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Identify this Surface Mount Component

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Rofflesaur:
On today's episode of Name this Component:

What the heck is this?



I'm troubleshooting an RF receiver for an automotive RF keyless entry module. While checking various components on the board, I came across that. It looked like a fuse, so I tested continuity and there was none. It's so far on the back of the board and nowhere near where power enters, so what would a fuse be doing there? It appears to have the number 4.0 on it, and the area of the PCB where it sat was labeled "X1." Here's a pic of that...



Edit: This board is from 1997, so it may not be something that's used in modern designs.

Mark:
Xtal

Rofflesaur:

--- Quote from: Mark on September 26, 2019, 05:07:53 am ---Xtal

--- End quote ---

In a glass MELF package? Is that a thing? Lol.

DaJMasta:
Looks like it is, X is a crystal designation and it's got the load caps on either terminal, so I'd assume it's a 4MHz crystal.

Rofflesaur:
I think you guys are correct. I didn't even know such a thing existed! I connected it back to the vehicle and probed the component with my DVM (don't have a portable scope). I very briefly saw 3.98Mhz before it crashed from the additional loading. I suppose I'll post in the RF sub forum tomorrow, as this is out of my area of expertise. Thanks.

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