Cost for automatic diode testing ? 2

[TWEI]

Hi,

I would like to set up a system for automatic diode testing. As I know, the system should cover a tester and a handler at least. (If my understanding is wrong, please correct me.) Could any one tell me the estimated expense for setting up such a system? And who are the major suppliers in the field?

Best Regards,
Tiffany

 

[zeitghost]

What type of packages are the diodes in?

What are the currents and voltages you want to test to?

What type or types of diodes?

Just functional testing?

 

[TWEI]

Thanks for the response. It's so wonderful that some one hears you.

The tested device is Schottky Barrier Diode with surface mount package or power pack.

Basic DC parameters like forward voltage, breakdown voltage and leakege current should be tested. If I would like to test all the typical parameters shown on data sheet, what additional testing ability sohuld be added in?

In order to have the flexibility for testing various Shottky Barrier Diode, I would like to cover commercial available currents and voltages, as for testing ability.

 

[IRstuff]

I don't understand; if you are a supplier, you should already know what parameters are supposed to be tested.

If you are a user, the you should know what parameters are critical for your application. Then, again, if you are a user, why are you repeating tests that presumably have already been done at a lower cost? You are going to incur substantial cost in duplicate testing, maintenance of test hardware, validation and calibration of same and the cost of the body that runs the test hardware. I'm failing to see the payback, since it's usually substantially cheaper to have the supplier do this type of testing, particularly for tests they should already be doing..

TTFN

 

[TWEI]

Thanks for the comment from TTFN. It really bring much insight for me. Is it an universal rule that users typically do not test devices while receiving shipping from suppliers? Our first idea is if the cost is affordable, then we could consider to do something like this.

I am a new comer in this field. I appreciate your patience if I am asking some stupid questions.

 

[zeitghost]

I would assume that surface mount parts would come in tape and reel packaging.

This means that you have to extract the part from the existing packaging, test it, and then put it back into tape and reel for loading into the assembly machine.

I would think this is going to be expensive.

It's a long time since I worked in the semiconductor industry, but this sort of thing was not cheap 15 years ago, and I bet it's not much cheaper now!

 

[IRstuff]

As a general rule, users might typically do incoming inspection for shipping damage, etc. But any sort of handling at the user end unrelated to actual assembly generally damages more parts, both from possible ESD, the mechanical damage in the tester as well as electrical damage from the tester.

The only possible compelling reason for doing incoming electrical test is if you are screening for some sort of performance that is not specified by the supplier or the supplier's quality is poor. Even in the latter case, it's usually cheaper and more reliable to switch suppliers altogether than to try and catch poor quality at your end.

TTFN

 

[TWEI]

Thanks for the replies from Zeitghost and TTFN. They are very helpful and answering a lot of questions in my mind.

 

[nbucska]

To IRSTUFF
It may be cheaper to specify a better diode or get a better designer...

<nbucska@pcperipherals.com>