---
page_id: wsd-top-metal-thickness-b5e78e75
type: context-page
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template_version: template-0.1.0
title: "Thread: Top Metal thickness"
slug: wsd-top-metal-thickness-b5e78e75
route: /evidence/i-information/questions/threads/top-metal-thickness
section: reference
access: public
summary: 10 Discord messages from ℹ️ - Information/⁉️-questions/threads/top-metal-thickness.md.
status: published
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tags: [discord, wafer-space, archive]
last_updated: 2026-08-19
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talk_route: /evidence/i-information/questions/threads/top-metal-thickness/talk
---

# Thread: Top Metal thickness

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

Messages: **10**

## message-1423053988210675852

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

- Message ID: `1423053988210675852`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1423053988210675852/1423053988210675852
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/top-metal-thickness/2025-10/2025-10.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/top-metal-thickness/2025-10/2025-10.json

**Content**

```text
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)**

- Message ID: `1423067312193404959`
- Author ID: `543162393413287956`
- Nickname: htamas
- User name: h.tamas
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1423053988210675852/1423067312193404959
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/top-metal-thickness/2025-10/2025-10.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/top-metal-thickness/2025-10/2025-10.json

**Content**

```text
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)**

- Message ID: `1423067907574726676`
- Author ID: `543162393413287956`
- Nickname: htamas
- User name: h.tamas
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1423053988210675852/1423067907574726676
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/top-metal-thickness/2025-10/2025-10.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/top-metal-thickness/2025-10/2025-10.json

**Content**

```text
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_)**

- Message ID: `1423076158219489300`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1423053988210675852/1423076158219489300
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/top-metal-thickness/2025-10/2025-10.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/top-metal-thickness/2025-10/2025-10.json

**Content**

```text
@Tim Edwards
```

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---

## message-1423076484469362820

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

- Message ID: `1423076484469362820`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1423053988210675852/1423076484469362820
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/top-metal-thickness/2025-10/2025-10.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/top-metal-thickness/2025-10/2025-10.json

**Content**

```text

```

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## message-1423076573749313630

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

- Message ID: `1423076573749313630`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1423053988210675852/1423076573749313630
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/top-metal-thickness/2025-10/2025-10.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/top-metal-thickness/2025-10/2025-10.json

**Content**

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

**Reactions**

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## message-1423076653290094675

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

- Message ID: `1423076653290094675`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1423053988210675852/1423076653290094675
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/top-metal-thickness/2025-10/2025-10.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/top-metal-thickness/2025-10/2025-10.json

**Content**

```text
> 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_)**

- Message ID: `1423076708701175890`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1423053988210675852/1423076708701175890
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/top-metal-thickness/2025-10/2025-10.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/top-metal-thickness/2025-10/2025-10.json

**Content**

```text
Guess that should be published somewhere.......
```

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## message-1423178688215777411

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

- Message ID: `1423178688215777411`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1423053988210675852/1423178688215777411
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/top-metal-thickness/2025-10/2025-10.json
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**Content**

```text
Thanks!
```

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## message-1423197422867447882

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

- Message ID: `1423197422867447882`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1423053988210675852/1423197422867447882
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/top-metal-thickness/2025-10/2025-10.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/top-metal-thickness/2025-10/2025-10.json

**Content**

```text
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".
```

**Reactions**

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