u/Agrav_

https://preview.redd.it/1f6o7qqzmd0h1.jpg?width=1920&format=pjpg&auto=webp&s=7c8e5b714d65cde31f65487eb5e594d11c9d306e

The marking is: IB3HF
I measured the voltage on all the pins:

• pin1: 5V
• pin2: 0V
• pin3: 1.31V
• pin4: 2.8V
• pin5: 5V