# SN74HCT245N voltage leak

**URL:** https://wled.discourse.group/t/sn74hct245n-voltage-leak/11743
**Category:** Hardware
**Created:** [April 30, 2024, 7:54am UTC](https://wled.discourse.group/t/sn74hct245n-voltage-leak/11743 "2024-04-30T07:54:18Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![lxkev](https://yyz2.discourse-cdn.com/free1/user_avatar/wled.discourse.group/lxkev/32/10064_2.png) [@lxkev](https://wled.discourse.group/u/lxkev)
#### Post date: [April 30, 2024, 7:54am UTC](https://wled.discourse.group/t/sn74hct245n-voltage-leak/11743/1 "2024-04-30T07:54:18Z")

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Hi all.

I have wt32 eth01 which has its own psu 5v.

It is hooked upto a SN74HCT245N

The pixels have there Own psu and is hooked it t the other psu… I have a led on the b side off the  
SN74HCT245N to show the secound psu is on.

Both psu G are linked.

However the led is lighting up when the secound psu isn’t on and I’m reading two volts on the b side of the SN74HCT245N…

SN74HCT245N specification say it has internal diodes so this doesn’t happen…

Thoughts?

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### Author: ![divsys](https://avatars.discourse-cdn.com/v4/letter/d/a3d4f5/32.png) [@divsys](https://wled.discourse.group/u/divsys)
#### Post date: [April 30, 2024, 11:46am UTC](https://wled.discourse.group/t/sn74hct245n-voltage-leak/11743/2 "2024-04-30T11:46:21Z")

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Post a drawing and/or pics of how you have this wired up.  
Something doesn’t sound correct…

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<div class="post-metadata">

### Author: ![lxkev](https://yyz2.discourse-cdn.com/free1/user_avatar/wled.discourse.group/lxkev/32/10064_2.png) [@lxkev](https://wled.discourse.group/u/lxkev)
#### Post date: [April 30, 2024, 10:33pm UTC](https://wled.discourse.group/t/sn74hct245n-voltage-leak/11743/3 "2024-04-30T22:33:21Z")

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I’ve found if I remove the eth01 the pixel power led does not illuminate.

 ![Schematic_board-2024v1_2024-05-01](https://global.discourse-cdn.com/free1/uploads/wled/original/2X/5/585f4bb95f2b891451ad8b97bbb768dec9a8bbcb.png)

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<div class="post-metadata">

### Author: ![lxkev](https://yyz2.discourse-cdn.com/free1/user_avatar/wled.discourse.group/lxkev/32/10064_2.png) [@lxkev](https://wled.discourse.group/u/lxkev)
#### Post date: [May 3, 2024, 9:24am UTC](https://wled.discourse.group/t/sn74hct245n-voltage-leak/11743/4 "2024-05-03T09:24:09Z")

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Worked out what i had done wrong. I thought one side of the chip need the esp voltage and the other the pixel.

this solved it [Help for installing SK6812 LED strip with ESP32 and WLED - #25 by Sebpaps](https://wled.discourse.group/t/help-for-installing-sk6812-led-strip-with-esp32-and-wled/10285/25?page=2)