Is my AMS1117 regulator faulty or am I just dumb?

I connected 8.1V to the VIN on a nano and the AMS1117 went up in smoke. Any ideas as to what may have caused this?

By the way it got hot enough to desolder itself and multiple surrounding passive components.

EDIT - If it helps anyone, the smoke came out in a barely-noticeable trickle randomly interrupted by bursts of smoke.

What was connected to the Nano's pins?

L298N inputs on pins 3, 5, 6, and 11. Brushless ESC signal on pin 12. Ground connected to the ground on a buck converter, VIN connected to the OUT pin on a buck converter. Buck converter was turning 11.1V into about 8V. My measurement was 8.1 so that's what I put.

I know it's probably too late now but in the future if something like this happens don't move any wires. Just turn off the power and take a close up photo so we can see if anything is miswired.

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I got some help on Discord. Appears I had a defective regulator.

Was it counterfeit? Most individual semiconductors from eBay etc these days are fake, only buy from reputable electronics suppliers.

I hope you weren't trying to power big motors through a 1117, its only rated at 0.8A.

The Arduino, to my knowledge, was not powering anything. The board came in a 2 pack and I am powering its twin off a 9V with no issue.

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