Need help identifing component

[Dukenukemx]

This is for an ABS module for a Jeep Grand Cherokee that I as trying to repair a simple bad solder joint but I accidentally ripped off this component with my screw driver.

Digikey representative thinks it's a crystal or an oscillator with a frequency of 15.9MHz. They don't sell it either way. Can anyone confirm that it's a oscillator?

I also can't find a 15.9Mhz oscillator that has 4 feet and is SMD. Though 16Mhz are easy to find but not sure if 16Mhz is close enough.



It's feet underneath look like this.

[Jack Crow]

Re: Need help identifing component

Boss,
Items that control breaks are nothing I would want to fool with.
Spedo's, air conditioning panels, no problem. Nobody dies if they screw up down range.

Hard to test / prove if you get my drift.
Might be better to get a fresh module than take a guess.

Jack Crow

[Nick56]

Re: Need help identifing component

I'll second that, go with a whole new module.

Just for reference on other projects, SMD oscillators and some crystals both use 4 pins; one is basically a passive component while the other is powered and actively generates a signal. From seeing a few datasheets, there doesn't seem to be a reliable way to tell them apart by looking at them. What you could do is look at the board it was on, and follow the 4 traces (either by eye or with an ohm meter). With an oscillator, one pad will go to +5V and one will go to ground. Also they probably used 15.9 mhz for a good reason, I'd bet it's to get a specific baud rate for communication with another board in the car.

Again, that's for reference if you run into this situation on a less important board. I'd really advise against repairing this one, you might do exhaustive testing but still find out the hard way that the 16 mhz part in place of the 15.9 one causes the brakes to fail 1% of the time!

[trebo]

Re: Need help identifing component

daft question, if the original problem was only a bad solder joint, why cant the component be soldered back on???

[Dukenukemx]

Re: Need help identifing component

Just for reference on other projects, SMD oscillators and some crystals both use 4 pins; one is basically a passive component while the other is powered and actively generates a signal. From seeing a few datasheets, there doesn't seem to be a reliable way to tell them apart by looking at them. What you could do is look at the board it was on, and follow the 4 traces (either by eye or with an ohm meter). With an oscillator, one pad will go to +5V and one will go to ground. Also they probably used 15.9 mhz for a good reason, I'd bet it's to get a specific baud rate for communication with another board in the car.

Here's a photo of where the oscillator used to be. You can clearly see the paths. I don't know about oscillators but the four pads act like 2. So in reality I could probably stick a 2 pin oscillator. You can see it in the photo and I tested for continuity with a multi-meter.

I've found some 15.9Mhz oscillator's but I wanna confirm if that's really a 15.9Mhz oscillator?

Again, that's for reference if you run into this situation on a less important board. I'd really advise against repairing this one, you might do exhaustive testing but still find out the hard way that the 16 mhz part in place of the 15.9 one causes the brakes to fail 1% of the time!

The positive power pin to the board's solder joint was completely not functioning, so I doubt it would be a problem. The cost for a replacement module I would be better off junking the car. I'm not saying I going to stick a 16 Mhz in there for sure, but I wanted to know what are the repercussions of doing so. Does it make the chip run at slightly higher clock speed?

[Dukenukemx]

Re: Need help identifing component

daft question, if the original problem was only a bad solder joint, why cant the component be soldered back on???

I caused a new problem by accidentally sliding a screw drive and breaking a component.