's the top metal layer thickness in `gf180mcuD` ? I though this was the `Top metal (30kA)` but looking at the tech lef, it doesn't seem to match any of the available option.
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message-1423067312193404959

2025-10-01T22:01:26.539+00:00 — htamas (@h.tamas)

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From https://github.com/RTimothyEdwards/open_pdks/blob/master/gf180mcu/NOTES:
"February 14, 2023:  Added PDK variant gf180mcuD, which is like gf180mcuC except has a top metal thickness of 1.1um instead of 0.9um.  According to GF, this is preferred for better wire bonding yield on the pads.  The first open MPW was done with gf180mcuC, but all subsequent open MPWs will be done with gf180mcuD."
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message-1423067907574726676

2025-10-01T22:03:48.489+00:00 — htamas (@h.tamas)

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See also https://github.com/RTimothyEdwards/open_pdks/blob/master/gf180mcu/Makefile.in#L60-L63 and the text above it
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message-1423076158219489300

2025-10-01T22:36:35.596+00:00 — Tim 'mithro' Ansell (@mithro_)

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@Tim Edwards
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message-1423076484469362820

2025-10-01T22:37:53.38+00:00 — Tim 'mithro' Ansell (@mithro_)

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message-1423076573749313630

2025-10-01T22:38:14.666+00:00 — Tim 'mithro' Ansell (@mithro_)

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> We are using the B option @ https://gf180mcu-pdk.readthedocs.io/en/latest/analog/layout/inter_specs/inter_specs_3_43.html

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message-1423076653290094675

2025-10-01T22:38:33.63+00:00 — Tim 'mithro' Ansell (@mithro_)

Content

> 1.1um (a.k.a. 11 kiloAngstroms).
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message-1423076708701175890

2025-10-01T22:38:46.841+00:00 — Tim 'mithro' Ansell (@mithro_)

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Guess that should be published somewhere.......
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message-1423178688215777411

2025-10-02T05:24:00.652+00:00 — tnt (@246tnt)

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Thanks!
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message-1423197422867447882

2025-10-02T06:38:27.341+00:00 — tnt (@246tnt)

Content

A bit unfortunate that it's the "B" option because MiM won't be available in TT  (user don't have access to the top metal layer, so they can't contact the top plate), but "c'est la vie".

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