# Hey guys could i get a review - https://

Channel: #designreview
Source: https://discord.com/channels/1233487248129921135/1554691586196115497
Started: 2026-09-30T03:17:57.281000+00:00
Last activity: 2026-09-30T03:48:27.252000+00:00

## pixalynx — 2026-09-30T03:09:18.922000+00:00

Hey guys could i get a review - https://tscircuit.com/pixalynx/usb3-hub-10g#3d took about 8 hours on opus 5.5

## Seve — 2026-09-30T03:17:58.243000+00:00

looks pretty good to me! you have two variations of a usb-c port which is a bit weird

## Seve — 2026-09-30T03:18:07.898000+00:00

(why not use the same component for all of them?)

## pixalynx — 2026-09-30T03:41:13.937000+00:00

Idunno hahah maybe had to do with some power charging thing ? let me ask ai 😄

## pixalynx — 2026-09-30T03:41:46.365000+00:00

are you talking about the back ports or the front ports?

## Seve — 2026-09-30T03:42:16.566000+00:00

[attachment]
Attachment: CleanShot_2026-09-29_at_20.42.042x.png — https://community.tscircuit.com/media/1554699879471648798

## Seve — 2026-09-30T03:42:30.001000+00:00

usually people try not to have unique parts unless needed

## pixalynx — 2026-09-30T03:43:41.198000+00:00

waiting for claude's explanatation hahah

## pixalynx — 2026-09-30T03:45:22.134000+00:00

```It's deliberate. The board has two different USB-C receptacles because they do different jobs:

    J1 (host), J5, J6 (downstream)    J2 (power input)
Part    Amphenol 12401610E4#2A, 24 contacts    HRO TYPE-C-31-M-12, 16 contacts
Carries    10 Gbps SuperSpeed lanes, USB 2.0, CC, VBUS    VBUS, CC and D+/D− only
JLC price / stock (today)    $1.34 each, about 7k    $0.19 each, about 440k
J2 carries power and nothing else. The charger only needs VBUS, ground and the CC lines, which the HUSB238 uses to negotiate up to 20 V. D+/D− also go to the HUSB238. Nothing on that port carries SuperSpeed data, so a 24-contact 10 Gbps receptacle would have eight contacts wired to nothing.
The 16-contact part is cheaper, easier to source and smaller. It's about 7× cheaper and has about 60× the stock. It's narrower (about 8.9 mm body width against 10.5 mm) with fewer fine-pitch pads.
The three data ports are already one part. J1, J5 and J6 use the same connector and the same circuit block. The only difference is the HD3SS3220's role (upstream vs downstream), and J1's contacts are drawn on the other side of its schematic symbol so the drawing reads left to right.

Using the 24-contact part for J2 as well would mean one fewer unique part on the BOM. JLC charges a one-off loading fee for each unique "extended" part (typically $3). For 2–5 boards that roughly cancels out the extra $1.15 per connector, so it's close to break-even. It would also mean re-placing and re-routing the charger input at the back edge of an already routed and verified board. I'd leave it as is.```

## Seve — 2026-09-30T03:45:38.467000+00:00

hmm interesting

## pixalynx — 2026-09-30T03:45:47.262000+00:00

does that sound about right 😱  ?

## Seve — 2026-09-30T03:45:52.249000+00:00

yep

## pixalynx — 2026-09-30T03:45:57.673000+00:00

oh perfect 😄

## Seve — 2026-09-30T03:46:10.901000+00:00

so you just want to charge with this usb hub

## Seve — 2026-09-30T03:46:42.013000+00:00

J2 is used only for power

## pixalynx — 2026-09-30T03:46:53.083000+00:00

the front ports are for data

## Seve — 2026-09-30T03:46:58.071000+00:00

oh

## Seve — 2026-09-30T03:46:59.510000+00:00

i get it

## Seve — 2026-09-30T03:47:05.181000+00:00

J2 is for USB-PD power

## Seve — 2026-09-30T03:47:07.424000+00:00

yea i understand

## pixalynx — 2026-09-30T03:47:08.421000+00:00

yesss

## pixalynx — 2026-09-30T03:47:09.226000+00:00

😄

## Seve — 2026-09-30T03:47:10.893000+00:00

cool

## pixalynx — 2026-09-30T03:47:37.354000+00:00

recommend any changes? if not im gonna send this to fab 😛

## Seve — 2026-09-30T03:47:46.960000+00:00

i would ship it haha

## pixalynx — 2026-09-30T03:48:27.252000+00:00

wahoooo 😄