Author Topic: What is this SMD component?  (Read 1492 times)

0 Members and 1 Guest are viewing this topic.

Offline SaintGimp

  • Contributor
  • Posts: 17
What is this SMD component?
« on: April 13, 2017, 08:34:19 am »
Can anyone help me identify the component in the center of this photo, marked 033A?  I'm pretty sure it's blown and I'd like to replace it, but I don't know exactly what it is.  It's some sort of switching device, maybe a FET?  The top pin is the control pin.  The intended behavior seems to be that when the top pin has 3.8V, the two lower pins are not connected.  When the top pin has 1.4V, the lower left pin is connected to the lower right pin which is tied to ground.  Any ideas?  I've done Google searches every way I know how but haven't gotten any positive results yet.
« Last Edit: April 13, 2017, 08:41:39 am by SaintGimp »
 

Online helius

  • Super Contributor
  • ***
  • Posts: 3095
  • Country: us
Re: What is this SMD component?
« Reply #1 on: April 13, 2017, 08:41:37 am »
Searching for "Holtek 033A" returns useful results. HT7033A-1 is a "voltage detector".
tldr; if input is >3.3V, the output is disconnected (Hi-Z). When the input falls below 3.3V, the output is pulled to ground.
« Last Edit: April 13, 2017, 08:47:08 am by helius »
 
The following users thanked this post: SaintGimp

Offline TheAmmoniacal

  • Supporter
  • ****
  • Posts: 1159
  • Country: no
  • Cut me some slack, I'm a biochemist!
Re: What is this SMD component?
« Reply #2 on: April 13, 2017, 08:44:57 am »
I also need help identifying a part named "NMR1", all I can find is this: http://www.ic-smd.com/ssot23.asp?g=7800&s=NMR1 but it doesn't tell me much.
I collect [corporate] mugs.
MTBF ~ 700.000 h
 

Offline SaintGimp

  • Contributor
  • Posts: 17
Re: What is this SMD component?
« Reply #3 on: April 13, 2017, 08:46:29 am »
Searching for "Holtek 033A" returns useful results. HT7033A-1 is a "voltage detector".

Yes, that totally makes sense!  That's exactly what it is.  Thanks so much!  I didn't recognize the trademark which is why I couldn't find it myself.
 

Online ataradov

  • Super Contributor
  • ***
  • Posts: 6794
  • Country: us
    • Personal site
Re: What is this SMD component?
« Reply #4 on: April 13, 2017, 05:03:16 pm »
I didn't recognize the trademark which is why I couldn't find it myself.
You need this https://www.westfloridacomponents.com/manufacturer-logos.html
Alex
 
The following users thanked this post: JJalling, SaintGimp

Offline SaintGimp

  • Contributor
  • Posts: 17
 
The following users thanked this post: jct


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf