PCB Assembly Services - Screaming Circuits: Parts Substitution Issues


Parts Substitution Issues

A while back, we surveyed a number of you folks about various things that are important to you. One of the key concerns we heard about was a fear of an unapproved part substitution on a turn-key order. As a rule, when we are buying parts for a turn-key order, we do not make any substitutions without your authorization. We know this is important to you and we follow those wishes.

Schottky_top A related issue to that occurs on kitted jobs. We do sometimes get in parts that don't match the bill of materials exactly. On the one hand, we do know that on kitted jobs, you sent us the parts and it's your design. On the other hand, we also know that it's not difficult to accidentally grab the wrong bag of parts, especially if you have someone else kitting up the job for you.

We also know that there are plenty of times where there isn't any effective difference between a 10K, 1/4w resistor and a 12K, 1/8w resistor or between a 40V diode and a 36V diode. Of course, we also know that there are plenty of designs where those slight variations can be the difference between a 100pxthree_ic_circuit_chips great design and a non-functional pile of junk. And there are plenty of cases where a difference in suffix can indicate the same part but the wrong package.

If you know for certain that the substitution won't matter, the best thing to do is give us an updated bill of materials. The second best thing is to tell us in the order process that it's okay - like we describe in this post.

If we aren't sure what to do and have to call you, it can delay your job and we don't want that. We want to get your assembled boards to you when you want them.

Duane Benson
That's not me. It's my evil twin


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