# Help identifying chip **URL:** \ **Category:** Integrated Circuits (ICs)\ **Tags:** cross-reference, part-identification, power-management-pmic\ **Created:** [June 27, 2024, 2:51pm UTC](https://forum.digikey.com/t/help-identifying-chip/42655 "2024-06-27T14:51:38Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Nationalscale](https://avatars.discourse-cdn.com/v4/letter/n/eb9ed0/32.png) [@Nationalscale](https://forum.digikey.com/u/Nationalscale)\ **Post date:** [June 27, 2024, 2:51pm UTC](https://forum.digikey.com/t/help-identifying-chip/42655/1 "2024-06-27T14:51:38Z")
Trying to identify SMD part U5. It is a 16 pin VQFN with marking ALX on top and BAC on the bottom. This is a DC to DC converter 3mm X 3mm Add ![xgKjn](https://global.discourse-cdn.com/digikey/original/3X/f/f/ff213f24c7b1fc4274ed2e77684c95c19f1c76f5.jpeg) images ---
**Author:** ![Rob\_Johnson](https://avatars.discourse-cdn.com/v4/letter/r/a183cd/32.png) [@Rob\_Johnson](https://forum.digikey.com/u/Rob_Johnson)\ **Post date:** [June 27, 2024, 3:10pm UTC](https://forum.digikey.com/t/help-identifying-chip/42655/2 "2024-06-27T15:10:47Z")
Hello, welcome to the TechForum! Unfortunately, I was unable to find any information on this part for a possible alternative, do you have any information on the electrical specifications for it? ---
**Author:** ![Nationalscale](https://avatars.discourse-cdn.com/v4/letter/n/eb9ed0/32.png) [@Nationalscale](https://forum.digikey.com/u/Nationalscale)\ **Post date:** [June 27, 2024, 7:55pm UTC](https://forum.digikey.com/t/help-identifying-chip/42655/3 "2024-06-27T19:55:05Z")
Hi Rob, I only know that it is an adjustable regulator from 3v to 5v with a 12v input ---
**Author:** ![Nathan\_2268](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/nathan_2268/32/1883_2.png) [@Nathan\_2268](https://forum.digikey.com/u/Nathan_2268)\ **Post date:** [June 27, 2024, 10:44pm UTC](https://forum.digikey.com/t/help-identifying-chip/42655/4 "2024-06-27T22:44:29Z")
@Nationalscale I too was not able to verify the original item. The below link shows the options I had found for options that can handle the voltage spec you gave. [Voltage Regulators - DC DC Switching Regulators | Power Management (PMIC) | Electronic Components Distributor DigiKey](https://www.digikey.com/en/products/filter/power-management-pmic/voltage-regulators-dc-dc-switching-regulators/739?s=N4IgjCBcpgbFoDGUBmBDANgZwKYBoQB7KAbXAAYAOSgZkpALCsoBYBWBi6llkAXQIAHAC5QQAZWEAnAJYA7AOYgAvoxYAmAJwIQySOmz4ipLgHYNnMJtM1T5fkNGQJ0%2BUtXhNlbdF2pMuATEkGT2fB4AtOo6etIArkbBZBzhHtEhIABuAI4ocgAEUjgKcRhowoRSDiAcvoJQYEL1kEzkyspAA) ---
**Author:** ![Nationalscale](https://avatars.discourse-cdn.com/v4/letter/n/eb9ed0/32.png) [@Nationalscale](https://forum.digikey.com/u/Nationalscale)\ **Post date:** [June 28, 2024, 7:17pm UTC](https://forum.digikey.com/t/help-identifying-chip/42655/5 "2024-06-28T19:17:28Z")
Hi Nathan, Here is a partial schematic of the circuit. Maybe this will help [16 pin VQFN DC to DC converter.pdf](https://forum.digikey.com/uploads/short-url/kpysgkaVaMnCD4FjftsSEWPnXjs.pdf) (29.2 KB) ---
**Author:** ![Adam7](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/adam7/32/48093_2.png) [@Adam7](https://forum.digikey.com/u/Adam7)\ **Post date:** [July 2, 2024, 9:13am UTC](https://forum.digikey.com/t/help-identifying-chip/42655/6 "2024-07-02T09:13:13Z")
Where is this chip installed? Laptop, router, hub? Specify the model. ---
**Author:** ![chris\_groom](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/chris_groom/32/54044_2.png) [@chris\_groom](https://forum.digikey.com/u/chris_groom)\ **Post date:** [July 2, 2024, 1:09pm UTC](https://forum.digikey.com/t/help-identifying-chip/42655/7 "2024-07-02T13:09:46Z")
@Nationalscale Hi, I took a crack at this as well, and given your schematic its closest match in our stock would likely be one of the parts in the list I’ve linked here: [16-VQFN DC DC Regulators](https://www.digikey.com/short/54dfwdn8) I took a look at some of the datasheets and I wasn’t able to find a chip that’s going to be a direct replacement for the original from what I can tell. The main thing that I ran into was that these each seem to have a different pinout from yours based on the schematic you provided. At this point, I’d simply second Adam7’s question. ---
**Author:** ![Nationalscale](https://avatars.discourse-cdn.com/v4/letter/n/eb9ed0/32.png) [@Nationalscale](https://forum.digikey.com/u/Nationalscale)\ **Post date:** [July 2, 2024, 2:34pm UTC](https://forum.digikey.com/t/help-identifying-chip/42655/8 "2024-07-02T14:34:53Z")
Power supply section for weighing scale. ---
**Author:** ![Nationalscale](https://avatars.discourse-cdn.com/v4/letter/n/eb9ed0/32.png) [@Nationalscale](https://forum.digikey.com/u/Nationalscale)\ **Post date:** [July 2, 2024, 2:37pm UTC](https://forum.digikey.com/t/help-identifying-chip/42655/9 "2024-07-02T14:37:19Z")
Link did not work!